Asciiとnative間の変換

package com.test;

public class AsciiToString {
	public static void main(String argv[]) {
		AsciiToString tt = new AsciiToString();
		String str1 = tt.native2ascii(" ， 。");
		System.out.println("native2ascii:"+str1);
		String str2 = tt.ascii2native(str1);
		System.out.println("ascii2native:"+str2);
	}

	public String native2ascii(String str) {
		char ac[] = str.toCharArray();
		int len = ac.length;
		StringBuffer out = new StringBuffer();
		for (int i = 0; i < len; i++)
			if (ac[i] > '\177') {
				out.append(new char[] { 92, 117 });
				String s1 = Integer.toHexString(ac[i]);
				StringBuffer stringbuffer = new StringBuffer(s1);
				stringbuffer.reverse();
				int l = 4 - stringbuffer.length();
				for (int i1 = 0; i1 < l; i1++)
					stringbuffer.append('0');
				for (int j1 = 0; j1 < 4; j1++)
					out.append(stringbuffer.charAt(3 - j1));
			} else {
				out.append(ac[i]);
			}
		return out.toString();
	}

	public String ascii2native(String str) {
		char[] ac1 = str.toCharArray();
		int k = ac1.length;
		StringBuffer sb = new StringBuffer();
		int k1 = 0;
		do {
			if (k1 >= k)
				break;
			char c = ac1[k1++];
			if (c != '\\' || k - k1 < 5) {
				sb.append(c);
				continue;
			}
			c = ac1[k1++];
			if (c != 'u') {
				sb.append('\\');
				sb.append(c);
			} else {
				char c1 = '\0';
				boolean flag2 = true;
				try {
					c1 = (char) Integer.parseInt(new String(ac1, k1, 4), 16);
				} catch (NumberFormatException numberformatexception) {
					flag2 = false;
				}
				if (flag2) {
					sb.append(c1);
					k1 += 4;
				} else {
					sb.append('\\');
					sb.append(c);
				}
			}
		} while (true);
		return sb.toString();
	}
}