JQuery + Struts2 生成验证码

-- 用于生成验证码

public class RandomNumUtil {      private ByteArrayInputStream image;// 图像      private String str;// 验证码      public RandomNumUtil() {         init();     }      private void init() {         // 在内存中创建图象         int width = 85, 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, 12));                  // 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(6位数字)         String sRand = "";         for (int i = 0; i < 6; i++) {             String rand = getVerify(random.nextInt(3));             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, random.nextInt(10) + 10);         }         // 赋值验证码         this.str = sRand;          // 图象生效         g.dispose();         ByteArrayInputStream input = null;         ByteArrayOutputStream output = new ByteArrayOutputStream();         try {             ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);             ImageIO.write(image, "JPEG", imageOut);             imageOut.close();             input = new ByteArrayInputStream(output.toByteArray());         } catch (Exception e) {             System.out.println("验证码图片产生出现错误：" + e.toString());         }          this.image = input;/* 赋值图像 */     }       /* 随机产生颜色 */       private Color getRandColor(int fc, int bc) {         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);     }          /**      * 生成验证码      * @param i 0为小写字母       * 1 为大写字母      * 2为普通数字      * @return      */     private String getVerify(int i){         String str = "";         if(i == 0){             char c = 'a';             c=(char)(c+(int)(Math.random()*26));             str = c + "";         }else if(i == 1){             char c='A';             c=(char)(c+(int)(Math.random()*26));             str = c + "";         }else if(i == 2){             str = new Random().nextInt(10) + "";         }         return str;     }      public ByteArrayInputStream getImage() {         return image;     }      public void setImage(ByteArrayInputStream image) {         this.image = image;     }      public String getStr() {         return str;     }      public void setStr(String str) {         this.str = str;     }

-- Struts2

public class UtilAction extends ActionSupport {      private ByteArrayInputStream inputStream;           @Override     public String execute() throws Exception {         // TODO Auto-generated method stub          RandomNumUtil rdnu = new RandomNumUtil();                   this.setInputStream(rdnu.getImage());//取得带有随机字符串的图片                   ActionContext.getContext().getSession().put("validateCode", rdnu.getStr());//取得随机字符串放入HttpSession              return SUCCESS;       }      public ByteArrayInputStream getInputStream() {         return inputStream;     }      public void setInputStream(ByteArrayInputStream inputStream) {         this.inputStream = inputStream;     } }

-- JQuery

$(function() {     $("#randomCode").attr("src","verify");     $("#refresh").click(         function() {             $("#randomCode").attr("src","verify");     }); })

-- Struts2 xml配置

<action name="verify" class="verify.UtilAction">      <result type="stream">                  <param name="contentType">image/jpeg</param>                       <param name="inputName">inputStream</param>                  </result>  </action>

-- jsp页面

<body>     <img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="" width=150 height="50" alt="验证码图片" id="randomCode" />     <span id="refresh" style="cursor: pointer;">换张图片</span> </body>

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