Spring Java @Configuration
@Configuration注解可从上一章Spring.Ioc中了解到，在annotation包下的ConfigAnnotation.java，即使用了@Configuration、@ComponentScan两个注解，实现了Spring applicationContext.xml的配置文件功能，而代码其意可以理解为：
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| package annotation;
package annotation;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
@ComponentScan("annotation")
public class ConfigAnnotation {
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其中@Configuration将ConfigAnnotation.java成为了一个配置类，根据@Configuration注解，可让ConfigAnnotaation.java类成为相当于Spring XML中的配置文件。而@ComponentScan注解实现了Spring XML配置文件的语法“<context:component - scan base -package="Bean 包路径”/> “
Dao
Java Spring TestDao.java
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| package annotation.dao;
public interface TestDao {
public void save();
}
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Spring IoC TestDao.java
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| package annotation.dao;
public interface TestDao {
public void save();
}
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Service
Java Spring TestServce
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| package service;
import dao.TestDao;
public class TestService {
TestDao testDao;
public void setTestDao (TestDao testDao) {
this.testDao = testDao;
}
public void save() {
testDao.save();
}
}
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Spring IoC TestService
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| package annotation.service;
public interface TestService {
public void save();
}
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javaConfig
JavaConfig.java
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| package javaConfig;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import controller.TestController;
import dao.TestDao;
import service.TestService;
@Configuration
public class JavaConfig {
@Bean
public TestDao getTestDao() {
return new TestDao();
}
@Bean
public TestService getTestService() {
TestService testservice = new TestService();
testservice.setTestDao(getTestDao());
return testservice;
}
@Bean
public TestController getTestController() {
TestController testcontroller = new TestController();
testcontroller.setTestService(getTestService());
return testcontroller;
}
}
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TestConfig.java
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| package javaConfig;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import controller.TestController;
public class TestConfig {
public static void main (String args[]) {
AnnotationConfigApplicationContext annotationconfigapplicationcontext =
new AnnotationConfigApplicationContext(JavaConfig.class);
TestController testcontroller = annotationconfigapplicationcontext.getBean(TestController.class);
testcontroller.save();
annotationconfigapplicationcontext.close();
}
}
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从Spring Java 与Spring IoC 来相比，Spring Java在类的方面很明显比Spring IoC少了一个类，但相比之下Java Script的代码比Spring IoC少了许多。但Java Script @Bean注解来完成@ComponentScan自动扫描的功能与服务。
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