加密解密类

import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;

import org.apache.commons.codec.StringEncoder;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.digest.DigestUtils;

public class EncodingUtil {
	
	private static char[] m = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
	/**
	 * 
	 * enc(ISO-8859-1)转UTF-8
	 * @param s
	 * @param enc:ISO-8859-1
	 * @return
	 */
	public static String toUTF8(String s,String enc){
		if (s==null) {
			return null;
		}
		Charset charset = Charset.forName(enc);
		CharsetEncoder ce = charset.newEncoder();
		if (ce.canEncode(s)) {
			try {
				String t = new String(s.getBytes(enc),"UTF-8");
				return t;
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
				return s;
			}
		}else{
			return s;
		}
	}
	/**
	 * base64加密
	 * @param text
	 * @return
	 */
	public static String encodeBase64(String text) {
		byte[] b = text.getBytes();
		Base64 base64 = new Base64();
		String s = new String(base64.encode(b));
		return s;
	}
	/**
	 * base64解密
	 * @param text
	 * @return
	 */
	public static String decodeBase64(String encodeStr) {
		byte[] b = encodeStr.getBytes();
		Base64 base64 = new Base64();
		String s = new String(base64.decode(b));
		return s;
	}
	/**
	 * MD5加密
	 * @param text
	 * @return
	 */
	public static String toMD5(String text){
		return DigestUtils.md5Hex(text);
	}
	/**
	 * SHA加密
	 * @param text
	 * @return
	 */
	public static String toSHA(String text){
//		DigestUtils.sha256Hex(text);  
//		DigestUtils.sha384Hex(text);  
//		DigestUtils.sha512Hex(text);  
		return DigestUtils.shaHex(text);
	}
	/**
	 * 位移加密char
	 * @param c
	 * @param move
	 * @return
	 */
	private static int encodeMove(char c,int move){
		int index = -1;
		int i = c;
		if (i>47&&i<58) {//0-9
			index = i-48;
//			System.out.println(c+"--"+m[i-48]);
		}else if (i>64&&i<91) {//A-Z
			index = i-55;
//			System.out.println(c+"--"+m[i-55]);
		}else if (i>96&&i<123) {//a-z
			index = i-61;
//			System.out.println(c+"--"+m[i-61]);
		}else {
			return -1;
		}
		if (index>-1) {//肯定执行
			int a = index+move;
			int b = a%62;
			return b;
		}
		return -1;
	}
	/**
	 * 位移解密char
	 * @param c
	 * @param move
	 * @return
	 */
	private static int decodeMove(char c,int move){
		int index = -1;
		int i = c;
		if (i>47&&i<58) {//0-9
			index = i-48;
//			System.out.println(c+"--"+m[i-48]);
		}else if (i>64&&i<91) {//A-Z
			index = i-55;
//			System.out.println(c+"--"+m[i-55]);
		}else if (i>96&&i<123) {//a-z
			index = i-61;
//			System.out.println(c+"--"+m[i-61]);
		}else {
			return -1;
		}
		if (index>-1) {//肯定执行
			int a = 62+index-move;
			int b = a%62;
			return b;
		}
		return -1;
	}
	/**
	 * 位移加密
	 * @param text
	 * @param count：位移距离
	 */
	public static String encode(String text,int count){
		char[]cs = text.toCharArray();
		StringBuffer sb = new StringBuffer();
		for (char c : cs) {
			int i = encodeMove(c, count);
			char a = m[i];
			sb.append(a);
		}
		return sb.toString();
	}
	/**
	 * 位移解密
	 * @param text
	 * @param count
	 * @return
	 */
	public static String decode(String text,int count){
		char[]cs = text.toCharArray();
		StringBuffer sb = new StringBuffer();
		for (char c : cs) {
			int i = decodeMove(c, count);
			char a = m[i];
			sb.append(a);
		}
		return sb.toString();
	}
	public static void main(String[] args) {
//		System.out.println(toUTF8("æ²¹", "iso-8859-1"));
//		System.out.println(decodeBase64(encodeBase64("中国")));
//		System.out.println(new String(DigestUtils.md5Hex("123456")));
		System.out.println((int)'0');//48-48=0
		System.out.println((int)'A');//65-10=55
		System.out.println((int)'Z');//
		System.out.println((int)'a');//97-36=61
		System.out.println((int)'z');//
		String t = "adfs345678190AZGHJHafsffz";
		char[]cs = t.toCharArray();
		StringBuffer sb = new StringBuffer();
		for (char c : cs) {
//			int i = c;
//			if (i>47&&i<58) {
//				System.out.println(c+"--"+m[i-48]);
//			}else if (i>64&&i<91) {
//				System.out.println(c+"--"+m[i-55]);
//			}else if (i>96&&i<123) {
//				System.out.println(c+"--"+m[i-61]);
//			}
//			System.out.println(c+"--"+m[moveEncode(c, 1)]+"--"+m[moveDecode(m[moveEncode(c, 1)], 1)]);
		}
		System.out.println(decode(encode("shiu76582hrhuhHFDHKJS", 2),2));
//		System.out.println(-2%10);
		
	}
}