第五次作业

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>登录页面</title>
<style>
    body{font-size:16px;}
</style>
<script type="text/javascript">
    function $(id){
        return document.getElementById(id);
    }
    function changeCode(){
        $("code").src = "ValidateCodeServlet?a="+new Date();
    }
    function mycheck(){
        if(form1.userName.value==""){
            alert("用户名不能为空，请输入用户名！");
            from1.userName.focus();
            return;
        }
        if(form1.password.value==""){
            alert("密码不能为空，请输入密码！");
            from1.password.focus();
            return;
        }
        if(form1.validationCode.value==""){
            alert("验证码不能为空，请输入验证码！");
            from1.validationCode.focus();
            return;
        }
        form1.submit1();
    }
</script>
</head>
<body>
    <form action="loginCheck.jsp" name="form1" methed="post">
        用户名：<input type="text" name="userName" size="16"><br>
        密    码：<input type="password" name="password" size="16"><br>
        验证码：<input type="text" name="validationCode" size="6">
        <input type="hidden" name="validationCode1" value="<%=session.getAttribute("Vcode")%>">
        <img class="img_code" src="ValidateCodeServlet" id="code"/>
        <a href="javascript:changeCode()">换一张</a> <br>
        <input type="submit" name="submit1" value="登录" onClick="mycheck()">
    </form>
</body>
</html>

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
 
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;
 
@WebServlet("/ValidateCodeServlet")
public class ValidateCodeServlet extends HttpServlet{
    private static final long serialVersionUID = 1L;
 
    public ValidateCodeServlet() {
        super();
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
 
        doPost(request, response);
    }
 
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
 
        // 响应头信息
        response.setHeader("Pragma", "No-Cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expries", 0);
 
        // 随机数生成类
        Random random = new Random();
 
        // 定义验证码的位数
        int size = 4;
 
        // 定义变量保存生成的验证码
        String vCode = "";
        char c;
        // 产生验证码
        for (int i = 0; i < size; i++) {
            // 产生一个26以内的随机整数
            int number = random.nextInt(26);
            // 如果生成的是偶数，则随机生成一个数字
            if (number % 2 == 0) {
                c = (char) ('0' + (char) ((int) (Math.random() * 10)));
                // 如果生成的是奇数，则随机生成一个字母
            } else {
                c = (char) ((char) ((int) (Math.random() * 26)) + 'A');
            }
            vCode = vCode + c;
        }
 
        // 保存生成的5位验证码
        request.getSession().setAttribute("vCode", vCode);
 
        // 验证码图片的生成
        // 定义图片的宽度和高度
        int width = (int) Math.ceil(size * 15);
        int height = 30;
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        // 获取图片的上下文
        Graphics gr = image.getGraphics();
        // 设定图片背景颜色
        gr.setColor(Color.WHITE);
        gr.fillRect(0, 0, width, height);
        // 设定图片边框
        gr.setColor(Color.GRAY);
        gr.drawRect(0, 0, width - 1, height - 1);
        // 画十条干扰线
        for (int i = 0; i < 5; i++) {
            int x1 = random.nextInt(width);
            int y1 = random.nextInt(height);
            int x2 = random.nextInt(width);
            int y2 = random.nextInt(height);
            gr.setColor(randomColor());
            gr.drawLine(x1, y1, x2, y2);
        }
        // 设置字体，画验证码
        gr.setColor(randomColor());
        gr.setFont(randomFont());
        gr.drawString(vCode, 10, 22);
        // 图像生效
        gr.dispose();
        // 输出到页面
        ImageIO.write(image, "JPEG", response.getOutputStream());
 
    }
 
    // 生成随机的颜色
    private Color randomColor() {
        int red = r.nextInt(150);
        int green = r.nextInt(150);
        int blue = r.nextInt(150);
        return new Color(red, green, blue);
    }
 
    private String[] fontNames = { "宋体", "华文楷体", "黑体", "微软雅黑", "楷体_GB2312" };
    private Random r = new Random();
 
    // 生成随机的字体
    private Font randomFont() {
        int index = r.nextInt(fontNames.length);
        String fontName = fontNames[index];// 生成随机的字体名称
        int style = r.nextInt(4);
        int size = r.nextInt(3) + 15; // 生成随机字号, 24 ~ 28
        return new Font(fontName, style, size);
    }
}

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>处理登录页面数据</title>
</head>
<body>
<%
    request.setCharacterEncoding("UTF-8");
    String name=request.getParameter("userName");
    String pw=request.getParameter("password");
    //if(request.getParameter("validationCode").equals(request.getParameter("validationCode1"))){
        if(name.equals("zhang")&&(pw.equals("123456"))){
            session.setAttribute("userName",name);
            response.sendRedirect("main.jsp");
        }else{
            response.sendRedirect("Login.jsp");
        }
    //}else{
        //response.sendRedirect("Login.jsp");
    //}
%>
</body>
</html>
　　


<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>系统主页面</title>
</head>
<body>
<%
    String name=(String)session.getAttribute("userName");
%>
您好，<%=name%>欢迎访问！<br>
<a href="exit.jsp">[退出系统]</a>
</body>
</html>
　　


<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>退出系统</title>
</head>
<body>
<%
    session.invalidate();//销毁session
    response.sendRedirect("Login.jsp");
%>
</body>
</html>

posted @ 2020-05-10 22:24 Phil7 阅读(102) 评论(0) 收藏举报

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第五次作业

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