一个进行base64编码的类。.txt

一个新的采集工具 一个新的采集工具 一个新的采集工具

作者：sonymusic
email: [e-mail]
日期：2001-3-12 15:01:35
package sony.utils;

import java.io.*;
import java.net.*;
public final class Codes {
public final static byte[] base64Encode(byte[] byteData) {
	if (byteData == null)
		return null;
	int iSrcIdx; // index into source (byteData)
	int iDestIdx; // index into destination (byteDest)
	byte byteDest[] = new byte[((byteData.length + 2) / 3) * 4];

	for (iSrcIdx = 0, iDestIdx = 0; iSrcIdx < byteData.length - 2; iSrcIdx += 3) {
		byteDest[iDestIdx++] = (byte) ((byteData[iSrcIdx] >>> 2) & 077);
		byteDest[iDestIdx++] = 
			(byte) ((byteData[iSrcIdx + 1] >>> 4) & 017 | (byteData[iSrcIdx] << 4) & 077); 
		byteDest[iDestIdx++] = 
			(byte) ((byteData[iSrcIdx + 2] >>> 6)
				& 003
				| (byteData[iSrcIdx + 1] << 2)
				& 077); 
		byteDest[iDestIdx++] = (byte) (byteData[iSrcIdx + 2] & 077);
	}

	if (iSrcIdx < byteData.length) {
		byteDest[iDestIdx++] = (byte) ((byteData[iSrcIdx] >>> 2) & 077);
		if (iSrcIdx < byteData.length - 1) {
			byteDest[iDestIdx++] = 
				(byte) ((byteData[iSrcIdx + 1] >>> 4) & 017 | (byteData[iSrcIdx] << 4) & 077); 
			byteDest[iDestIdx++] = (byte) ((byteData[iSrcIdx + 1] << 2) & 077);
		} else
			byteDest[iDestIdx++] = (byte) ((byteData[iSrcIdx] << 4) & 077);
	}

	for (iSrcIdx = 0; iSrcIdx < iDestIdx; iSrcIdx++) {
		if (byteDest[iSrcIdx] < 26)
			byteDest[iSrcIdx] = (byte) (byteDest[iSrcIdx] + 'A');
		else
			if (byteDest[iSrcIdx] < 52)
				byteDest[iSrcIdx] = (byte) (byteDest[iSrcIdx] + 'a' - 26);
			else
				if (byteDest[iSrcIdx] < 62)
					byteDest[iSrcIdx] = (byte) (byteDest[iSrcIdx] + '0' - 52);
				else
					if (byteDest[iSrcIdx] < 63)
						byteDest[iSrcIdx] = (byte) '+';
					else
						byteDest[iSrcIdx] = (byte) '/';
	}

	for (; iSrcIdx < byteDest.length; iSrcIdx++)
		byteDest[iSrcIdx] = (byte) '=';

	return byteDest;
}
public final static String base64Encode(String strInput) {
	if (strInput == null)
		return null;
	return base64Encode(strInput,"GB2312");
}
public final static String base64Encode(String strInput,String charSet) {
	if (strInput == null)
		return null;
	String strOutput=null;
	byte byteData[] = new byte[strInput.length()];
	try {
		//strInput.getBytes(0, strInput.length(), byteData, 0);
		byteData = strInput.getBytes(charSet);
		strOutput=new String(base64Encode(byteData),charSet);
		//strOutput=new String(base64Encode(byteData),0);
	} catch (UnsupportedEncodingException e) {
		return null;
	}
	return strOutput;
}
/**
 * 此处插入方法说明。
 * 创建日期：(2000-11-4 18:27:35)
 * @param steam java.io.InputStream
 * @param charSet java.lang.String
 */
public final static String base64Encode(InputStream in, String charSet) {
	try {
		int c;
		byte[] buff = new byte[1024];
		ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
		while ((c = in.read(buff, 0, 1024)) != -1) {
			out.write(buff, 0, c);
			//index+=1024;
			//out.write(c);
			//attachContent+=ss;
		}
		in.close();
		out.flush();
		byte[] tmp2 = Codes.base64Encode(out.toByteArray());
		out.close();
		return new String(tmp2,charSet);
	}
	catch (IOException e) {
		return "";
	}
}/**
 * 此处插入方法说明。
 * 创建日期：(2000-11-3 23:31:04)
 * @return java.lang.String
 * @param strIn java.lang.String
 */  
public final static String chunkSplit(String strIn) {
	return chunkSplit(strIn,76);
}/**
 * 此处插入方法说明。
 * 创建日期：(2000-11-3 23:31:04)
 * @return java.lang.String
 * @param strIn java.lang.String
 */  
public final static String chunkSplit(String strIn,int splitLen) {
	int index=0;
	String strOut="";
	while(index+splitLen<strIn.length()){
		strOut+=strIn.substring(index,index+splitLen)+"\n";
		index+=splitLen;
	}
	if(index<strIn.length()){
		strOut+=strIn.substring(index);
	}
	return strOut;
}
}