loginvalid.java

重点不是信息管理系统

package com.yijia_ctgu.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Enumeration;

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 org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import com.yijia_ctgu.DB.*;
import com.yijia_ctgu.exception.NotQueryException;
import org.apache.commons.beanutils.BasicDynaBean;
public class LoginValid extends HttpServlet {

	public void doGet(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		res.setCharacterEncoding("utf-8");
		res.setContentType("text/html");
		HttpSession session=req.getSession();
		PrintWriter out = res.getWriter();
	    String username=req.getParameter("username");
	    String password=req.getParameter("password");
	    String usertype=req.getParameter("usertype");
	    JSONObject obj=new JSONObject();
	    try {
	    	BasicDynaBean userData=DB.getTable("user").getRowData(username);
			if(userData.get("password").equals(password)){
				if(userData.get("usertype").equals(usertype)){
					obj.put("success", true);
				    session.setAttribute("userData", userData);	
				}else{
					obj.put("success", false);
					obj.put("errors", "请选择正确的用户类型");
				}    
			}
			else {
				obj.put("success", false);
				obj.put("errors", "密码错误");
			}
		} 
	    catch(NotQueryException ex){
	    	obj.put("success", false);
	    	obj.put("errors", "用户名不存在");
 		}catch (SQLException e) {
 			obj.put("success", false);
 			obj.put("errors", "数据库故障");
		}
		out.println(obj);
	}
	public void doPost(HttpServletRequest req, HttpServletResponse res)
	throws ServletException, IOException {
		doGet(req,res);
	}
	
}