loginaction.java

基于struts mvc架构的jsp登录处理模块。

/*
 * LoginAction.java
 *
 * Created on 2008年3月4日, 上午9:16
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

/**
 *
 * @author Administrator
 */
import org.apache.struts.action.*;
import javax.servlet.http.*;
import java.io.IOException;
import javax.servlet.ServletException;
import java.util.ArrayList;
import java.sql.*;
public class LoginAction extends Action
{
    public ActionForward  execute(ActionMapping mapping,ActionForm form,
            HttpServletRequest req,HttpServletResponse res)throws IOException,ServletException,SQLException
    {LoginForm loginForm=(LoginForm)form;
     DBconnect dbc=new DBconnect();
     Connection conn=dbc.getConn();
     ResultSet rs;
     Statement stmt;
     String username=loginForm.getUsername();
     String password=loginForm.getPassword();
     String sql=null;
     try
     { sql="select*from user where username='"+username+"'";
       stmt=conn.createStatement();
       rs=stmt.executeQuery(sql);
       if(rs.equals(""))
       {return mapping.findForward("failure");
       }
          else if(rs.next())
          {if(password.equals(rs.getString("password")))
               {return mapping.findForward("success");
                }
           else
               {return mapping.findForward("failure");
               }
          }
        stmt.close();
        conn.close();
      }
    catch(Exception e)
      {e.printStackTrace();
       return mapping.findForward("failure");	
      }
    return mapping.findForward("failure");
    }
}