GetCaptcha.Java
- package servlet;
- import java.io.IOException;
- import javax.servlet.ServletException;
- import javax.servlet.ServletOutputStream;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import javax.servlet.http.HttpSession;
- import java.util.*;
- import java.awt.*;
- import java.awt.image.*;
- import javax.imageio.*;
- /**
- *
- * @author mzba
- *
- */
- public class GetCaptcha extends HttpServlet {
- private static final long serialVersionUID = 1L;
- /**
- * @see HttpServlet#HttpServlet()
- */
- public GetCaptcha() {
- super();
- // TODO Auto-generated constructor stub
- }
- /**
- * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
- * response)
- */
- protected void doGet(HttpServletRequest request,
- HttpServletResponse response) throws ServletException, IOException {
- //设置页面不缓存
- // hanzi(request, response) ;
- shuzi_zimu(request, response);
- }
- Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色
- Random random = new Random();
- if (fc > 255)
- fc = 255;
- if (bc > 255)
- bc = 255;
- int r = fc + random.nextInt(bc - fc);
- int g = fc + random.nextInt(bc - fc);
- int b = fc + random.nextInt(bc - fc);
- return new Color(r, g, b);
- }
- Color getRandColor(Random random, int fc, int bc) {
- if (fc > 255) {
- fc = 255;
- }
- if (bc > 255) {
- bc = 255;
- }
- int r = fc + random.nextInt(bc - fc);
- int g = fc + random.nextInt(bc - fc);
- int b = fc + random.nextInt(bc - fc);
- return new Color(r, g, b);
- }
- /**
- * 生成汉字
- * @param request
- * @param response
- * @throws IOException
- */
- public void hanzi(HttpServletRequest request, HttpServletResponse response) throws IOException{
- response.setHeader("Pragma","No-cache");
- response.setHeader("Cache-Control","no-cache");
- response.setDateHeader("Expires", 0);
- // 设置图片的长宽
- int width=176, height=30;
- //设置备选汉字,剔除一些不雅的汉字
- String base = "\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9\u4e0a\u7740\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50\u5f97\u4e5f\u548c\u90a3\u8981\u4e0b\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a\u597d\u8fd8\u591a\u6ca1\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea\u4ee5\u4e3b\u4f1a\u6837\u5e74\u60f3\u751f\u540c\u8001\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83\u540e\u7136\u8d70\u5f88\u50cf\u89c1\u4e24\u7528\u5979\u56fd\u52a8\u8fdb\u6210\u56de\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee\u4f46\u8eab\u65b9\u5b9e\u5403\u505a\u53eb\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168\u624d\u56db\u5df2\u6240\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d\u8bdd\u4e1c\u5e2d\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c\u4f7f\u5199\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0\u522b\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7\u8ddf\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd\u4fbf\u6597\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3\u6ee1\u65e5\u51b3\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb\u6cb3\u6751\u516b\u96be\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176\u4e66\u5750\u63a5\u5e94\u5173\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e\u4e89\u9886\u6216\u5e08\u7ed3\u5757\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u5f20\u56e2\u5c4b\u79bb\u8272\u8138\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531\u9001\u5207\u661f\u5bfc\u665a\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5\u5e76\u5e95\u6df1\u523b\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4\u9ed1\u544a\u754c\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c\u753b\u9020\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a\u83dc\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf\u91ce\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f\u80dc\u6559\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e\u4f55\u725b\u53d6\u5165\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c\u606f\u53e5\u533a\u8863\u822c\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6";
- //备选汉字的长度
- int length = base.length();
- //创建内存图像
- BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
- // 获取图形上下文
- Graphics g = image.getGraphics();
- //创建随机类的实例
- Random random = new Random();
- // 设定图像背景色(因为是做背景,所以偏淡)
- g.setColor(getRandColor(random,200,250));
- g.fillRect(0, 0, width, height);
- //备选字体
- String[] fontTypes = {"\u5b8b\u4f53","\u65b0\u5b8b\u4f53","\u9ed1\u4f53","\u6977\u4f53","\u96b6\u4e66"};
- int fontTypesLength = fontTypes.length;
- //在图片背景上增加噪点
- g.setColor(getRandColor(random,160,200));
- g.setFont(new Font("Times New Roman",Font.PLAIN,14));
- for (int i=0;i<6;i++)
- {
- g.drawString("*********************************************",0,5*(i+2));
- }
- //取随机产生的认证码(6个汉字)
- //保存生成的汉字字符串
- String sRand="";
- for (int i=0;i<6;i++)
- {
- int start = random.nextInt(length);
- String rand=base.substring(start,start+1);
- sRand+=rand;
- //设置字体的颜色
- g.setColor(getRandColor(random,10,150));
- //设置字体
- g.setFont(new Font(fontTypes[random.nextInt(fontTypesLength)],Font.BOLD,18 + random.nextInt(6)));
- //将此汉字画到图片上
- g.drawString(rand,24*i+ 10 + random.nextInt(8),24);
- }
- //将认证码存入session
- request.getSession().setAttribute("vcode",sRand);
- g.dispose();
- //输出图象到页面
- ImageIO.write(image, "JPEG", response.getOutputStream());
- }
- public void shuzi_zimu(HttpServletRequest request, HttpServletResponse response) throws IOException{
- response.setHeader("Pragma", "No-cache");
- response.setHeader("Cache-Control", "no-cache");
- response.setDateHeader("Expires", 0);
- // 在内存中创建图象
- int width = 80, height = 20;
- BufferedImage image = new BufferedImage(width, height,
- BufferedImage.TYPE_INT_RGB);
- // 获取图形上下文
- Graphics g = image.getGraphics();
- //生成随机类
- Random random = new Random();
- // 设定背景色
- g.setColor(getRandColor(200, 250));
- g.fillRect(0, 0, width, height);
- //设定字体
- g.setFont(new Font("Times New Roman", Font.BOLD, 18));
- //画边框
- g.setColor(new Color(0, 0, 0));
- g.drawRect(0, 0, width - 1, height - 1);
- // 随机产生155条干扰线,使图象中的认证码不易被其它程序探测到
- g.setColor(getRandColor(160, 200));
- for (int i = 0; i < 155; i++) {
- int x = random.nextInt(width);
- int y = random.nextInt(height);
- int xl = random.nextInt(12);
- int yl = random.nextInt(12);
- g.drawLine(x, y, x + xl, y + yl);
- }
- // 取随机产生的认证码(4位数字)
- String sRand = "";
- for (int i = 0; i < 4; i++) {
- String rand = null;
- //随机生成数字或者字母
- if (random.nextInt(10) > 5) {
- rand = String.valueOf((char)(random
- .nextInt(10) + 48));
- } else {
- rand = String.valueOf((char)(random
- .nextInt(26) + 65));
- }
- sRand += rand;
- // 将认证码显示到图象中
- g.setColor(new Color(random.nextInt(80), random
- .nextInt(80), random.nextInt(80)));
- //调用函数出来的颜色相同,可能是因为种子太接近,所以只能直接生成
- g.drawString(rand, 15 * i + 10, 16);
- }
- // 将认证码存入SESSION
- request.getSession().setAttribute("vcode", sRand);
- // 图象生效
- g.dispose();
- // 输出图象到页面
- ImageIO.write(image, "JPEG", response.getOutputStream());
- }
- }
ImageVail.java
- package servlet;
- import java.io.IOException;
- import java.io.PrintWriter;
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import javax.servlet.http.HttpSession;
- public class ImageVali extends HttpServlet {
- private static final long serialVersionUID = 1L;
- @Override
- public void doGet(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- String record = request.getParameter("record") ;
- HttpSession session = request.getSession() ;
- String vcode = (String)session.getAttribute("vcode") ;
- PrintWriter writer = response.getWriter() ;
- if(vcode.equalsIgnoreCase(record)){
- writer.println("success");
- }else{
- writer.println("failed");
- }
- }
- }
index.jsp
- <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
- <%
- String path = request.getContextPath();
- String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
- %>
- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
- <html>
- <head>
- <base href="<%=basePath%>">
- <title>My JSP 'index.jsp' starting page</title>
- <meta http-equiv="pragma" content="no-cache">
- <meta http-equiv="cache-control" content="no-cache">
- <meta http-equiv="expires" content="0">
- <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
- <meta http-equiv="description" content="This is my page">
- <!--
- <link rel="stylesheet" type="text/css" href="styles.css">
- -->
- <script type="text/javascript" src="js/jquery-1.4.js"></script>
- <script type="text/javascript">
- var data2 ;
- function vali(){
- var ss = $("#ss").val() ;
- $.ajax({
- async:true,
- dataType:"text",
- type:"GET",
- url:"ss",
- data:{record:ss},
- success:function(data){
- alert(data) ;
- data2 = data ;
- }
- }) ;
- }
- function aa(){
- alert(data2) ;
- return false ;
- }
- </script>
- </head>
- <body>
- <form method="get">
- <input type="text" id="ss" onblur="vali();"/>
- <img src="getcaptcha.sl" alt="验证码" name="checkImg" id="checkImg" style="position:relative; top:5px; left:20px; " onClick="document.getElementById('checkImg').src='getcaptcha.sl?temp='+ (new Date().getTime().toString(36)); return false"/>
- <input type="button" value="提交" onclick = "aa();">
- </form>
- </body>
- </html>
web.xml
- <?xml version="1.0" encoding="UTF-8"?>
- <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
- <servlet>
- <description>用于生成验证码</description>
- <display-name>生成验证码</display-name>
- <servlet-name>GetCaptcha</servlet-name>
- <servlet-class>servlet.GetCaptcha</servlet-class>
- </servlet>
- <servlet-mapping>
- <servlet-name>GetCaptcha</servlet-name>
- <url-pattern>/getcaptcha.sl</url-pattern>
- </servlet-mapping>
- <servlet>
- <servlet-name>checkData</servlet-name>
- <servlet-class>servlet.ImageVali</servlet-class>
- </servlet>
- <servlet-mapping>
- <servlet-name>checkData</servlet-name>
- <url-pattern>/ss</url-pattern>
- </servlet-mapping>
- </web-app>