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Java 自定义MVC示例

2013-10-31 11:14 246 查看

// MVC：强制性的使应用的输入、处理和输出分开

// M：模型，包括JavaBean，业务逻辑处理和数据访问应该放在Model层

// V：视图，用户看到并与之交互的界面，负责展示数据，由html、jsp等来做
// C：控制，负责转发，将用户请求转发给模型层，经过处理后把结果返回到界面层，由servlet来做

一、视图层

1. 登陆界面login.jsp

<body bgcolor="pink">

   <center>

             用户登陆 <br> <hr>

     <form action="LoginClServlet"> 

             账号：<input type="text" name = "username"><br>

             密码：<input type="text" name = "passwd"><br>

     <input type="submit" value="登陆">

     <input type = "reset" value="重置">

     </form>

     </center>

</body>

2. 欢迎界面wel.jsp

<body>

      登陆成功！<%=request.getParameter("username")%><br>

      <a href="login.jsp">退出</a><hr>

</body>

二、控制层

1. 登陆转发Servlet：LoginClServlet.java

package com.jiang.controller;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.jiang.model.UserBeanCl;

public class LoginClServlet extends HttpServlet {

   private static final long serialVersionUID = -2923205347859728847L;

   public void doGet(HttpServletRequest request, HttpServletResponse response)

           throws ServletException, IOException {

       //得到用户名和密码

       String u = request.getParameter("username");

       String p = request.getParameter("passwd");

       //使用模型（userBeanCl），完成对用户的验证

       UserBeanCl ubc = new UserBeanCl();

       if(ubc.checkUser(u, p)){

           request.getRequestDispatcher("wel.jsp").forward(request, response);

       }else{

           request.getRequestDispatcher("login.jsp").forward(request, response);

       }

   }

   public void doPost(HttpServletRequest request, HttpServletResponse response)

           throws ServletException, IOException {

       this.doGet(request, response);

   }

}
2. LoginClServlet.java配置

<servlet>

    <description>This is the description of my J2EE component</description>

    <display-name>This is the display name of my J2EE component</display-name>

    <servlet-name>LoginClServlet</servlet-name>

    <servlet-class>com.jiang.controller.LoginClServlet</servlet-class>

</servlet>

<servlet-mapping>

    <servlet-name>LoginClServlet</servlet-name>

    <url-pattern>/LoginClServlet</url-pattern>

</servlet-mapping>

三、模型层

1. 用户Bean： UserBean.java

package com.jiang.model;

public class UserBean {

   private String username;

   private String password;

   public String getUsername() {

       return username;

   }

   public void setUsername(String username) {

       this.username = username;

   }

   public String getPassword() {

       return password;

   }

   public void setPassword(String password) {

       this.password = password;

   }



}

2. 用户登陆业务处理 UserBeanCl.java

package com.jiang.model;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

public class UserBeanCl {

   private Connection ct = null;

   private PreparedStatement ps = null;

   private ResultSet rs = null;

   // 验证用户

   public boolean checkUser(String u, String p) {

       boolean b = false;

       try {

           ConnDB cd = new ConnDB();

           ct = cd.getConn();

           ps = ct.prepareStatement("select password from t_user where username ='"

                           + u + "'");

           rs = ps.executeQuery();

           if (rs.next()) {

               String dbPasswd = rs.getString("password");

               if (dbPasswd.equals(p)) {

                   b = true;

               }

           }

       } catch (Exception ex) {

           ex.printStackTrace();

       } finally {

           this.close();

       }

       return b;

   }

   // 关闭资源

   public void close() {

       try {

           if (rs != null) {

               rs.close();

               rs = null;

           }

       }catch(Exception e){

           e.printStackTrace();

       }

       try{

           if (ps != null) {

               ps.close();

               rs = null;

           }

       }catch(Exception e){

           e.printStackTrace();

       }

       try{

           if (ct != null) {

               ct.close();

               ct = null;

           }

       } catch (Exception ex) {

           ex.printStackTrace();

       }

   }

}
3. 数据库连接逻辑处理 ConnDB.java

package com.jiang.model;

import java.sql.Connection;

import java.sql.DriverManager;

public class ConnDB {

   private Connection ct = null;

   public Connection getConn() {

       try {

           Class.forName("com.mysql.jdbc.Driver");

           ct = DriverManager.getConnection(

                    "jdbc:mysql://localhost:3306/aaa", "root", null);



       } catch (Exception ex) {

           // TODO Auto-generated catch block

           ex.printStackTrace();

       }

       return ct;

   }

}

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