📄 servletlogin.java
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package votebean;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import votebean.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* @author xiaoq
*
*/
public class ServletLogin extends HttpServlet {
/**
* Constructor of the object.
*/
public ServletLogin() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
response.setContentType("text/html");
//name
String strUserName=request.getParameter("txtUserName");
//password
String strPassWord=request.getParameter("txtPassWord");
MysqlDAO db=new MysqlDAO();
Connection conn=null;
Statement stat=null;
ResultSet rs=null;
try{
conn=db.getConnection();
String sql="select * from vote_admin where (Username='"
+strUserName+"'and userpwd='"+strPassWord+"')";
stat=conn.createStatement();
rs=stat.executeQuery(sql);
if(rs.next()){
request.getSession(true).setAttribute("userName", strUserName);
out.print(strUserName+"欢迎登录");
response.sendRedirect("/vote/admin/index.jsp");
}else{
request.setAttribute("error", "you must login your right username and your right pwd");
try{
request.getRequestDispatcher("/admin/error.jsp").
forward(request, response);
}catch(Throwable t){
getServletContext().log(t.getMessage());
}
}
}catch(SQLException sql){
sql.printStackTrace();
}catch(Exception e){
e.getStackTrace();
}finally{
try{
if(rs!=null){
rs.close();
}
if(stat!=null){
stat.close();
}
if(conn!=null){
conn.close();
}
}catch(SQLException e){
e.printStackTrace();
}
}
}
/**
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the POST method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
*/
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
//this.doPost(request, response);
// Put your code here
}
}
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