• 从头认识Spring-1.7 如何通过属性注入Bean?(1)-如何通过属性向对象注入值?


    这一章节我们来讨论一下如何通过属性注入Bean?

    这一章节分为两部分,第一部分我们通过属性向对象注入值,第二部分我们通过属性向对象注入还有一个对象的引用。

    1.如何通过属性向对象注入值?

    (1)domain

    package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_7;
    
    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;
    	}
    }
    


    这一个领域类我们仅仅须要一个Cake就够了。可是我们在里面会加上名称(name)和大小(size)这两个属性,然后我们通过Spring来帮我们赋值。

    (2)測试类:

    package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_7;
    
    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_7/ApplicationContext-test.xml" })
    public class CakeTest {
    
    	@Autowired
    	private ApplicationContext applicationContext;
    
    	@Test
    	public void testChief() {
    		Cake cake = applicationContext.getBean(Cake.class);
    		System.out.println(cake.getId());
    		System.out.println(cake.getName());
    		System.out.println(cake.getSize());
    	}
    }
    


    没什么特别。仅仅须要get那个Bean出来,然后打印一下几个属性就可以。

    (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: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_7.Cake"> <property name="name" value="Blueberry Cheesecake" /> <property name="size" value="7" /> </bean> </beans>


    配置文件比較重要,我们在Bean里面须要插入property这个标签,然后name这个属性须要跟我们的domain类的属性名字一样。

    注意:这里首字母能够不区分大写和小写

    也就是

    <bean id="cake"
    		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_7.Cake">
    		<property name="Name" value="Blueberry Cheesecake" />
    		<property name="Size" value="7" />
    	</bean>


    <bean id="cake"
    		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_7.Cake">
    		<property name="name" value="Blueberry Cheesecake" />
    		<property name="size" value="7" />
    	</bean>


    是一样的

     可是像以下的全然的大写,就会抛异常

    <bean id="cake"
    		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_7.Cake">
    		<property name="NAME" value="Blueberry Cheesecake" />
    		<property name="SIZE" value="7" />
    	</bean>


     

    測试输出:

    0
    Blueberry Cheesecake
    7.0

    总结:这一章节主要介绍了如何通过属性向对象注入值,还有中间须要注意的大写和小写的问题

    文件夹:http://blog.csdn.net/raylee2007/article/details/50611627 

     

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

  • 相关阅读:
    换行符 CR
    c# 定义的属性名与保留关键字冲突
    Redis 以window 服务启动
    c# Guid.NewGuid().ToString(format
    select 下拉源动态赋值
    html 控制input标签只能输入数字
    HTTP 错误 500.19
    Android debugger 出现提示Connected to the target VM, address: 'localhost:xxxx', transport: 'socket'
    siege--Web性能压测工具
    python+selenium上传文件注意点
  • 原文地址:https://www.cnblogs.com/gccbuaa/p/7249788.html
Copyright © 2020-2023  润新知