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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; }
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 src="http://www.mamicode.com/Code.action" onclick="this.src=http://www.mamicode.com/‘Code.action?‘+ Math.random();" title="点击图片刷新验证码">
</td> </tr>
<tr><td><input type="submit" class="btnCheck" value="http://www.mamicode.com/登录" onclick="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
Struts2中的图片验证码
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