Base64 浣跨敤US-ASCII瀛愰泦鐨?4涓瓧絎?鍗沖ぇ灝忓啓鐨?6涓嫳鏂囧瓧姣嶏紝0錛?錛岋紜錛?銆?br>緙栫爜鎬繪槸鍩轟簬3涓瓧絎︼紝姣忎釜瀛楃鐢?浣嶄簩榪涘埗琛ㄧず錛屽洜姝や竴鍏?4浣嶏紝鍐嶅垎涓?鍥涚粍錛屾瘡緇?浣嶏紝琛ㄧず涓涓狟ase64鐨勫箋傚涓嬶細
"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", "+", "/"
Base64鍊間負0灝辨槸A錛屼負27鐨勫氨鏄痓銆傝繖鏍鳳紝姣?涓瓧絎︿駭鐢?浣嶇殑Base64瀛楃銆傚鏋滆鍔犲瘑鐨勫瓧絎︿覆姣?涓竴緇勶紝榪樺墿1鎴?涓瓧絎︼紝浣跨敤鐗規畩瀛楃"="琛ラ綈Base64鐨?瀛椼?br>
濡傦紝緙栫爜鍙湁2涓瓧絎?#8220;me”錛宮鐨刟scii鏄?09錛宔鐨勬槸101錛岀敤浜岃繘鍒惰〃紺哄垎鍒槸01101101銆?1100101錛岃繛鎺ヨ搗鏉ュ氨鏄?110110101100101錛屽啀鎸?浣嶅垎涓轟竴緇勶細011011銆?10110銆?10100錛堜笉瓚?浣嶈ˉ0錛夛紝鍒嗗埆ascii鍒嗗埆鏄?7銆?2銆?0錛屽嵆Base64鍊間負bWU錛孊ase64涓嶈凍4瀛楋紝鐢紳琛ラ綈錛屽洜姝WU錛濆氨me鐨凚ase64鍊箋?br>
鐢╦ava鐨勬寜浣嶉昏緫鍜岀Щ浣嶈繍綆楀氨鍙互瀹炵幇璇ョ畻娉曘備絾瀹為檯涓婏紝騫朵笉鐢ㄦ垜浠嚜宸卞幓緙栫▼瀹炵幇銆傜幇鏈夊疄鐜拌鍔犲瘑瑙ｅ瘑綆楁硶鐨勭▼搴忓緢澶氾紝濡俲avamail鐨凪imeUtility銆?br>
瀹炶返錛歫avamail鐨凪imeUtility瀹炵幇瀵瑰瓧絎︿覆鐨勫姞瀵嗚В瀵?/font>
絎竴姝ワ紝鍦╡clipse鏂板緩涓涓猨ava欏圭洰錛屽茍寮曡繘javamail.jar
絎簩姝ワ紝鍦╟om.mascot.encrypt鍖呬笅鍒涘緩嫻嬭瘯鍗曞厓錛屾敞鎰忓紩榪沯avax.mail.internet.MimeUtility
package com.mascot.encrypt;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStreamReader;
import javax.mail.internet.MimeUtility;
public class Base64 {
public static BufferedReader decode(String b64string) throws Exception {
return new BufferedReader(
new InputStreamReader(
MimeUtility.decode(
new ByteArrayInputStream(
b64string.getBytes()), "base64")));
}
public static void main(String args[]) throws Exception{
System.out.println(encodeAsString("hello"));
System.out.println(decodeAsString("aGVsbG8="));
System.out.println(decodeAsString("aGVsbG8A"));
}
public static String decodeAsString(String b64string) throws Exception {
if (b64string == null) {
return b64string;
}
String returnString = decode(b64string).readLine();
if (returnString == null) {
return returnString;
}
return returnString.trim();
}
public static ByteArrayOutputStream encode(String plaintext)
throws Exception {
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] in = plaintext.getBytes();
ByteArrayOutputStream inStream = new ByteArrayOutputStream();
inStream.write(in, 0, in.length);
//琛?
if ((in.length % 3 ) == 1){
inStream.write(0);
inStream.write(0);
} else if((in.length % 3 ) == 2){
inStream.write(0);
}
inStream.writeTo( MimeUtility.encode(out, "base64") );
return out;
}
public static String encodeAsString(String plaintext) throws Exception {
return encode(plaintext).toString();
}
}
絎笁姝ワ紝榪愯紼嬪簭錛岀粨鏋滐細
aGVsbG8A
hello
hello
娉ㄦ剰鍒癶ello鐨勫姞瀵嗙粨鏋滃茍涓嶆槸aGVsbG8錛濓紝鑰屾槸aGVsbG8A錛岃繖鏄洜涓虹▼搴忚ˉ榻愰兘鏄ˉ0錛岃?瀵瑰簲鐨凚ase64鍊煎氨鏄疉錛岃繖鏄垜浠▼搴忓疄鐜頒笌涓婅堪鐞嗚涓嶅悓閫犳垚鐨勩?/span>
]]>