Java生成图片验证码

悠悠女儿香 · 发表于 2009-1-22 16:49:34

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import java.io.*; import java.net.*; import javax.servlet.*; import javax.servlet.http.*; import java.awt.*; import java.awt.image.*; import java.util.*; import javax.imageio.*; /** * * @author http://www.tot.name * @version */ public class Image extends HttpServlet { /** Processes requests for both HTTP <code>GET</code> and <code>

OST</code> methods. * @param request servlet request * @param response servlet response */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("image/jpeg"); response.setHeader("Pragma","No-cache"); response.setHeader("Cache-Control","no-cache"); response.setDateHeader("Expires", 0); HttpSession session=request.getSession(); // 在内存中创建图象 int width=60, 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.PLAIN,18)); //画边框 //g.setColor(new Color()); //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=String.valueOf(random.nextInt(10)); sRand =rand; // 将认证码显示到图象中 g.setColor(new Color(20 random.nextInt(110),20 random.nextInt(110),20 random.nextInt(110)));//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,13*i 6,16); } // 将认证码存入SESSION session.setAttribute("rand",sRand); // 图象生效 g.dispose(); ServletOutputStream responseOutputStream =response.getOutputStream(); // 输出图象到页面 ImageIO.write(image, "JPEG", responseOutputStream); //以下关闭输入流！ responseOutputStream.flush(); responseOutputStream.close(); } 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); } // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the sign on the left to edit the code."> /** Handles the HTTP <code>GET</code> method. * @param request servlet request * @param response servlet response */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** Handles the HTTP <code>

OST</code> method. * @param request servlet request * @param response servlet response */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** Returns a short description of the servlet. */ public String getServletInfo() { return "Short description"; } // </editor-fold> } [1] [2] ---------------使用验证码图片的文件---------index.jsp------------------------------------ <%@ page contentType="text/html;charset=gb2312" %> <!DOCTYPE HTML PUBLIC "-//W 3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>认证码输入页面</title> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <META HTTP-EQUIV="Pragma" CONTENT="no-cache"> <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"> <META HTTP-EQUIV="Expires" CONTENT="0"> </head> <body> <form method=post action="check.jsp"> <table> <tr> <td align=left>系统产生的认证码：</td> <td><img border=0 src="http://www.zhmy.com/image"></td> </tr> <tr> <td align=left>输入上面的认证码：</td> <td><input type=text name=rand maxlength=4 value=""></td> </tr> <tr> <td colspan=2 align=center><input type=submit value="提交检测"></td> </tr> </form> </body> </html> -----------------验证的页面----------check.jsp------------------------------ <%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %> <html> <head> <title>认证码验证页面</title> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <META HTTP-EQUIV="Pragma" CONTENT="no-cache"> <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"> <META HTTP-EQUIV="Expires" CONTENT="0"> </head> <body> <% String rand = (String)session.getAttribute("rand"); String input = request.getParameter("rand"); %> 系统产生的认证码为： <%= rand %><br/> 您输入的认证码为： <%= input %><br/> <br/> <% if (rand.equals(input)) { %> <font color=green>输入相同，认证成功！</font> <% } else { %> <font color=red>输入不同，认证失败！</font> <% } %> </body> </html> 上一页 [1] [2]

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Java生成图片验证码

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