spring获取applicationContext.xml中bean内容

最新推荐文章于 2025-03-15 16:48:02 发布

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本文详细介绍了如何使用Spring框架进行Bean工厂管理和ApplicationContext配置，包括XML文件加载、Bean注入及调用方法。

***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:context="http://www.springframework.org/schema/context"
        xmlns:tx="http://www.springframework.org/schema/tx"
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
                http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
                http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

    <bean id="userDao" class="cn.com.dao.UserDaoImp">
        <property name="jdbcUrl" value="jdbc:mysql:///test"></property>
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
    </bean>

    <bean id="userService" class="cn.com.service.UserServiceImp">
        <property name="userDao" ref="userDao"></property>
    </bean>

</beans>

package cn.com.dao;
import org.springframework.stereotype.Repository;

@Repository
public class UserDaoImp implements UserDao{

    private String jdbcUrl;
    private String driverClass;
    private String username;
    private String password;

    @Override
    public void printInfo() {
        System.out.println("jdbcUrl = " + jdbcUrl);
        System.out.println("driverClass = " + driverClass);
        System.out.println("username = " + username);
        System.out.println("password = " + password);
    }

    public String getJdbcUrl() {
        return jdbcUrl;
    }

    public void setJdbcUrl(String jdbcUrl) {
        this.jdbcUrl = jdbcUrl;
    }

    public String getDriverClass() {
        return driverClass;
    }

    public void setDriverClass(String driverClass) {
        this.driverClass = driverClass;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

package cn.com.service;

import cn.com.dao.UserDao;

public class UserServiceImp {
    private UserDao userDao;

    public UserDao getUserDao() {
        System.out.println("UserServiceImpl.getUserDao()");
        return userDao;
    }

    public void setUserDao(UserDao userDao) {
        System.out.println("UserServiceImpl.setUserDao()");
        this.userDao = userDao;
    }
}

***测试类***
    第一种
    @Test
    public void testBeanFactory() throws Exception {
        Resource resource = new ClassPathResource("applicationContext.xml");
        BeanFactory beanFactory = new XmlBeanFactory(resource);
        UserServiceImp userService = (UserServiceImp) beanFactory.getBean("userService");
        userService.getUserDao().printInfo();
    }

    第二种
    @Test
    public void testApplicationContext() throws Exception {
        ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserServiceImp userService = (UserServiceImp) app.getBean("userService");
        System.out.println(userService.getUserDao().toString());
        userService.getUserDao().printInfo();
    }