问题描述

关于spring xml配置中的c命名空间和p命名空间的问题

<?xml version=""1.0"" encoding=""UTF-8""?>

xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance""
xmlns:c=""http://www.springframework.org/schema/c""
xsi:schemaLocation=""http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"">

c:age=""29"" c:axe-ref=""stoneAxe""/>

package com.app.service;

public interface Person {
public void useAxe();

}
package com.app.service;

public interface Axe {
public String chop();

}
package com.app.service.impl;

import com.app.service.Axe;

public class StoneAxe implements Axe {

public String chop() {    return ""石斧头砍柴好慢"";}

}
package com.app.service.impl;

import com.app.service.Axe;

public class SteelAxe implements Axe{

public String chop() {    return ""钢斧头真快"";}

}
package com.app.service.impl;

import com.app.service.Axe;
import com.app.service.Person;

public class Chinese implements Person {
private Axe axe;
private int age;

public  Chinese(Axe axeint age){    this.axe = axe;    this.age = age;}public void useAxe() {    System.out.println(axe.chop());    System.out.println(""age成员变量的值："" + age);}

}
package com.app.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import com.app.service.Person;

public class SpringTest {
public static void main(String[] args) {
ApplicationContext ctx = new AnnotationConfigApplicationContext(""beans.xml"");
Person p = ctx.getBean(""chinese""Person.class);
p.useAxe();
}

}
运行测试类报错如下：
log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment).
log4j:WARN Please initialize the log4j system properly.
Exception in thread ""main"" org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'chinese' is defined
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:641)
at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1157)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:280)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:198)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:979)
at com.app.test.SpringTest.main(SpringTest.java:11)

解决方案

<beans
xmlns=""http://www.springframework.org/schema/beans""
xmlns:xsi=""http://www.springframework.org/2001/XMLSchema-instance""

xmlns:p=""http://www.springframework.org/schema/p""x......<br/><strong>答案就在这里：</strong><a target='_blank' rel='nofollow' href='http://blog.csdn.net/wangxiangmingtian/article/details/9230663'>Spring 命名空间 p</a><br/>

解决方案二：
试试把Person这个类 创建一个bean节点

在测试类里面直接用

Person p = ctx.getBean(""chinese"");

解决方案三：
Spring的2.5版本中提供了一种:p名称空间的注入:

 * 引入p名称空间:<beans xmlns=""http://www.springframework.org/schema/beans""          xmlns:p=""http://www.springframework.org/schema/p""       xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance""       xsi:schemaLocation=""http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"">* 使用p名称空间注入:* 语法格式:* p:属性名=””* p:属性名-ref=””    <bean id=""car2"" class=""com.itheima.spring.demo5.Car2"" p:name=""长安奔奔"" p:price=""40000""/><bean id=""employee"" class=""com.itheima.spring.demo5.Employee"" p:name=""隔壁老王"" p:car2-ref=""car2""></bean>