英文，数字和中文混合的彩色验证码实现

package com; import java.awt.BasicStroke; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.geom.AffineTransform; import java.awt.geom.Line2D; 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; import javax.servlet.http.HttpSession; public class PictureCheckCode extends HttpServlet{ /** * */ private static final long serialVersionUID = 1L; public PictureCheckCode() { super(); // TODO Auto-generated constructor stub } @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub //设置不缓存图片 response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "No-cache"); response.setDateHeader("Expires", 0); //指定生成的响应图片 response.setContentType("image/jpeg"); int width=86; //指定生成验证码的宽度 int height=22; //指定生成验证码的高度 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics(); Graphics2D g2d = (Graphics2D)g; //创建Graphics2D对象 Random random = new Random(); Font mFont = new Font("黑体", Font.BOLD, 16); //定义字体样式 g.setColor(getRandColor(200, 250)); g.fillRect(0, 0, width, height); //绘制背景 g.setFont(mFont); //设置字体 g.setColor(getRandColor(180, 200)); //绘制100根位置和色彩全部为随机产生的线条，该线条为2f for (int i = 0; i < 100; i++) { int x = random.nextInt(width⑴); int y = random.nextInt(height⑴); int x1 = random.nextInt(6)+1; int y1 = random.nextInt(12)+1; BasicStroke bs = new BasicStroke(2f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); Line2D line = new Line2D.Double(x,y,x+x1,y+y1); g2d.setStroke(bs); g2d.draw(line); //绘制直线 } //输出由英文，数字和中文随机组成的验证文字，具体的组合方式根据生成随机数肯定 String sRand = ""; //输出随机的验证文字 String ctmp = ""; int itmp = 0; for(int i = 0;i<4;i++){ //random = new Random(new java.util.Date().getTime()+i); switch (random.nextInt(4)) { case 1: itmp = random.nextInt(26)+65; //生成A~Z的字母 ctmp = String.valueOf((char)itmp); break; case 2://生成汉字 String[] rBase = {"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"}; //生成第1位的区码 int r1 = random.nextInt(3)+11; //生成11~14之间的随机数 String str_r1 = rBase[r1]; //生成第2位的区码 int r2; if(r1==13){ r2 = random.nextInt(7); //生成0~7之间的随数 }else{ r2 = random.nextInt(16); //生成0~16之间的随机数 } String str_r2 = rBase[r2]; //生成第1位的位码 int r3 = random.nextInt(6)+10; //生成10~16之间的随机数 String str_r3 = rBase[r3]; //生成第2位的位码 int r4; if(r3==10){ r4 = random.nextInt(15)+1; //生成1~16之间的随机数 }else if(r3==15){ r4 = random.nextInt(15); //生成0~15之间的随机数 }else { r4 = random.nextInt(16); //生成0~16之间的随机数 } String str_r4 = rBase[r4]; //将生成的机内码转换为汉字 byte[] bytes = new byte[2]; //将生成的区码保存到字节数组的第1个元素中 String str_r12 = str_r1+str_r2; int tempLow=Integer.parseInt(str_r12,16); bytes[0] = (byte)tempLow; //将生成的位码保存到字节数组的第2个元素中 String str_r34 = str_r3+str_r4; int tempHigh = Integer.parseInt(str_r34,16); bytes[1] = (byte)tempHigh; ctmp = new String(bytes); //根据字节数组生成汉字 break; default: itmp = random.nextInt(10)+48; //生成0~9的数字 ctmp = String.valueOf((char)itmp); break; } sRand+=ctmp; Color color = new Color(20+random.nextInt(110), 20+random.nextInt(110), 20+random.nextInt(110)); g.setColor(color); //将生成的随机数进行随机缩放病旋转指定角度 //将文字旋转指定角度 Graphics2D g2d_word = (Graphics2D)g; AffineTransform trans = new AffineTransform(); trans.rotate(random.nextInt(45)*3.14/180,15*i+8,7); //缩放文字 float scaleSize = random.nextFloat()+0.8f; if(scaleSize>1f){ scaleSize = 1f; } trans.scale(scaleSize, scaleSize); g2d_word.setTransform(trans); g.drawString(ctmp, 15*i+18, 14); } //将生成的验证码保存道session中 HttpSession session = request.getSession(true); session.setAttribute("randCheckCode", sRand); //输诞生成的验证码图片 g.dispose(); ImageIO.write(image, "JPEG", response.getOutputStream()); } @Override public void destroy() { // TODO Auto-generated method stub super.destroy(); } @Override public void init() throws ServletException { // TODO Auto-generated method stub super.init(); } public Color getRandColor(int s,int e){ Random random = new Random(); if(s>255)s = 255; if(e>255)e = 255; int r = s+random.nextInt(e-s); int g = s+random.nextInt(e-s); int b = s+random.nextInt(e-s); return new Color(r, g, b); } }

<?xml version="1.0" encoding="UTF⑻"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>CheckCode</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>PictureCheckCode</servlet-name> <servlet-class>com.PictureCheckCode</servlet-class> </servlet> <servlet-mapping> <servlet-name>PictureCheckCode</servlet-name> <url-pattern>/PictureCheckCode</url-pattern> </servlet-mapping> </web-app>

<%@ page language="java" contentType="text/html; charset=utf⑻" pageEncoding="utf⑻"%> <!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=utf⑻"> <title>Insert title here</title> <script type="text/javascript"> function myReload() { document.getElementById("createCheckCode").src=document.getElementById("createCheckCode").src+"?nocache"+new Date().getTime(); } </script> </head> <body style="text-align: center;"> 验证码：<input name="checkCode" type="text" id="checkCode" title="验证码辨别大小写" size="8" maxlength="4"> <img src="PictureCheckCode" id="createCheckCode" onclick="myReload()"> <a href="#" onclick="myReload()"> 看不清？换1个</a> </body> </html>

<%@ page language="java" contentType="text/html; charset=utf⑻" pageEncoding="utf⑻"%> <!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=utf⑻"> <title>Insert title here</title> <% String checkCode = request.getParameter("checkCode"); if("".equals(checkCode)||checkCode==null){ out.println("<script>alert('请输入验证码!');window.location.href='index.jsp';</script>"); }else{ if(!checkCode.equals(session.getAttribute("randCheckCode"))){ out.println("<script>alert('您输入的验证码不正确！');history.back(⑴);</script>"); } } %> </head> <body> </body> </html>

float scaleSize = random.nextFloat()+0.8f; if(scaleSize>1f)scaleSize = 1f; trans.scale(scaleSize, scaleSize);