如何使用Spring模拟注册功能？---XML方式配置

待我称王封你为后i 2023-03-14 13:28 60阅读 0赞

## 模拟注册功能 ##

此功能重点在于将每一层对象的创建交给Spring管理,对象之间的依赖关系交给Spring来维护

##### Dao层接口以及实现代码 #####

--------------------dao------------------
    public interface UserDao {
        
    	void insert(User user);
    }
    ------------------dao实现类-----------------
    public class UserDaoImpl implements UserDao {
        
    	
    	private DataSource dataSource;
    	
    	public void setDataSource(DataSource dataSource) {
        
    		this.dataSource = dataSource;
    	}
    	@Override
    	public void insert(User user) {
        
    		try {
        
    			//获取连接对象
    			Connection conn = dataSource.getConnection();
    			System.out.println("conn :"+conn);
    			System.out.println("user :"+user);
    		} catch (SQLException e) {
        
    			e.printStackTrace();
    		}
    	}
    }

##### Service层接口以及实现代码 #####

----------------Service ------------------
    public interface UserService {
        
    	void register(User user);
    }
    -----------------Service实现类--------------
    public class UserServiceImpl implements UserService {
        
    	/*private UserDao dao = new UserDaoImpl(); 传统做法
    	 * 现在交给Spring管理,使用Spring的setter方法注入
    	 *因为要交给Spring的setter方法注入,所以(必须)提供set方法
    	*/
    	private UserDao dao;
    	
    	@Override
    	public void register(User user) {
        
    		dao.insert(user);
    	}
    	//因为要用
    	public void setDao(UserDao dao) {
        
    		this.dao = dao;
    	}
    }

##### Web表现层实现代码 #####

public class UserServlet {
        
    	/* 传统做法
    	 * private UserService service = new UserServiceImpl();
    	 *	现在交给Spring管理,使用Spring的setter方法注入
    	 *  因为要交给Spring的setter方法注入,所以(必须)提供set方法
    	 */
    	private UserService service;
    	
    	public void register(User user) {
        
    		
    		service.register(user);
    	}
    	public void setService(UserService service) {
        
    		this.service = service;
    	}
    }

##### 创建 db.properites #####

jdbc.driverClassName=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/jdbcdemo
    jdbc.username=root
    jdbc.password=root
    jdbc.maxActive=10

##### applicationContext.xml文件配置代码 #####

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:p="http://www.springframework.org/schema/p"
    	xmlns:context="http://www.springframework.org/schema/context"
        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.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        ">
    	
    	
    	<context:property-placeholder location="classpath:db.properties"/>
    	
    	
    	<bean id="myDataSource" class="com.alibaba.druid.pool.DruidDataSource"
    		init-method="init" destroy-method="close">
    		<property name="driverClassName" value="${jdbc.driverClassName}"/>
    		<property name="url" value="${jdbc.url}"/>
    		<property name="username" value="${jdbc.username}"/>
    		<property name="password" value="${jdbc.password}"/>
    		
    		<property name="maxActive" value="${jdbc.maxActive}"/>
    	</bean>
    	
    	
    	
    	
    	<bean  id="myUserDao" class="com.ywq.spring.dao.impl.UserDaoImpl">
    		
    		<property name="dataSource" ref="myDataSource"/>
    	</bean>
    	
    	
    	<bean  id="myUserService" class="com.ywq.spring.service.impl.UserServiceImpl">
    		
    		<property name="userDao" ref="myUserDao"/>
    	</bean>
    	
    	
    	<bean id="userController" class="com.ywq.spring.controller.UserController">
    		
    		<property name="userService" ref="myUserService"/>
    	</bean>
    	
    
    </beans>

##### 测试代码 #####

@Test
    	public void testRegister() throws Exception {
        
    		//创建用户对象:模拟接受用户参数,封装对象的过程
    		User user = new User();
    		user.setUsername("张三");
    		user.setPassword("admin");
    		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
    		//获取表现层的Servlet即可
    		UserServlet userServlet = context .getBean("userServlet", UserServlet.class);
    		//执行注册操作
    		userServlet.register(user);
    	}