loginservlet.java

一个较简单的论坛——中国精英论坛,是我的一个练习

package com.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
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 com.bean.*;
import com.serviceImp.*;
import java.util.*;

/*验证：
1、无效字符的验证
2、用户名密码的错误
3、验证码错误的验证
4、用户名登录成功的导航*/

public class LoginServlet extends HttpServlet {
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost(request,response);
	}

	
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=gb2312");
		PrintWriter out=response.getWriter();
		String userName=request.getParameter("userName");
		String userPwd =request.getParameter("userPwd");
		String checkCode=request.getParameter("checkCode");
		HttpSession session=request.getSession();
		String check_code=(String)session.getAttribute("check_code");
		Boolean flag =true;
		/*out.println(userName);
		out.println(userPwd);
		out.println(checkCode);
		out.println(check_code);*/
		
		RequestDispatcher rd1=request.getRequestDispatcher("head.jsp");
		rd1.include(request,response);
		out.println("<div class='normLayout'>");
		if(userName.trim().length()==0 ||
				userPwd.trim().length()==0||checkCode.trim().length()==0){
			out.println("<img src='/jsp_jd08100/myPro/img/8.gif'>不能为空！");
			out.println("<a href='login.jsp'>［重新登录］</a>");
			out.println("<a href='index.jsp'>［返回首页］</a>");
			
			flag=false;
		}
		if(!checkCode.trim().equals(check_code)&&flag){
			out.println("<img src='/jsp_jd08100/myPro/img/8.gif'>验证码错误！");
			out.println("<a href='login.jsp'>［重新登录］</a>");
			out.println("<a href='index.jsp'>［返回首页］</a>");
			
			flag=false;
		}
		//判断用户名密码是否正确
		UserService service=UserService.getUserService();
		List<User> list=service.load(userName.trim().toLowerCase(), userPwd.trim().toLowerCase());
		//用户名或密码不正确
		if(list.size()==0&&flag){
			out.println("<img src='/jsp_jd08100/myPro/img/8.gif'>用户名或密码不对！");
			out.println("<a href='login.jsp'>［重新登录］</a>");
			out.println("<a href='index.jsp'>［返回首页］</a>");
			
		}else if(list.size()!=0 && flag){//正常登录
			User user=list.get(0);
			session.setAttribute("user",user);
			//out.println("<img src='/jsp_jd08100/myPro/img/8.gif'>登录成功！");
			RequestDispatcher rd=request.getRequestDispatcher("normUserAllInform.jsp");
			rd.forward(request,response);
		}
		out.println("</div>");
		RequestDispatcher rd2=request.getRequestDispatcher("foot.jsp");
		rd2.include(request,response);
		out.flush();
		out.close();
	}

}