＜body＞代數和為負整數，其和值為：${add.x}+${add.y}=${add.sum}＜/body＞

    package com.model.user;
    public class EndUser{
      private Integer userId;
      private String userName;
      private String userPassword;
      private String userRealName;
      //這里省略了所有屬性的setter/getter方法
    }

    package com.db_util;
    import java.sql.*;
    public class DBConnection {
      private static String driverName="com.mysql.jdbc.Driver"; //MySQL數據庫驅動程序
      private static String userName="root";  //數據庫用戶名
      private static String userPwd="123456"; //數據庫用戶密碼
      private static String dbName="struts2";  數據庫名稱
      public static Connection getDBConnection(){ //獲取數據庫連接對象的方法
        String url1="jdbc:mysql://localhost/"+dbName;
        String url2="? user="+userName+"&password="+userPwd;
        String url3="&useUnicode=true&characterEncoding=utf-8";
        String url=url1+url2+url3;    //形成數據庫連接字
        Connection con=null;
        try {
          Class.forName(driverName);   //加載驅動
          con=DriverManager.getConnection(url); //獲取數據庫連接對象
        } catch (Exception e) {e.printStackTrace(); }
        return con;
      }
      //關閉數據庫連接的各資源對象
      public static void closeDB(Connection con, PreparedStatement pstm, ResultSet rs){
        if(rs! =null) try {rs.close(); } catch (SQLException e) {e.printStackTrace(); }
        if(pstm! =null) try {pstm.close(); } catch (SQLException e) {e.printStackTrace(); }
        if(con! =null) try {con.close(); } catch (SQLException e) {e.printStackTrace(); }
      }
    }

    package com.dao.user;
    //省略了import導入包；
    public class UserDao {
      public int save(EndUser user) { //向數據庫中插入一個用戶的方法
        Connection con=null;
        PreparedStatement pstmt=null;
        ResultSet rs=null;
        con=DBConnection.getDBConnection();
        int row=0;
        String sql="insert into user(userName, userPassword, userRealName) values(? , ? , ? )";
        try {
          pstmt=con.prepareStatement(sql);
          pstmt.setString(1, user.getUserName());
          pstmt.setString(2, user.getUserPassword());
          pstmt.setString(3, user.getUserRealName());
          row=pstmt.executeUpdate();
        } catch (Exception e) {e.printStackTrace(); }
        finally{DBConnection.closeDB(con, pstmt, rs); }
        return row;
      }
      public EndUser find(EndUser user) { //從數據庫中查找一個用戶，用于驗證是否注冊
        Connection con=null;
        PreparedStatement pstmt=null;
        ResultSet rs=null;
        con=DBConnection.getDBConnection();
        EndUser user2=null;
        String sql="select * from user where userName=? and userPassword=? ";
        try {
          pstmt=con.prepareStatement(sql);
          pstmt.setString(1, user.getUserName());
          pstmt.setString(2, user.getUserPassword());
          rs=pstmt.executeQuery();
          if(rs.next()){
            user2=new EndUser();
            user2.setUserId(rs.getInt("id"));
            user2.setUserName(rs.getString("userName"));
            user2.setUserPassword(rs.getString("userPassword"));
            user2.setUserRealName(rs.getString("userRealName"));
              }
          } catch (Exception e) {e.printStackTrace(); }
        finally{DBConnection.closeDB(con, pstmt, rs); }
        return user2;
      }
    }

    package com.action.user;
    //省略了import導入包；
    public class UserAction {
      private EndUser user;
      private UserDao userDao = new UserDao();
      public String userLogin() throws Exception {//用戶登錄Action方法
        String forward = null;
        EndUser user2 = userDao.find(user);
        if(user2! =null){forward="success"; }else{ forward="failure"; }
        return forward;
      }
      public String userRegister() throws Exception {//用戶注冊Action方法
        String forward="error";   //數據庫存數據時出錯標記值
        int flag = 0;
        EndUser user2=(userDao.find(user));
        if (user2! =null){forward = "error_user"; //用戶名已被占用標記標記值
        } else {
          flag = userDao.save(user);
          if (flag = = 1) {forward = "success"; //成功注冊標記值}
        }
        return forward;
      }
      //這里省略了屬性user的set/get方法，對于屬性UserDao userDao，不需要set/get方法
    }

    ＜struts＞
        ＜include file="struts-user.xml" /＞
    ＜/struts＞

    ＜body＞
      ＜form method="post" action="/struts2user/user/logincheck"＞
      ＜table＞
        ＜tr＞＜th colspan="2"＞用戶登錄＜/th＞＜/tr＞
        ＜tr＞＜td align="right"＞用戶名：＜/td＞ ＜td＞＜input name="user.userName" /＞＜/td＞ ＜/tr＞
        ＜tr＞＜td align="right"＞密碼：＜/td＞
          ＜td＞＜input type="password" name="user.userPassword" /＞＜/td＞ ＜/tr＞
        ＜tr＞＜td align="left"＞＜input type="submit" value="登錄" /＞＜/td＞
          ＜td＞未注冊者，請先注冊，單擊＜a href="/struts2user/user/register.jsp"＞注冊＜/a＞＜/td＞
        ＜/tr＞
      ＜/table＞
      ＜/form＞
    ＜/body＞

    ＜body＞
      歡迎你，${user.userRealName}，你登入成功！! ＜br＞
      進入主頁面，請點擊＜a href="/struts2user/index.jsp"＞主頁面＜/a＞
    ＜/body＞

    ＜body＞
      ＜h2 align="center"＞
        ＜font color="red"＞對不起，你填寫的賬號和密碼不正確！請＜/font＞
          ＜a href="/struts2user/user/login.jsp"＞重新登錄＜/a＞
      ＜/h2＞
    ＜/body＞

    ＜head＞＜title＞注冊頁面＜/title＞
    ＜script type="text/javascript"＞
      function isValidate(form) {
        var username=document.getElementById("username").value;
        var userpass=document.getElementById("userpassword").value;
        var userpass1=document.getElementById("userpass1").value;
        if (userpass ! = userpass1) {
          alert("兩次密碼輸入不一致，請重新輸入！");
          return false;
        }else if (userpass.length＜=0 ||username.length＜=0 ) {
          alert("用戶名以及密碼不能為空，請重新輸入！");
          return false; }
        else{return true; }
      }
    ＜/script＞＜/head＞
    ＜body＞
      ＜h3 align="left"＞歡迎注冊我們的系統，請認真填寫您的信息＜/h3＞
      ＜form name="register" action="/struts2user/user/register"
                  method="post"  onsubmit="return isValidate()"＞
        ＜table＞
          ＜tr＞＜td align="right"＞賬戶名：＜/td＞
            ＜td＞＜input name="user.userName" id="username"＞＜/td＞＜/tr＞
          ＜tr＞＜td align="right"＞為您的賬戶設置密碼：＜/td＞
            ＜td＞＜input type="password"
                      name="user.userPassword" id="userpassword"＞＜/td＞＜/tr＞
          ＜tr＞＜td align="right"＞再次確認您的密碼：＜/td＞
            ＜td＞＜input type="password" name="userpass1" id="userpass1"＞＜/td＞＜/tr＞
          ＜tr＞＜td align="right"＞真實姓名：＜/td＞
            ＜td＞＜input  name="user.userRealName"id="userrealname"＞＜/td＞＜/tr＞
          ＜tr＞＜td align="right"＞＜input type="submit" value="提交"＞＜/td＞
            ＜td colspan="2"＞＜input type="reset" value="重新填寫"＞＜/td＞＜/tr＞
        ＜/table＞
      ＜/form＞
    ＜/body＞