loginservlet.java

一个web应用中找回密码的代码,这个代码实现了我们在web开发当中遇到的的密码丢失问题后如何解决这个问题的实现。

package searchpassword;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.sql.*;
public class loginServlet extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=GBK";

    //Initialize global variables
    public void init() throws ServletException {
    }

    //Process the HTTP Get request
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        response.setContentType(CONTENT_TYPE);
        PrintWriter out = response.getWriter();
        String username=request.getParameter("username");
        String password=request.getParameter("password");
        try{
            Connection con=GetCon.get();
            PreparedStatement ps=con.prepareStatement("select username,password from UserTb1 where username=?");
            ps.setString(1,username);
            ResultSet rs=ps.executeQuery();
            if(rs.next())
            {
                RequestDispatcher rds=request.getRequestDispatcher("success.jsp");
                rds.forward(request,response);
            }
            else
            {
                RequestDispatcher res=request.getRequestDispatcher("f.jsp");
                res.forward(request,response);
            }
        }catch(Exception e)
        {
            e.printStackTrace();
        }
        out.close();
    }

    //Process the HTTP Post request
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        doGet(request, response);
    }

    //Clean up resources
    public void destroy() {
    }
}