/* * 
* login username user name password password 
*/
Public Boolean login (String username, String password) {
//get the Sql query statement 
String logSql="select * from the userinfo where user='" + username 
+ "' and PSW='" +" + "' "; 
The log. LogMsg (tmpLogFile logSql, "login"); 
//get the DB object 
SQL=DBManager DBManager. CreateInstance (); 
SQL. ConnectDB (); 

//DB operation object 
Try {
The ResultSet rs=SQL. ExecuteQuery (logSql); 
{if (rs. Next ()) 
SQL. CloseDB (); 
return true; 
} 
} the catch (SQLException e) {
The logMsg (tmpLogFile, e. oString (), the TAG); 
} 
SQL. CloseDB (); 
return false; 
} 

 
Public class LogLet extends the HttpServlet {

Private static final long serialVersionUID=369840050351775312 l; 

@ Override 
Public void doGet (it request, HttpServletResponse response) 
Throws ServletException, IOException {
this.doPost(request, response); 
} 

@ Override 
Public void doPost (it request, HttpServletResponse response) 
Throws ServletException, IOException {

//receive client information 
String username=request. The getParameter (" username "); 

String password=request. The getParameter (" password "); 

//new service object 
Service serv=new Service (); 

//verification processing 
Boolean loged=serv. Login (username, password); 

If (loged) {

} else {
//System. Out. Print (" Failed "); 
} 

//return information to the client 
response.setCharacterEncoding("UTF-8"); 
The response. SetContentType (" text/HTML "); 
PrintWriter out=response.getWriter(); 
Out. Print (String. The valueOf (loged)); 
out.flush(); 
out.close(); 

} 

}