Java TokenProcessor令牌校验工具类

关于tokenprocessor令牌校验工具类废话不多说了，直接给大家贴代码了，一切内容就在下面一段代码中，具体代码详情如下所示：

public class tokenprocessor {
 private long privious;// 上次生成表单标识号得时间值
 private static tokenprocessor instance = new tokenprocessor();
 public static string form_token_key = "form_token_key";
 private tokenprocessor() {
 }
 public static tokenprocessor getinstance() {
  return instance;
 }
 /**
  * 验证请求中得标识号是否有效，如果请求中的表单标识与当前用户session中的相同，返回结果true=
  */
 public synchronized boolean istokenvalid(httpservletrequest request) {
  // 为避免session对象不存在时候创建session对象
  httpsession session = request.getsession(false);
  if (session == null) {
   return false;
  }
  string saved = (string) session.getattribute(form_token_key);
  if (saved == null) {
   return false;
  }
  string token = (string) request.getparameter(form_token_key);
  if (token == null) {
   return false;
  }
  return saved.equals(token);
 }
 /**
  * 验证请求中得标识号是否有效，如果请求中的表单标识与当前用户session中的相同，返回结果true=
  */
 public synchronized boolean istokenvalid(httpservletrequest request,string token) {
  // 未避免session对象不存在时候创建session对象
  httpsession session = request.getsession(false);
  if (session == null) {
   return false;
  }
  string saved = (string) session.getattribute(form_token_key);
  if (saved == null) {
   return false;
  }
  if (token == null) {
   return false;
  }
  return saved.equals(token);
 }
 /**
  * 清除存储在当前用户session中的表单标识号
  */
 public synchronized void reset(httpservletrequest request) {
  httpsession session = request.getsession(false);
  if (session == null) {
   return;
  }
  session.removeattribute(form_token_key);
 }
 /**
  * 产生表单标识号并将之保存在当前用户得session中
  */
 public synchronized void savetoken(httpservletrequest request) {
  httpsession session = request.getsession();
  try {
   byte id[] = session.getid().getbytes();
   long current = system.currenttimemillis();
   if (current == privious) {
    current++;
   }
   privious = current;
   byte now[] = string.valueof(current).getbytes();
   messagedigest md = messagedigest.getinstance("md5");
   md.update(id);
   md.update(now);
   string token = tohex(md.digest());
   session.setattribute(form_token_key, token);
  } catch (nosuchalgorithmexception e) {
  }
 }
 /**
  * 将一个字节数转换成十六进制得字符串
  */
 public string tohex(byte buffer[]) {
  stringbuffer sb = new stringbuffer(buffer.length * 2);
  for (int i = 0; i < buffer.length; i++) {
   sb.append(character.fordigit((buffer[i] & 0x60) >> 4, 16));
   sb.append(character.fordigit(buffer[i] & 0x0f, 16));
  }
  return sb.tostring();
 }
}

以上所述是小编给大家介绍的java tokenprocessor令牌校验工具类，希望对大家有所帮助