字符串处理类

来源：互联网发布：tensorflow 指定显卡编辑：程序博客网时间：2024/05/17 06:59
import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.security.MessageDigest;/** * MD5加密工具类 */public class MD5EncoderUtil {    private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d",            "e", "f" };    private static String algorithm = "MD5";    public static String encode(String salt, String rawPass) {        return encode(rawPass.toLowerCase() + salt);    }    public static String encode(String rawPass) {        String result = null;        try {            MessageDigest md5 = MessageDigest.getInstance(algorithm);            // 加密后的字符串            result = byteArrayToHexString(md5.digest(rawPass.getBytes("utf-8")));        } catch (Exception ex) {            ex.printStackTrace();        }        return result;    }    public static String getFileMd5(File file) {        FileInputStream fileInputStream = null;        try {            MessageDigest md5 = MessageDigest.getInstance(algorithm);            fileInputStream = new FileInputStream(file);            byte[] buffer = new byte[8192];            int length;            while ((length = fileInputStream.read(buffer)) != -1) {                md5.update(buffer, 0, length);            }            return byteArrayToHexString(md5.digest());        } catch (Exception e) {            e.printStackTrace();            return null;        } finally {            if (fileInputStream != null) {                try {                    fileInputStream.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }    public static boolean isPasswordValid(String encPass, String loginName, String rawPass) {        String pass1 = encPass;        String pass2 = encode(loginName, rawPass);        return pass1.toUpperCase().equals(pass2.toUpperCase());    }    /*     * 转换字节数组为16进制字串     */    private static String byteArrayToHexString(byte[] b) {        StringBuffer resultSb = new StringBuffer();        for (int i = 0; i < b.length; i++) {            resultSb.append(byteToHexString(b[i]));        }        return resultSb.toString();    }    private static String byteToHexString(byte b) {        int n = b;        if (n < 0)            n = 256 + n;        int d1 = n / 16;        int d2 = n % 16;        return hexDigits[d1] + hexDigits[d2];    }}
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