stuentryservlet.java

用java+servlet实现在线考试系统

package com.zte.exam.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import java.util.List;

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

import com.zte.database.Database;

public class StuEntryServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public StuEntryServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @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 doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		   request.setCharacterEncoding("gbk");
		   String userid=request.getParameter("textfield");
	       String username=request.getParameter("textfield2");
	       System.out.println(userid+"*******"+username);
	       String sql="select stu_id,stuname from exam_student";
	       String SQL="select * from exam_examtype"; 
	       Database db = new Database();
	       List list=db.TypeQuerylist(SQL);
	       System.out.println(list);
	       ResultSet rs= db.query(sql);
	       try {
			while(rs.next())
			   {
				  String stu_id=rs.getString("STU_ID"); 
				  String stuname=rs.getString("STUNAME");
				  System.out.println(stu_id+"-----"+stuname);
				  if(userid.equals(stu_id)&&username.equals(stuname))
				  {    
				       response.sendRedirect("student/onLine.jsp");
				       request.getSession().setAttribute("list",list);
				       request.getSession().setAttribute("name",username);
				       return;	 
				  }else
				  {
					  continue;
				  } 
			   }
			if(!rs.next())
			{
				response.sendRedirect("student/entry.jsp?flag=success");
				System.out.println("nihao");
			} 
			
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	       
		
	}

	/**
	 * 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 {

		doGet(request,response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}