spring自動裝配

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1. 

自動裝配: byName或byType

2. spring.xml中設定全域是byName自動裝配

<?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:p="http://www.springframework.org/schema/p"    xmlns:context="http://www.springframework.org/schema/context"    xsi:schemaLocation="        http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context.xsd" default-autowire="byName"><!-- ###############自動裝配############### -->  <bean id="userDao" class="cn.itcast.d_auto.UserDao"></bean><bean id="userService" class="cn.itcast.d_auto.UserService"></bean><!-- 如果根據類型自動裝配： 必須確保IOC容器中只有一個該類型的對象 --><bean id="userAction" class="cn.itcast.d_auto.UserAction"></bean><!--   報錯： 因為上面已經有一個該類型的對象，且使用了根據類型自動裝配<bean id="userService_test" class="cn.itcast.d_auto.UserService" autowire="byType"></bean> --></beans>      

　　3.測試類別

public class App {// 建立容器物件private ApplicationContext ac = new ClassPathXmlApplicationContext("cn/itcast/d_auto/bean.xml");@Testpublic void testExecuteAction() {// 從容器中擷取ActionUserAction userAction = (UserAction) ac.getBean("userAction");userAction.execute();}}

　　4. 控制層

public class UserAction {private UserService userService;public void setUserService(UserService userService) {this.userService = userService;}public String execute() {userService.save();return null;}}

　　5. 商務邏輯

public class UserService {private UserDao userDao; // = new UserDao();public void setUserDao(UserDao userDao) {this.userDao = userDao;}public void save() {userDao.save();}}

　　6.持久層

public class UserDao {public void save() {System.out.println("DB:儲存使用者...");}}

　　

 

spring自動裝配