地址栏加密解密

引用

package com.java.unit;

import java.io.ByteArrayOutputStream;

public class StringUtil {
	private static final String VERIABLY = 
		"abcdefghijklmnopqrstuvwxyz"+
		"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+
		".-*_";
	public static String urlEncode(
			String s, String charset) throws Exception {
		// abc
		byte[] bytes = 
			s.getBytes(charset);
		StringBuilder sb = new StringBuilder();		
		outer:
		for(int i=0;i<bytes.length;i++) {
			byte b = bytes[i];
			if(b == ' ') {
				sb.append('+');
				continue outer;
			}
			for(int j=0;j<VERIABLY.length();j++) {
				if(VERIABLY.charAt(j) == b) {
					sb.append((char) b);
					continue outer;
				}
			}			
			String hex = Integer.toHexString(b&0x000000ff);
			if(hex.length() == 1) hex = '0'+hex;
			hex = '%'+hex;
			sb.append(hex);			
		}
		return sb.toString();
	}
	
	public static String urlDecode(String s,String charset) throws Exception {
		ByteArrayOutputStream out = 
			new ByteArrayOutputStream();
		
		for(int i=0;i<s.length();i++) {
			char c = s.charAt(i);
			if(c == '%') {
				// %f8
				String hex = "";
				hex += s.charAt(++i);
				hex += s.charAt(++i);
				int n = Integer.parseInt(hex, 16);
				out.write(n);
			} else {
				if(VERIABLY.indexOf(c) != -1) {
					out.write(c);
					continue;
				}
				if('+' == c) {
					out.write(' ');
					continue;
				}
			}
		}
		byte[] data = out.toByteArray();
		return new String(data,charset);
	}
	
	public static void main(String[] args) throws Exception {
		String s = urlEncode("游戏","UTF-8");
		System.out.println(s);
		
		s = urlDecode("%e6%b8%b8%e6%88%8f", "UTF-8");
		System.out.println(s);
	}
}