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72 lines
2.2 KiB
Java
72 lines
2.2 KiB
Java
// URLEncoder.java - Provides a method for encoding strings according to
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// application/x-www-form-urlencoded MIME type.
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/* Copyright (C) 1999 Red Hat, Inc.
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.net;
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import java.io.UnsupportedEncodingException;
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/**
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* @author Warren Levy <warrenl@cygnus.com>
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* @date April 22, 1999.
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*/
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/**
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* Written using on-line Java Platform 1.2 API Specification, as well
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* as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998).
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* Status: Believed complete and correct.
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*/
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public class URLEncoder
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{
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// This method, per the JCL, is conservative in that it encodes
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// some "allowable" characters as % triplets.
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public static String encode(String s)
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{
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// Get the bytes in ISO-Latin-1 (i.e. 8859_1) per the JCL.
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// Even though it is the default in most cases, it's specified here
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// just in case System.getProperty("file.encoding") is not "8859_1".
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String result = "";
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try
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{
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byte[] buf = s.getBytes("8859_1");
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int start = 0;
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for (int i = 0; i < buf.length; i++)
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// For efficiency, check the byte in order of most likely
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// possibility so as to minimize the number of comparisons.
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// Hence, exclude all the alphanumeric & allowed special chars first.
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if ((buf[i] >= 'a' && buf[i] <= 'z') ||
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(buf[i] >= 'A' && buf[i] <= 'Z') ||
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(buf[i] >= '0' && buf[i] <= '9') ||
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buf[i] == '-' || buf[i] == '_' || buf[i] == '.' || buf[i] == '*')
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; // This is the most likely case so exclude first for efficiency.
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else if (buf[i] == ' ')
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buf[i] = (byte) '+'; // Replace space char with plus symbol.
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else
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{
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result = result + new String(buf, start, i - start, "8859_1") +
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"%" + Integer.toHexString(((int) buf[i]) & 0xFF);
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start = i + 1;
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}
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// Append remainder of allowable chars from the string, if any.
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if (start < buf.length)
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result = result +
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new String(buf, start, buf.length - start, "8859_1");
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}
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catch (UnsupportedEncodingException ex)
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{
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// This should never happen as "8859_1" is the default encoding.
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return s;
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}
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return result;
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}
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}
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