有關spring的註解,今天瞭解了下,現在一方面做下學習總結,另一方面給學習的筒子做個借鑑。
spring提供相關的幾個Annotation來標註bean先列出來
@Component:標註一個普通的spring bean
@Controller:標註一個控制器組件類如action
@Service:標註一個邏輯控制類如Service層
@Repository:標註一個持久層Dao組件類
再列幾個
@Scope:相信大家對這個不陌生吧,表示bean的作用域,使用方式:Scope("prototype")
@Resource:配合依賴,使用方式:Resource(name="XXXX")等同於xml中的配置<property …… ref="XXXX" />
@Autowired:自動裝配,默認按照type裝配,如果需要按照name裝配就需要和下面的相結合了
@Qualifier
針對自動裝配下面展示兩種寫法分別表示屬性修飾和set方式修飾:
@Autowried
@Qualifier("XXXX")
private XXXX xxxx;
-----------------------------------------------------
@Autowried
public void setXXX(@Qualifier("xxxx") XXX xxx){}
基本常用的註解也就上面的了,現在貼上代碼:
要想讓註解生效,首先要在配置文件中指明掃描那些包下的Bean類,
包結構:
cn.life.routine
-action
-dao
-service
引入ContextSchema,spring配置
- <?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 <a href="http://www.springframework.org/schema/context/spring-context-3.0.xsd">http://www.springframework.org/schema/context/spring-context-3.0.xsd</a>"
- >
- <!-- action暫未用註解 -->
- <bean id="NoticeAction" class="cn.life.routine.action.NoticeAction" scope="prototype" ></bean>
- <!-- 註解測試,routine -->
- <context:component-scan base-package="cn.life.routine"></context:component-scan>
- </beans>
現在依次貼出service,dao
service接口
- /**
- * 註解
- * @author Francis.Hu
- * @createDate Oct 21, 2012
- */
- public interface TestService {
- /**
- * 註解測試
- * @return
- */
- public String getTestAnnotation();
- }
service實現類
- package cn.life.routine.service;
- import org.springframework.beans.factory.annotation.Autowired;
- import org.springframework.beans.factory.annotation.Qualifier;
- import org.springframework.stereotype.Service;
- import cn.life.routine.dao.TestDao;
- /**
- * 註解測試
- * @author Francis.Hu
- * @createDate Oct 21, 2012
- */
- @Service("testService")
- public class TestServiceImp implements TestService{
- /**
- * 自動裝配
- */
- @Autowired
- @Qualifier("testDao")
- //@Resource(name="testDao"), 等價於<property ………… ref="testDao" />
- private TestDao testDao;
- public String getTestAnnotation() {
- return testDao.getTestDaoAnnotation();
- }
- public TestDao getTestDao() {
- return testDao;
- }
- public void setTestDao(TestDao testDao) {
- this.testDao = testDao;
- }
- }
dao層接口
- /**
- * 測試註解
- * @author Francis.Hu
- * @createDate Oct 21, 2012
- */
- public interface TestDao {
- /**
- * 得到dao層註解
- * @return
- */
- public String getTestDaoAnnotation();
- }
dao層實現類
- /**
- * 測試註解
- * @author Francis.Hu
- * @createDate Oct 21, 2012
- */
- @Repository("testDao")
- public class TestDaoImpl implements TestDao {
- public String getTestDaoAnnotation() {
- return "This is testDao Annotation";
- }
- }
下面是action中的調用
- /**
- * 測試註解
- * @return
- */
- @Resource(name="testService")
- private TestService testService;
- public String testAnnotation(){
- String result = testService.getTestAnnotation();
- System.out.println(result);
- return SUCCESS;
- }
- public TestService getTestService() {
- return testService;
- }
- public void setTestService(TestService testService) {
- this.testService = testService;
- }
- /*********************測試結束******************************/