用的是eclipse的JavaEE版本做的
出现的图片
在浏览器中显示不出来
验证的servlet 代码
public VerificationCodeServlet() {super();}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {response.setContentType("image/jpge");response.setHeader("Pragma","No-cache");response.setHeader("Cache-Control", "No-cache");response.setDateHeader("Expires", -1);OutputStream out = response.getOutputStream();int width=80,height=20;//定义画布对象 bufferedimage画布BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);//返回画布对象Graphics g = image.getGraphics();//定义随机数Random random = new Random();g.setColor(Color.gray);//用预设的颜色填充一个矩形 fill填充 fillrect填充矩形g.fillRect(0, 0, width, height);String sRand = "";for(int i=0;i<4;i++){//生出0-9的随机数String rand = String.valueOf(random.nextInt(10));sRand+=rand;g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110) ));g.drawString(rand, 20*i+6, 16);}g.dispose();ImageIO.write(image,"JPGE",response.getOutputStream());}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doGet(request, response);}
登录页面代码
<tr> <td ><font size="+4"><b>Hotel登录</b></font></td> </tr> <br><tr> <td ><font size="4px">用户名：</td> <td ><input id="userName" type="text" style="width:140px;height:22px;"></td></tr><br><tr> <td ><font color="dodgerblue"><font size="4px">密码：</td> <td ><input id="password" type="password" style="width:140px;height:22px;"></td> </tr> <br><tr><td ><font color="dodgerblue"><font size="4px">验证码：</td><td><input type="text" name="verification" style="width:140px;height:22px;"></td><td><img alt="" src="VerificationCodeServlet"></td></tr><br><tr > <td > <font color="dodgerblue">注册|忘记密码？</tr> <br><tr><td ><input type="submit" value="登 录" style="height: 35px; width:90px ;color:#FFFFFF;font-size: 16px;border-radius: 15%;background-color: #6495ED;"/> <input type="reset" value="重置" style="height: 35px; width:90px ;color:#FFFFFF;font-size: 16px;border-radius: 15%;background-color: #6495ED;"/></td></tr></table>
