Response3.java package com.hbsi.response;import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Random; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class Response3 extends HttpServlet { private static final int WIDTH=130; private static final int HEIGHT=30; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1.创建图片 BufferedImage image = new BufferedImage(WIDTH,HEIGHT,BufferedImage.TYPE_INT_RGB); //2.得到图片 Graphics g = image.getGraphics(); //3 对图片进行绘制//a.设置图片的背景色 setBackGround(g); //b.设置矩形边框 setBorder(g); //c.添加干扰线 setRandomLine(g); //g.向图形中写数据 setRandomNum(g); //4.把图片写给浏览器 //response.setHeader("content-type","image/jpeg"); response.setContentType("image/jpeg"); //告诉浏览器不要缓存 response.setHeader("Pragma", "no-cache"); response.setHeader("Cache-Control", "no-cache"); response.setIntHeader("Expires",-1) ImageIO.write(image,"JPEG",response.getOutputStream());} private void setRandomNum(Graphics g) { //g.setColor(Color.BLACK); g.setFont(new Font("宋体",Font.BOLD,20)); Random random = new Random(); //常用的字符编码集 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"; int x=10; for(int i=0;i<4;i++){ int rand = random.nextInt(base.length()-1); String str = base.charAt(rand)+""; g.setColor(new Color(random.nextInt(255),random.nextInt(255),random.nextInt(255))); int degree = random.nextInt()%30;((Graphics2D)g).rotate(degree*Math.PI/180, x, 20); g.drawString(str, x, 20);((Graphics2D)g).rotate(-degree*Math.PI/180, x, 20);x +=30;}} private void setRandomNum1(Graphics g) {//g.setColor(Color.BLACK); g.setFont(new Font("宋体",Font.BOLD,20)); Random random = new Random(); int x=10;for(int i=0;i<4;i++) { //产生随机数 String str = String.valueOf(random.nextInt(10)); g.setColor(new Color(random.nextInt(255),random.nextInt(255),random.nextInt(255))); int degree = random.nextInt()%30; ((Graphics2D)g).rotate(degree*Math.PI/180, x, 20); g.drawString(str, x, 20);((Graphics2D)g).rotate(-degree*Math.PI/180, x, 20); x +=30;}} private void setRandomLine(Graphics g) { g.setColor(Color.green); Random random = new Random(); 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); g.drawLine(x1, y1, x2, y2);}} private void setBorder(Graphics g) {g.setColor(Color.BLUE); g.drawRect(1, 1, WIDTH-2, HEIGHT-2);} private void setBackGround(Graphics g) {g.setColor(Color.WHITE); g.fillRect(0,0, WIDTH, HEIGHT);} public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}} validation.html <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>validation.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <!--<link rel="stylesheet" type="text/css" href="./styles.css">--> </head> <body> 用户名:<input type="text" name = "username"/><br/> 密码: <input type="text" name = "username"/><br/> 验证码: <input type="text" name = "validate" /> <img src ="/test/Response3" width ="115" height ="33"/> </body> </html>
效果如图:
好了不断刷新你就可以得到不同的验证码了,赶快自己动手试一试吧!