java如何实现前端的CryptoJS.SHA256加密方法

Question

var zdwwsignature = CryptoJS.SHA256(timestamp + 'fTN2pfuisxTavbTuYVSsNJHetwq5bJvC' + 'QkjjtiLM2dCratiA' + timestamp)
    .toString(CryptoJS.enc.Hex)
    .toUpperCase();

Answer 1

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

public class SHA256 {
    
    /**
     *  利用java原生的摘要实现SHA256加密
     * @param str 加密后的报文
     * @return 密文
     */
    public static String getSHA256StrJava(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();
    }
}