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RabbitMQ 关闭、开启消费

君之言之 06-21 09:30 阅读 1

第一章  SpringBoot开发入门

1.Springboot的优点。

① 可快速构建独立的Spring应用。

② 直接嵌入Tomcat、Jetty和Undertow服务器(无须部署WAR文件)

③ 通过依赖启动器简化构建配置

④ 自动化配置Spring和第三方库

⑤ 提供生产就绪功能

⑥ 极少的代码生成和XML配置

2.Lombok开发工具的常用注解,要求会在项目中使用Lombok

@Data这个注解是@Getter、@Setter、@ToString、@EqualsAndHashCode等注解的集合。它会自动生成getter和setter方法、toString()方法、equals()方法和hashCode()方法。

@NoArgsConstructor、@AllArgsConstructor和@RequiredArgsConstructor:这三个注解分别用于生成无参构造器、包含所有参数的构造器和包含特定参数的构造器。这有助于在Java类中提供灵活的构造器选项

3.SpringBoot项目的常用注解

① @SpringBootApplication 是 Spring Boot 的核心注解,用于标记该类为主程序启动类

② @RestController 是一个组合注解,等同于@Controller和@ResponseBody两个注解结合使用的结果。

③ @Controller 注解用于标识一个 Java 类是一个控制器。控制器负责接收请求、处理请求,并返回响应,如ThymeLeaf中的html页面模版

④ @GetMapping 主要作用是设置方法的访问路径并限定其访问方式为Get。如在hello方法上添加@GetMapping(“/hello”)注解,则该方法的请求处理路径为”/hello”

4.SpringBoot项目的常用项目构建工具

① Maven,其核心配置文件是pom.xml

② Gradle ,其核心配置文件是 build.gradle

5.利用SpringBoot进行单元测试的步骤?

  1. 在pom文件添加Spring-boot-starter-test测试启动器
  2. 编写单元测试类
  3. 编写单元测试方法

第二章 SpringBoot核心配置与注解

1.全局配置文件

application.properties配置文件

案例:通过配置文件给实体类赋值

1、创建两个Bean类,Pet类和Person类

//Person类
public class Person {
    private int id;
    private String firstName;
    private List hobby;
    private Map map;
    private String email;
}

//Pet类
public class Pet {
    private int id;
    private String name;
}

2、application.properties配置文件设置对象值

person.id = 1
person.name = 张三
person.hobby = [唱,跳,rap]
person.map.k1 = v12
person.map.k2 = v2
person.pet.id=1
person.pet.name = zs

3、将Person交给IOC容器管理

@Data注解为添加getter/setter方法

@Component注解为Bean并交给IOC管理

@ConfigurationProperties(prefix = "person")将配置文件中person前缀的属性注入到该类

@Data
@Component
@ConfigurationProperties(prefix = "person")
public class Person {
...
}

4、测试类中注入Person测试

@RunWith(SpringRunner.class) //测试运行器,并加载Spring Boot测试注解
@SpringBootTest //标记单元测试类
class Unit2ApplicationTests {

    @Autowired //依赖注入
    private Person person;

    @Test //注解为测试方法
    void contextLoads() {
        System.out.println(person.toString());
    }
}

application.yaml配置文件

yaml配置格式

person:
  id: 2
  firstname: 李四
  hobby: [chang, tiao, rap]
  map: {k3:v3, k4:v4}
  email: 11skdjafk@qq.com
  pet: {id: 1, name: lisi}

1、vlaue为普通数据类型,注意冒号后面有空格

server: 
    port: 8081

2、value值为数组和单列集合。缩紧式写法有两种

第一种 -(空格)
hobby: 
    - play
    - raad
    - sleep

第二种逗号分隔
hobby: 
    play,
    raad,
    sleep

行内写法,[]可以省略

hobby: [play,raad,sleep]

3.value值为Map集合,使用{}

map: {k3:v3, k4:v4}

缩进法

person:
    map: 
        k1:v1
        k2:v2

配置文件属性值的注入

@ConfigurationProperties(prefix = "xxx")

@Value("${xxx.xx}")注入配置文件属性值

@Value("#{5*2}") 使用SpEL表达式直接给属性注入值

两种注解对比分析

对比点@ConfigurationProperties@Value
底层框架SpringBootSpring
功能批量注入配置文件中的属性单个注入
setter方法需要不需要
复杂类型属性注入支持不支持
松散绑定支持不支持
JSR303数据校验支持不支持
SpEL表达式不支持支持

松散绑定

例如Bean有一个属性firstName,properties中可以有以下几种写法

JSR303数据校验

对注入的值做是否符合相关值的规则,如是否符合email格式

在pom中添加依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>   
@Component
@ConfigurationProperties(prefix = "person")
@Validated  //引入Spring框架支持的数据校验规则
public class Person {
    @Email  //对属性进行规则匹配
    private String email;

}

自定义配置文件

使用@PropertySource加载配置文件

案例:

1.在resource目录创建一个自定义配置文件test.properties

test.id=10
test.name=zhangsan

2.自定义配置类MyProperties


@Data
@Configuration  //声明为自定义配置类
@PropertySource("classpath:test.properties")  //指定配置文件位置
@EnableConfigurationProperties(MyProperties.class)  //开启对应配置类的属性注入功能
@ConfigurationProperties(prefix = "test")  //指定配置文件注入属性前缀
public class MyProperties {
    private int id;
    private String name;
}

2.Profile文件多环境配置

使用Profile文件进行多环境配置

在resource目录下创建多个以application-{profile}.properties格式命名的配置文件

激活指定环境的方式

1、通过命令

2、全局配置文件设置spring.profiles.active属性激活

@Profile注解多环境配置

@Profile:作用与类,通过value值指定环境配置

同样需要全局配置文件设置spring.profiles.active属性激活

案例:

1、resource目录下创建两个配置文件

application-{dev}.properties

application-{test}.properties

1、创建一个环境配置接口

public interface DBConnector {
    public void configure();
}

2.创建不同环境类实现接口

开发环境


@Configuration  //声明为配置类
@Profile(value = "dev")  //设置为dev环境
public class DevDBConnector implements DBConnector{

    @Override
    public void configure() {
        System.out.println("DEV开发环境");
    }
}

测试环境

@Configuration
@Profile(value = "test")
public class TestDBConnector implements DBConnector{
    @Override
    public void configure() {
        System.out.println("TEST测试环境");
    }
}

3.全局配置文件中设置spring.profiles.active

测试代码


    @Autowired
    private DBConnector dbConnector;

    @Test
    public void dbtest(){
        dbConnector.configure();
    }

配置文件随机值设置

参数间引用

第三章   SpringBoot数据访问

 SpringBoot整合Spring Data Jpa

案例:

mysql数据库

/*
 Navicat Premium Data Transfer

 Source Server         : book
 Source Server Type    : MySQL
 Source Server Version : 80027
 Source Host           : localhost:3307
 Source Schema         : springbootdata

 Target Server Type    : MySQL
 Target Server Version : 80027
 File Encoding         : 65001

 Date: 09/06/2024 17:13:35
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for t_article
-- ----------------------------
DROP TABLE IF EXISTS `t_article`;
CREATE TABLE `t_article`  (
  `id` int NOT NULL AUTO_INCREMENT COMMENT '文章id',
  `title` varchar(200) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '文章标题',
  `content` longtext CHARACTER SET utf8 COLLATE utf8_general_ci NULL COMMENT '文章内容',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of t_article
-- ----------------------------
INSERT INTO `t_article` VALUES (1, 'Spring Boot基础入门', '从入门到精通讲解...');
INSERT INTO `t_article` VALUES (2, 'Spring Cloud基础入门', '从入门到精通讲解...');

-- ----------------------------
-- Table structure for t_comment
-- ----------------------------
DROP TABLE IF EXISTS `t_comment`;
CREATE TABLE `t_comment`  (
  `id` int NOT NULL AUTO_INCREMENT COMMENT '评论id',
  `content` longtext CHARACTER SET utf8 COLLATE utf8_general_ci NULL COMMENT '评论内容',
  `author` varchar(200) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '评论作者',
  `a_id` int NULL DEFAULT NULL COMMENT '关联的文章id',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 6 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of t_comment
-- ----------------------------
INSERT INTO `t_comment` VALUES (1, '很全、很详细', '狂奔的蜗牛', 1);
INSERT INTO `t_comment` VALUES (2, '赞一个', 'tom', 1);
INSERT INTO `t_comment` VALUES (3, '很详细', 'kitty', 1);
INSERT INTO `t_comment` VALUES (4, '很好,非常详细', '张三', 1);
INSERT INTO `t_comment` VALUES (5, '很不错', '张杨', 2);

SET FOREIGN_KEY_CHECKS = 1;

1、配置maven导入坐标

         <!--JPA相关库-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <!--mysql插件-->
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
        </dependency>
        <

2、properties配置数据库连接

spring.datasource.url=mysql://localhost:3306/springbootdata?serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=12345678

3、创建ORM实体类

package com.gzist.domain;

import lombok.Data;
import org.springframework.stereotype.Component;

import javax.persistence.*;
@Data
@Entity(name = "t_comment")  //建立了实体类和数据表的关系   name指向表名
public class Discuss {
    //标识这是主键字段
    @Id
    //指定主键生成策略,GenerationType.IDENTITY就是对应到mysql中的数据自增策略
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    //使用@Column映射类的属性和数据表的字段关系  name指定表中的字段名
    //当类的属性名和数据表的字段名一致时,此注解可以省略
    private String content;
    private String author;
    @Column(name = "a_id")
    private Integer aId;
}

4.编写Repository接口,根据方法命名规则查询

package com.gzist.repository;

import com.gzist.domain.Discuss;
import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

//JpaRepository<Discuss,Integer>两个参数,一个是ORM实体类,一个是主键数据类型
public interface DiscussRepository extends JpaRepository<Discuss,Integer> {
    /**方法命名规则查询
     * 1.查询方法以findBy开头
     * 2.涉及条件查询时,条件的属性用条件关键字连接
     * 3.条件属性首字母需大写
     * */
    public List<Discuss> findByAuthorNotNull();

    //根据作者查询
    public List<Discuss> findByAuthor(String author);

    //根据内容模糊查询
    public List<Discuss> findByContentLike(String content);
    //根据内容和作者查询
    public List<Discuss> findByContentAndAuthor(String content,String author);
    //根据范围查询
    List<Discuss> findByIdIsLessThan(Integer id);

    List<Discuss> findByIdBetween(Integer startId, Integer endId);

    List<Discuss> findByIdIn(List<Integer> Ids);

}

测试

package com.gzist;

import com.gzist.domain.Discuss;
import com.gzist.repository.DiscussRepository;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.ArrayList;
import java.util.List;

@SpringBootTest
class JpaNamingRuleTest {

    @Autowired
    private DiscussRepository repository;

    @Test
    void testAuthorNotNull(){
        List<Discuss> byAuthorNotNull = repository.findByAuthorNotNull();
        for (Discuss discuss : byAuthorNotNull) {
            System.out.println(byAuthorNotNull);
        }
    }

    @Test
    void testAuthor(){
        List<Discuss> byAuthor = repository.findByAuthor("张杨");
        for (Discuss discuss : byAuthor) {
            System.out.println(discuss);

        }

    }


    @Test
    void testContentLike(){
        List<Discuss> byContentLike = repository.findByContentLike("%很%");
        for (Discuss discuss : byContentLike) {
            System.out.println(discuss);
        }

    }

    @Test
    void testAuthorAndContent(){
        List<Discuss> byContentAndAuthor = repository.findByContentAndAuthor("很不错", "张杨");
        for (Discuss discuss : byContentAndAuthor) {
            System.out.println(discuss);

        }
    }

    @Test
    void testIdIsLessThan(){
        List<Discuss> byIdIsLessThan = repository.findByIdIsLessThan(3);
        for (Discuss discuss : byIdIsLessThan) {
            System.out.println(discuss);

        }
    }

    @Test
    void testIdBetween(){
        List<Discuss> byAIdBetween = repository.findByIdBetween(2, 5);
        for (Discuss discuss : byAIdBetween) {
            System.out.println(discuss);

        }
    }

    @Test
    void testIdis(){
        ArrayList<Integer> list1 = new ArrayList<>();
        list1.add(2);
        list1.add(4);
        List<Discuss> byIdIs = repository.findByIdIn(list1);
        for (Discuss byIdI : byIdIs) {
            System.out.println(byIdI);
        }
    }

}

@Query查询

编写Repository接口

package com.gzist.repository;


import com.gzist.domain.Discuss;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.transaction.annotation.Transactional;


import java.util.List;

public interface JPQLRepository extends JpaRepository<Discuss,Integer>{
    //占位符从1开始
    //根据文章id分叶查询
    @Query("SELECT d FROM  t_comment d where d.aId= ?1")
    public List<Discuss> getDiscussPaged(Integer aid,Pageable pageable);

    //nativeQuery=ture使用原生SQL
    @Query(value = "SELECT * FROM  t_comment d where d.a_id= ?1",nativeQuery = true)
    public List<Discuss> getDiscussPaged1(Integer aid,Pageable pageable);

    @Transactional
    @Modifying
    @Query("UPDATE t_comment c SET c.author = ?1 where c.id = ?2")
    public int updateDiscuss(String author,Integer id);


    @Transactional
    @Modifying
    @Query("DELETE t_comment c where c.id = ?1")
    public int deleteDiscussById(Integer id);

}

测试

package com.gzist;

import com.gzist.domain.Discuss;
import com.gzist.repository.JPQLRepository;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;

import java.util.List;

@SpringBootTest
public class JPQLRepositoryTests {
    @Autowired
    private JPQLRepository jpqlRepository;
    @Test
    void testpages(){
        Pageable pageable = PageRequest.of(0,3);
        List<Discuss> discussPaged = jpqlRepository.getDiscussPaged(1,pageable);
        System.out.println(discussPaged);
    }

    @Test
    void testpages1(){
        Pageable pageable = PageRequest.of(0,3);
        List<Discuss> discussPaged = jpqlRepository.getDiscussPaged1(1,pageable);
        System.out.println(discussPaged);
    }

    @Test
    void testUpdataById(){
        int updateDiscuss = jpqlRepository.updateDiscuss("杨杨", 5);
        System.out.println("成功更新"+updateDiscuss+"条");
    }


    @Test
    void testDeleteById(){
        int delDiscuss = jpqlRepository.deleteDiscussById(6);
        System.out.println("成功删除"+delDiscuss+"条");
    }

}

SpringBoot整合Redis

案例:

1、添加依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

2、编写实体类

Persion.java

package com.gzist.domain;

import lombok.Data;
import org.springframework.data.annotation.Id;
import org.springframework.data.redis.core.RedisHash;
import org.springframework.data.redis.core.index.Indexed;

import java.util.List;

@Data
@RedisHash("person")  //指定操作实体类对象在Redis数据库中的存储空间
public class Person {
    @Id  //标识实体类主键
    private String id;
    @Indexed
    private String firstName;
    
    @Indexed
    private String lastName;
    
    private Address adreess;
    private List<Family> familyList;
}

Address.java

package com.gzist.domain;

import lombok.Data;
import org.springframework.data.redis.core.index.Indexed;

@Data
public class Address {
    @Indexed
    private String city;
    @Indexed
    private String country;
}

Family.java

package com.gzist.domain;

import lombok.Data;
import org.springframework.data.redis.core.index.Indexed;


@Data
public class Family {
    @Indexed
    private String type;
    @Indexed
    private String name;
}

3、编写Repository接口 ,需要注意的是操作Redis数据库时编写Repository接口需要继承Crud Repository,而不是JpaRepository,如果想继承JpaRepository需要同时添加Spring data JPA和spring Data Redis依赖

package com.gzist.repository;

import com.gzist.domain.Person;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.repository.CrudRepository;

import java.util.List;

//<Person,String>,Person为操作的实体类,String为实体类id的数据类型
public interface RedisRepository extends CrudRepository<Person,String> {
    List<Person> findByLastName(String lastname);
    Page findPersonByLastName(String lastname, Pageable pageable);
    List<Person> findByFirstNameAndLastName(String f,String l);
    List<Person> findByAdreess_City(String add_city);
    List<Person> findByFamilyList_Username(String username}

application.properties配置

spring.redis.host=127.0.0.1
spring.redis.port=6379
spring.redis.password=

编写单元测试

Version:1.0 StartHTML:0000000128 EndHTML:0000010693 StartFragment:0000000128 EndFragment:0000010693 SourceURL:about:blank
package com.gzist;

import com.gzist.domain.Address;
import com.gzist.domain.Family;
import com.gzist.domain.Person;
import com.gzist.repository.RedisRepository;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.ArrayList;
import java.util.List;

@SpringBootTest
class SpringRedisApplicationTests {

    @Autowired
    private RedisRepository redisRepository;

    @Test
    public void savePerson(){
        Person person = new Person("张","有才");
        Person person1 = new Person("Harden","James");

        Address address = new Address("北京","China");
        person.setAdreess(address);

        ArrayList<Family> families = new ArrayList<>();
        Family dad = new Family("父亲","张良");
        Family mom = new Family("母亲","李香");
        families.add(dad);
        families.add(mom);
        person.setFamilyList(families);

        //向Redis数据库添加数据
        Person save = redisRepository.save(person);
        Person save1 = redisRepository.save(person1);

        System.out.println(save);
        System.out.println(save1);


    }
    @Test
    public void selectPerson() {
        List<Person> personList = redisRepository.findByAdreess_City("北京");
        System.out.println(personList);
    }

    @Test
    public void updataPerson(){
        Person person = redisRepository.findByFirstNameAndLastName("张","有才").get(0);
        person.setLastName("小明");
        Person updata = redisRepository.save(person);
        System.out.println(updata);

    }


    @Test
    public void delPerson(){
        Person person = redisRepository.findByFirstNameAndLastName("张", "小明").get(0);
        redisRepository.delete(person);
    }

    @Test
    public void selectFamilyList(){
        List<Person> byFamilyListUsername = redisRepository.findByFamilyList_Username("张良");
        System.out.println(byFamilyListUsername);
    }


}

第四章  SpringBoot视图技术

Thymeleaf介绍

Thymeleaf入门

1、导入依赖

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

2、模板页面

 3、全局配置常用参数

#启用模板缓存,默认为true,一般上线时使用,开发过程通常会关闭,保证调试过程数据能够及时响应
spring.thymeleaf.cache = flase 
#模板编码
spring.thymeleaf.encoding = UTF-8 
#应用于模板的模式 
spring.thymeleaf.mode = HTML5   
#指定模板路径,默认classpath:/templates/  
spring.thymeleaf.prefix = classpath:/resources/templates/  
#指定模板名称后缀,默认.html
spring.thymeleaf.suffix = .html  

编写Controller,访问Controller跳转模板

获取简单类型

//Controller代码
package com.gzist.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class ThymeleafController {
    @RequestMapping("index")
    public String IndexPage(Model model){
        //简单类型,使用变量表达式 ${}获取对象属性
        model.addAttribute("name","张三");  //设置键值
        model.addAttribute("age","30");
        model.addAttribute("money","22.22");

        return "index"; //跳转到index
    }
}
变量表达式 ${...}获取
th:text
//html代码
<!DOCTYPE html>
<html leng="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>

<body>
<h3>Thymeleaf页面</h3>
<h3>简单类型数据获取</h3>
<span th:text="${name}"></span>
<span th:text="${age}"></span>
<span th:text="${money}"></span>
</body>
</html>

获取对象类型

package com.gzist.controller;

import com.gzist.pojo.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class ThymeleafController {
    @RequestMapping("index")
    public String IndexPage(Model model){

        //对象类型
        User user = new User(2,"csl","rap",0);
        model.addAttribute("user",user);
        return "index"; //跳转到index
    }
}
变量表达式 ${...}获取
<!DOCTYPE html>
<html leng="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>

<body>
<h3>Thymeleaf页面</h3>

<h3>对象类型数据获取</h3>
<!--使用对象.属性的方式获取-->
<span th:text="${user.id}"></span><br>
<span th:text="${user.name}"></span><br>
<span th:text="${user.hobby}"></span><br>
<span th:text="${user.sex}"></span><br>

</body>
</html>
选择表达式*{...}获取
th:object

使用方法:首先通过th:object 获取对象,然后使用th:xx = "*{}"获取对象属性。

<!DOCTYPE html>
<html leng="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>

<body>
<h3>Thymeleaf页面</h3>
<!--<h3>对象类型数据获取</h3>-->
<div th:object="${user}">
    <span th:text="*{id}"></span><br>
    <span th:text="*{name}"></span><br>
    <span th:text="*{hobby}"></span><br>
    <span th:text="*{sex}"></span><br>
</div>

</body>
</html>

获取集合类型

package com.gzist.controller;

import com.gzist.pojo.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.ArrayList;
import java.util.List;

@Controller
public class ThymeleafController {
    @RequestMapping("index")
    public String IndexPage(Model model){
        //集合类型
        List<User> userList = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            userList.add(new User(2+i,"cxk"+i,"rap"+i,0));
        }
        model.addAttribute("userList",userList);
        return "index"; //跳转到index


    }
}
th:each元素变量
<tr th:each="user, stat : ${users}">  
    <td th:text="${stat.index}"></td> <!-- 当前索引,从0开始 -->  
    <td th:text="${user.name}"></td>  
    <td th:text="${user.age}"></td>  
    <!-- 其他字段 -->  
</tr>
<!DOCTYPE html>
<html leng="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>

<body>
<h3>Thymeleaf页面</h3>

<!--<h3>集合类型数据获取</h3>-->
<table align="center" width="50%" cellspacing="0px" cellpadding="10px" border="1px">
    <tr>
        <th>编号</th>
        <th>id</th>
        <th>name</th>
        <th>hobby</th>
        <th>sex</th>
    </tr>
    <tr th:each="u,stat:${userList}">
        <td th:text="${stat.index+1}"></td>
        <td th:text="${u.id}"></td>
        <td th:text="${u.name}"></td>
        <td th:text="${u.hobby}"></td>
        <td th:text="${u.sex}"></td>
    </tr>

</table>

</body>
</html>

连接URL表达式@{...}

th:href
th:src
<a th:href="@{/home}">Home</a> 
<a th:href="@{'字符串'+${model}}">字符串+url拼接</a> 
<img th:src="@{/images/logo.png}" alt="Logo" />  
<a th:href="@{/search(query=${searchTerm},page=${currentPage-1})}">Previous Page</a>

条件判断标签

th:if和th:unless
<span th:if="${age > 18}">已成年</span>
<!--unless标签相当于if标签取反,条件未flase才输出-->
<span th:unless="${age > 18}">该处不会输出</span>
th:switch
//Controller数据

        List<User> userList = new ArrayList<>();
        userList.add(new User(1,"cxk1","rap1",0));
        userList.add(new User(2,"cxk2","rap2",1));
        userList.add(new User(3,"cxk3","rap3",0));
        userList.add(new User(4,"cxk4","rap4",3));
        userList.add(new User(5,"cxk5","rap5",0));

        model.addAttribute("userList",userList);
    <tr th:each="u,stat:${userList}">
        <td th:text="${stat.index+1}"></td>
        <td th:text="${u.id}"></td>
        <td th:text="${u.name}"></td>
        <td th:text="${u.hobby}"></td>
        <td th:switch="${u.sex}">
            <span th:case="0">女</span>
            <span th:case="1">男</span>
            <span th:case="*">未知</span>
        </td>
    </tr>

获取日期类型格式化

 //Controller数据,日期类型
        model.addAttribute("date",new Date());

//获取当前年份
model.addAttribute("currentYear1", Calendar.getInstance().get(Calendar.YEAR));
<!--#dates 是一个内置的工具对象,它提供了一组用于格式化、解析和操作日期和时间的方法。-->
<span th:text="${#dates.format(date,'yyyy-MM-dd HH:mm:ss')}"></span>
<span th:text="${currentYear}">2018</span>

内联标签与行内标签

th:inline
<span th:inline="text">姓名为:[[${name}]]</span>

 碎片标签与片段表达式~{...}

声明片段

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>其他标签也被包含了</div>
<div th:fragment="header" style="height: 200px;background-color: #889988">
<h1>标题</h1>
</div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div th:fragment="footer" style="height: 200px;background-color: #ff5654"></div>
</body>
</html>
th:include

th:include="header"等同th:include="~{ header}" 会引入完整页面

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div th:include="header"></div>
<div>自定义内容</div>
<div th:include="footer"></div>

</body>
</html>

则上述代码会生成

th:include="header :: header "等同th:include="~{ header :: header}"它会将指定模板的内容插入到当前标签的 <body><div> 等标签内,但不会替换当前标签本身。及仅插入子标签

<div th:include="header :: header"></div>

则上述代码会生成

<div>  
    <h1>标题</h1>  
</div>
   th:replace
<div th:replace="header :: header"></div>

则上述代码会生成:

<div th:fragment="header" style="height: 200px;background-color: #889988">
    <h1>标题</h1>
</div>
 th:insert
<div th:insert="header :: header"></div>

则上述代码会生成:

<div>
    <div style="height: 200px;background-color: #889988">
        <h1>标题</h1>
    </div>
</div>

国际化与消息表达式#{...}

1、编写多语言国际化文件及配置文件

login.properties(默认)

login.tip=请登录
login.username=用户名
login.password=密码
login.rememberme=记住我
login.button=登录

login_zh_CN.properties

login.tip=请登录
login.username=用户名
login.password=密码
login.rememberme=记住我
login.button=登录

login_en_US.properties

login.tip=Please sign in
login.username=Username
login.password=Password
login.rememberme=Remember me
login.button=Login

Springboot自动配置好了管理国际化资源文件的组件

//我们配置的文件可以直接放在类路径下叫messages.properties

 

我们这里配置在i18n的文件下,所以需要在全局properties配置spring.message.basename

spring.messages.basename=i18n.login

3、使用#{...}在页面获取国际化的值

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1,shrink-to-fit=no">
    <title>用户登录界面</title>
    <link th:href="@{/login/css/bootstrap.min.css}" rel="stylesheet">
    <link th:href="@{/login/css/signin.css}" rel="stylesheet">
</head>
<body class="text-center">
<!--  用户登录form表单 -->
<form class="form-signin">
    <img class="mb-4" th:src="@{/login/img/login.jpg}" width="72" height="72">
    <h1 class="h3 mb-3 font-weight-normal" th:text="#{login.tip}">请登录</h1>
    <input type="text" class="form-control"
           th:placeholder="#{login.username}" required="" autofocus="">
    <input type="password" class="form-control"
           th:placeholder="#{login.password}" required="">
    <div class="checkbox mb-3">
        <label>
            <input type="checkbox" value="remember-me"> [[#{login.rememberme}]]
        </label>
    </div>
    <button class="btn btn-lg btn-primary btn-block" type="submit" th:text="#{login.button}">登录</button>
    <p class="mt-5 mb-3 text-muted">© <span th:text="${currentYear}">2018</span>-<span th:text="${currentYear}+1">2019</span></p>
    <a class="btn btn-sm" th:href="@{/toLoginPage(l='zh_CN')}">中文</a>
    <a class="btn btn-sm" th:href="@{/toLoginPage(l='en_US')}">English</a>
</form>
</body>
</html>

编写Controller访问就可以根据改变浏览器语言切换中英文了

package com.gzist.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class I18nController {

    @GetMapping("/toLoginPage")
    public String loginPage(Model model){

        return "login";
    }

}

如果乱码,settings搜索file encodings

原理:

国际化有一个重要的对象Locale(区域信息对象),和一个组件LocaleResolver(获取区域信息对象)

在AcceptHeaderLocaleResolver有一个方法用于从请求头中解析区域信息

默认的就是根据请求头带来的区域信息获取Locale进行国际化

如果我们想通过链接跳转需要自己定义重写一个LocaleResolver,请求时携带区域信息

package com.gzist.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.LocaleResolver;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Locale;

@Configuration
//实现LocaleResolver
public class MyLocaleResolver implements LocaleResolver {
    @Override
    public Locale resolveLocale(HttpServletRequest request) {
        //获取参数带来的值
        String lang = request.getParameter("l");
        //如没带区域信息就使用默认的
        Locale locale = Locale.getDefault();
        //判断lang是否为空,request是否带来了区域信息
        if(!StringUtils.isEmpty(lang)){
            //切割带来的区域信息
            String[] split = lang.split("_");
            //new一个区域信息,split[0]语言代码,split[1]国家代码
            locale = new Locale(split[0],split[1]);

        }

        return locale;
    }

    @Override
    public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {

    }

    //将自定义的MyLocaleResolver类重新注册为一个类型LocaleResolver的Bean主键
    @Bean
    public LocaleResolver localeResolver(){
        return new MyLocaleResolver();
    }
}

第五章 SpringBoot实现Web的常用功能

整合spring MVC

SpringBoot项目中,一旦引入了Web依赖启动器 spring-boot-starter-web,那么 SpringBoot 整合 Spring MVC 框架默认实现的一些 xxxAutoConfiguration 自动配置类就会自动生效,几乎可以在无任何额外配置的情况下进行Web 开发。Spring Boot 为整合 Spring MVC 框架实现web 开发,主要提供了以下自动化配置的功能特性。
(1 )内置了两个视图解析器:ContentNegotiatingViewResolver 和 BeanNameViewResolver。
(2)支持静态资源以及 WebJars。
(3)自动注册了转换器和格式化器。
(4)支持 Http 消息转换器。
(5)自动注册了消息代码解析器。
(6) 支持静态项目首页 index.html。
(7) 支持定制应用图标 favicon.ico。
(8)自动初始化 Web 数据绑定器 ConfigurableWebBindingInitializer。
Spring Boot 整合Spring MVC 进行Web 开发时提供了很多默认配置,而且大多数时候使用默认配置即可满足开发需求。例如,Spring Boot整合 Spring MVC进行Web 开发时,不需要额外配置视图解析器

接下来整合SpringMVC实现简单页面跳转,这里将使用springboot提供的WebMvcConfigurer接口编写自定义配置,并适当扩展

1.注册视图管理器

创建一个MyMVCconfig实现WebMvcConfigurer接口,重写addViewControllers方法

package com.gzist.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class MyMVCconfig implements WebMvcConfigurer {

    //注册视图管理器
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        //访问/toLoginPage跳转login.html
        registry.addViewController("/toLoginPage").setViewName("login");
        //访问/login.html跳转login.html
        registry.addViewController("/login.html").setViewName("login");
    }



}

这时已经实现访问/toLoginPage和/login.html都跳转到模板/login.html,但是年份获取不到了

addViewControllers方法只适合简单的无参数视图Get方式的请求跳转,对于有参数或业务的跳转需求最好还是采用传统的处理请求

2.注册拦截器

package com.gzist.config;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import java.util.Calendar;

@Component
public class MyInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, Object handler) throws Exception {
        String uri = request.getRequestURI();
        Object loginUser = request.getSession().getAttribute("loginUser");
        if (loginUser == null && uri.startsWith("/admin")) {
            response.sendRedirect("/toLoginPage");
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        //向request域中存放年份用于页面动态展示
        request.setAttribute("currentYear", Calendar.getInstance().get(Calendar.YEAR));
    }

}

在MyMVCconfig注册拦截器

package com.gzist.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class MyMVCconfig implements WebMvcConfigurer {
    @Autowired
    private MyInterceptor myInterceptor;
    //注册拦截器
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(myInterceptor).addPathPatterns("/**").excludePathPatterns("/login.html");
    }
    //注册视图管理器
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/toLoginPage").setViewName("login");
        registry.addViewController("/login.html").setViewName("login");
    }



}

组件注册整合Servlet三大组件

1.组件整合Servlet

创建一个包servletComponent

自定义一个MyServlet类继承HttpServlet

package com.gzist.servletComponent;

import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServlet;

@Component
public class MyServlet extends HttpServlet {
    @Override
    public void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, java.io.IOException {
        this.doPost(request, response);
    }

    @Override
    public void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, java.io.IOException {
        response.getWriter().write("hello servlet");
    }
}

自定义一个MyFilter类实现Filter

package com.gzist.servletComponent;

import org.springframework.stereotype.Component;

import javax.servlet.*;
import java.io.IOException;

@Component  // 注册到Spring容器
public class MyFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        Filter.super.init(filterConfig);
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("执行了Filer");
        chain.doFilter(request,response);
    }

    @Override
    public void destroy() {
        Filter.super.destroy();
    }
}

自定义一个MyListener类实现ServletContextListener

package com.gzist.servletComponent;

import org.springframework.stereotype.Component;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

@Component  // 注册到Spring容器
public class MyListener implements ServletContextListener{
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        System.out.println("MyListener监听到项目启动");
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        System.out.println("MyListener监听到项目关闭");
    }
}

2.在config包下创建servletConfig配置类注册Servlet三大组件

package com.gzist.config;

import com.gzist.servletComponent.MyFilter;
import com.gzist.servletComponent.MyListener;
import com.gzist.servletComponent.MyServlet;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Arrays;


@Configuration
public class servletConfig {
    //注册servlet组件
    @Bean
    public ServletRegistrationBean getServlet(MyServlet myServlet){
        //创建servlet组件
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(myServlet,"/myServlet");
        return servletRegistrationBean;
    }

    @Bean
    public FilterRegistrationBean getFilter(MyFilter myFilter){

        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(myFilter);
        filterRegistrationBean.setUrlPatterns(Arrays.asList("/toLoginPage"));
        return filterRegistrationBean;
    }

    @Bean
    public ServletListenerRegistrationBean getListener(MyListener myListener){

        ServletListenerRegistrationBean servletListenerRegistrationBean = new ServletListenerRegistrationBean(myListener);
        return servletListenerRegistrationBean;
    }
}

路径扫描方式整合Servlet三大组件

把组件整合的方式修改一下,@Component注解分别改为@WebServlet,@WebFilter,@WebListen,然后在主程序启动类上添加@ServletComponentScan

MyServlet


@WebServlet("/myservlet")  // 注册到Spring容器
public class MyServlet extends HttpServlet {
...
}

MyFilter

@WebFilter("/toLoginPage")  // 注册到Spring容器
public class MyFilter implements Filter {
...
}

MyListener

@WebListener  // 注册到Spring容器
public class MyListener implements ServletContextListener{
...
}

主程序启动类

package com.gzist;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;

@SpringBootApplication
@ServletComponentScan
public class SpringMvcApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringMvcApplication.class, args);
    }

}

文件上传、下载

pom.xml添加依赖

        <!-- 进行文件下载的工具依赖 -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>

上传模板

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>动态添加文件上传列表</title>
    <link th:href="@{/login/css/bootstrap.min.css}" rel="stylesheet">
    <script th:src="@{/login/js/jquery.min.js}"></script>
</head>
<body>
<div th:if="${uploadStatus}" style="color: red" th:text="${uploadStatus}">上传成功</div>
<form th:action="@{/uploadFile}" method="post" enctype="multipart/form-data">
    上传文件:&nbsp;&nbsp;<input type="button" value="添加文件" onclick="add()"/>
    <div id="file" style="margin-top: 10px;" th:value="文件上传区域">  </div>
    <input id="submit" type="submit" value="上传"
           style="display: none;margin-top: 10px;"/>
</form>
<script type="text/javascript">
    // 动态添加上传按钮
    function add(){
        var innerdiv = "<div>";
        innerdiv += "<input type='file' name='fileUpload' required='required'>" +
            "<input type='button' value='删除' onclick='remove(this)'>";
        innerdiv +="</div>";
        $("#file").append(innerdiv);
        // 打开上传按钮
        $("#submit").css("display","block");
    }
    // 删除当前行<div>
    function remove(obj) {
        $(obj).parent().remove();
        if($("#file div").length ==0){
            $("#submit").css("display","none");
        }
    }
</script>
</body>
</html>

下载模板

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>文件下载</title>
</head>
<body>
<div style="margin-bottom: 10px">文件下载列表:</div>
<table>
    <tr>
        <td>bloglogo.jpg</td>
        <td><a th:href="@{/download(filename='bloglogo.jpg')}">下载文件</a></td>
    </tr>
    <tr>
        <td>Spring Boot应用级开发教程.pdf</td>
        <td><a th:href="@{/download(filename='Spring Boot应用级开发教程.pdf')}">
            下载文件</a></td>
    </tr>
</table>
</body>
</html>

上传下载Controller

package com.itheima.controller;

import org.apache.commons.io.FileUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.net.URLEncoder;
import java.util.UUID;
/**
 * 文件管理控制类
 */
@Controller
public class FileController {
    // 向文件上传页面跳转
    @GetMapping("/toUpload")
    public String toUpload(){
        return "upload";
    }
    // 文件上传管理
    @PostMapping("/uploadFile")
    public String uploadFile(MultipartFile[] fileUpload, Model model) {
        // 默认文件上传成功,并返回状态信息
        model.addAttribute("uploadStatus", "上传成功!");
        for (MultipartFile file : fileUpload) {
            // 获取文件名以及后缀名
            String fileName = file.getOriginalFilename();
            // 重新生成文件名(根据具体情况生成对应文件名)
            fileName = UUID.randomUUID()+"_"+fileName;
            // 指定上传文件本地存储目录,不存在需要提前创建
            String dirPath = "F:/file/";
            File filePath = new File(dirPath);
            if(!filePath.exists()){
                filePath.mkdirs();
            }
            try {
                file.transferTo(new File(dirPath+fileName));
            } catch (Exception e) {
                e.printStackTrace();
                // 上传失败,返回失败信息
                model.addAttribute("uploadStatus","上传失败: "+e.getMessage());
            }
        }
        // 携带上传状态信息回调到文件上传页面
        return "upload";
    }

    // 向文件下载页面跳转
    @GetMapping("/toDownload")
    public String toDownload(){
        return "download";
    }
//    // 文件下载管理
//    @GetMapping("/download")
//    public ResponseEntity<byte[]> fileDownload(String filename){
//        // 指定要下载的文件根路径
//        String dirPath = "F:/file/";
//        // 创建该文件对象
//        File file = new File(dirPath + File.separator + filename);
//        // 设置响应头
//        HttpHeaders headers = new HttpHeaders();
//        // 通知浏览器以下载方式打开
//        headers.setContentDispositionFormData("attachment",filename);
//        // 定义以流的形式下载返回文件数据
//        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
//        try {
//            return new ResponseEntity<>(FileUtils.readFileToByteArray(file), headers, HttpStatus.OK);
//        } catch (Exception e) {
//            e.printStackTrace();
//            return new ResponseEntity<byte[]>(e.getMessage().getBytes(),HttpStatus.EXPECTATION_FAILED);
//        }
//    }

    // 所有类型文件下载管理
    @GetMapping("/download")
    public ResponseEntity<byte[]> fileDownload(HttpServletRequest request,
                                               String filename) throws Exception{
        // 指定要下载的文件根路径
        String dirPath = "F:/file/";
        // 创建该文件对象
        File file = new File(dirPath + File.separator + filename);
        // 设置响应头
        HttpHeaders headers = new HttpHeaders();
        // 通知浏览器以下载方式打开(下载前对文件名进行转码)
        filename=getFilename(request,filename);
        headers.setContentDispositionFormData("attachment",filename);
        // 定义以流的形式下载返回文件数据
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        try {
            return new ResponseEntity<>(FileUtils.readFileToByteArray(file), headers, HttpStatus.OK);
        } catch (Exception e) {
            e.printStackTrace();
            return new ResponseEntity<byte[]>(e.getMessage().getBytes(),HttpStatus.EXPECTATION_FAILED);
        }
    }
    // 根据浏览器的不同进行编码设置,返回编码后的文件名
    private String getFilename(HttpServletRequest request, String filename)
            throws Exception {
        // IE不同版本User-Agent中出现的关键词
        String[] IEBrowserKeyWords = {"MSIE", "Trident", "Edge"};
        // 获取请求头代理信息
        String userAgent = request.getHeader("User-Agent");
        for (String keyWord : IEBrowserKeyWords) {
            if (userAgent.contains(keyWord)) {
                //IE内核浏览器,统一为UTF-8编码显示,并对转换的+进行更正
                return URLEncoder.encode(filename, "UTF-8").replace("+"," ");
            }
        }
        //火狐等其它浏览器统一为ISO-8859-1编码显示
        return new String(filename.getBytes("UTF-8"), "ISO-8859-1");
    }


}

 JAR包方式打包部署

pom.xml依赖,一般在初始化的时候默认的

 <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
            </plugin>
        </plugins>
    </build>

WAR包方式打包部署

1.在pom.xml中声明war打包方式
 

    <!-- 1、将项目打包方式声明为war  -->
<description>Demo project for Spring Boot</description>

    <packaging>war</packaging>

2.在pom.xml中声明使用外部Tomcat

     <!-- 2、声明使用外部提供的Tomcat  -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>

3.提供 Spring Boot 启动的 Servlet 初始化器。将 Spring Boot 项目生成可部署War 包的最后一步也是最車要的一步就是提供 SpringBootServletlnitializer 子类并覆盖其:contigure()万法,这样做是利用了 Spring 框架的 Servlet 3.0支持,允许应用程序在 Servlet 容器启动时可以进行配置。打开 项目的主程序启动类 ,让其继承SpringBootServletlnitializer 并实现 configure()方法

package com.itheima;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

@ServletComponentScan  // 开启基于注解方式的Servlet组件扫描支持
@SpringBootApplication
public class Chapter05Application extends SpringBootServletInitializer {
    // 3、程序主类继承SpringBootServletInitializer,并重写configure()方法
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(Chapter05Application.class);
    }

    public static void main(String[] args) {
        SpringApplication.run(Chapter05Application.class, args);
    }

}

打包好的War 包复制到Tomcat 安装目录下的webapps 目录中,执行 Tomcat 安装目录下bin目录中的startup.bat 命令启动War 包项目 

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