JavaUtils-MD5Utils.template

package com.sd.packagename.common.util;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;


/**
 * @Created with Atom
 * @author @author@
 * @time @now@
 * @description
 * md5 加密算法
 *
 **/

public class MD5Utils {
  public static String md5(String text) {
    MessageDigest digest = null;
    try {
      digest = MessageDigest.getInstance("md5");
      // 数组 byte[] result -> digest.digest( );  文本 text.getBytes();
      byte[] result = digest.digest(text.getBytes());
      //创建StringBuilder对象 然后建议StringBuffer，安全性高
      //StringBuilder sb = new StringBuilder();
      StringBuffer sb = new StringBuffer();
      // result数组，digest.digest ( ); -> text.getBytes();
      // for 循环数组byte[] result;
      for (byte b: result) {
        // 0xff 为16进制
        int number = b & 0xff;
        // number值 转换 字符串 Integer.toHexString( );
        String hex = Integer.toHexString(number);
        if (hex.length() == 1) {
          sb.append("0" + hex);
        } else {
          sb.append(hex);
        }
      }
      //sb StringBuffer sb = new StringBuffer();对象实例化
      return sb.toString();
    } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
      //发送异常return空字符串
      return "";
    }
  }
}