testmd51.java

常用的java控件使用实例源代码

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

 class AmbowEncrypt
{
  public static String encodeByMD5(String strInfo)
  {
    MessageDigest alga;
    try
    {
      alga = MessageDigest.getInstance("MD5");
      alga.update(strInfo.getBytes());
      byte[] bytDigest = alga.digest();
      return byte2hex(bytDigest);
    } catch (NoSuchAlgorithmException ex) {
      System.out.println("非法摘要算法");

      return "";
    }
  }

  public static boolean equalByMD5(String strInfo, String strEncode)
  {
    MessageDigest alga;
    try
    {
    	//System.out.println("strInfo = " + strInfo);
      alga = MessageDigest.getInstance("MD5");
     alga.update(strInfo.getBytes());
      byte[] bytDigest = alga.digest();
      //System.out.println("strEncode = " + strEncode);
      //System.out.println("byDigest = " +bytDigest);
      //System.out.println("hexDigest =" +byte2hex(bytDigest));
      //System.out.println("hex2byte = " + hex2byte(strEncode));
      if (MessageDigest.isEqual(hex2byte(strEncode), bytDigest))
        return true;
    }
    catch (NoSuchAlgorithmException ex) {
      System.out.println("非法摘要算法");
    }
    return false;
  }

  private static byte[] hex2byte(String strHex)
  {
    String Digital = "0123456789ABCDEF";
    byte[] bytes = new byte[strHex.length() / 2];

    for (int i = 0; i < bytes.length; ++i) {
      int temp = Digital.indexOf(strHex.substring(2 * i, 2 * i + 1)) * 16;
      temp += Digital.indexOf(strHex.substring(2 * i + 1, 2 * i + 2));
      bytes[i] = (byte)(temp & 0xFF);
    }
    return bytes;
  }

  private static String byte2hex(byte[] b)
  {
    String hs = "";
    String stmp = "";
    for (int n = 0; n < b.length; ++n) {
      stmp = Integer.toHexString(b[n] & 0xFF);
      if (stmp.length() == 1) hs = hs + "0" + stmp;
      else hs = hs + stmp;
    }

    return hs.toUpperCase();
  }
}

public class testMd51 {
	public static void main(String[] agrs) {
		AmbowEncrypt  abe = new  AmbowEncrypt();
		String origin = "123456";
		String str = "E10ADC3949BA59ABBE56E057F20F883E";
		System.out.println(origin);
		System.out.println("摘要后的字符串：" + abe.encodeByMD5(origin));
		
		System.out.println(abe.equalByMD5(origin,str));
	}
}