Spring-Bean依赖注入(引用数据类型和集合数据类型)
本文内容纲要:Spring-Bean依赖注入(引用数据类型和集合数据类型)
为什么使用spring依赖注入详见–》依赖注入分析
1.创建实体类User类
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;
}
@Override
public String toString() {
return "User{" +
"name='" + name + '\'' +
", addr='" + addr + '\'' +
'}';
}
}
2.UserDao接口及其实现类UserDaoImpl(接口代码省略)
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;
}
@Override
public void save1() {
System.out.println(strList);
System.out.println(userMap);
System.out.println(properties);
}
}
3.UserService接口以及UserServiceImpl实现类(省略接口代码)
public class UserServiceImpl implements UserService { private UserDao userDao;
public UserServiceImpl() {
}
public UserServiceImpl(UserDao userDao) {
this.userDao = userDao;
}
@Override
public 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/beans
http://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>
//因为map集合里面包括User引用,而User类中还有其他属性,所以需要进行注入,然后通过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.测试类
public class UserController { public static void main(String[] args) {
ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
UserService service = (UserService) context.getBean("userService");
service.sava();
}
}
结果当然显而易见了
本文内容总结:Spring-Bean依赖注入(引用数据类型和集合数据类型)
原文链接:https://www.cnblogs.com/kevinsvim/p/14614961.html
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