一、maven依耐:
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.10</version>
</dependency>
二、签名示例:
String key = UUID.randomUUID().toString().replaceAll("-", "");
System.out.println(key);//2f012e4a250a475199dbd665589e7445
String signData = "aa=111&bb=ccc&key=" + key;
String sign = DigestUtils.md5Hex(signData);
System.out.println(sign);//055c656aead59bd314a602f4300dc543