前言

一、API接口采用sign签名访问认证

1.签名访问

	签名访问是指调用方在请求域名时，必须附带一个签名字符串参数，该字符串是用一个算法生成的，具有不可逆性，系统接收到这个签名时，会采用同样算法生成一个新签名，并与之进行对比，如果结果相同，说明参数在传递过程中没有被修改过，是安全可信的。具体签名方法如下：
1. 过滤掉sign字符串参数，以及其它参数中的空值，得到一个待签名参数数组；
2. 对待签名参数进行排序，排序方式：按照参数key值升序排列；
3. 将数组中所有元素按照"key=value"的模式，用"&"字符拼成字符串；
4. 将拼接后的字符串再与私钥用"&"字符连接起来；
5. 将最终的字符串进行md5（32位，不区分大小写），得到32位的签名字符串；

2.案例

			//进行加密签名认证//时间戳String stamp = String.valueOf(System.currentTimeMillis() / 1000);String signStr1 = "参数1" + "=" + customerCode + "&" + "参数2" + "=" + organizationCode + "&" + "stamp" + "=" + stamp;String signStr2 = "&" + "参数3" + "=" + version + "&" + 参数4;String signStr = (signStr1 + signStr2).replace(" ", "");//MD5加密String sign = MD5Utils.MD5(signStr).toLowerCase();String requestUrl = tsRegisterPatientUrl + "?" + signStr1 + "&" + "sign" + "=" + sign + "&" + "version" + "=" + version;

3.header

Map<String, String> header = new HashMap<>();
header.put("Accept", "application/json");

4.发送httpClient.doPost()请求

	HttpClientResult response = HttpClientUtils.doPost(requestUrl, header, JSONObject.toJSONString(param));

5. MD5Utils

/*** 类名：MD5Utils * 用途说明：MD5Utils算法* 业务区分(加密算法)*/
public class MD5Utils {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 };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 bufferprivate byte[] digest = new byte[16];public String getMD5ofStr(String inbuf) {md5Init();md5Update(inbuf.getBytes(), inbuf.length());md5Final();String digestHexStr = "";for (int i = 0; i < 16; i++) {digestHexStr += byteHEX(digest[i]);}return digestHexStr;}public MD5Utils() {md5Init();return;}private void md5Init() {count[0] = 0L;count[1] = 0L;// /* Load magic initialization constants.state[0] = 0x67452301L;state[1] = 0xefcdab89L;state[2] = 0x98badcfeL;state[3] = 0x10325476L;return;}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��II������F,G,H,I���н�һ���任 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��MD5���������̣�inbuf��Ҫ�任���ֽڴ���inputlen�dz��ȣ����* ������getMD5ofStr���ã�����֮ǰ��Ҫ����md5init����˰�����Ƴ�private��*/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�������д������*/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��һ���ڲ�ʹ�õ�byte����Ŀ鿽�������input��inpos��ʼ��len���ȵ�* �ֽڿ�����output��outposλ�ÿ�ʼ*/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��MD5���ı任������md5Update���ã�block�Ƿֿ��ԭʼ�ֽ�*/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��long���鰴˳����byte���飬��Ϊjava��long������64bit�ģ� ֻ���32bit������ӦԭʼCʵ�ֵ���;*/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��byte���鰴˳��ϳɳ�long���飬��Ϊjava��long������64bit�ģ�* ֻ�ϳɵ�32bit����32bit���㣬����ӦԭʼCʵ�ֵ���;*/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����д��һ����byte���ղ�������ŵ�ԭ��ģ���λ��������Ϊjavaû��unsigned����*/public static long b2iu(byte b) {return b < 0 ? b & 0x7F + 128 : b;}/** byteHEX()sprintf(outbuf,"%02X",ib)*/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 MD5(String source) {MD5Utils md5 = new MD5Utils();return md5.getMD5ofStr(source);}public static void main(String args[]) {String str=MD5Utils.MD5("1234567890");System.out.println(str);}
}

总结

附录：
https://www.cnblogs.com/whcghost/p/5657594.html