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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 Md5Utils {
       /**     * @param path     *    文件的路径     * @return     *    文件的MD5值     */    public static String getFileMD5(String path){        StringBuilder mess = new StringBuilder();        try {            FileInputStream fis = new FileInputStream(new File(path));            //获取MD5加密器            MessageDigest md = MessageDigest.getInstance("MD5");            byte[] buffer = new byte[10240];            int len = fis.read(buffer);            while (len != -1) {                md.update(buffer, 0, len);                //继续读取                len = fis.read(buffer);            }            byte[] digest = md.digest();            for (byte b : digest){                //把每个字节转成16进制数                  int d = b & 0xff;// 0x000000ff                String hexString = Integer.toHexString(d);                if (hexString.length() == 1) {
  //字节的高4位为0                    hexString = "0" + hexString;                }                hexString = hexString.toUpperCase();                mess.append(hexString);//把每个字节对应的2位十六进制数当成字符串拼接一起            }        } catch (NoSuchAlgorithmException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return mess + "";    }    public static String md5(String str){        StringBuilder mess = new StringBuilder();        try {            //获取MD5加密器            MessageDigest md = MessageDigest.getInstance("MD5");            byte[] bytes = str.getBytes();            byte[] digest = md.digest(bytes);            for (byte b : digest){                //把每个字节转成16进制数                  int d = b & 0xff;// 0x000000ff                String hexString = Integer.toHexString(d);                if (hexString.length() == 1) {
  //字节的高4位为0                    hexString = "0" + hexString;                }                mess.append(hexString);//把每个字节对应的2位十六进制数当成字符串拼接一起            }        } catch (NoSuchAlgorithmException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return mess + "";    }}

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