BASE64Encoder竟然编出回车换行了?怎么回事? RFC2045中规定的: The encoded output stream must be represented in lines of no more than 76 characters each 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 送个BASE64实现类给你:public final class Base64{ private static final byte[] DECODE_TABLE=new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,62, 0, 0, 0,63, 52,53,54,55,56,57,58,59,60,61, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14, 15,16,17,18,19,20,21,22,23,24,25, 0, 0, 0, 0, 0, 0,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40, 41,42,43,44,45,46,47,48,49,50,51, 0, 0, 0, 0, 0 }; //"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" private static final byte[] ENCODE_TABLE=new byte[] { 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 97, 98, 99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 43, 47 }; static { //create encode table //ENCODE_TABLE = new byte[64]; int index = 0; for(char c='A'; c<='Z'; c++) ENCODE_TABLE[index++] = (byte) c; for(char c='a'; c<='z'; c++) ENCODE_TABLE[index++] = (byte) c; for(char c='0'; c<='9'; c++) ENCODE_TABLE[index++] = (byte) c; ENCODE_TABLE[index++] = (byte) '+'; ENCODE_TABLE[index++] = (byte) '/'; //create decode table for(int i=0; i<64; i++) DECODE_TABLE[(int) ENCODE_TABLE[i]] = (byte) i; } private Base64(){} public static byte[] encode(byte[] data) { if(data==null) return null; int fullGroups = data.length/3; int resultBytes = fullGroups*4; if(data.length%3 != 0) resultBytes += 4; byte[] result = new byte[resultBytes]; int resultIndex = 0; int dataIndex=0; int temp = 0; for(int i=0; i<fullGroups; i++) { temp = (data[dataIndex++]&0xff)<<16 | (data[dataIndex++]&0xff)<<8 | data[dataIndex++]&0xff; result[resultIndex++] = ENCODE_TABLE[(temp>>18) & 0x3f]; result[resultIndex++] = ENCODE_TABLE[(temp>>12) & 0x3f]; result[resultIndex++] = ENCODE_TABLE[(temp>>6) & 0x3f]; result[resultIndex++] = ENCODE_TABLE[temp&0x3f]; } temp=0; while(dataIndex<data.length) { temp<<=8; temp|=data[dataIndex++]&0xff; } switch(data.length%3) { case 1: temp <<= 8; temp <<= 8; result[resultIndex++] = ENCODE_TABLE[(temp>>18) & 0x3f]; result[resultIndex++] = ENCODE_TABLE[(temp>>12) & 0x3f]; result[resultIndex++] = 0x3D; result[resultIndex++] = 0x3D; break; case 2: temp <<= 8; result[resultIndex++] = ENCODE_TABLE[(temp>>18) & 0x3f]; result[resultIndex++] = ENCODE_TABLE[(temp>>12) & 0x3f]; result[resultIndex++] = ENCODE_TABLE[(temp>>6) & 0x3f]; result[resultIndex++] = 0x3D; break; default: break; } return result; } public static byte[] decode(byte[] base64Data) { if(base64Data==null) return null; if(base64Data.length==0) return new byte[0]; if(base64Data.length%4 !=0) throw new IllegalArgumentException("数据不完整,长度为:"+base64Data.length); byte[] result=null; int groupCount = base64Data.length/4; int lastData = base64Data.length; while(base64Data[lastData-1] == 0x3D) { if(--lastData == 0) return new byte[0]; } result = new byte[lastData-groupCount]; int temp = 0; int resultIndex = 0; int dataIndex = 0; for(; dataIndex+4 < base64Data.length;) { temp = DECODE_TABLE[base64Data[dataIndex++]]; temp = (temp<<6) + DECODE_TABLE[base64Data[dataIndex++]]; temp = (temp<<6) + DECODE_TABLE[base64Data[dataIndex++]]; temp = (temp<<6) + DECODE_TABLE[base64Data[dataIndex++]]; result[resultIndex++] = (byte)((temp>>16) & 0xff); result[resultIndex++] = (byte)((temp>>8) & 0xff); result[resultIndex++] = (byte)(temp & 0xff); } temp = 0; int j = 0; for(; dataIndex<base64Data.length; dataIndex++,j++) temp = (temp<<6) + DECODE_TABLE[base64Data[dataIndex]]; for(; j<4; j++) temp <<= 6; result[resultIndex++] = (byte)((temp>>16) & 0xff); if(base64Data[dataIndex-2] != '=') result[resultIndex++] = (byte)((temp>>8) & 0xff); if(base64Data[dataIndex-1] != '=') result[resultIndex++] = (byte)(temp & 0xff); return result; }}需要注意的是:如果数据量大,比较耗内存 使用java的URLConnection下载网页,得到的网页内容不全的问题? Swing获取JFRAME的位置(移动后的) 3维数据存储与快速定位的讨论,很有用的哦! 高分求助关于线程和进度条的问题,急 一个小问题 如何实现窗口的控件消息响应和自动隐藏? AprLifecycleListener 对编程特感兴趣,但是目前是外行,请教几个问题!!! java 全局 队列 xp下不能安装JBUILDER 吗? [Eclipse]CVS EDITORS 视图如何使用? 哈哈,需要短信网关IP地址及其源代码的快来顶一下。
public final class Base64
{
private static final byte[] DECODE_TABLE=new byte[]
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,62, 0, 0, 0,63,
52,53,54,55,56,57,58,59,60,61, 0, 0, 0, 0, 0, 0,
0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,
15,16,17,18,19,20,21,22,23,24,25, 0, 0, 0, 0, 0,
0,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
41,42,43,44,45,46,47,48,49,50,51, 0, 0, 0, 0, 0
}; //"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
private static final byte[] ENCODE_TABLE=new byte[]
{ 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90,
97, 98, 99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,
48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
43, 47
}; static
{
//create encode table
//ENCODE_TABLE = new byte[64];
int index = 0;
for(char c='A'; c<='Z'; c++)
ENCODE_TABLE[index++] = (byte) c;
for(char c='a'; c<='z'; c++)
ENCODE_TABLE[index++] = (byte) c;
for(char c='0'; c<='9'; c++)
ENCODE_TABLE[index++] = (byte) c;
ENCODE_TABLE[index++] = (byte) '+';
ENCODE_TABLE[index++] = (byte) '/'; //create decode table
for(int i=0; i<64; i++)
DECODE_TABLE[(int) ENCODE_TABLE[i]] = (byte) i;
} private Base64(){} public static byte[] encode(byte[] data)
{
if(data==null)
return null; int fullGroups = data.length/3;
int resultBytes = fullGroups*4;
if(data.length%3 != 0)
resultBytes += 4; byte[] result = new byte[resultBytes];
int resultIndex = 0;
int dataIndex=0;
int temp = 0;
for(int i=0; i<fullGroups; i++)
{
temp = (data[dataIndex++]&0xff)<<16
| (data[dataIndex++]&0xff)<<8
| data[dataIndex++]&0xff; result[resultIndex++] = ENCODE_TABLE[(temp>>18) & 0x3f];
result[resultIndex++] = ENCODE_TABLE[(temp>>12) & 0x3f];
result[resultIndex++] = ENCODE_TABLE[(temp>>6) & 0x3f];
result[resultIndex++] = ENCODE_TABLE[temp&0x3f];
}
temp=0;
while(dataIndex<data.length)
{
temp<<=8;
temp|=data[dataIndex++]&0xff;
}
switch(data.length%3)
{
case 1:
temp <<= 8;
temp <<= 8;
result[resultIndex++] = ENCODE_TABLE[(temp>>18) & 0x3f];
result[resultIndex++] = ENCODE_TABLE[(temp>>12) & 0x3f];
result[resultIndex++] = 0x3D;
result[resultIndex++] = 0x3D;
break;
case 2:
temp <<= 8;
result[resultIndex++] = ENCODE_TABLE[(temp>>18) & 0x3f];
result[resultIndex++] = ENCODE_TABLE[(temp>>12) & 0x3f];
result[resultIndex++] = ENCODE_TABLE[(temp>>6) & 0x3f];
result[resultIndex++] = 0x3D;
break;
default:
break;
} return result;
} public static byte[] decode(byte[] base64Data)
{
if(base64Data==null)
return null;
if(base64Data.length==0)
return new byte[0];
if(base64Data.length%4 !=0)
throw new IllegalArgumentException("数据不完整,长度为:"+base64Data.length); byte[] result=null;
int groupCount = base64Data.length/4; int lastData = base64Data.length;
while(base64Data[lastData-1] == 0x3D)
{
if(--lastData == 0)
return new byte[0];
}
result = new byte[lastData-groupCount]; int temp = 0;
int resultIndex = 0;
int dataIndex = 0;
for(; dataIndex+4 < base64Data.length;)
{
temp = DECODE_TABLE[base64Data[dataIndex++]];
temp = (temp<<6) + DECODE_TABLE[base64Data[dataIndex++]];
temp = (temp<<6) + DECODE_TABLE[base64Data[dataIndex++]];
temp = (temp<<6) + DECODE_TABLE[base64Data[dataIndex++]]; result[resultIndex++] = (byte)((temp>>16) & 0xff);
result[resultIndex++] = (byte)((temp>>8) & 0xff);
result[resultIndex++] = (byte)(temp & 0xff);
} temp = 0;
int j = 0;
for(; dataIndex<base64Data.length; dataIndex++,j++)
temp = (temp<<6) + DECODE_TABLE[base64Data[dataIndex]];
for(; j<4; j++)
temp <<= 6; result[resultIndex++] = (byte)((temp>>16) & 0xff);
if(base64Data[dataIndex-2] != '=')
result[resultIndex++] = (byte)((temp>>8) & 0xff);
if(base64Data[dataIndex-1] != '=')
result[resultIndex++] = (byte)(temp & 0xff); return result;
}
}需要注意的是:如果数据量大,比较耗内存