用于MIDP的URLEncoder类

王朝other·作者佚名  2006-11-24
窄屏简体版  字體: |||超大  

由于MIDP没有J2SE对应的java.net.URLEncoder类,因此,要向服务器发送HTTP请求,必须自己进行URL编码,参考JDK1.4.2的src代码,将其改为一个能用在MIDP环境中的URLEncoder类:

// URLEncoder.java

package com.mboker.blog.midp.http;

import java.io.*;

/**

* Encode url, just like java.net.URLEncoder.encode() in J2SE.<br>

* NOTE: This class is modified from java.net.URLEncoder class in J2SE 1.4.

*

* @author Xuefeng

*/

class URLEncoder {

private static final int MAX_BYTES_PER_CHAR = 10; // rather arbitrary limit, but safe for now

private static boolean[] dontNeedEncoding;

private static final int caseDiff = ('a' - 'A');

static {

dontNeedEncoding = new boolean[256];

for (int i='a'; i<='z'; i++) {

dontNeedEncoding[i] = true;

}

for (int i='A'; i<='Z'; i++) {

dontNeedEncoding[i] = true;

}

for (int i='0'; i<='9'; i++) {

dontNeedEncoding[i] = true;

}

dontNeedEncoding[' '] = true;

dontNeedEncoding['-'] = true;

dontNeedEncoding['_'] = true;

dontNeedEncoding['.'] = true;

dontNeedEncoding['*'] = true;

}

private URLEncoder() {}

public static String encode(String s) {

boolean wroteUnencodedChar = false;

StringBuffer out = new StringBuffer(s.length());

ByteArrayOutputStream buf = new ByteArrayOutputStream(MAX_BYTES_PER_CHAR);

OutputStreamWriter writer = new OutputStreamWriter(buf);

for (int i = 0; i < s.length(); i++) {

int c = (int) s.charAt(i);

if (c<256 && dontNeedEncoding[c]) {

out.append((char) (c==' ' ? '+' : c));

wroteUnencodedChar = true;

} else {

// convert to external encoding before hex conversion

try {

if (wroteUnencodedChar) { // Fix for 4407610

writer = new OutputStreamWriter(buf);

wroteUnencodedChar = false;

}

writer.write(c);

/*

* If this character represents the start of a Unicode

* surrogate pair, then pass in two characters. It's not

* clear what should be done if a bytes reserved in the

* surrogate pairs range occurs outside of a legal surrogate

* pair. For now, just treat it as if it were any other

* character.

*/

if (c >= 0xD800 && c <= 0xDBFF) {

if ((i + 1) < s.length()) {

int d = (int) s.charAt(i + 1);

if (d >= 0xDC00 && d <= 0xDFFF) {

writer.write(d);

i++;

}

}

}

writer.flush();

} catch (IOException e) {

buf.reset();

continue;

}

byte[] ba = buf.toByteArray();

for (int j = 0; j < ba.length; j++) {

out.append('%');

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