MD5加密工具类 UTF-8编码格式签名 UTF-8编译和反编译

md5加密工具类,UTF-8编码格式：

public static String MD5(String string) {

  byte[] hash;         try {             hash = MessageDigest.getInstance("MD5").digest(string.getBytes("UTF-8"));         } catch (NoSuchAlgorithmException e) {             throw new RuntimeException("Huh, MD5 should be supported?", e);         } catch (UnsupportedEncodingException e) {             throw new RuntimeException("Huh, UTF-8 should be supported?", e);         }          StringBuilder hex = new StringBuilder(hash.length * 2);         for (byte b : hash) {             if ((b & 0xFF) < 0x10) hex.append("0");             hex.append(Integer.toHexString(b & 0xFF));         }         return hex.toString();  }

UTF-8反编译：

String a="app_package_name%3Dcom.flyhand.yunpos";

String b=URLDecoder.decode(a, "UTF-8");

UTF-8编译：

String c="abcd";

String d=URLEncoder.encode(c, "utf-8");