ComputeHashValue.java

package practice.MeetingLottery;

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

public class ComputeHashValue {

    /**
    * 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 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();
   }


    public static void main(String[] args) {
        // System.out.println(ComputeHashValue.getSHA256StrJava("1605120224"));        //sha256加密测试
    }
}