為什么使用spring依賴注入詳見–》依賴注入分析
1.創(chuàng)建實(shí)體類User類

package com.hao.domain;public class User {private String name;private String addr;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getAddr() {return addr;}public void setAddr(String addr) {this.addr = addr;}@Overridepublic String toString() {return "User{" +"name='" + name + '\'' +", addr='" + addr + '\'' +'}';} }

2.UserDao接口及其實(shí)現(xiàn)類UserDaoImpl（接口代碼省略）

public class UserDaoImpl implements UserDao {private List<String> strList; //集合private Map<String, User> userMap;//集和，集合中也包括User引用private Properties properties;//使用set方法注入public void setStrList(List<String> strList) {this.strList = strList;}public void setUserMap(Map<String, User> userMap) {this.userMap = userMap;}public void setProperties(Properties properties) {this.properties = properties;}@Overridepublic void save1() {System.out.println(strList);System.out.println(userMap);System.out.println(properties);} }

3.UserService接口以及UserServiceImpl實(shí)現(xiàn)類（省略接口代碼）

public class UserServiceImpl implements UserService {private UserDao userDao;public UserServiceImpl() {}public UserServiceImpl(UserDao userDao) {this.userDao = userDao;}@Overridepublic void sava() {userDao.save1();} }

3.applicationContext.xml配置文件

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd"><bean id="userDao" class="com.hao.dao.impl.UserDaoImpl"><property name="strList"><list><value>aaa</value><value>bbb</value><value>ccc</value></list></property><property name="userMap"><map><entry key="user1" value-ref="user1"></entry><entry key="user2" value-ref="user2"></entry></map></property><property name="properties"><props><prop key="p1">ppp1</prop><prop key="p2">ppp2</prop><prop key="p3">ppp3</prop></props></property></bean>//因?yàn)閙ap集合里面包括User引用，而User類中還有其他屬性，所以需要進(jìn)行注入，然后通過id被上面配置的value-ref引入<bean id="user1" class="com.hao.domain.User"><property name="name" value="tom"/><property name="addr" value="beijing"/></bean><bean id="user2" class="com.hao.domain.User"><property name="name" value="jin"/><property name="addr" value="tianjing"/></bean><bean id="userService" class="com.hao.service.impl.UserServiceImpl"><constructor-arg name="userDao" ref="userDao"></constructor-arg></bean> </beans>

5.測試類

public class UserController {public static void main(String[] args) {ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");UserService service = (UserService) context.getBean("userService");service.sava();} }

結(jié)果當(dāng)然顯而易見了

總結(jié)

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