import java.io.IOException;import java.security.MessageDigest;import sun.misc.BASE64Encoder;import sun.misc.BASE64Decoder;public class MD5Util { /** * MD5加密 */ public static String md5Encryption(String str) { MessageDigest md5 = null; try { md5 = MessageDigest.getInstance("MD5"); } catch (Exception e) { System.out.println(e.toString()); e.printStackTrace(); return ""; } char[] charArray = str.toCharArray(); byte[] byteArray = new byte[charArray.length]; for (int i = 0; i < charArray.length; i++) byteArray[i] = (byte) charArray[i]; byte[] md5Bytes = md5.digest(byteArray); StringBuffer hexValue = new StringBuffer(); for (int i = 0; i < md5Bytes.length; i++) { int val = ((int) md5Bytes[i]) & 0xff; if (val < 16) hexValue.append("0"); hexValue.append(Integer.toHexString(val)); } return hexValue.toString(); } /** * base64加密 */ public static String base64Encryption(String str) { if (str == null) return null; String encodeStr = ""; try { BASE64Encoder b64Encoder = new BASE64Encoder(); encodeStr = b64Encoder.encode(str.getBytes()); } catch (Exception e) { e.printStackTrace(); } return encodeStr; } /** * base64解密 */ public static String base64Dcrypt(String str) { if (str == null) return null; String decoderStr = ""; try { BASE64Decoder decoder = new BASE64Decoder(); byte[] b = decoder.decodeBuffer(str); decoderStr = new String(b); } catch (IOException e) { e.printStackTrace(); return null; } return decoderStr; }}

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