一个简单的Java MVC模式示例详解编程语言

package com.neuq.control;           //视图层 
 
import java.io.IOException; 
import java.sql.SQLException; 
import java.util.List; 
 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
 
import com.neuq.dao.UserDao; 
import com.neuq.service.UserService; 
import com.neuq.vo.UserVO; 
 
public class UserManage extends HttpServlet { 
	 
	public void doGet(HttpServletRequest request, HttpServletResponse response) 
			throws ServletException, IOException { 
		this.doPost(request, response); 
	} 
 
	 
	//增加用户 
	public void addUser(HttpServletRequest request, HttpServletResponse response) 
			throws ServletException, IOException, SQLException { 
		//获取客户端传进来的数据 
		String userName =(String)request.getParameter("userName"); 
		String password = (String)request.getParameter("password"); 
		String sex = (String)request.getParameter("sex"); 
		String hobby = (String)request.getParameter("hobby"); 
		String email = (String)request.getParameter("email"); 
		String telephone = (String)request.getParameter("telephone"); 
		String province = (String)request.getParameter("province"); 
		 
		UserVO user = new UserVO();        //建立一个实例，利用控制层 
		user.setUserName(userName); 
		user.setPassword(password); 
		user.setSex(sex); 
		user.setHobby(hobby); 
		user.setEmail(email); 
		user.setTelephone(telephone); 
		user.setProvince(province); 
		 
		 
		UserService userService = new UserService(); 
		int resultCount=userService.addUser(user); 
		if(resultCount<=0){ 
			request.setAttribute("info","添加失败！" ); 
		}else{ 
			request.setAttribute("info", "添加成功！"); 
		} 
		 
		request.getRequestDispatcher("../info.jsp").forward(request, response);//请求转发 
	} 
	 
	//删除用户 
	public void deleteUser(HttpServletRequest request, 
			HttpServletResponse response) throws IOException { 
		String userName = request.getParameter("userName"); 
		UserService userService = new UserService(); 
		boolean flag =userService.deleteUser(userName); 
		if (flag) { 
			request.setAttribute("info", "删除数据成功！"); 
		} else { 
			request.setAttribute("info", "删除数据失败！"); 
		} 
		try { 
			request.getRequestDispatcher("../info.jsp").forward(request, response); 
		} catch (ServletException e) { 
			// TODO Auto-generated catch block 
			e.printStackTrace(); 
		}  
	} 
		 
	 
	 
	 
	//查询用户 
	public void selectUser(HttpServletRequest request, 
			HttpServletResponse response) throws ServletException, IOException { 
		String userName =(String)request.getParameter("userName"); 
		 
		UserDao userDao = new UserDao(); 
		List list = (List)userDao.getUsers(userName); 
        request.setAttribute("result", list); 
		 
		request.getRequestDispatcher("../ShowMessage.jsp").forward(request, response); 
	} 
 
	//修改用户 
	public void updateUser(HttpServletRequest request, HttpServletResponse response) 
	throws ServletException, IOException, SQLException { 
		String userName=(String)request.getParameter("userName"); 
		String password = (String)request.getParameter("password"); 
		String sex = (String)request.getParameter("sex"); 
		String hobby = (String)request.getParameter("hobby"); 
		String email = (String)request.getParameter("email"); 
		String telephone = (String)request.getParameter("telephone"); 
		String province = (String)request.getParameter("province"); 
		 
		UserVO user = new UserVO();        //建立一个实例，利用控制层 
		user.setUserName(userName); 
		user.setPassword(password); 
		user.setSex(sex); 
		user.setHobby(hobby); 
		user.setEmail(email); 
		user.setTelephone(telephone); 
		user.setProvince(province); 
		 
		UserService userService = new UserService(); 
		int resultCount=userService.updateUser(user); 
		if(resultCount<=0){ 
			request.setAttribute("info", "修改数据失败！"); 
		}else{ 
			request.setAttribute("info", "修改数据成功！"); 
		} 
		try { 
			request.getRequestDispatcher("../info.jsp").forward(request, response); 
		} catch (ServletException e) { 
			// TODO Auto-generated catch block 
			e.printStackTrace(); 
		}  
	} 
	 
	 
	 
	public void doPost(HttpServletRequest request, HttpServletResponse response) 
	throws ServletException, IOException { 
		String method=(String)request.getParameter("method"); 
		try { 
			if("add".equals(method)){	 
					addUser(request,response); 
			}else if("select".equals(method)){ 
				selectUser(request,response); 
			}else if("update".equals(method)){ 
				updateUser(request,response); 
			}else if("delete".equals(method)){ 
				deleteUser(request,response); 
			} 
				} catch (SQLException e) { 
					e.printStackTrace(); 
				} 
	} 
 
	 
 
}