以下代码：将传参按照ASCII 码字典序排序，并将生成的字符串进行MD5加密
/**
* Description:MD5工具生成token
* @param value
* @return
*/
public String getMD5Value(String value){
try {
MessageDigest messageDigest = MessageDigest.getInstance("MD5");
byte[] md5ValueByteArray = messageDigest.digest(value.getBytes());
BigInteger bigInteger = new BigInteger(1 , md5ValueByteArray);
return bigInteger.toString(16).toUpperCase();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* 生成签名
* @param map
* @return
*/
public String getSignToken(Map<String, String> map) {
String result = "";
try {
List<Map.Entry<String, String>> infoIds = new ArrayList<Map.Entry<String, String>>(map.entrySet());
// 对所有传入参数按照字段名的 ASCII 码从小到大排序（字典序）
Collections.sort(infoIds, new Comparator<Map.Entry<String, String>>() {
public int compare(Map.Entry<String, String> o1, Map.Entry<String, String> o2) {
return (o1.getKey()).toString().compareTo(o2.getKey());
}
});
// 构造签名键值对的格式
StringBuilder sb = new StringBuilder();
for (Map.Entry<String, String> item : infoIds) {
if (item.getKey() != null || item.getKey() != "") {
String key = item.getKey();
String val = item.getValue();
if (!(val == "" || val == null)) {
sb.append(key + "=" + val + "&");
}
}
}
result = sb.toString();
//进行MD5加密
result = getMD5Value(result);
} catch (Exception e) {
return null;
}
return result;
}