URLEncodingUtil.java
package com.foxinmy.weixin4j.util;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.BitSet;
/**
*
* @className URLEncodingUtil
* @author jinyu(foxinmy@gmail.com)
* @date 2015年8月15日
* @since JDK 1.6
* @see
*/
public final class URLEncodingUtil {
/**
* Unreserved characters, i.e. alphanumeric, plus: {@code _ - ! . ~ ' ( ) *}
* <p>
* This list is the same as the {@code unreserved} list in <a
* href="http://www.ietf.org/rfc/rfc2396.txt">RFC 2396</a>
*/
private static final BitSet UNRESERVED = new BitSet(256);
/**
* Punctuation characters: , ; : $ & + =
* <p>
* These are the additional characters allowed by userinfo.
*/
private static final BitSet PUNCT = new BitSet(256);
/**
* Characters which are safe to use in userinfo, i.e. {@link #UNRESERVED}
* plus {@link #PUNCT}uation
*/
private static final BitSet USERINFO = new BitSet(256);
/**
* Characters which are safe to use in a path, i.e. {@link #UNRESERVED} plus
* {@link #PUNCT}uation plus / @
*/
private static final BitSet PATHSAFE = new BitSet(256);
/**
* Characters which are safe to use in a fragment, i.e. {@link #RESERVED}
* plus {@link #UNRESERVED}
*/
private static final BitSet FRAGMENT = new BitSet(256);
/**
* Reserved characters, i.e. {@code ;/?:@&=+$,[]}
* <p>
* This list is the same as the {@code reserved} list in <a
* href="http://www.ietf.org/rfc/rfc2396.txt">RFC 2396</a> as augmented by
* <a href="http://www.ietf.org/rfc/rfc2732.txt">RFC 2732</a>
*/
private static final BitSet RESERVED = new BitSet(256);
/**
* Safe characters for x-www-form-urlencoded data, as per
* java.net.URLEncoder and browser behaviour, i.e. alphanumeric plus
* {@code "-", "_", ".", "*"}
*/
private static final BitSet URLENCODER = new BitSet(256);
static {
// unreserved chars
// alpha characters
for (int i = 'a'; i <= 'z'; i++) {
UNRESERVED.set(i);
}
for (int i = 'A'; i <= 'Z'; i++) {
UNRESERVED.set(i);
}
// numeric characters
for (int i = '0'; i <= '9'; i++) {
UNRESERVED.set(i);
}
UNRESERVED.set('_'); // these are the charactes of the "mark" list
UNRESERVED.set('-');
UNRESERVED.set('.');
UNRESERVED.set('*');
URLENCODER.or(UNRESERVED); // skip remaining unreserved characters
UNRESERVED.set('!');
UNRESERVED.set('~');
UNRESERVED.set('\'');
UNRESERVED.set('(');
UNRESERVED.set(')');
// punct chars
PUNCT.set(',');
PUNCT.set(';');
PUNCT.set(':');
PUNCT.set('$');
PUNCT.set('&');
PUNCT.set('+');
PUNCT.set('=');
// Safe for userinfo
USERINFO.or(UNRESERVED);
USERINFO.or(PUNCT);
// URL path safe
PATHSAFE.or(UNRESERVED);
PATHSAFE.set('/'); // segment separator
PATHSAFE.set(';'); // param separator
PATHSAFE.set(':'); // rest as per list in 2396, i.e. : @ & = + $ ,
PATHSAFE.set('@');
PATHSAFE.set('&');
PATHSAFE.set('=');
PATHSAFE.set('+');
PATHSAFE.set('$');
PATHSAFE.set(',');
RESERVED.set(';');
RESERVED.set('/');
RESERVED.set('?');
RESERVED.set(':');
RESERVED.set('@');
RESERVED.set('&');
RESERVED.set('=');
RESERVED.set('+');
RESERVED.set('$');
RESERVED.set(',');
RESERVED.set('['); // added by RFC 2732
RESERVED.set(']'); // added by RFC 2732
FRAGMENT.or(RESERVED);
FRAGMENT.or(UNRESERVED);
}
private static final int RADIX = 16;
public static String encoding(final String content, final Charset charset,
final boolean blankAsPlus) {
if (content == null) {
return null;
}
StringBuilder buf = new StringBuilder();
ByteBuffer bb = charset.encode(content);
while (bb.hasRemaining()) {
int b = bb.get() & 0xff;
if (URLENCODER.get(b)) {
buf.append((char) b);
} else if (blankAsPlus && b == ' ') {
buf.append('+');
} else {
buf.append("%");
char hex1 = Character.toUpperCase(Character.forDigit(
(b >> 4) & 0xF, RADIX));
char hex2 = Character.toUpperCase(Character.forDigit(b & 0xF,
RADIX));
buf.append(hex1);
buf.append(hex2);
}
}
return buf.toString();
}
}