<%@ page cOntentType="text/html;charset=UTF-8" language="java" %>


  
  
  



  
    

      

        
用户名
        

      
      

        
密码
        

      
      

        
验证码
        

      
      

        

      
      

        

      
    


  


  
<%=request.getAttribute("cc_error") == null &＃63; "" : request.getAttribute("cc_error")%>
  
<%=request.getAttribute("login_error") == null &＃63; "" : request.getAttribute("login_error") %>

package Test;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

@WebServlet("/checkCodepic")
public class CheckCodepic extends HttpServlet {
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    int width=100;
    int height=50;
    //创建图片对象
    BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);

    //美化图片
    //创建画笔
    Graphics g = image.getGraphics();
    //画笔颜色
    g.setColor(Color.pink);
    //画个矩形，填充为粉红色
    g.fillRect(0,0,width,height);
    //给矩形加边框
    g.setColor(Color.blue);
    g.drawRect(0,0,width-1,height-1);
    //写字母或数字
    g.setColor(Color.green);
    String str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    Random rd=new Random();
    StringBuilder sb=new StringBuilder();
    for(int i=1;i<=4;i++){
      int index = rd.nextInt(str.length());
      char c = str.charAt(index);
      sb.append(c);
      g.drawString(c+"",width/5*i,height/2);
    }
    String checkCode_session = sb.toString();
    //将验证码存入session
    req.getSession().setAttribute("checkCode_session",checkCode_session);
    //加干扰线
    g.setColor(Color.blue);
    for(int i=1;i<=10;i++){
      int x1 = rd.nextInt(width);
      int x2 = rd.nextInt(width);
      int y1 = rd.nextInt(height);
      int y2 = rd.nextInt(height);
      g.drawLine(x1,y1,x2,y2);
    }

    //输出展示
    ImageIO.write(image,"jpg",resp.getOutputStream());
  }

  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    this.doPost(req,resp);
  }
}

package Test;

import Test.dao.UserDao;
import Test.userclass.User;
import org.apache.commons.beanutils.BeanUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;

@WebServlet("/loginServlet")
public class loginServlet extends HttpServlet {
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    //设置request编码
    request.setCharacterEncoding("utf-8");
    //获取参数
//    String username = request.getParameter("username");
//    String password = request.getParameter("password");
//    String checkCode = request.getParameter("checkCode");
//    User user=new User();
//    user.setUsername(username);
//    user.setPassword(password);
//    user.setCheckCode(checkCode);
    Map parameterMap = request.getParameterMap();
    User user=new User();
    try {
      BeanUtils.populate(user,parameterMap);
    } catch (IllegalAccessException e) {
      e.printStackTrace();
    } catch (InvocationTargetException e) {
      e.printStackTrace();
    }
    UserDao userDao=new UserDao();
    //先判断验证码是否正确
    String checkCode_session = (String)request.getSession().getAttribute("checkCode_session");
    request.getSession().removeAttribute("checkCode_session");
    if(checkCode_session!=null && checkCode_session.equalsIgnoreCase(user.getCheckCode())){//忽略大小写
      //如果正确，判断用户名密码是否正确
      User login = userDao.login(user);
      if(login!=null){
        //登陆成功，存储用户信息
        request.getSession().setAttribute("username",login.getUsername());
        //重定向到success.jsp
        response.sendRedirect(request.getContextPath()+"/success.jsp");

      }else{//登陆失败，转发到登陆界面
        request.setAttribute("login_error","用户名或密码不正确");
        request.getRequestDispatcher("/login.jsp").forward(request,response);

      }
    }else{ //如果不正确，转发到登陆界面
      request.setAttribute("cc_error","验证码不正确");
      request.getRequestDispatcher("/login.jsp").forward(request,response);

    }
  }

  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    this.doPost(request, response);
  }
}

<%@ page cOntentType="text/html;charset=UTF-8" language="java" %>


  



  
<%=request.getSession().getAttribute("username")%>,欢迎您