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

巴特西

Spring-Bean依赖注入(引用数据类型和集合数据类型）

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