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Spring Boot自我笔记

海牙秋天 2022-03-11 阅读 38

先用spring提供的建项目

选需要用的东西

先配一下启动类上的包扫描 (mybatis)

准备配一下redis

<!--redis-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.75</version>
</dependency>

 还有个druid忘了

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.2.8</version>
</dependency>

 

再加一个swagger

<!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger2 -->
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>2.9.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger-ui -->
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
    <version>2.9.2</version>
</dependency>

开始看配置文件

# 应用名称
spring.application.name=boot
#下面这些内容是为了让MyBatis映射
#指定Mybatis的Mapper文件
#mybatis.mapper-locations=classpath:mappers/*.xml
#指定Mybatis的实体目录
mybatis.type-aliases-package=com.zhu.pojo
##日志文件打印sql
logging.level.com.zhu.dao=DEBUG


# 数据库驱动:
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
# 数据源名称
spring.datasource.name=defaultDataSource
# 数据库连接地址
spring.datasource.url=jdbc:mysql://localhost:3306/myfile?serverTimezone=UTC
# 数据库用户名&密码:
spring.datasource.username=root
spring.datasource.password=root

#指定数据源类型
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
# 配置druid数据源信息
spring.datasource.druid.initial-size=10
spring.datasource.druid.max-active=20
spring.datasource.druid.min-idle=3
# 应用服务 WEB 访问端口
server.port=8080

## id生成策略 数据库自增
#mybatis-plus.global-config.db-config.id-type=auto

# 配置redis
spring.redis.host=127.0.0.1
spring.redis.port=6379

# 配置pageHelper插件(官方推荐配置)
#指定方言,使用mysql数据库
pagehelper.helper-dialect=mysql
#参数合理化
pagehelper.reasonable=true
#支持通过 Mapper 接口参数来传递分页参数
pagehelper.support-methods-arguments=true
#为了支持startPage(Object params)方法,增加了该参数来配置参数映射
pagehelper.params=countSql

这个里面还有一个mybatis的分页插件

   <!-- 添加pagehelper依赖-->
<!--                <dependency>-->
<!--                    <groupId>com.github.pagehelper</groupId>-->
<!--                    <artifactId>pagehelper</artifactId>-->
<!--                    <version>5.2.0</version>-->
<!--                </dependency>-->
<!--                <dependency>-->
<!--                    <groupId>com.github.pagehelper</groupId>-->
<!--                    <artifactId>pagehelper-spring-boot-starter</artifactId>-->
<!--                    <version>1.2.6</version>-->
<!--                </dependency>-->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.4.0</version>
        </dependency>

配一个logo

基本的包结构

 

mybatis_plus的分页

@Configuration
public class PageConfig {
/**
* 3.4.0之前的版本用这个
* @Bean
* public PaginationInterceptor paginationInterceptor(){
* return new PaginationInterceptor();
* }
*/


/**
* 3.4.0之后提供的拦截器的配置方式
*/

@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor() {
MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor());
return mybatisPlusInterceptor;
}

}

 简化redis的工具类配置

@Configuration
@ConditionalOnClass(RedisOperations.class)
@EnableConfigurationProperties(RedisProperties.class)
public class RedisConfig {


@Bean
@ConditionalOnMissingBean(name = "redisTemplate")
public RedisTemplate<Object, Object> redisTemplate(
RedisConnectionFactory redisConnectionFactory)
{
RedisTemplate<Object, Object> template = new RedisTemplate<>();
//使用fastjson序列化
FastJsonRedisSerializer fastJsonRedisSerializer = new FastJsonRedisSerializer(Object.class);
// value值的序列化采用fastJsonRedisSerializer
template.setValueSerializer(fastJsonRedisSerializer);
template.setHashValueSerializer(fastJsonRedisSerializer);
// key的序列化采用StringRedisSerializer
template.setKeySerializer(new StringRedisSerializer());
template.setHashKeySerializer(new StringRedisSerializer());
template.setConnectionFactory(redisConnectionFactory);
return template;
}

@Bean
@ConditionalOnMissingBean(StringRedisTemplate.class)
public StringRedisTemplate stringRedisTemplate(
RedisConnectionFactory redisConnectionFactory)
{
StringRedisTemplate template = new StringRedisTemplate();
template.setConnectionFactory(redisConnectionFactory);
return template;
}

}

redis还有一个超长的工具类,没有写

swagger配置
@Configuration //配置类
@EnableSwagger2// 开启Swagger2的自动配置
public class SwaggerConfig {



}

mybatis-plus的实体类

 

dao层

(mybatis-plus)

public interface TbUserDao extends BaseMapper<TbUser> {
}

(mybatis)

//@Mapper
public interface UserDao {
// @Select("select * from user")
List<User> findAll();

}

mybatis的xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.zhu.dao.UserDao">

<select id="findAll" resultType="com.zhu.pojo.User">
select * from user
</select>
</mapper>

 

正常的service先接口

public interface UserService {

List<User> findAll();

PageInfo<User> page(int pageNum, int pageSize);//pageNum:当前页数 pagSize:每页显示的个数
}

然后实现类(实现类上的@Service别忘了)

里面有一个mybatis的分页

@Service
public class UserServiceImpl implements UserService {

@Autowired
private UserDao userDao;

@Override
public List<User> findAll() {
List<User> all = userDao.findAll();
return all;
}

@Override
public PageInfo<User> page(int pageNum, int pageSize) {
//指定分页信息
PageHelper.startPage(pageNum,pageSize);
//查询数据
List<User> all = userDao.findAll();
//把查询数据封装到pageInfo中
PageInfo pageInfo = new PageInfo(all);
return pageInfo;
}


}

然后Controller层(用了一个统一格式输出)

//@Controller和@ResponseBody
@RestController
@RequestMapping("/user")
public class UserController {

@Autowired
private UserService userService;

@CrossOrigin
@PostMapping("/find")
public Result findAll(){
List<User> all = userService.findAll();
if (all!=null){
return new Result(Code.GET_OK,all);
}else {
return new Result(Code.GET_NO);
}
// return new Result(null !=all? Code.GET_OK:Code.GET_NO,all);

}
}

 

public class Code {

public static final Integer SAVE_OK= 20011;
public static final Integer UPDATE_OK= 20021;
public static final Integer DELETE_OK= 20031;
public static final Integer GET_OK= 20041;

public static final Integer SAVE_NO= 40010;
public static final Integer UPDATE_NO= 40020;
public static final Integer DELETE_NO= 40030;
public static final Integer GET_NO= 40040;


}
public class Result {
//操作编码
private Integer code;
//查到到结果
private Object date;
//消息,备注
private String message;


public Result() {
}

public Result(Integer code, Object date) {
this.code = code;
this.date = date;
}

public Result(Integer code) {
this.code = code;
}

@Override
public String toString() {
return "Result{" +
"code=" + code +
", date=" + date +
", message='" + message + '\'' +
'}';
}

public Integer getCode() {
return code;
}

public void setCode(Integer code) {
this.code = code;
}

public Object getDate() {
return date;
}

public void setDate(Object date) {
this.date = date;
}

public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}
}
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