直接贴代码

package com.opzoon.app.airchina.util;

public class TextEncoding {

	public String toStrings(String s) {
		StringBuffer sbuf = new StringBuffer();
		int l = s.length();
		int ch = -1;
		int b, sumb = 0;
		for (int i = 0, more = -1; i < l; i++) {
			/* Get next byte b from URL segment s */
			switch (ch = s.charAt(i)) {
			case '%':
				ch = s.charAt(++i);
				int hb = (Character.isDigit((char) ch) ? ch - '0'
						: 10 + Character.toLowerCase((char) ch) - 'a') & 0xF;
				ch = s.charAt(++i);
				int lb = (Character.isDigit((char) ch) ? ch - '0'
						: 10 + Character.toLowerCase((char) ch) - 'a') & 0xF;
				b = (hb << 4) | lb;
				break;
			case '+':
				b = ' ';
				break;
			default:
				b = ch;
			}
			/* Decode byte b as UTF-8, sumb collects incomplete chars */
			if ((b & 0xc0) == 0x80) { // 10xxxxxx (continuation byte)
				sumb = (sumb << 6) | (b & 0x3f); // Add 6 bits to sumb
				if (--more == 0)
					sbuf.append((char) sumb); // Add char to sbuf
			} else if ((b & 0x80) == 0x00) { // 0xxxxxxx (yields 7 bits)
				sbuf.append((char) b); // Store in sbuf
			} else if ((b & 0xe0) == 0xc0) { // 110xxxxx (yields 5 bits)
				sumb = b & 0x1f;
				more = 1; // Expect 1 more byte
			} else if ((b & 0xf0) == 0xe0) { // 1110xxxx (yields 4 bits)
				sumb = b & 0x0f;
				more = 2; // Expect 2 more bytes
			} else if ((b & 0xf8) == 0xf0) { // 11110xxx (yields 3 bits)
				sumb = b & 0x07;
				more = 3; // Expect 3 more bytes
			} else if ((b & 0xfc) == 0xf8) { // 111110xx (yields 2 bits)
				sumb = b & 0x03;
				more = 4; // Expect 4 more bytes
			} else /* if ((b & 0xfe) == 0xfc) */{ // 1111110x (yields 1 bit)
				sumb = b & 0x01;
				more = 5; // Expect 5 more bytes
			}
			/* We don't test if the UTF-8 encoding is well-formed */
		}
		return sbuf.toString();
	}

	public String toURL(String str) {
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < str.length(); i++) {
			char c = str.charAt(i);
			if (c >= 0 && c <= 255) {
				sb.append(c);
			} else {
				byte[] b;
				try {
					b = String.valueOf(c).getBytes("utf-8");
				} catch (Exception ex) {
					System.out.println(ex);
					b = new byte[0];
				}
				for (int j = 0; j < b.length; j++) {
					int k = b[j];
					if (k < 0)
						k += 256;
					sb.append("%" + Integer.toHexString(k).toUpperCase());
				}
			}
		}
		return sb.toString();
	}

	
}