java图形验证码生成工具类 web页面校验验证码

import javax.imageio.ImageIO; import java.awt.*; import java.awt.image.BufferedImage; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.Date; import java.util.Random;  /**  * 验证码生成器  *  * @author  */ public class ValidateCode {  // 图片的宽度。  private int width = 160;  // 图片的高度。  private int height = 40;  // 验证码字符个数  private int codeCount = 5;  // 验证码干扰线数  private int lineCount = 150;  // 验证码  private String code = null;  // 验证码图片Buffer  private BufferedImage buffImg = null;   // 验证码范围,去掉0(数字)和O(拼音)容易混淆的(小写的1和L也可以去掉,大写不用了)  private char[] codeSequence = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',    'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',    'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9'};   /**   * 默认构造函数,设置默认参数   */  public ValidateCode() {   this.createCode();  }   /**   * @param width 图片宽   * @param height 图片高   */  public ValidateCode(int width, int height) {   this.width = width;   this.height = height;   this.createCode();  }   /**   * @param width  图片宽   * @param height 图片高   * @param codeCount 字符个数   * @param lineCount 干扰线条数   */  public ValidateCode(int width, int height, int codeCount, int lineCount) {   this.width = width;   this.height = height;   this.codeCount = codeCount;   this.lineCount = lineCount;   this.createCode();  }   public void createCode() {   int x = 0, fontHeight = 0, codeY = 0;   int red = 0, green = 0, blue = 0;    x = width / (codeCount + 2);//每个字符的宽度(左右各空出一个字符)   fontHeight = height - 2;//字体的高度   codeY = height - 4;    // 图像buffer   buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);   Graphics2D g = buffImg.createGraphics();   // 生成随机数   Random random = new Random();   // 将图像填充为白色   g.setColor(Color.WHITE);   g.fillRect(0, 0, width, height);   // 创建字体,可以修改为其它的   Font font = new Font("Fixedsys", Font.PLAIN, fontHeight); //  Font font = new Font("Times New Roman", Font.ROMAN_BASELINE, fontHeight);   g.setFont(font);    for (int i = 0; i < lineCount; i++) {    // 设置随机开始和结束坐标    int xs = random.nextInt(width);//x坐标开始    int ys = random.nextInt(height);//y坐标开始    int xe = xs + random.nextInt(width / 8);//x坐标结束    int ye = ys + random.nextInt(height / 8);//y坐标结束     // 产生随机的颜色值，让输出的每个干扰线的颜色值都将不同。    red = random.nextInt(255);    green = random.nextInt(255);    blue = random.nextInt(255);    g.setColor(new Color(red, green, blue));    g.drawLine(xs, ys, xe, ye);   }    // randomCode记录随机产生的验证码   StringBuffer randomCode = new StringBuffer();   // 随机产生codeCount个字符的验证码。   for (int i = 0; i < codeCount; i++) {    String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);    // 产生随机的颜色值，让输出的每个字符的颜色值都将不同。    red = random.nextInt(255);    green = random.nextInt(255);    blue = random.nextInt(255);    g.setColor(new Color(red, green, blue));    g.drawString(strRand, (i + 1) * x, codeY);    // 将产生的四个随机数组合在一起。    randomCode.append(strRand);   }   // 将四位数字的验证码保存到Session中。   code = randomCode.toString();  }   public void write(String path) throws IOException {   OutputStream sos = new FileOutputStream(path);   this.write(sos);  }   public void write(OutputStream sos) throws IOException {   ImageIO.write(buffImg, "png", sos);   sos.close();  }   public BufferedImage getBuffImg() {   return buffImg;  }   public String getCode() {   return code;  }   /**   * 测试函数,默认生成到d盘   * @param args   */  public static void main(String[] args) {   ValidateCode vCode = new ValidateCode(160,40,5,150);   try {    String path="D:/"+new Date().getTime()+".png";    System.out.println(vCode.getCode()+" >"+path);    vCode.write(path);   } catch (IOException e) {    e.printStackTrace();   }  } } 

// 刷新图片   function changeImg() {    var imgSrc = $("#imgObj");    var url = imgSrc.attr("src");    imgSrc.attr("src", changeUrl(url));   }   //为了使每次生成图片不一致，即不让浏览器读缓存，所以需要加上时间戳   function changeUrl(url) {    var timestamp = (new Date()).valueOf();    var index = url.indexOf("?");    console.log(index);    if (index > 0) {     url = url.substring(0, url.indexOf("?"));    }    console.log(url);    if ((url.indexOf("&") > 0)) {     url = url + "×tamp=" + timestamp;     console.log(url);    } else {     url = url + "?timestamp=" + timestamp;     console.log(url);     }    return url;   } 

/**  * 响应验证码页面  * @return  */ @RequestMapping(value="/validateCode") public String validateCode(HttpServletRequest request,HttpServletResponse response) throws Exception{  // 设置响应的类型格式为图片格式  response.setContentType("image/jpeg");  //禁止图像缓存。  response.setHeader("Pragma", "no-cache");  response.setHeader("Cache-Control", "no-cache");  response.setDateHeader("Expires", 0);   HttpSession session = request.getSession();   ValidateCode vCode = new ValidateCode(120,40,5,100);  session.setAttribute("code", vCode.getCode());  vCode.write(response.getOutputStream());  return null; } 

String code = request.getParameter("code"); HttpSession session = request.getSession(); String sessionCode = (String) session.getAttribute("code"); if (!StringUtils.equalsIgnoreCase(code, sessionCode)) { //忽略验证码大小写  throw new RuntimeException("验证码对应不上code=" + code + " sessionCode=" + sessionCode); }