login_let.java

一个基于JSP的在线动物识别系统

package main;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import function.*;
public class login_let extends HttpServlet{
	public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{
		HttpSession session=request.getSession();
		String mark=(String)(session.getAttribute("mark"));
		CommonHTML commonHTML=new CommonHTML();
		response.setContentType("text/html;charset=UTF-8");
		PrintWriter outPrintWriter=response.getWriter();
		if(mark==null||!mark.equals("artificial")){
			outPrintWriter.println(commonHTML.GetErrorPageHTML("Invalid session!"));
			return;
		}
		//根据是否登陆来判断怎样进入manage_let页面
		String loginFlag=(String)(session.getAttribute("login"));
		if(loginFlag!=null&&loginFlag.equals("true")){
			response.sendRedirect("manage_let");
			return;
		}
		else{
			response.sendRedirect("login.jsp");
			return;
		}
	}
/*	private String getLogin(){
		StringBuffer buffer=new StringBuffer();
		buffer.append("<a href=\"index.jsp\">Back To Main</a><br><br>Login First!<br>\n");
		buffer.append("<%String temp=\"fuck\";%>\n");
		buffer.append("Username: <input type=\"text\" name=\"username\"><%= \"fuck\"%><br>\n");
		buffer.append("Password: <input type=\"text\" name=\"password\"><br>\n");
		buffer.append("   <input type=\"submit\" name=\"submit\" value=\"submit\">\n");
		CommonHTML common=new CommonHTML();
		return common.GetFormHTML("Login", "manage_let", "get", buffer.toString());
	}*/
	public void doPost(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{
		doGet(request, response);
	}
}