Java は SHA256 アルゴリズムを実装します

package com.wccy.obdwechatplatform.utils;

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

/**
 * sha加密工具类.
 */
public class SHAUtil {
    
    
    
    /**
     * 利用java原生的类实现SHA256加密
     *
     * @param str 加密后的报文
     * @return
     */
    public static String getSHA256(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();
    }
}