从头认识Spring-1.10 使用命名空间p来注入属性

Posted 2020-06-13 李灵晖

这一章节我们来介绍一下使用命名空间p来注入属性。

1.domain

蛋糕类：（不变）

package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_10;

public class Cake {

	private final int id = index++;

	private static int index = 0;

	private String name = "";

	private double size = 0;

	public String getName() {
		return name;
	}

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

	public double getSize() {
		return size;
	}

	public void setSize(double size) {
		this.size = size;
	}

	public int getId() {
		return id;
	}

	@Override
	public String toString() {
		return "create the cake,its id:" + id + ", size:" + size + " inch ,name:" + name;
	}
}

厨师类：

注意：配置文件使用命名空间p，不能具有相同属性注入的构造器

package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_10;

public class Chief {

	private static int index = 0;

	private Cake cake = null;

	private final int id = index++;

	private String name = "";

	//配置文件使用命名空间p，不能有下面的构造器
	// public Chief(String name, Cake cake) {
	// this.name = name;
	// this.cake = cake;
	// }

	public Cake getCake() {
		return cake;
	}

	public int getId() {
		return id;
	}

	public String getName() {
		return name;
	}

	public Cake makeOneCake() {
		return cake;
	}

	public void setCake(Cake cake) {
		this.cake = cake;
	}

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

}

2.测试类：（不变）

package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_10;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {
		"/com/raylee/my_new_spring/my_new_spring/ch01/topic_1_10/ApplicationContext-test.xml" })
public class ChiefTest {

	@Autowired
	private ApplicationContext applicationContext;

	@Test
	public void testChief() {
		Chief chief = applicationContext.getBean(Chief.class);
		System.out.println("chief name:" + chief.getName());
		System.out.println(chief.getName() + " make a cake ,cake's name :" + chief.makeOneCake());
	}
}

3.配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd
		http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

	<bean id="cake"
		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_10.Cake"
		p:name="jack's own cake" p:size="7" />
	<bean id="chief"
		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_10.Chief"
		p:name="jack" p:cake-ref="cake" />
</beans>

有三点需要注意：

（1）p后面的名称首字母不区分大小写

也就是说：

<bean id="chief"
		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_10.Chief"
		p:name="jack" p:cake-ref="cake" />

和

<bean id="chief"
		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_10.Chief"
		p:Came="jack" p:Cake-ref="cake" />

功能相同

（2）命名空间p与property属性可以混合使用

也就是说：

<bean id="cake"
		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_10.Cake"
		p:Name="jack's own cake">
		<property name="size" value="7"></property>
	</bean>

总结：这一章节我们主要介绍了使用命名空间p来注入属性。

目录：http://blog.csdn.net/raylee2007/article/details/50611627 

 

我的github：https://github.com/raylee2015/my_new_spring