java实现对文件内容md5加密

talk is cheap, show you the code

import javax.xml.bind.DatatypeConverter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class TestMD5 {
    public static void main(String[] args) {
        String filePath = "/data/test/xxxx.bin";
        File file = new File(filePath);
        Long filelength = file.length();
        byte[] filecontent = new byte[filelength.intValue()];
        try {
            FileInputStream in = new FileInputStream(file);
            in.read(filecontent);
            in.close();
            byte[] secretBytes = MessageDigest.getInstance("md5").digest(filecontent);
            System.out.println(DatatypeConverter.printHexBinary(secretBytes)); //将byte数组转为十六进制字符串);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
    }
}