1.設(shè)置注入

先寫demo代碼

Uer.java

public class User {private String username;private String password;public String getUsername(){return this.username;}public void setUsername(String name){this.username = name;}public String getPassword(){return this.password;}public void setPassword(String password){this.password = password;} }UserADO 接口：

public interface UerDAO{public void save(User user); }UserADOImpl類：

public class UserADOImpl implements UserADO {public void save(User user){System.out.println(user.getUsername() + user.getPassword());} }
ADO層是直接和DB打交道，這一層和mybatis或者h(yuǎn)ibernate結(jié)合；我們還要基于ADO創(chuàng)建service層。web工程中，一般分為ADO,service和web等，ADO負(fù)責(zé)數(shù)據(jù)的持久化，service負(fù)責(zé)業(yè)務(wù)，web層負(fù)責(zé)UI視圖和用戶交互。

UserService接口：

public interface UserService {public void add(User user); }UserServiceImpl類

public class UserServiceImpl implements UserService {private UserDAO userDAO;public void add(User user){userDAO.save(user);}public UserDAO getUserDAO(){return this.userDAO}public void setUserDAO(UserDAO userDAO){this.userDAO = userDAO;}}

配置文件 beans.xml，注入方式關(guān)鍵是在配置文件中配置的！！！！！

<?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:aop="http://www.springframework.org/schema/aop"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-3.0.xsd"><!-- 注冊一個 UserDAOImpl 對象實例--><bean id="u" class="com.deciphering.dao.impl.UserDAOImpl"></bean><!-- 注冊一個 UserServiceImpl 對象實例--><bean id="userService" class="com.deciphering.dao.service.UserServiceImpl"><!-- 將UserDAOImpl u 對象實例 注入到 UserServiceImpl 中的userDAO --><property name="userDAO"><ref bean="u"></property></bean></beans>

創(chuàng)建測試Junit ?用例類 UserServiceTest：

public class UserServiceTest{@Testpublic void testAdd() throw Exception{ApplicationContext ctx =new ClassPathXmlApplicationContext("beans.xml");UserServiceImpl service = (UserServiceImpl) stx.getBean("userService");User u = new User();u.setUsername("測試用戶");u.setPassword("123456");service.add(u);}}
2.構(gòu)造方式 注入

修改UserServiceImpl.java ?增加構(gòu)造方法

public class UserServiceImpl implements UserService {private UserDAO userDAO;public UserServiceImpl(UserDAO userDAO){super();this.UserDAO = UserDAO;}public void add(User user){userDAO.save(user);}public UserDAO getUserDAO(){return this.userDAO}public void setUserDAO(UserDAO userDAO){this.userDAO = userDAO;} }
beans.xml修改
<?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:aop="http://www.springframework.org/schema/aop"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-3.0.xsd"><!-- 注冊一個 UserDAOImpl 對象實例--><bean id="u" class="com.deciphering.dao.impl.UserDAOImpl"></bean><!-- 注冊一個 UserServiceImpl 對象實例--><bean id="userService" class="com.deciphering.dao.service.UserServiceImpl"><!-- 構(gòu)造方式 將UserDAOImpl u 對象實例 注入到 UserServiceImpl 中的userDAO --><constructor-arg><ref bean="u"></constructor-arg></bean></beans>
3.接口注入，我們需要特定的接口交給特定的類去注入，這種方式，帶來污染，不能完全解耦?，F(xiàn)在已被拋棄

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