Struts2中的图片验证码

1.Struts中建一个action

<action name="Code" class="LoginAction" method="code"><result name="success" type="stream">  <param name="contentType">image/jpeg</param> <param name="inputName">inputStream</param>  <param name="bufferSize">2048</param>		</result></action>

2.写Code.action

首先定义inputStream，并get，set

private ByteArrayInputStream inputStream;　

 public ByteArrayInputStream getInputStream() {return inputStream;}public void setInputStream(ByteArrayInputStream inputStream) {this.inputStream = inputStream;}

然后Code.action代码如下

 public String code() throws Exception {int WIDTH = 60;int HEIGHT = 20;HttpServletResponse response = ServletActionContext.getResponse();// 设置浏览器不要缓存此图片response.setHeader("Pragma", "no-cache");response.setHeader("Cache-Control", "no-cache");response.setDateHeader("Expires", 0);String str = "0123456789qwertyuiopasdfghjklzxcvbnm";char[] rand = new char[4];Random random = new Random();for (int i = 0; i < 4; i++){rand[i] = str.charAt(random.nextInt(36));}String rands =new String(rand);BufferedImage image = new BufferedImage(WIDTH, HEIGHT,BufferedImage.TYPE_INT_RGB);Graphics g = image.getGraphics();// 产生图像// 画背景g.setColor(new Color(0xDCDCDC));g.fillRect(0, 0, WIDTH, HEIGHT);// 随机产生 120 个干扰点for (int i = 0; i < 120; i++){int x = (int) (Math.random() * WIDTH);int y = (int) (Math.random() * HEIGHT);int red = (int) (Math.random() * 255);int green = (int) (Math.random() * 255);int blue = (int) (Math.random() * 255);g.setColor(new Color(red, green, blue));g.drawOval(x, y, 1, 0);}g.setColor(Color.BLACK);g.setFont(new Font(null, Font.ITALIC | Font.BOLD, 18));// 在不同的高度上输出验证码的每个字符g.drawString("" + rands.charAt(0), 1, 17);g.drawString("" + rands.charAt(1), 16, 15);g.drawString("" + rands.charAt(2), 31, 18);g.drawString("" + rands.charAt(3), 46, 16);System.out.println(rands);// 结束图像 的绘制 过程， 完成图像g.dispose();ByteArrayOutputStream outputStream = new ByteArrayOutputStream();ImageIO.write(image, "jpeg", outputStream);ByteArrayInputStream input = new ByteArrayInputStream(outputStream.toByteArray());this.setInputStream(input);HttpSession session = ServletActionContext.getRequest().getSession();session.setAttribute("checkCode", rands);input.close();outputStream.close();return SUCCESS;    	}

网页验证码图片不显示，3.jsp中调用

 <form id="form" action="Login.action" method="post"><table border=0 cellpadding="4"><tr><td><input type="text" name="username" placeholder="学号/工号/用户名" size="22" style="background-image: url(img/user.JPG);"><br></td></tr><tr><td><input type="password" name="password" placeholder="密码" size="22" style="background-image: url(img/password.JPG);"><br></td></tr><tr><td><input type="text" placeholder="验证码" name="checkCode" size="10"/>	<img alt="" src="Code.action" οnclick="this.src='Code.action?'+ Math.random();" title="点击图片刷新验证码"></td> </tr>    <tr><td><input type="submit" class="btnCheck" value="登录" οnclick="validate()" style="width:100%;"></button></td></tr></table></form>

4.在另一个action中验证

HttpSession session = ServletActionContext.getRequest().getSession();    String checkCode2 = (String)session.getAttribute("checkCode");System.out.println(checkCode+"aaa"+checkCode2);if(!checkCode.equals(checkCode2)){return "chekCodeerror";}

5.结果截图

 

验证码图片加载不出来，