📄 chkloginservlet.java

📁 用JSP实现毕业设计选题系统,老师在网上出题,学生通过WEB来选题等功能
💻 JAVA
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/**
 * 
 */
package servlet;
import java.io.IOException;
import java.io.PrintWriter;

import student.StudentBean;
import student.StudentManage;
import teacher.TeacherBean;
import teacher.TeacherManage;
import util.Utils;
import java.security.NoSuchAlgorithmException;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;

/**
 * @author 朱定芬
 *
 */
public class ChkLoginServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet 
{
	StudentManage sm=null;
	TeacherManage tm=null;
	StudentBean sb=null;
	TeacherBean tb=null;
	Utils ut=null;
	ResultSet rs=null;
    int i=0;
    String type=null,loginid=null,loginpsd=null;
    //构造函数
    public ChkLoginServlet()
    {
    	super();
        	try 
        	{
            	sm=new StudentManage();
            	tm=new TeacherManage();
            	sb=new StudentBean();
            	tb=new TeacherBean();
				ut=new Utils();
			} 
        	catch (NoSuchAlgorithmException e) 
			{
				e.printStackTrace();
			}
    }
	//doGet方法,调用doPost方法
	protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException 
	   {
		doPost(request,response);
	   }
	//doPost方法,此方法主要用于处理用户的登录
	protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException 
	   {
	   	response.setContentType("text/html;charset=GB2312");
	   	PrintWriter out=response.getWriter();
	   	out.println("<HTML><BODY>");
	   	//获取登录的类型
	   	type=(String)ut.StrToISO(request.getParameter("type"));
	   	//获取用户名和用户密码
   		loginid=(String)ut.StrToISO(request.getParameter("LoginId"));
   		loginpsd=(String)ut.StrToISO(ut.md5crypt(request.getParameter("LoginPsd")));
	   	//如果是学生登录
	   	if(type.equalsIgnoreCase("student"))
	   	{
	   		//检测是否正常登录
	   		if(sm.ChkStudent(loginid, loginpsd))
	   		{
	   			request.getSession().setAttribute("student_id", loginid);
	   			out.print("<script language='javascript'> alert('登录成功');javascript:location='/Course/Student/index.jsp';</script>");
	   		}
	   		else
	   		{
	   			out.print("<script language='javascript'> alert('你输入的登录ID号或登录密码错误');javascript:history.go(-1);</script>");
	   		} 		
	   	}
	   	//如果是老师登录
	   	else if(type.equalsIgnoreCase("teacher"))
	   	{
	   		if(tm.ChkTeacher(loginid, loginpsd))
	   		{
	   			request.getSession().setAttribute("teacher_id", loginid);
	   			out.print("<script language='javascript'> alert('登录成功');javascript:location='/Course/Teacher/index.jsp';</script>");
	   		}
	   		else
	   		{
	   			out.print("<script language='javascript'> alert('你输入的登录ID号或登录密码错误');javascript:history.go(-1);</script>");
	   		}	   		
	   	}
	   	//如果是系统管理员
	   	else if(type.equalsIgnoreCase("system"))
	   	{
	   		if(loginid.equals("admin")&&loginpsd.equals("21232F297A57A5A743894A0E4A801FC3"))
	   		{
		   		request.getSession().setAttribute("system_id", loginid);
		   		out.print("<script language='javascript'> alert('登录成功');javascript:location='/Course/System/index.jsp';</script>");
		   	}
		   	else
		   	{
		   		out.print("<script language='javascript'> alert('你输入的登录ID号或登录密码错误');javascript:history.go(-1);</script>");
		   	}
	   	}
	   	else
	   	{
	   		out.print("<script language='javascript'> alert('你进行了错误的操作');javascript:history.go(-1);</script>");
	   	}
	    out.print("</BODY></HTML>");
	   }
}
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