java 获取字符串或文件的md5值

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java 获取字符串或文件的md5,以下获取md5方式来自网络搜集,分享一下，就当笔记了

import java.io.*;import java.math.BigInteger;import java.security.MessageDigest;public class Md5Util {    private static MessageDigest md5 = null;    static {        try {            md5 = MessageDigest.getInstance("MD5");        } catch (Exception e) {            throw new RuntimeException(e);        }    }    public static String getMd5(String string) {        try {            byte[] bs = md5.digest(string.getBytes("UTF-8"));            StringBuilder sb = new StringBuilder(40);            for (byte x : bs) {                if ((x & 0xff) >> 4 == 0) {                    sb.append("0").append(Integer.toHexString(x & 0xff));                } else {                    sb.append(Integer.toHexString(x & 0xff));                }            }            return sb.toString();        } catch (UnsupportedEncodingException e) {            throw new RuntimeException(e);        }    }    public static String getMD5(File file) {        if (!file.isFile()) {            throw new RuntimeException(file.getName() + "is not a file!");        }        MessageDigest digest;        byte buffer[] = new byte[1024];        int len;        try (FileInputStream in = new FileInputStream(file)) {            digest = MessageDigest.getInstance("MD5");            while ((len = in.read(buffer, 0, 1024)) != -1) {                digest.update(buffer, 0, len);            }            in.close();        } catch (Exception e) {            throw new RuntimeException(e);        }        BigInteger bigInt = new BigInteger(1, digest.digest());        return bigInt.toString(16);    }    public static void main(String[] args) throws Exception {        System.out.println(getMd5("HelloWorld"));    }}

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