我已经测试了自动接线的行为,以防上下文:andotation-config元素在应用程序上下文xml文件中缺少。令我惊讶的是,它也一样。
所以这是我的问题:即使上下文中的上下文:Anpertation-config元素在应用程序上下文配置文件中缺少AutoWirediredAnnotationBeanBeanPostProcestor,即使在应用程序上的context中注册,或者其他机制使此配置起作用?
我正在使用春季版3.0.6.Release这是项目pom文件:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven- v4_0_0.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<groupId>org.springframework.samples.spring</groupId>
<artifactId>spring-utility</artifactId>
<version>1.0.0.CI-SNAPSHOT</version>
<packaging>jar</packaging>
<name>Spring Utility</name>
<url>http://www.springframework.org</url>
<description>
<![CDATA[
This project is a minimal jar utility with Spring configuration.
]]>
</description>
<properties>
<maven.test.failure.ignore>true</maven.test.failure.ignore>
<spring.framework.version>3.0.6.RELEASE</spring.framework.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.7</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.framework.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.framework.version}</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.5</source>
<target>1.5</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
这是应用程序上下文配置文件,带有上下文:注释 - config元素评论:
<?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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<description>Example configuration to get you started.</description>
<!-- context:annotation-config/ -->
<context:component-scan base-package="com.foo.ch04" />
</beans>
一个消息传播者,将被依赖的bean Messagererer用作合作者
package com.foo.ch04.helloworld;
import org.springframework.stereotype.Service;
@Service("messageProvider")
public class HelloWorldMessageProvider implements MessageProvider {
public String getMessage() {
return "Hello, World!";
}
}
Messagerenderer,其依赖性messageProvider被自动注入:
package com.foo.ch04.helloworld;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service("messageRenderer")
public class StandardOutMessageRenderer implements MessageRenderer {
private MessageProvider messageProvider;
public void render() {
if (messageProvider == null) {
throw new RuntimeException(
"You must set the property messageProvider before rendering message.");
}
System.out.println(messageProvider.getMessage());
}
@Autowired
public void setMessageProvider(MessageProvider provider) {
messageProvider = provider;
}
public MessageProvider getMessageProvider() {
return messageProvider;
}
}
测试应用程序加载应用程序上下文并测试Messagerender:
package com.foo.ch04.helloworld;
import org.springframework.context.support.GenericXmlApplicationContext;
public class DeclareSpringComponents {
public static void main(String[] args) {
GenericXmlApplicationContext context = new GenericXmlApplicationContext();
context.load("classpath:META-INF/spring/app-context-annotation.xml");
context.refresh();
MessageRenderer renderer = context.getBean("messageRenderer",
MessageRenderer.class);
renderer.render();
}
}
即使应用程序上下文配置文件中缺少的消息,消息" Hello,World!"运行应用程序时写信给Stdout。
使用<context:component-scan />
意味着基于注释的配置,因此指定<context:annotation-config/>
是多余的。
'上下文:注释config'此注释config标签用于处理应用程序上下文XML文件中声明的自动有线bean。如果可以使用"上下文:组件 - 扫描"标签的范围来发现自动有线bean,则无需使用'上下文:注释config'tag