通过写set方法,注入set方法,达到”从spring容器获取的service bean内部包含dao对象”的目的
[开发步骤]
- dao实现类中写set方法
- xml中配置set方法
- 测试类中无需改动,此时从spring容器获取service对象默认包含dao对象
MODULE:jSpringAbc com.it.service包 UserService接口package com.it.service;
public interface UserService {
void save();
}
com.it.service.impl包 UserServiceImpl类package com.it.service.impl;
import com.it.dao.UserDao;
import com.it.service.UserService;
public class UserServiceImpl implements UserService {
private UserDao userDao;
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
@Override
public void save() {
userDao.save();
}
}
resources包 applicationContext.xml文件 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
package com.it.test;
import com.it.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class SetDependencyInjectDemo {
public static void main(String[] args) {
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
UserService userService=(UserService)applicationContext.getBean("userService");
userService.save();
}
}
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