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

巴特西

spring学习（三）属性注入

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