Java ME平台中的URLEncoder实现类(一)

    这个类是从java.net.URLEncoder修改来的  经测试能够正常完成URL编码的工作，在几部手机上测试过。使用的时候直接调用URLEncoder.encode("中国")即可  如果向服务器端发送。可以使用如下的办法对中文进行编码，然后发送向服务器。

String data = "para="+URLEncoder.encode("参数");

outputStream.write(data.getBytes());

.......

在服务器端 以servlet为例 request.getParameter("para")即可获得“参数”

package com.j2medev.httpme.tools;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
/**
 * Utility class for  form encoding.this class is modified form java.net.URLEncoder so that it can work well in cldc env.
 * This class contains static methods
 * for converting a String to the <CODE>application/x-www-form-urlencoded</CODE> MIME
 * format. For more information about HTML form encoding, consult the HTML
 * <A HREF="http://www.w3.org/TR/html4/">specification</A>.
 *
 * <p>
 * When encoding a String, the following rules apply:
 *
 * <p>
 * <ul>
 * <li>The alphanumeric characters "<code>a</code>" through
 *     "<code>z</code>", "<code>A</code>" through
 *     "<code>Z</code>" and "<code>0</code>"
 *     through "<code>9</code>" remain the same.
 * <li>The special characters "<code>.</code>",
 *     "<code>-</code>", "<code>*</code>", and
 *     "<code>_</code>" remain the same.
 * <li>The space character "<code> </code>" is
 *     converted into a plus sign "<code>+</code>".
 * <li>All other characters are unsafe and are first converted into
 *     one or more bytes using some encoding scheme. Then each byte is
 *     represented by the 3-character string
 *     "<code>%<i>xy</i></code>", where <i>xy</i> is the
 *     two-digit hexadecimal representation of the byte.
 *     The recommended encoding scheme to use is UTF-8. However,
 *     for compatibility reasons, if an encoding is not specified,
 *     then the default encoding of the platform is used.
 * </ul>
 *
 * <p>
 * For example using UTF-8 as the encoding scheme the string "The
 * string ü@foo-bar" would get converted to
 * "The+string+%C3%BC%40foo-bar" because in UTF-8 the character
 * ü is encoded as two bytes C3 (hex) and BC (hex), and the
 * character @ is encoded as one byte 40 (hex).
 *
 * @author  mingjava
 * @version 0.1 05/06/2006
 * @since   httpme 0.1
 */
public class URLEncoder {
   
    /** The characters which do not need to be encoded. */
    private static boolean[] dontNeedEncoding;
    private static String defaultEncName = "";
    static final int caseDiff = ('a' - 'A');
    static {
        dontNeedEncoding = new boolean[256];
        int i;
        for (i = 'a'; i <= 'z'; i++) {
            dontNeedEncoding[i] = true;
        }
        for (i = 'A'; i <= 'Z'; i++) {
            dontNeedEncoding[i] = true;
        }
        for (i = '0'; i <= '9'; i++) {
            dontNeedEncoding[i] = true;
        }
        dontNeedEncoding[' '] = true; // encoding a space to a + is done in the encode() method
        dontNeedEncoding['-'] = true;
        dontNeedEncoding['_'] = true;
        dontNeedEncoding['.'] = true;
        dontNeedEncoding['*'] = true;
        defaultEncName = System.getProperty("microedition.encoding");
        if(defaultEncName == null || defaultEncName.trim().length() == 0){
            defaultEncName = "UTF-8";
        }
    }
   
    public static final int MIN_RADIX = 2;
   
    /**
     * The maximum radix available for conversion to and from strings.
     */
    public static final int MAX_RADIX = 36;
    /**
     * The class is not meant to be instantiated.
     */
    private URLEncoder() { }
   
 

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