base64code.java

来自「短信开发用于文件交换处理转发的类模块」· Java 代码 · 共 151 行

package com.pub.util;

/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2006</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
import java.io.*;

public final class Base64Code {
    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 = Base64Code.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;
   }
}