1.Base64解密

1.1. 依赖

<!-- https://mvnrepository.com/artifact/commons-codec/commons-codec -->
    <dependency>
        <groupId>commons-codec</groupId>
        <artifactId>commons-codec</artifactId>
        <version>1.15</version>
    </dependency>

1.2. 解密

Base64 base64 = new Base64();
String sdkVersion = "NC4zOTEuMTI2Nw==";
System.out.println(new String(base64.decode(sdkVersion), "UTF-8"));

2. MD5加密

2.1. 依赖

<!-- https://mvnrepository.com/artifact/commons-codec/commons-codec -->
    <dependency>
        <groupId>commons-codec</groupId>
        <artifactId>commons-codec</artifactId>
        <version>1.15</version>
    </dependency>

2.2. 加密

String device = "31754c4b-e1c5-4cf3-a2b2-c3fa26350aed";
String md5 = DigestUtils.md5Hex(device);

System.out.println("原文：" + device);
System.out.println("MD5 ：" + md5);