IOC配置-第三方的bean的配置方式_applicationcontext.xml如何配置第三方的bean-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_31426093/article/details/129872334

该文展示了Spring配置文件`applicationContext.xml`的内容，包括加载context命名空间、属性配置文件、数据源设置以及Bean的定义。文中还引用了DruidDataSource作为数据源，并提供了Java代码示例来加载配置并获取数据源。

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applicationContext.xml

<?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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       https://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

    <!--1.加载context命名空间支持，xmlns:context="http://www.springframework.org/schema/context"-->
    <!--2.加载配置文件-->
    <context:property-placeholder location="classpath:*.properties"/>

    <!--<bean id="userDao" class="com.itheima.Dao.impl.UserDaoImpl">
        <property name="username" value="${username}"/>
        <property name="password" value="${pwd}"/>
    </bean>
    <bean id="bookDao" class="com.itheima.Dao.impl.BookDaoImpl"/>
    <bean id="userService" class="com.itheima.service.impl.UserServiceImpl">
        <property name="userDao" ref="userDao"/>
        <property name="bookDao" ref="bookDao"/>
    </bean>-->

    <!--<bean id="userDao" class="com.itheima.Dao.impl.UserDaoImpl">
        <property name="username" value="${username}"/>
        <property name="password" value="${pwd}"/>
    </bean>
    <bean id="bookDao" class="com.itheima.Dao.impl.BookDaoImpl"/>
    <bean id="userService" class="com.itheima.service.impl.UserServiceImpl">
        <property name="userDao" ref="userDao"/>
        <property name="bookDao" ref="bookDao"/>
    </bean>-->


    <!--<import resource="applicationContext-user.xml"/>
    <import resource="applicationContext-book.xml"/>
    <import resource="applicationContext-book2.xml"/>-->

    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/spring_db"/>
        <property name="username" value="root"/>
        <property name="password" value="itheima"/>
    </bean>

</beans>

import com.alibaba.druid.pool.DruidDataSource;
import com.itheima.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class UserApp {
    public static void main(String[] args) {
        //2.加载配置文件
        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
        //ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext-user.xml","applicationContext-book.xml");
        //3.获取资源
       /* UserService userService = (UserService) ctx.getBean("userService");
        userService.save();*/


        DruidDataSource dataSource = (DruidDataSource) ctx.getBean("dataSource");

    }
}

pox.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.example</groupId>
  <artifactId>Spring_day01_01_IOC</artifactId>
  <version>1.0-SNAPSHOT</version>
  <name>Archetype - Spring_day01_01_IOC</name>
  <url>http://maven.apache.org</url>

 <!-- <groupId>com.itheima</groupId>
  <artifactId>Spring_day01_01_IOC</artifactId>
  <version>1.0-SNAPSHOT</version>-->

  <dependencies>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>6.0.6</version>
    </dependency>

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.16</version>
    </dependency>

  </dependencies>

</project>