import org.springframework.stereotype.Component;
 
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Component
public @interface DataValidate {
 
}

import java.security.MessageDigest;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.concurrent.ConcurrentHashMap;
 
import javax.annotation.PreDestroy;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.MethodParameter;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
 
import com.alibaba.fastjson.JSON;
 
/**
 * 防数据被篡改和重复提交
 */
 
public class DataValidateInterceptor extends HandlerInterceptorAdapter implements Runnable {
 
 public static Map<String, TokenValue> userToken = new ConcurrentHashMap<>();
 
 // 过期时间
 private static long EXPIRED_TIME = 3600000;
 
 private static String TOKEN_NAME = "token";
 
 private static String SIGN_NAME = "sign";
 
 private volatile boolean shutDown;
 
 public DataValidateInterceptor(@Value("${data_interceptor.expired_time}") String expiredTime,
 @Value("${data_interceptor.token_name}") String tokenName,
 @Value("${data_interceptor.sign_name}") String signName) {
 if (null != expiredTime && !"".equals(expiredTime)) {
 EXPIRED_TIME = Long.parseLong(expiredTime);
 }
 if (null != tokenName && !"".equals(tokenName)) {
 TOKEN_NAME = tokenName;
 }
 if (null != signName && !"".equals(signName)) {
 SIGN_NAME = signName;
 }
 }
 
 @Override
 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
 throws Exception {
 if (validate(request, response, handler)) {
 /**
 * 实现返回提示数据
 */
 response.setContentType("application/json");
 response.setCharacterEncoding("UTF-8");
 response.getWriter().write("参数验证失败!");
 return false;
 }
 return true;
 }
 
 private boolean validate(HttpServletRequest request, HttpServletResponse response, Object handler) {
 
 if (handler instanceof HandlerMethod) {
 Class<?> clazz = ((HandlerMethod) handler).getBeanType();
 DataValidate dataValidate = clazz.getAnnotation(DataValidate.class);
 if (null == dataValidate) {
 dataValidate = ((HandlerMethod) handler).getMethodAnnotation(DataValidate.class);
 }
 
 if (dataValidate != null) {
 MethodParameter[] methodParameters = ((HandlerMethod) handler).getMethodParameters();
 if (null == methodParameters || methodParameters.length <=0) {
  // 方法没有入参不需要校验
  return false;
 }
 
 // 需要校验
 String sign = request.getParameter(SIGN_NAME);
 Map<String, String[]> params = request.getParameterMap();
 Set<String> paramNames = params.keySet();
 Map<String, String> paramsMap = new TreeMap<>();
 for (String paramName : paramNames) {
  if (paramName.equals(SIGN_NAME)) {
  continue;
  }
  paramsMap.put(paramName, request.getParameter(paramName));
 }
 String paramString = JSON.toJSONString(paramsMap).replaceAll(" ", "");
 String MD5Sign = MD5.getMD5(paramString);
 if (!sign.equals(MD5Sign)) {
  // 数据被篡改
  return true;
 }
 
 String token = request.getParameter(TOKEN_NAME);
 if (token != null) {
  if (userToken.containsKey(token)) {
  TokenValue tokenValue = userToken.get(token);
  if (tokenValue.getValue().equals(sign)) {
  // 数据已经提交过
  return true;
  } else {
  tokenValue.setValue(sign);
  }
  } else {
  userToken.put(token, new TokenValue(sign));
  }
 }
 
 }
 }
 return false;
 }
 
 @Override
 public void run() {
 try {
 while (!shutDown) {
 synchronized (this) {
  wait(EXPIRED_TIME);
  Set<String> keys = userToken.keySet();
  for (String key : keys) {
  if ((userToken.get(key).getExpiredTime() + EXPIRED_TIME) <= System.currentTimeMillis()) {
  userToken.remove(key);
  }
  }
 }
 }
 } catch (Exception e) {
 e.printStackTrace();
 }
 }
 
 @PreDestroy
 public void custDestroy() {
 shutDown = true;
 synchronized (this) {
 notifyAll();
 }
 }
 
 private static class MD5 {
 
 /**
  * 向getMD5方法传入一个你需要转换的原始字符串，将返回字符串的MD5码
  * 
  * @param code 原始字符串
  * @return 返回字符串的MD5码
  */
  private static String getMD5(String code) {
   try {
    MessageDigest messageDigest = MessageDigest.getInstance("MD5");
 
    byte[] bytes = code.getBytes();
 
    byte[] results = messageDigest.digest(bytes);
 
    StringBuilder stringBuilder = new StringBuilder();
 
    for (byte result : results) {
     // 将byte数组转化为16进制字符存入stringbuilder中
     stringBuilder.append(String.format("%02x", result));
    }
 
    return stringBuilder.toString();
   } catch (Exception e) {
    e.printStackTrace();
    return "";
   }
  }
 }
 
}
 
public class TokenValue {
 
 private String value;
 private long expiredTime;
 
 public TokenValue(String value) {
 this.value = value;
 this.expiredTime = System.currentTimeMillis();
 }
 
 public String getValue() {
 return value;
 }
 public void setValue(String value) {
 this.value = value;
 this.expiredTime = System.currentTimeMillis();
 }
 public long getExpiredTime() {
 return expiredTime;
 }
}