md5.java

来自「中国电信isag短信部分源码和ismp部分源码」· Java 代码 · 共 50 行

package test;
import java.security.*;
import javax.crypto.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2006</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class MD5 {
  public MD5() {}

  public static String byte2hex(byte[] b) {
    String hs = "";
    String stmp = "";
    for (int n = 0; n < b.length; n++) {
      stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
      if (stmp.length() == 1)
        hs = hs + "0" + stmp;
      else
        hs = hs + stmp;
    }
    //System.out.println("--------" + hs.toUpperCase());
    return hs.toUpperCase();
  }

  public static String MD5Crypt(String s) {
    try {
      byte[] strTemp = s.getBytes();
      //System.out.println("--------" + s);
      MessageDigest mdTemp = MessageDigest.getInstance("MD5");
      mdTemp.update(strTemp);
      byte[] md = mdTemp.digest();
      return byte2hex(md);
    }
    catch (Exception e) {
      return null;
    }
  }

  public static void main(String[] args) {
    MD5 test = new MD5();
    System.out.print(test.MD5Crypt("中兴"));
  }

}