spring4笔记----使用装配注入合作者Bean的三种方式

no ：不自动装配
byName ：id（name）与setter方法去set前缀，并小写首字母后同名的Bean完成注入，如有多个匹配则抛异常
byType ：spring容器找全部bean，如果找到单单一个bean类型和setter方法形参类型匹配的则完成注入，如有多个匹配则抛异常

两个名字相同抛异常情况例子：

Exception in thread "main" org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Bean name 'd' is already used in this <beans> element

Offending resource: class path resource [beans.xml]

    at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:70)

    at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85)

    at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:80)

    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.error(BeanDefinitionParserDelegate.java:301)

    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.checkNameUniqueness(BeanDefinitionParserDelegate.java:511)

    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseBeanDefinitionElement(BeanDefinitionParserDelegate.java:457)

    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseBeanDefinitionElement(BeanDefinitionParserDelegate.java:429)

    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.processBeanDefinition(DefaultBeanDefinitionDocumentReader.java:299)

    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseDefaultElement(DefaultBeanDefinitionDocumentReader.java:190)

    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:169)

    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:142)

    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:94)

    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:508)

    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:392)

    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336)

    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304)

    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:181)

    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:217)

    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:188)

    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:252)

    at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:127)

    at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:93)

    at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)

    at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:612)

    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:513)

    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)

    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)

    at com.ij34.bean.test.main(test.java:12)

接口

package com.ij34.interfaces;

public interface dog {

 public String run();

}

package com.ij34.interfaces;

public interface people {

   public void test();

}

对象

package com.ij34.servce;

import com.ij34.interfaces.dog;

public class Dog implements dog{

   private String name;

public String getName() {

    return name;

}

public void setName(String name) {

    this.name = name;

}

@Override

public String run() {

    // TODO Auto-generated method stub

    return "我是一只阿拉斯加狗，名字叫："+getName();

}

}

package com.ij34.servce;

import com.ij34.interfaces.dog;

public class Dog2 implements dog{

   private String name;

public String getName() {

    return name;

}

public void setName(String name) {

    this.name = name;

}

@Override

public String run() {

    // TODO Auto-generated method stub

    return "我是一只哈奇士狗，名字叫："+getName();

}

}

package com.ij34.servce;

import com.ij34.interfaces.dog;

import com.ij34.interfaces.people;

public class People implements people{

  private dog d;

    public dog getD() {

    return d;

}

public void setD(dog d) {

    this.d = d;

}

    @Override

    public void test() {

        // TODO Auto-generated method stub

        System.out.println("我是程序员："+getD().run());

    }

}

<?xml version="1.0" encoding="GBK"?>

<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-4.3.xsd">

<bean id="chinese" class="com.ij34.servce.People" autowire="byName" />  <!-- 或者byType -->

<bean name="d" class="com.ij34.servce.Dog" >

<property name="name" value="牛仔1"></property>

</bean>

<bean name="d1" class="com.ij34.servce.Dog2" >  <!-- 多个，另外的里面添加: autowire-candidate="false"-->

<property name="name" value="大哈2狗"></property>

</bean>

</beans>

运行

package com.ij34.bean;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.ij34.servce.People;

public class test {

    public static void main(String[] args) {

        // TODO Auto-generated method stub

          @SuppressWarnings("resource")

        ApplicationContext app=new ClassPathXmlApplicationContext("beans.xml");

        People p=app.getBean("chinese", People.class);

        p.test();

    }

}

巴特西

spring4笔记----使用装配注入合作者Bean的三种方式

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