防重复接口请求

package com.qz.springcloud.school.brain.core.repeat;


import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisCluster;

/**
 * @description 防止表单重复提交拦截器
 */
@Component
@Order(1)
@Aspect
public class DuplicateSubmitAspect
{
    private Logger log = LoggerFactory.getLogger(DuplicateSubmitAspect.class);

    private final StringRedisTemplate redisTemplate;

    public static final String DUPLICATE_TOKEN_KEY = "duplicate-token-key";

    public static final String REDIS_LOCK_KEY_TEMPLATE = "qz:server:duplicate-token-key:lock_%s";
    

    public DuplicateSubmitAspect(StringRedisTemplate redisTemplate)
    {
        this.redisTemplate = redisTemplate;
    }

    /**
     * com.qz.springcloud.school.brain.controller
     */
    @Pointcut("execution(public * com.qz.springcloud.school.brain.controller..*(..))")
    public void webLog()
    {
    }

    @Before("webLog() && @annotation(token)")
    public void before(final JoinPoint joinPoint, DuplicateSubmitToken token)
    {
        // 需要集成redis后实现
        /*if (token != null)
        {
            ServletRequestAttributes attributes = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();
            HttpServletRequest request = attributes.getRequest();

            boolean isSaveSession = token.save();
            if (isSaveSession)
            {
                String key = getDuplicateTokenKey(joinPoint, request);

                final Long locked = redisTemplate.execute((RedisCallback<Long>)connection -> {
                    Object nativeConnection = connection.getNativeConnection();
                    // 集群模式和单机模式虽然执行脚本的方法一样，但是没有共同的接口，所以只能分开执行
                    // 集群模式
                    if (nativeConnection instanceof JedisCluster)
                    {
                        return (Long)((JedisCluster)nativeConnection).eval(getRedisLockScript(),
                            Collections.singletonList(String.format(REDIS_LOCK_KEY_TEMPLATE, key)),
                            Arrays.asList(key, String.valueOf(token.time() / 1000)));
                    }
                    // 单机模式
                    else if (nativeConnection instanceof Jedis)
                    {
                        return (Long)((Jedis)nativeConnection).eval(getRedisLockScript(),
                            Collections.singletonList(String.format(REDIS_LOCK_KEY_TEMPLATE, key)),
                            Arrays.asList(key, String.valueOf(token.time() / 1000)));
                    }
                    return 0L;
                });
                if (locked == 0)
                {
                    log.info("请求过于频繁");
                    log.info("客户地址:{}  请求地址：{} 请求方式 {}",
                        request.getRemoteHost(),
                        request.getRequestURL().toString(),
                        request.getMethod());
                    log.info("params:{} ", request.getParameterMap().toString());
                    throw new DuplicateSubmitException("请求过于频繁");
                }
            }

        }*/
    }

    /**
     * 获取重复提交key
     *
     * @param joinPoint
     * @return
     */
    public String getDuplicateTokenKey(JoinPoint joinPoint, HttpServletRequest request)
    {

        String url = request.getRemoteAddr() + request.getServletPath();

        String params = "";
        // 表单中获取参数
        Map<String, String[]> parameterMap = request.getParameterMap();
        if (!parameterMap.isEmpty())
        {
            params = JSON.toJSONString(parameterMap);
        }

        // 获取用户信息token
        String userToken = request.getHeader("X-Access-Token");

        // 获取body参数
        String args = toString(parseArgs(joinPoint.getArgs()));
        params += args;

        String md5Key = MD5.toMD5(userToken + url + params);
        return md5Key;
    }

    private String toString(Object obj)
    {
        return obj == null ? "null" : JSONObject.toJSONString(obj);
    }

    private List<Object> parseArgs(Object[] args)
    {
        List<Object> lists = new ArrayList<>();
        for (Object obj : args)
        {
            if (obj instanceof ServletRequest || obj instanceof ServletResponse)
            {
                continue;
            }
            lists.add(obj);
        }
        if (lists.size() == 0)
        {
            HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes())
                .getRequest();
            lists.add(request.getParameterMap());
        }
        return lists;
    }

    @AfterReturning("webLog() && @annotation(token)")
    public void doAfterReturning(JoinPoint joinPoint, DuplicateSubmitToken token)
    {
        // 处理完请求，返回内容
        log.info("出方法：");
    }

    /**
     * 异常
     *
     * @param joinPoint
     * @param e
     * @param token
     */
    @AfterThrowing(pointcut = "webLog()&& @annotation(token)", throwing = "e")
    public void doAfterThrowing(JoinPoint joinPoint, Throwable e, DuplicateSubmitToken token)
    {
    }

    private String getRedisLockScript()
    {
        return "if redis.call('setnx',KEYS[1],ARGV[1]) == 1 then "
            + " redis.call('expire',KEYS[1],ARGV[2]) return 1 else return 0 end";
    }
}








package com.qz.springcloud.school.brain.core.repeat;


/**
 * 重复提交异常
 */
public class DuplicateSubmitException extends RuntimeException {
    public DuplicateSubmitException(String msg) {
        super(msg);
    }

    public DuplicateSubmitException(String msg, Throwable cause){
        super(msg,cause);
    }
    
}

















package com.qz.springcloud.school.brain.core.repeat;


import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;  
import java.lang.annotation.Retention;  
import java.lang.annotation.RetentionPolicy;  
import java.lang.annotation.Target;  

/**
 * @description 防止表单重复提交注解
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@Documented
public @interface  DuplicateSubmitToken {
    /**
     * 一次请求完成之前防止重复提交
     */
    public static final int REQUEST=1;
    
    /**
     * 一次会话中防止重复提交
     */
    public static final int SESSION=2;
    
    /**
     * 重复请求标识缓存时间
     */
    public static long TIMETOLIVE=5000;

    /**
     * 保存重复提交标记 默认为需要保存
     * @return
     */
    boolean save() default true;

    /**
     * 防止重复提交类型，默认：一次请求完成之前防止重复提交
     * @return
     */
    int type() default REQUEST;
    
    /**
     * 获取重复请求标识缓存时间,单位：毫秒
     * @return
     */
    long time() default TIMETOLIVE;
}














package com.qz.springcloud.school.brain.core.repeat;


/**
 * MD5加密类
 * 
 * @author Administrator
 */
public class MD5 {
    /* 下面这些S11-S44实际上是一个4*4的矩阵，在原始的C实现中是用#define 实现的，
    这里把它们实现成为static final是表示了只读，切能在同一个进程空间内的多个
    Instance间共享*/
    static final int S11 = 7;
    static final int S12 = 12;
    static final int S13 = 17;
    static final int S14 = 22;

    static final int S21 = 5;
    static final int S22 = 9;
    static final int S23 = 14;
    static final int S24 = 20;

    static final int S31 = 4;
    static final int S32 = 11;
    static final int S33 = 16;
    static final int S34 = 23;

    static final int S41 = 6;
    static final int S42 = 10;
    static final int S43 = 15;
    static final int S44 = 21;

    static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
    /* 下面的三个成员是MD5计算过程中用到的3个核心数据，在原始的C实现中
    被定义到MD5_CTX结构中

    */
    private long[] state = new long[4];  // state (ABCD)
    private long[] count = new long[2];  // number of bits, modulo 2^64 (lsb first)
    private byte[] buffer = new byte[64]; // input buffer

    /* digestHexStr是MD5的唯一一个公共成员，是最新一次计算结果的
    　 16进制ASCII表示.
    */
    private String digestHexStr;

    /* digest,是最新一次计算结果的2进制内部表示，表示128bit的MD5值.
    */
    private byte[] digest = new byte[16];

    /*
    类MD5最主要的公共方法，入口参数是你想要进行MD5变换的字符串
    返回的是变换完的结果，这个结果是从公共成员digestHexStr取得的．
    */
    public String md5(String inbuf) {
        md5Init();
        md5Update(inbuf.getBytes(), inbuf.length());
        md5Final();
        digestHexStr = "";
        for (int i = 0; i < 16; i++) {
            digestHexStr += byteHEX(digest[i]);
        }
        //return digestHexStr.substring(8,24);   //16位md5
        return digestHexStr;                    //32位md5
    }

    public MD5() {
        md5Init();

        return;
    }
    /* md5Init是一个初始化函数，初始化核心变量，装入标准的幻数 */
    private void md5Init() {
        count[0] = 0L;
        count[1] = 0L;


        state[0] = 0x67452301L;
        state[1] = 0xefcdab89L;
        state[2] = 0x98badcfeL;
        state[3] = 0x10325476L;

        return;
    }
    /* F, G, H ,I 是4个基本的MD5函数， */

    private long F(long x, long y, long z) {
        return (x & y) | ((~x) & z);

    }
    private long G(long x, long y, long z) {
        return (x & z) | (y & (~z));

    }
    private long H(long x, long y, long z) {
        return x ^ y ^ z;
    }

    private long I(long x, long y, long z) {
        return y ^ (x | (~z));
    }

    /*
    FF,GG,HH和II将调用F,G,H,I进行近一步变换
    FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
    Rotation is separate from addition to prevent recomputation.
    */

    private long FF(long a, long b, long c, long d, long x, long s, long ac) {
        a += F (b, c, d) + x + ac;
        a = ((int) a << s) | ((int) a >>> (32 - s));
        a += b;
        return a;
    }

    private long GG(long a, long b, long c, long d, long x, long s, long ac) {
        a += G (b, c, d) + x + ac;
        a = ((int) a << s) | ((int) a >>> (32 - s));
        a += b;
        return a;
    }
    private long HH(long a, long b, long c, long d, long x, long s, long ac) {
        a += H (b, c, d) + x + ac;
        a = ((int) a << s) | ((int) a >>> (32 - s));
        a += b;
        return a;
    }
    private long II(long a, long b, long c, long d, long x, long s, long ac) {
        a += I (b, c, d) + x + ac;
        a = ((int) a << s) | ((int) a >>> (32 - s));
        a += b;
        return a;
    }
    /*
    md5Update是MD5的主计算过程，inbuf是要变换的字节串，inputlen是长度，这个
    函数由md5调用，调用之前需要调用md5init，因此把它设计成private的
    */
    private void md5Update(byte[] inbuf, int inputLen) {

        int i, index, partLen;
        byte[] block = new byte[64];
        index = (int)(count[0] >>> 3) & 0x3F;
        // /* Update number of bits */
        if ((count[0] += (inputLen << 3)) < (inputLen << 3))
            count[1]++;
        count[1] += (inputLen >>> 29);

        partLen = 64 - index;
        // Transform as many times as possible.
        if (inputLen >= partLen) {
            md5Memcpy(buffer, inbuf, index, 0, partLen);
            md5Transform(buffer);
            for (i = partLen; i + 63 < inputLen; i += 64) {
                md5Memcpy(block, inbuf, 0, i, 64);
                md5Transform (block);
            }
            index = 0;
        }
        else
            i = 0;
        ///* Buffer remaining input */
        md5Memcpy(buffer, inbuf, index, i, inputLen - i);

    }

    /*
    md5Final整理和填写输出结果
    */
    private void md5Final () {
        byte[] bits = new byte[8];
        int index, padLen;
        ///* Save number of bits */
        Encode (bits, count, 8);
        ///* Pad out to 56 mod 64.
        index = (int)(count[0] >>> 3) & 0x3f;
        padLen = (index < 56) ? (56 - index) : (120 - index);
        md5Update (PADDING, padLen);
        ///* Append length (before padding) */
        md5Update(bits, 8);
        ///* Store state in digest */
        Encode (digest, state, 16);
    }

    /* md5Memcpy是一个内部使用的byte数组的块拷贝函数，从input的inpos开始把len长度的
    字节拷贝到output的outpos位置开始
    */

    private void md5Memcpy (byte[] output, byte[] input, int outpos, int inpos, int len) {
        int i;
        for (i = 0; i < len; i++)
            output[outpos + i] = input[inpos + i];
    }

    /*
    md5Transform是MD5核心变换程序，有md5Update调用，block是分块的原始字节
    */
    private void md5Transform (byte block[]) {
        long a = state[0], b = state[1], c = state[2], d = state[3];
        long[] x = new long[16];
        Decode (x, block, 64);

        /* Round 1 */
        a = FF (a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
        d = FF (d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
        c = FF (c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
        b = FF (b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
        a = FF (a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
        d = FF (d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
        c = FF (c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
        b = FF (b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
        a = FF (a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
        d = FF (d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
        c = FF (c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
        b = FF (b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
        a = FF (a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
        d = FF (d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
        c = FF (c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
        b = FF (b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */
        /* Round 2 */
        a = GG (a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
        d = GG (d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
        c = GG (c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
        b = GG (b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
        a = GG (a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
        d = GG (d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
        c = GG (c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
        b = GG (b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
        a = GG (a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
        d = GG (d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
        c = GG (c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
        b = GG (b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
        a = GG (a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
        d = GG (d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
        c = GG (c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
        b = GG (b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */
        /* Round 3 */
        a = HH (a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
        d = HH (d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
        c = HH (c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
        b = HH (b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
        a = HH (a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
        d = HH (d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
        c = HH (c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
        b = HH (b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
        a = HH (a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
        d = HH (d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
        c = HH (c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
        b = HH (b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
        a = HH (a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
        d = HH (d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
        c = HH (c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
        b = HH (b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */
        /* Round 4 */
        a = II (a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
        d = II (d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
        c = II (c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
        b = II (b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
        a = II (a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
        d = II (d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
        c = II (c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
        b = II (b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
        a = II (a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
        d = II (d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
        c = II (c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
        b = II (b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
        a = II (a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
        d = II (d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
        c = II (c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
        b = II (b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */
        state[0] += a;
        state[1] += b;
        state[2] += c;
        state[3] += d;

    }

    /*Encode把long数组按顺序拆成byte数组，因为java的long类型是64bit的，只拆低32bit
    */
    private void Encode (byte[] output, long[] input, int len) {
        int i, j;
        for (i = 0, j = 0; j < len; i++, j += 4) {
            output[j] = (byte)(input[i] & 0xffL);
            output[j + 1] = (byte)((input[i] >>> 8) & 0xffL);
            output[j + 2] = (byte)((input[i] >>> 16) & 0xffL);
            output[j + 3] = (byte)((input[i] >>> 24) & 0xffL);
        }
    }

    /*Decode把byte数组按顺序合成成long数组，因为java的long类型是64bit的，
    只合成低32bit，高32bit清零
    */
    private void Decode (long[] output, byte[] input, int len) {
        int i, j;
        for (i = 0, j = 0; j < len; i++, j += 4)
            output[i] = b2iu(input[j]) | (b2iu(input[j + 1]) << 8) |(b2iu(input[j + 2]) << 16) | (b2iu(input[j + 3]) << 24);
        return;
    }

    /*
    b2iu是一个把byte按照不考虑正负号的原则的＂升位＂程序，因为java没有unsigned运算
    */
    public static long b2iu(byte b) {
        return b < 0 ? b & 0x7F + 128 : b;
    }

    /*byteHEX()，用来把一个byte类型的数转换成十六进制的ASCII表示，
    　因为java中的byte的toString无法实现这一点
    */
    public static String byteHEX(byte ib) {
        char[] Digit = { '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f' };
        char [] ob = new char[2];
        ob[0] = Digit[(ib >>> 4) & 0X0F];
        ob[1] = Digit[ib & 0X0F];
        String s = new String(ob);
        return s;
    }

    public static String toMD5(String source){
            MD5 md5 = new MD5();
            return md5.md5(source);
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.print(MD5.toMD5(""));
    }
}








ServerApplication 加入扫描包路径
    "com.qz.springcloud.school.brain.core.repeat", 
    
示例

    @DuplicateSubmitToken(type=DuplicateSubmitToken.REQUEST,time=10000 * 1) // 10秒钟