guava生成字符串和文件的MD5

 

 

// 计算字符串MD5
String stringMD5 = Hashing.md5().hashString("helloWorld").toString();
// 计算文件MD5
File file = new File("hello.txt");
String fileMD5 = Files.asByteSource(file).hash(Hashing.md5()).toString();

 

参考guava的hash

public class HashTest {
    private static final String INPUT = "hello, world";

    public void test() {    
        // 计算MD5
        System.out.println(Hashing.md5().hashString(INPUT.getBytes()).toString());
        // 计算sha256
        System.out.println(Hashing.sha256().hashString(INPUT.getBytes()).toString());
        // 计算sha512
        System.out.println(Hashing.sha512().hashString(INPUT.getBytes()).toString());
        // 计算crc32
        System.out.println(Hashing.crc32().hashString(INPUT.getBytes()).toString());      
    }

}