import java.io.*;
import java.net.*;
/*
* @(#)URLEncoder.java 1.18 00/02/02
*
* Copyright 1995-2000 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the proprietary information of Sun Microsystems, Inc.
* Use is subject to license terms.
*
*/
//package java.net;
import java.io.ByteArrayOutputStream;
import java.io.OutputStreamWriter;
import java.io.IOException;
import java.util.BitSet;
/**
* The class contains a utility method for converting a
* <code>String</code> into a MIME format called
* "<code>x-www-form-urlencoded</code>" format.
* <p>
* To convert a <code>String</code>, each character is examined in turn:
* <ul>
* <li>The ASCII characters '<code>a</code>' through '<code>z</code>',
* '<code>A</code>' through '<code>Z</code>', '<code>0</code>'
* through '<code>9</code>', and ".", "-",
* "*", "_" remain the same.
* <li>The space character '<code> </code>' is converted into a
* plus sign '<code>+</code>'.
* <li>All other characters are converted into the 3-character string
* "<code>%<i>xy</i></code>", where <i>xy</i> is the two-digit
* hexadecimal representation of the lower 8-bits of the character.
* </ul>
*
* @author Herb Jellinek
* @version 1.18, 02/02/00
* @since JDK1.0
*/
public class URLEncoder2 {
static BitSet dontNeedEncoding;
static final int caseDiff = ('a' - 'A');
/* The list of characters that are not encoded have been determined by
referencing O'Reilly's "HTML: The Definitive Guide" (page 164). */
static {
dontNeedEncoding = new BitSet(256);
int i;
for (i = 'a'; i <= 'z'; i++) {
dontNeedEncoding.set(i);
}
for (i = 'A'; i <= 'Z'; i++) {
dontNeedEncoding.set(i);
}
for (i = '0'; i <= '9'; i++) {
dontNeedEncoding.set(i);
}
dontNeedEncoding.set(' '); /* encoding a space to a + is done in the encode() method */
dontNeedEncoding.set('-');
dontNeedEncoding.set('_');
dontNeedEncoding.set('.');
dontNeedEncoding.set('*');
}
/**
* You can't call the constructor.
*/
private URLEncoder2() { }
/**
* Translates a string into <code>x-www-form-urlencoded</code> format.
*
* @param s <code>String</code> to be translated.
* @return the translated <code>String</code>.
*/
public static String encode(String s, String enc) throws Exception {
int maxBytesPerChar = 10;
StringBuffer out = new StringBuffer(s.length());
ByteArrayOutputStream buf = new ByteArrayOutputStream(maxBytesPerChar);
/* Del sha '01.05.10
OutputStreamWriter writer = new OutputStreamWriter(buf);
...Del sha '01.05.10 */
// Add sha '01.05.10
OutputStreamWriter writer = new OutputStreamWriter(buf, enc);
// ...Add sha '01.05.10
for (int i = 0; i < s.length(); i++) {
int c = (int)s.charAt(i);
if (dontNeedEncoding.get(c)) {
if (c == ' ') {
c = '+';
}
out.append((char)c);
} else {
// convert to external encoding before hex conversion
try {
writer.write(c);
writer.flush();
} catch(IOException e) {
buf.reset();
continue;
}
byte[] ba = buf.toByteArray();
for (int j = 0; j < ba.length; j++) {
out.append('%');
char ch = Character.forDigit((ba[j] >> 4) & 0xF, 16);
// converting to use uppercase letter as part of
// the hex value if ch is a letter.
if (Character.isLetter(ch)) {
ch -= caseDiff;
}
out.append(ch);
ch = Character.forDigit(ba[j] & 0xF, 16);
if (Character.isLetter(ch)) {
ch -= caseDiff;
}
out.append(ch);
}
buf.reset();
}
}
return out.toString();
}
// デバッグ用
public static void main(String[] args) {
// String src = "草津";
String str = "横浜";
debugEncodeAndDecode(str, "UTF-8");
debugEncodeAndDecode(str, "UTF-16");
debugEncodeAndDecode(str, "EUC-JP");
debugEncodeAndDecode(str, "Shift_JIS");
}
public static void debugEncodeAndDecode(String str, String enc) {
PrintWriter out = new PrintWriter(System.out);
try {
String src = str;
String dst;
out.println("--- URLEncoder2.encode(\"" + src + "\", \"" + enc + "\"); ---");
out.println("変換前 : " + src);
dst = URLEncoder2.encode(src, enc);
out.println("変換後 : " + dst);
src = URLDecoder2.decode(dst, enc);
out.println("再変換 : " + src);
out.println("");
}
catch (Exception e) {
out.println("例外が発生しました！！");
}
out.flush();
}
}
