zoukankan html css js c++ java

1210整理

package com.hanqi.dao;

import java.sql.*;
import com.hanqi.common.*;
import java.util.*;


//关于User表的数据库操作类
public class UserDal {

    //增
    public int insert(User user) throws Exception
    {
        int rtn=-1;
        
        Connection conn = DBHelper.getConnection();
        
        PreparedStatement pst = null;
        
        if(conn != null)
        {
            try
            {
                String sql = "insert into T_User (user_id,user_name,password) values (?,?,?)";
                
                pst = conn.prepareStatement(sql);
                
                pst.setString(1, user.getUserID());
                pst.setString(2, user.getUserName());
                pst.setString(3, user.getPassword());
                
                rtn=pst.executeUpdate();
            }
            catch(Exception ex)
            {
                throw ex;
            }
            
            finally
            {
                try
                {
                    pst.close();
                }
                catch(Exception ex)
                {
                    
                }
                
                conn.close();
            }

        }
        
        return rtn;
    }
    //删
    public int delete(String user_id) throws Exception
    {
        int rtn=-1;
        
        Connection conn = DBHelper.getConnection();
        
        PreparedStatement pst = null;
        
        if(conn != null)
        {
            try
            {
                String sql = "delete T_User where user_id = ?";
                
                pst = conn.prepareStatement(sql);
                
                pst.setString(1, user_id);
                
                rtn=pst.executeUpdate();
            }
            catch(Exception ex)
            {
                throw ex;
            }
            finally
            {
                try
                {
                    pst.close();
                }
                catch(Exception ex)
                {
                    
                }
                conn.close();
            }

        }
        
        return rtn;
        
    }
    //改
    public int update(User user) throws Exception
    {
        int rtn=-1;
        
        Connection conn = DBHelper.getConnection();
        
        PreparedStatement pst = null;
        
        if(conn != null)
        {
            try
            {
                String sql = "update T_User set user_name=?,password=? where user_id=?";
                
                pst = conn.prepareStatement(sql);
                
                pst.setString(1, user.getUserName());
                pst.setString(2, user.getPassword());
                pst.setString(3, user.getUserID());
                
                rtn=pst.executeUpdate();
            }
            catch(Exception ex)
            {
                throw ex;
            }
            
            finally
            {
                try
                {
                    pst.close();
                }
                catch(Exception ex)
                {
                    
                }
                
                conn.close();
            }
            
        }
        
        return rtn;
    }
    //查
    public ArrayList<User> getListAll() throws Exception
    {
        ArrayList<User> rtn = new ArrayList<User>();
        
        Connection conn = DBHelper.getConnection();
        
        PreparedStatement pst = null;
        
        if(conn != null)
        {
            try
            {
                String sql = "select * from t_user";
                
                pst = conn.prepareStatement(sql);
                
                ResultSet rs = pst.executeQuery();
                
                if (rs != null)
                {
                    while(rs.next())
                    {
                        User u = new User();
                        
                        u.setUserID(rs.getString("user_id"));
                        u.setUserName(rs.getString("user_name"));
                        u.setPassword(rs.getString("password"));
                        
                        rtn.add(u);
                    }
                }
            }
            catch(Exception ex)
            {
                throw ex;
            }
            
            finally
            {
                try
                {
                    pst.close();
                }
                catch(Exception ex)
                {
                    
                }
                
                conn.close();
            }
            
        }
        return rtn;
    }
    
}

UserDal

package com.hanqi;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.*;
import com.hanqi.dao.*;
/**
 * Servlet implementation class saveUser
 */
@WebServlet("/SaveUser")
public class SaveUser extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public SaveUser() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        
        request.setCharacterEncoding("UTF-8");
            
        response.setContentType("text/html; charset=UTF-8");
        
        response.setCharacterEncoding("UTF-8");
        
        String userid =  request.getParameter("userid");

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

        String pw =  request.getParameter("password");
        
        if(userid == null ||userid.trim().length() == 0)
        {
            response.getWriter().append("用户代码不能为空");
        }
        else if(username == null ||username.trim().length() == 0)
        {
            response.getWriter().append("用户名称不能为空");    
        }
        else
        {
            username = new String(username.getBytes("ISO-8859-1"),"UTF-8");
            
            User user =new User();
            
            user.setUserID(userid);
            user.setUserName(username);
            user.setPassword(pw);
                    
            //调用模型层
            
            UserDal ud = new UserDal();
            
            try
            {
                ud.insert(user);
                
                response.sendRedirect("FindUserList");
            }
            catch(Exception e)
            {
                response.getWriter().append("保存数据失败");
                
                e.printStackTrace();
            }
        }

        
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

增

package com.hanqi;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.hanqi.common.DBHelper;

import java.sql.*;
import java.util.*;
import com.hanqi.dao.*;

/**
 * Servlet implementation class DeleteUser
 */
@WebServlet("/DeleteUser")
public class DeleteUser extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public DeleteUser() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        
        response.setContentType("text/html; charset=UTF-8");
        
        response.setCharacterEncoding("UTF-8");
        
        String userid = request.getParameter("userid");
        
        if (userid != null && userid.trim().length()>0)
        {
            
            UserDal ud = new UserDal();
            
            try
            {
                ud.delete(userid);
                
                response.sendRedirect("FindUserList");
            } 
            catch (Exception e) 
            {
                response.getWriter().append("删除数据失败");
                
                e.printStackTrace();
            }
        }
        else
        {
            response.getWriter().append("userid不能为空");
        }
            
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

删

package com.hanqi;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.hanqi.common.DBHelper;
import com.hanqi.dao.*;

/**
 * Servlet implementation class EditUser
 */
@WebServlet("/EditUser")
public class EditUser extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public EditUser() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        
        request.setCharacterEncoding("UTF-8");
        
        response.setContentType("text/html; charset=UTF-8");
        
        response.setCharacterEncoding("UTF-8");
        
        String userid =  request.getParameter("userid");

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

        String pw =  request.getParameter("password");
        
        if(userid == null ||userid.trim().length() == 0)
        {
            response.getWriter().append("用户ID不能为空");
        }
        else if(username == null ||username.trim().length() == 0)
        {
            response.getWriter().append("用户名称不能为空");    
        }
        else
        {
            User user = new User();
            
            user.setUserID(userid);
            user.setUserName(username);
            user.setPassword(pw);
            
            UserDal ud = new UserDal();
            
            try 
            {
                ud.update(user);
                
                response.sendRedirect("FindUserList");
            } 
            catch (Exception e) 
            {
                response.getWriter().append("修改数据失败");
                
                e.printStackTrace();
            }
        }
        
        
        
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

改

package com.hanqi;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.hanqi.common.DBHelper;
import com.hanqi.dao.*;

/**
 * Servlet implementation class EditUser
 */
@WebServlet("/EditUser")
public class EditUser extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public EditUser() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        
        request.setCharacterEncoding("UTF-8");
        
        response.setContentType("text/html; charset=UTF-8");
        
        response.setCharacterEncoding("UTF-8");
        
        String userid =  request.getParameter("userid");

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

        String pw =  request.getParameter("password");
        
        if(userid == null ||userid.trim().length() == 0)
        {
            response.getWriter().append("用户ID不能为空");
        }
        else if(username == null ||username.trim().length() == 0)
        {
            response.getWriter().append("用户名称不能为空");    
        }
        else
        {
            User user = new User();
            
            user.setUserID(userid);
            user.setUserName(username);
            user.setPassword(pw);
            
            UserDal ud = new UserDal();
            
            try 
            {
                ud.update(user);
                
                response.sendRedirect("FindUserList");
            } 
            catch (Exception e) 
            {
                response.getWriter().append("修改数据失败");
                
                e.printStackTrace();
            }
        }
        
        
        
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

改

package com.hanqi;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.hanqi.dao.User;

import java.sql.*;
import java.util.*;
import com.hanqi.dao.*;

/**
 * Servlet implementation class FindUserList
 */
@WebServlet("/FindUserList")
public class FindUserList extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public FindUserList() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        
        response.setContentType("text/html; charset=UTF-8");
        
        response.setCharacterEncoding("UTF-8");
        UserDal ud = new UserDal(); 
        try
        {
            ArrayList<User> al = ud.getListAll();
            
            request.setAttribute("userlist",al);
        }
        catch(Exception e)
        {
            response.getWriter().append("查找数据失败");
            
            e.printStackTrace();
        }
        
        
        request.getRequestDispatcher("ShowUserLiset.jsp").forward(request,response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

查

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原文地址：https://www.cnblogs.com/zxw0004/p/5037511.html