自定义拦截器实现防止重复提交

1、由于struts2标签的性能不好，项目组决定不使用，但是如果用struts2自带的拦截器防止重复提交又必须struts标签，所以只好自定拦器实现，具体步骤如下：新建拦截器类：public class TokenAtionInterceptor extends AbstractInterceptor public String intercept(ActionInvocation invocation) throws Exception Map session = invocation.getInvocationContext().getSession();HttpServletRequest

2、request = ServletActionContext.getRequest();String strGUID = RandomGUIDUtil.newGuid();/生成令牌String strRequestToken = (String)session.get(request_token);/取出会话中的令牌String strToken = request.getParameter(token);/页面中的令牌if(strRequestToken != null & !strRequestToken.equals(strToken)/重复提交，重置令牌session.put(req

3、uest_token, strGUID);request.setAttribute(token, strGUID);return invalidToken;session.put(request_token, strGUID);request.setAttribute(token, strGUID);return invocation.invoke();/否则正常运行建一个生成令牌的工具类：public class RandomGUIDUtil extends Object /* 日志管理类对象 */ private Logger logger = Logger.getLogger(this.

4、getClass().getName(); public String valueBeforeMD5 = ; public String valueAfterMD5 = ; private static Random myRand; private static SecureRandom mySecureRand; private static String s_id; /* * 静态块初始化 */ static mySecureRand = new SecureRandom(); long secureInitializer = mySecureRand.nextLong(); myRand

5、 = new Random(secureInitializer); try s_id = InetAddress.getLocalHost().toString(); catch (UnknownHostException e) System.out.println(构造带指定详细消息和嵌入异常!); public RandomGUIDUtil() throws Exception getRandomGUID(false); public RandomGUIDUtil(boolean secure) throws Exception getRandomGUID(secure); /* * 随机

6、生成GUID */ private void getRandomGUID(boolean secure) throws Exception MessageDigest md5 = null; StringBuffer sbValueBeforeMD5 = new StringBuffer(); try md5 = MessageDigest.getInstance(MD5); catch (NoSuchAlgorithmException e) logger.error(初始化MD5出错！); throw new NoSuchAlgorithmException(初始化MD5出错！); try

7、 long time = System.currentTimeMillis(); long rand = 0; if (secure) rand = mySecureRand.nextLong(); else rand = myRand.nextLong(); sbValueBeforeMD5.append(s_id); sbValueBeforeMD5.append(:); sbValueBeforeMD5.append(Long.toString(time); sbValueBeforeMD5.append(:); sbValueBeforeMD5.append(Long.toString

8、(rand); valueBeforeMD5 = sbValueBeforeMD5.toString(); md5.update(valueBeforeMD5.getBytes(); byte array = md5.digest(); StringBuffer sb = new StringBuffer(); for (int j = 0; j array.length; +j) int b = arrayj & 0xFF; if (b 0x10) sb.append(0); sb.append(Integer.toHexString(b); valueAfterMD5 = sb.toStr

9、ing(); catch (Exception e) logger.error(获得MD5加密码出错!); throw new Exception(初始化MD5出错！); /* * 生成一个GUID串 * return GUID * throws Exception */ public static String newGuid() throws Exception RandomGUIDUtil rdmGUID = new RandomGUIDUtil(); return rdmGUID.toString(); /* * 生成以主机串号、显卡串号、主板号，以保证唯一性的32位编码 */ pub

10、lic String toString() String raw = valueAfterMD5.toUpperCase(); StringBuffer sb = new StringBuffer(); sb.append(raw.substring(0, 8); sb.append(raw.substring(8, 12); sb.append(raw.substring(12, 16); sb.append(raw.substring(16, 20); sb.append(raw.substring(20); return sb.toString(); 在struts配置文件中对应的包下定义拦截器，注意顺序，package里元素必须按照一定的顺序排列。这个顺序 就是 result-types interceptors default-interceptor-ref default-action-ref default-class