代码:
package Encryption;
import sun.misc.BASE64Encoder;
import sun.misc.BASE64Decoder;
public class Encryption {
// 将 s 进行 BASE64 编码
public static String getBASE64(String s) {
if (s == null)
return null;
return (new sun.misc.BASE64Encoder()).encode(s.getBytes());
}
// 将 BASE64 编码的字符串 s 进行解码
public static String getFromBASE64(String s) {
if (s == null)
return null;
BASE64Decoder decoder = new BASE64Decoder();
try {
byte[] b = decoder.decodeBuffer(s);
return new String(b);
} catch (Exception e) {
return null;
}
}
}
改进(转):
public class BASE64Encoder { private static char[] codec_table = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' }; public BASE64Encoder() { } public static String encode(byte[] a) { int totalBits = a.length * 8; int nn = totalBits % 6; int curPos = 0;// process bits StringBuffer toReturn = new StringBuffer(); while (curPos < totalBits) { int bytePos = curPos / 8; switch (curPos % 8) { case 0: toReturn.append(codec_table[(a[bytePos] & 0xfc) >> 2]); break; case 2: toReturn.append(codec_table[(a[bytePos] & 0x3f)]); break; case 4: if (bytePos == a.length - 1) { toReturn .append(codec_table[((a[bytePos] & 0x0f) << 2) & 0x3f]); } else { int pos = (((a[bytePos] & 0x0f) << 2) | ((a[bytePos + 1] & 0xc0) >> 6)) & 0x3f; toReturn.append(codec_table[pos]); } break; case 6: if (bytePos == a.length - 1) { toReturn .append(codec_table[((a[bytePos] & 0x03) << 4) & 0x3f]); } else { int pos = (((a[bytePos] & 0x03) << 4) | ((a[bytePos + 1] & 0xf0) >> 4)) & 0x3f; toReturn.append(codec_table[pos]); } break; default: //never hanppen break; } curPos+=6; } if(nn==2) { toReturn.append("=="); } else if(nn==4) { toReturn.append("="); } return toReturn.toString(); } }
public static void main(String[] args) throws Exception { BASE64Encoder encoder=new BASE64Encoder(); sun.misc.BASE64Encoder sunEncoder=new sun.misc.BASE64Encoder(); byte[] testBytes=new byte[1024*1024*2]; long start=System.currentTimeMillis(); for(int i=0;i<10;i++) { sunEncoder.encode(testBytes); } System.out.println("[sun encoder]use time :"+(System.currentTimeMillis()-start)); start=System.currentTimeMillis(); for(int i=0;i<10;i++) { encoder.encode(testBytes); } System.out.println("[our encoder]use time :"+(System.currentTimeMillis()-start)); }