Spring笔记(四)--公共属性的配置

一、公共属性的注入配置：

四个bean：

package com.dwr.spring.bean;

public class Bean1 {
    private Bean2 bean2;
    private Bean3 bean3;
    private Bean4 bean4;

    public Bean2 getBean2() {
        return bean2;
    }

    public void setBean2(Bean2 bean2) {
        this.bean2 = bean2;
    }

    public Bean3 getBean3() {
        return bean3;
    }

    public void setBean3(Bean3 bean3) {
        this.bean3 = bean3;
    }

    public Bean4 getBean4() {
        return bean4;
    }

    public void setBean4(Bean4 bean4) {
        this.bean4 = bean4;
    }
}

package com.dwr.spring.bean;

public class Bean2 {
    private int id;
    private String name;
    private String password;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

package com.dwr.spring.bean;

public class Bean3 {
    private int id;
    private String name;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

package com.dwr.spring.bean;

public class Bean4 {
    private int age;

    public int getAge() {
        return age;
    }

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

spring.xml

　　<bean id="bean1" class="com.dwr.spring.bean.Bean1">
        <property name="bean2" ref="bean2"/>
        <property name="bean3" ref="bean3"/>
        <property name="bean4" ref="bean4"/>
    </bean>
    <bean id="bean2" class="com.dwr.spring.bean.Bean2">
        <property name="id" value="1"/>
        <property name="name" value="Jack"/>
        <property name="password" value="123456"/>
    </bean>
    <bean id="bean3" class="com.dwr.spring.bean.Bean3">
        <property name="id" value="1"/>
        <property name="name" value="Jack"/>
    </bean>
    <bean id="bean4" class="com.dwr.spring.bean.Bean4">
        <property name="age" value="20"/>
    </bean>

测试：

@org.junit.Test
    public void testMethod(){
        ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
        Bean1 bean1 = (Bean1) context.getBean("bean1");

        System.out.println("bean1.getBean2().getId():" + bean1.getBean2().getId());
        System.out.println("bean1.getBean2().getName():" + bean1.getBean2().getName());
        System.out.println("bean1.getBean2().getPassword():" + bean1.getBean2().getPassword());
        System.out.println("bean1.getBean3().getId():" + bean1.getBean3().getId());
        System.out.println("bean1.getBean3().getName():" + bean1.getBean3().getName());
        System.out.println("bean1.getBean4().getAge():" + bean1.getBean4().getAge());

    }

测试结果：

bean1.getBean2().getId():1
bean1.getBean2().getName():Jack
bean1.getBean2().getPassword():123456
bean1.getBean3().getId():1
bean1.getBean3().getName():Jack
bean1.getBean4().getAge():20

bean2和bean3的部分属性配置信息相同，因此可以将公共部分提出来。xml文件配置如下：

　　<bean id="beanAbstract" abstract="true">
        <property name="id" value="1"/>
        <property name="name" value="Jack"/>
    </bean>
    <bean id="bean1" class="com.dwr.spring.bean.Bean1">
        <property name="bean2" ref="bean2"/>
        <property name="bean3" ref="bean3"/>
        <property name="bean4" ref="bean4"/>
    </bean>
    <bean id="bean2" class="com.dwr.spring.bean.Bean2" parent="beanAbstract">
        <property name="password" value="123456"/>
    </bean>
    <bean id="bean3" class="com.dwr.spring.bean.Bean3" parent="beanAbstract"></bean>
    <bean id="bean4" class="com.dwr.spring.bean.Bean4">
        <property name="age" value="20"/>
    </bean>

beanAbstract是抽象出来的，令abstract="true"后，可以不指定class属性。

测试结果与上面相同。

若bean2的name不同，则可以在配置bean2是声明(配置property)。