package com.lofter.svntesr;import java.io.UnsupportedEncodingException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;/** * 采用MD5加密解密 *  * @author tfq * @datetime 2011-10-13 */public class MD5Test {	/***	 * MD5加码 生成32位md5码	 */	public static String string2MD5(String inStr) {		MessageDigest md5 = null;		try {			md5 = MessageDigest.getInstance("MD5");		} catch (Exception e) {			System.out.println(e.toString());			e.printStackTrace();			return "";		}		char[] charArray = inStr.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();	}	/**	 * 加密解密算法 执行一次加密，两次解密	 */	public static String convertMD5(String inStr) {		char[] a = inStr.toCharArray();		for (int i = 0; i < a.length; i++) {			a[i] = (char) (a[i] ^ 't');		}		String s = new String(a);		return s;	}	// 测试主函数	public static void main(String args[]) {		String s = new String("a");		System.out.println("原始：" + s);		System.out.println("MD5后：" + string2MD5(s));		System.out.println("加密的：" + convertMD5(s));		System.out.println("解密的：" + convertMD5(convertMD5(s)));	}}