package com.muke;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;@SuppressWarnings("serial")public class LoginServlet extends HttpServlet{ public void doGet(HttpServletRequest request,HttpServletResponse response)throws IOException{ String piccode =(String)request.getSession().getAttribute("piccode"); String checkcode = request.getParameter("checkcode"); checkcode = checkcode.toUpperCase(); response.setContentType("text/html;chsrset=gbk"); PrintWriter out = response.getWriter(); if(checkcode.equals(piccode)){ out.println("輸入正確"); } else{ out.println("輸入有誤"); } out.flush(); out.close(); }}
空指針如何處理?java.lang.NullPointerException
慕的地8602654
2016-06-09 19:31:30