spring Bean的命名

每个Bean可以有一个或多个Id，我们把第一个id成为标识符，其余id叫做别名，这些id在ioc容器中必须唯一，bean id的命名约定如下。

   

bean id的命名方式：

配置全限定类名，唯一

示例：

定一个helloworld接口

package com.zto;public interface HelloWorld {    public void  sayHello();}

实现该接口

package com.zto.impl;import com.zto.HelloWorld;public class HelloWorldImpl implements HelloWorld {    @Override    public void sayHello() {        System.out.println("Hello World!!");    }}

定义一个spring的配置文件text.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:task="http://www.springframework.org/schema/task"    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"    xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd     http://www.springframework.org/schema/tx        http://www.springframework.org/schema/tx/spring-tx-4.0.xsd        http://www.springframework.org/schema/task       http://www.springframework.org/schema/task/spring-task-4.0.xsd     http://www.springframework.org/schema/context       http://www.springframework.org/schema/context/spring-context-4.1.xsd      http://code.alibabatech.com/schema/dubbo        http://code.alibabatech.com/schema/dubbo/dubbo.xsd"><bean class="com.zto.impl.HelloWorldImpl" ></bean></beans>

创建一个测试类：Main

package com.zto;import org.springframework.beans.factory.BeanFactory;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Main {    public static void main(String[] args) {        BeanFactory beanFactory =                 new ClassPathXmlApplicationContext("classpath*:test.xml");        HelloWorld hello = beanFactory.getBean(HelloWorld.class);        hello.sayHello();    }}

运行该方法，可以得到

2016-09-05 21:54:52 main INFO  support.ClassPathXmlApplicationContext:[578]:Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@694e1548: startup date [Mon Sep 05 21:54:52 CST 2016]; root of context hierarchy2016-09-05 21:54:52 main INFO  xml.XmlBeanDefinitionReader:[317]:Loading XML bean definitions from URL [file:/E:/workspace1/subscribecore-parents/subscribecore/wechat/target/classes/test.xml]Hello World!!

指定id，唯一

示例代码

java代码不变，修改text.xml配置文件

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:task="http://www.springframework.org/schema/task"    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"    xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd     http://www.springframework.org/schema/tx        http://www.springframework.org/schema/tx/spring-tx-4.0.xsd        http://www.springframework.org/schema/task       http://www.springframework.org/schema/task/spring-task-4.0.xsd     http://www.springframework.org/schema/context       http://www.springframework.org/schema/context/spring-context-4.1.xsd      http://code.alibabatech.com/schema/dubbo        http://code.alibabatech.com/schema/dubbo/dubbo.xsd">    <bean class="com.zto.impl.HelloWorldImpl" />    <bean id="helloworld" class="com.zto.impl.HelloWorldImpl" /></beans>

修改测试类：Main

package com.zto;import org.springframework.beans.factory.BeanFactory;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Main {    public static void main(String[] args) {        /*BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello = beanFactory.getBean(HelloWorld.class);        hello.sayHello();*/        syaHelloWroldById();    }    public static void syaHelloWroldById() {        BeanFactory bean = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello =bean.getBean("helloworld",HelloWorld.class);        hello.sayHello();    }}

同样运行的结果为：

2016-09-05 21:54:52 main INFO  support.ClassPathXmlApplicationContext:[578]:Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@694e1548: startup date [Mon Sep 05 21:54:52 CST 2016]; root of context hierarchy2016-09-05 21:54:52 main INFO  xml.XmlBeanDefinitionReader:[317]:Loading XML bean definitions from URL [file:/E:/workspace1/subscribecore-parents/subscribecore/wechat/target/classes/test.xml]Hello World!!

指定name，唯一

同上，只修改配置文件

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:task="http://www.springframework.org/schema/task"    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"    xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd     http://www.springframework.org/schema/tx        http://www.springframework.org/schema/tx/spring-tx-4.0.xsd        http://www.springframework.org/schema/task       http://www.springframework.org/schema/task/spring-task-4.0.xsd     http://www.springframework.org/schema/context       http://www.springframework.org/schema/context/spring-context-4.1.xsd      http://code.alibabatech.com/schema/dubbo        http://code.alibabatech.com/schema/dubbo/dubbo.xsd">    <bean class="com.zto.impl.HelloWorldImpl" />    <bean id="helloworld" class="com.zto.impl.HelloWorldImpl" />    <bean name="helloworldByName" class="com.zto.impl.HelloWorldImpl" /></beans>

修改测试类:Main

package com.zto;import org.springframework.beans.factory.BeanFactory;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Main {    public static void main(String[] args) {        /*BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello = beanFactory.getBean(HelloWorld.class);        hello.sayHello();*/        /*syaHelloWroldById();*/        syaHelloWroldByName();    }    public static void syaHelloWroldById() {        BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello =beanFactory.getBean("helloworld",HelloWorld.class);        hello.sayHello();    }    public static void syaHelloWroldByName() {        BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello =beanFactory.getBean("helloworldByName",HelloWorld.class);        hello.sayHello();    }}

指定id和name，唯一

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:task="http://www.springframework.org/schema/task"    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"    xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd     http://www.springframework.org/schema/tx        http://www.springframework.org/schema/tx/spring-tx-4.0.xsd        http://www.springframework.org/schema/task       http://www.springframework.org/schema/task/spring-task-4.0.xsd     http://www.springframework.org/schema/context       http://www.springframework.org/schema/context/spring-context-4.1.xsd      http://code.alibabatech.com/schema/dubbo        http://code.alibabatech.com/schema/dubbo/dubbo.xsd">    <bean class="com.zto.impl.HelloWorldImpl" />    <bean id="helloworld" class="com.zto.impl.HelloWorldImpl" />    <bean name="helloworldByName" class="com.zto.impl.HelloWorldImpl" />    <bean id="helloworldById" name="helloworldByName01" class="com.zto.impl.HelloWorldImpl" /></beans>

package com.zto;import org.springframework.beans.factory.BeanFactory;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Main {    public static void main(String[] args) {        /*BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello = beanFactory.getBean(HelloWorld.class);        hello.sayHello();*/        /*syaHelloWroldById();*/        /*syaHelloWroldByName();*/        syaHelloWroldByNameAndId();    }    public static void syaHelloWroldById() {        BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello =beanFactory.getBean("helloworld",HelloWorld.class);        hello.sayHello();    }    public static void syaHelloWroldByName() {        BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello =beanFactory.getBean("helloworldByName",HelloWorld.class);        hello.sayHello();    }    public static void syaHelloWroldByNameAndId() {        BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello =beanFactory.getBean("helloworldById",HelloWorld.class);        hello.sayHello();        HelloWorld hello2=beanFactory.getBean("helloworldByName01",HelloWorld.class);        hello.sayHello();    }}

指定多个name，唯一

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:task="http://www.springframework.org/schema/task"    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"    xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd     http://www.springframework.org/schema/tx        http://www.springframework.org/schema/tx/spring-tx-4.0.xsd        http://www.springframework.org/schema/task       http://www.springframework.org/schema/task/spring-task-4.0.xsd     http://www.springframework.org/schema/context       http://www.springframework.org/schema/context/spring-context-4.1.xsd      http://code.alibabatech.com/schema/dubbo        http://code.alibabatech.com/schema/dubbo/dubbo.xsd">    <bean class="com.zto.impl.HelloWorldImpl" />    <bean id="helloworld" class="com.zto.impl.HelloWorldImpl" />    <bean name="helloworldByName" class="com.zto.impl.HelloWorldImpl" />    <bean id="helloworldById" name="helloworldByName01" class="com.zto.impl.HelloWorldImpl" />    <bean name="bean1;alias11;alias12;alias13" class="com.zto.impl.HelloWorldImpl" />    <bean id="bean2" name="alias21;alias22;alias    23" class="com.zto.impl.HelloWorldImpl" /></beans>

package com.zto;import org.springframework.beans.factory.BeanFactory;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Main {    public static void main(String[] args) {        /*BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello = beanFactory.getBean(HelloWorld.class);        hello.sayHello();*/        /*syaHelloWroldById();*/        /*syaHelloWroldByName();*/        /*syaHelloWroldByNameAndId();*/        syaHelloWroldByMultiName();    }    public static void syaHelloWroldById() {        BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello =beanFactory.getBean("helloworld",HelloWorld.class);        hello.sayHello();    }    public static void syaHelloWroldByName() {        BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello =beanFactory.getBean("helloworldByName",HelloWorld.class);        hello.sayHello();    }    public static void syaHelloWroldByNameAndId() {        BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello =beanFactory.getBean("helloworldById",HelloWorld.class);        hello.sayHello();        HelloWorld hello2=beanFactory.getBean("helloworldByName01",HelloWorld.class);        hello.sayHello();    }    public static void syaHelloWroldByMultiName() {        BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld bean1= beanFactory.getBean("bean1",HelloWorld.class);        bean1.sayHello();        HelloWorld bean11= beanFactory.getBean("alias11",HelloWorld.class);        bean11.sayHello();        HelloWorld bean12= beanFactory.getBean("alias12",HelloWorld.class);        bean12.sayHello();        HelloWorld bean13= beanFactory.getBean("alias13",HelloWorld.class);        bean13.sayHello();        HelloWorld bean2= beanFactory.getBean("bean2",HelloWorld.class);        bean2.sayHello();        HelloWorld bean21= beanFactory.getBean("alias21",HelloWorld.class);        bean21.sayHello();        HelloWorld bean22= beanFactory.getBean("alias22",HelloWorld.class);        bean22.sayHello();        HelloWorld bean23= beanFactory.getBean("alias23",HelloWorld.class);        bean23.sayHello();    }}

指定别名，唯一

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:task="http://www.springframework.org/schema/task"    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"    xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd     http://www.springframework.org/schema/tx        http://www.springframework.org/schema/tx/spring-tx-4.0.xsd        http://www.springframework.org/schema/task       http://www.springframework.org/schema/task/spring-task-4.0.xsd     http://www.springframework.org/schema/context       http://www.springframework.org/schema/context/spring-context-4.1.xsd      http://code.alibabatech.com/schema/dubbo        http://code.alibabatech.com/schema/dubbo/dubbo.xsd">    <bean class="com.zto.impl.HelloWorldImpl" />    <bean id="helloworld" class="com.zto.impl.HelloWorldImpl" />    <bean name="helloworldByName" class="com.zto.impl.HelloWorldImpl" />    <bean id="helloworldById" name="helloworldByName01" class="com.zto.impl.HelloWorldImpl" />    <bean name="bean1;alias11;alias12;alias13" class="com.zto.impl.HelloWorldImpl" />    <bean id="bean2" name="alias21;alias22;alias    23" class="com.zto.impl.HelloWorldImpl" />    <bean id="bean3" class="com.zto.impl.HelloWorldImpl" />    <alias name="bean3" alias="alias31" />    <alias name="bean3" alias="alias32" /></beans>

package com.zto;import org.springframework.beans.factory.BeanFactory;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Main {    public static void main(String[] args) {        /*BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello = beanFactory.getBean(HelloWorld.class);        hello.sayHello();*/        /*syaHelloWroldById();*/        /*syaHelloWroldByName();*/        /*syaHelloWroldByNameAndId();*/        /*syaHelloWroldByMultiName();*/        syaHelloWroldByAlias();    }    public static void syaHelloWroldById() {        BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello =beanFactory.getBean("helloworld",HelloWorld.class);        hello.sayHello();    }    public static void syaHelloWroldByName() {        BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello =beanFactory.getBean("helloworldByName",HelloWorld.class);        hello.sayHello();    }    public static void syaHelloWroldByNameAndId() {        BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld hello =beanFactory.getBean("helloworldById",HelloWorld.class);        hello.sayHello();        HelloWorld hello2=beanFactory.getBean("helloworldByName01",HelloWorld.class);        hello.sayHello();    }    public static void syaHelloWroldByMultiName() {        BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld bean1= beanFactory.getBean("bean1",HelloWorld.class);        bean1.sayHello();        HelloWorld bean11= beanFactory.getBean("alias11",HelloWorld.class);        bean11.sayHello();        HelloWorld bean12= beanFactory.getBean("alias12",HelloWorld.class);        bean12.sayHello();        HelloWorld bean13= beanFactory.getBean("alias13",HelloWorld.class);        bean13.sayHello();        HelloWorld bean2= beanFactory.getBean("bean2",HelloWorld.class);        bean2.sayHello();        HelloWorld bean21= beanFactory.getBean("alias21",HelloWorld.class);        bean21.sayHello();        HelloWorld bean22= beanFactory.getBean("alias22",HelloWorld.class);        bean22.sayHello();        HelloWorld bean23= beanFactory.getBean("alias23",HelloWorld.class);        bean23.sayHello();    }    public static void syaHelloWroldByAlias() {        BeanFactory beanFactory = new ClassPathXmlApplicationContext(                "classpath*:test.xml");        HelloWorld bean3= beanFactory.getBean("bean3",HelloWorld.class);        bean3.sayHello();        HelloWorld alias31= beanFactory.getBean("alias31",HelloWorld.class);        alias31.sayHello();        HelloWorld alias32= beanFactory.getBean("alias32",HelloWorld.class);        alias32.sayHello();    }}

bean id 的命名约定

1、遵循XML命名规范

2、由字母、数字、下划线组成

3、驼峰式，首个单词的字母大写

bean id 的命名约定

1、遵循XML命名规范

2、由字母、数字、下划线组成

3、驼峰式，首个单词的字母大写