Java URI Encode encodeURIString(Writer out, String text, String encoding, int start)

Description

encode URI String

License

CDDL license

Declaration

static private void encodeURIString(Writer out, String text, String encoding, int start)
            throws IOException, UnsupportedEncodingException 

Method Source Code

//package com.java2s;
/*//from  w  w w .j a v a2 s .  c om
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the License). You may not use this file except in
 * compliance with the License.
 * 
 * You can obtain a copy of the License at
 * https://javaserverfaces.dev.java.net/CDDL.html or
 * legal/CDDLv1.0.txt. 
 * See the License for the specific language governing
 * permission and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL
 * Header Notice in each file and include the License file
 * at legal/CDDLv1.0.txt.    
 * If applicable, add the following below the CDDL Header,
 * with the fields enclosed by brackets [] replaced by
 * your own identifying information:
 * "Portions Copyrighted [year] [name of copyright owner]"
 * 
 * [Name of File] [ver.__] [Date]
 * 
 * Copyright 2006 Sun Microsystems Inc. All Rights Reserved
 */

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.util.BitSet;

public class Main {
    static private final int MAX_BYTES_PER_CHAR = 10;
    static private final BitSet DONT_ENCODE_SET = new BitSet(256);

    static private void encodeURIString(Writer out, String text, String encoding, int start)
            throws IOException, UnsupportedEncodingException {
        ByteArrayOutputStream buf = null;
        OutputStreamWriter writer = null;
        char[] charArray = null;

        int length = text.length();
        for (int i = start; i < length; i++) {
            char ch = text.charAt(i);
            if (DONT_ENCODE_SET.get(ch)) {
                out.write(ch);
            } else {
                if (buf == null) {
                    buf = new ByteArrayOutputStream(MAX_BYTES_PER_CHAR);
                    if (encoding != null) {
                        writer = new OutputStreamWriter(buf, encoding);
                    } else {
                        writer = new OutputStreamWriter(buf);
                    }
                    charArray = new char[1];
                }

                // convert to external encoding before hex conversion
                try {
                    // An inspection of OutputStreamWriter reveals
                    // that write(char) always allocates a one element
                    // character array.  We can reuse our own.
                    charArray[0] = ch;
                    writer.write(charArray, 0, 1);
                    writer.flush();
                } catch (IOException e) {
                    buf.reset();
                    continue;
                }

                byte[] ba = buf.toByteArray();
                for (int j = 0; j < ba.length; j++) {
                    writeURIDoubleHex(out, ba[j] + 256);
                }

                buf.reset();
            }
        }
    }

    static private void writeURIDoubleHex(Writer out, int i) throws IOException {
        out.write('%');
        out.write(intToHex((i >> 4) % 0x10));
        out.write(intToHex(i % 0x10));
    }

    static private char intToHex(int i) {
        if (i < 10)
            return ((char) ('0' + i));
        else
            return ((char) ('A' + (i - 10)));
    }
}

Related

1. encodeURIComponent(String s, String charset)
2. encodeURIComponent(String uriComp)
3. encodeUriComponent(String value)
4. encodeURIComponentForJavaScript(String str)
5. encodeURIParam(String s)
6. encodeUriWithPrefix(String uri)
7. uriEncode(Object o)
8. uriEncode(String decoded)
9. uriEncode(String input)