Spring 基于XML开发 bean 配置 连接池

目录

​​约束​​

​​bean 存入spring容器​​

​​整合Junit​​

​​手动获取Spring容器​​

​​xml配置连接池​​

约束

        spring约束需要在spring官网复制 为了省去麻烦 这里直接给出网址​​Core Technologies​​

方框中的就是约束 把它复制下来放到xml文件中 这里只是简单的约束 下面是全部约束

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                  http://www.springframework.org/schema/beans/spring-beans.xsd
                  http://www.springframework.org/schema/mvc
                  http://www.springframework.org/schema/mvc/spring-mvc.xsd
                  http://www.springframework.org/schema/aop
                  http://www.springframework.org/schema/aop/spring-aop.xsd
                  http://www.springframework.org/schema/context
                  http://www.springframework.org/schema/context/spring-context.xsd
                  http://www.springframework.org/schema/tx
                  http://www.springframework.org/schema/tx/spring-tx.xsd">

bean 存入spring容器

        bean标签：用于配置让spring创建对象 并且存入ioc容器中

        id：对象的唯一标识

        class：指定类的全限定类名

        例如
 

<bean id="accountService" class="com.itheima.service.impl.AccountServiceImpl">

        当对象中有属性的时候必须 要有set方法 xml中使用property给对象属性赋值

        property标签：给对象属性赋值

        name：对象属性名

        ref：引用bean标签创建的对象 赋值给对象的属性

<bean id = "userDao" class="com.czxy.demo02.dao.impl.UserDaoImpl"></bean>

    <bean id = "userService" class="com.czxy.demo02.service.Impl.UserServiceImpl">
        <property name="userDaoimpl" ref="userDao"></property>
    </bean>

整合Junit

        对应整合Junit只是加载配置文件有些不同 以前加载配置文件@ContextConfiguration的属性是

classes 现在xml加载配置文件@ContextConfiguration属性是locations 是个数组 指定xml配置文件

@RunWith(SpringRunner.class)
@ContextConfiguration(locations = {"classpath:demo03.xml"})
public class TestA {

    @Resource(name = "dataSource")
    private DataSource dataSource;


    @Test
    public void test01(){
        System.out.println(dataSource);
    }
}

手动获取Spring容器

        BeanFactory是所有类的顶层接口

        ClassPathXmlApplicationContext：从类路径下加载配置文件【使用这种】

        FileSystemXmlApplicationContext：从磁盘路径下加载配置文件

        使用getBean获取对象

public class TestB {
    public static void main(String[] args) {
        BeanFactory beanFactory = new ClassPathXmlApplicationContext("demo01.xml");
        User user = (User)beanFactory.getBean("user");
        user.dao();
    }
}

xml配置连接池

        使用context:property-placeholder加载属性配置文件

        最后创建Druid对象 依次注入属性 放入IOC容器

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                  http://www.springframework.org/schema/beans/spring-beans.xsd
                  http://www.springframework.org/schema/mvc
                  http://www.springframework.org/schema/mvc/spring-mvc.xsd
                  http://www.springframework.org/schema/aop
                  http://www.springframework.org/schema/aop/spring-aop.xsd
                  http://www.springframework.org/schema/context
                  http://www.springframework.org/schema/context/spring-context.xsd
                  http://www.springframework.org/schema/tx
                  http://www.springframework.org/schema/tx/spring-tx.xsd">

    <context:property-placeholder location = "classpath:db.properties"></context:property-placeholder>

    <bean id = "dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
 </beans>