UserDAOImpl.java:
package com.bjsxt.dao.impl; import com.bjsxt.dao.UserDAO; import com.bjsxt.model.User; public class UserDAOImpl implements UserDAO { private int daoId; public int getDaoId() { return daoId; } public void setDaoId(int daoId) { this.daoId = daoId; } public void save(User user) { //Hibernate //JDBC //XML //NetWork System.out.println("user saved!"); } @Override public String toString() { return "daoId=" + daoId; } }
UserService.java:
package com.bjsxt.service; import com.bjsxt.dao.UserDAO; import com.bjsxt.model.User; public class UserService { private UserDAO userDAO; public void add(User user) { userDAO.save(user); } public UserDAO getUserDAO() { return userDAO; } public void setUserDAO(UserDAO userDAO) { this.userDAO = userDAO; } }
UserServiceTest.java:
package com.bjsxt.service; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.bjsxt.model.User; //Dependency Injection //Inverse of Control public class UserServiceTest { @Test public void testAdd() throws Exception { ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); UserService service = (UserService)ctx.getBean("userService"); System.out.println(service.getUserDAO()); } }
bean.xml:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd" > <bean name="userDAO" class="com.bjsxt.dao.impl.UserDAOImpl"> <property name="daoId" value="1"></property> </bean> <bean name="userDAO2" class="com.bjsxt.dao.impl.UserDAOImpl"> <property name="daoId" value="2"></property> </bean> <bean id="userService" class="com.bjsxt.service.UserService" scope="prototype" autowire="byName"> </bean> </beans>
结果: daoId=1
bean.xml改成如下:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd" > <bean name="userDAO2" class="com.bjsxt.dao.impl.UserDAOImpl"> <property name="daoId" value="2"></property> </bean> <bean id="userService" class="com.bjsxt.service.UserService" scope="prototype" autowire="byType"> </bean> </beans>
结果: daoId=2