Java常用加密工具 ( MD5,sha1,SHA256)

package com.xy.boot.cmiap.util;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.codec.Charsets;
import org.apache.commons.codec.binary.Hex;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Scanner;

/**
 * 加密工具
 * 常見的几种加密方式 MD5,sha1,a;
 *
 * Created by fuwenshen
 * Date:2018/11/1
 * Time:14:14
 */
@Slf4j
public class EncryptUtil {
    public static void main(String[] args) {
        log.debug("请输入要加密内容！");
       Scanner sc = new Scanner(System.in, String.valueOf(Charsets.UTF_8));
        String next = sc.next(); //123
        String md5str = string2MD5(next); 	  			//202CB962AC59075B964B07152D234B70
        String sha1str = string2Sha1(next);   			//40bd001563085fc35165329ea1ff5c5ecbdbbeef
        String sha256str = string2SHA256(next); 			//a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae3
        String sha256Javastr = string2SHA256StrJava(next);    //a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae3
        System.out.println("next：" +next);
        System.out.println("md5str:"+md5str);
        System.out.println("sha1str:"+sha1str);
        System.out.println("sha256str:"+sha256str);
        System.out.println("sha256Javastr："+sha256Javastr);
    }


    /**
     * MD5加密 生成32位md5码
     */
    public static String string2MD5(String inStr){
        MessageDigest md5 = null;
        try{
            md5 = MessageDigest.getInstance("MD5");
        }catch (Exception e){
            System.out.println(e.toString());
            e.printStackTrace();
            return "";
        }
        char[] charArray = inStr.toCharArray();
        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++)
            byteArray[i] = (byte) charArray[i];
        byte[] md5Bytes = md5.digest(byteArray);
        StringBuffer hexValue = new StringBuffer();
        for (int i = 0; i < md5Bytes.length; i++){
            int val = ((int) md5Bytes[i]) & 0xff;
            if (val < 16)
                hexValue.append("0");
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString().toUpperCase();
    }

    /**
     * SHA1加密
     * @param str
     * @return
     */
    public static String string2Sha1(String str){
        if(str==null||str.length()==0){
            return null;
        }
        char hexDigits[] = {'0','1','2','3','4','5','6','7','8','9',
                'a','b','c','d','e','f'};
        try {
            MessageDigest mdTemp = MessageDigest.getInstance("SHA1");
            mdTemp.update(str.getBytes("UTF-8"));

            byte[] md = mdTemp.digest();
            int j = md.length;
            char buf[] = new char[j*2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                buf[k++] = hexDigits[byte0 >>> 4 & 0xf];
                buf[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(buf);
        } catch (Exception e) {
            log.error("e",e);
            return null;
        }
    }

    /**
     *  利用Apache的工具类实现SHA-256加密
     *  所需jar包下載 http://pan.baidu.com/s/1nuKxYGh
     * @param str 加密后的报文
     * @return
     */
    public static String string2SHA256(String str){
        MessageDigest messageDigest;
        String encodeStr = "";
        try {
            messageDigest = MessageDigest.getInstance("SHA-256");
            byte[] hash = messageDigest.digest(str.getBytes("UTF-8"));
            encodeStr = Hex.encodeHexString(hash);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return encodeStr;
    }
    //---------
    /**
     * 利用java原生的摘要实现SHA256加密
     * @param str 加密后的报文
     * @return
     */
    public static String string2SHA256StrJava(String str){
        MessageDigest messageDigest;
        String encodeStr = "";
        try {
            messageDigest = MessageDigest.getInstance("SHA-256");
            messageDigest.update(str.getBytes("UTF-8"));
            encodeStr = byte2Hex(messageDigest.digest());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return encodeStr;
    }

    /**
     * 将byte转为16进制
     * @param bytes
     * @return
     */
    private static String byte2Hex(byte[] bytes){
        StringBuffer stringBuffer = new StringBuffer();
        String temp = null;
        for (int i=0;i<bytes.length;i++){
            temp = Integer.toHexString(bytes[i] & 0xFF);
            if (temp.length()==1){
                //1得到一位的进行补0操作
                stringBuffer.append("0");
            }
            stringBuffer.append(temp);
        }
        return stringBuffer.toString();
    }
}