spring学习（三）属性注入

用的是IDEA的maven工程，pom.xml文件导包依赖省略

本文主要写set方式注入

（一）、一般类型注入

一、写两个实体类Car、User

public class Car {
    private String color;
    private String carName;

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public String getCarName() {
        return carName;
    }

    public void setCarName(String carName) {
        this.carName = carName;
    }

    @Override
    public String toString() {
        return "Car{" +
                "color='" + color + '\'' +
                ", carName='" + carName + '\'' +
                '}';
    }
}

public class User {
    private String name;
    private Integer age;
    
    private Car car;
    
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Car getCar() {
        return car;
    }

    public void setCar(Car car) {
        this.car = car;
    }

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", car=" + car +
                '}';
    }
}

二、书写配置文件applicationContext.xml（由于用的是IDEA，配置文件放在resources文件夹中），并注意约束的导入

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd ">

    <!--set方式注入-->
    <bean name="user" class="dyh.so.User">
        <!--为User对象的name与age注入Lily和12-->
        <property name="name" value="lily"></property>
        <property name="age" value="12"></property>
        <!--为car属性注入下面的car对象-->
        <property name="car" ref="car"></property>

    </bean>

    <bean name="car" class="dyh.so.Car">
        <!--为Car对象注入属性值-->
        <property name="carName" value="兰博基尼"></property>
        <property name="color" value="red"></property>
    </bean>
</beans>

三、测试

import dyh.so.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

    @Test
    public void fun(){
        //1、创建容器对象
        ApplicationContext ct = new ClassPathXmlApplicationContext("applicationContext.xml");
        //2、向容器要User对象
        User user = (User) ct.getBean("user");
        //3、打印在容器中获得的对象
        System.out.println(user);
    }
}

测试结果：

 

（二）、复杂类型注入

一、写出要注入的实体类

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Properties;

public class CollectionBean {
    private List list;//list/set 类型注入
    private Map map;//map类型注入
    private Properties prop;//properties类型注入


    public List getList() {
        return list;
    }

    public void setList(List list) {
        this.list = list;
    }

    public Map getMap() {
        return map;
    }

    public void setMap(Map map) {
        this.map = map;
    }

    public Properties getProp() {
        return prop;
    }

    public void setProp(Properties prop) {
        this.prop = prop;
    }

    @Override
    public String toString() {
        return "CollectionBean{" +
                ", list=" + list +
                ", map=" + map +
                ", prop=" + prop +
                '}';
    }
}

二、书写配置文件applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd ">

    <!--set方式注入-->
    <bean name="user" class="dyh.so.User">
        <!--为User对象的name与age注入Lily和12-->
        <property name="name" value="lily"></property>
        <property name="age" value="12"></property>
        <!--为car属性注入下面的car对象-->
        <property name="car" ref="car"></property>

    </bean>

    <bean name="car" class="dyh.so.Car">
        <!--为Car对象注入属性值-->
        <property name="carName" value="兰博基尼"></property>
        <property name="color" value="red"></property>
    </bean>


<!--复杂类型注入-->

    <bean name="collbean" class="dyh.ss.CollectionBean">
        <!--list 注入-->
        <property name="list">
            <list>
                <value>张三</value>
                <value>李四</value>
                <ref bean="car"/>
                <ref bean="user"/>
            </list>
        </property>

        <!--map注入-->
        <property name="map">
            <map>
                <entry key="1" value="一"></entry>
                <entry key="2" value="二"></entry>
                <entry key="3" value="三"></entry>
                <entry key-ref="user" value-ref="car"></entry>
            </map>
        </property>

        <!-- prperties 类型注入 -->
        <property name="prop"  >
            <props>
                <prop key="driverClass">com.jdbc.mysql.Driver</prop>
                <prop key="userName">root</prop>
                <prop key="password">1234</prop>
            </props>
        </property>
    </bean>
</beans>

 

三、测试

 @Test
    public void fun2(){
        //创建容器
        ApplicationContext ct = new ClassPathXmlApplicationContext("applicationContext.xml");
        //向容器中要ConnectionBean对象
        Object collbean = ct.getBean("collbean");

        //打印出来在spring中获得的对象
        System.out.println(collbean);
    }

测试结果