class="java"> import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.Random; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; public class Base64 { private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray(); static BASE64Decoder decoder = new BASE64Decoder(); static BASE64Encoder encoder = new BASE64Encoder(); public static String encode(byte[] data) { int start = 0; int len = data.length; StringBuffer buf = new StringBuffer(data.length * 3 / 2); int end = len - 3; int i = start; int n = 0; while (i <= end) { int d = ((((int) data[i]) & 0x0ff) << 16) | ((((int) data[i + 1]) & 0x0ff) << 8) | (((int) data[i + 2]) & 0x0ff); buf.append(legalChars[(d >> 18) & 63]); buf.append(legalChars[(d >> 12) & 63]); buf.append(legalChars[(d >> 6) & 63]); buf.append(legalChars[d & 63]); i += 3; if (n++ >= 14) { n = 0; buf.append(" "); } } if (i == start + len - 2) { int d = ((((int) data[i]) & 0x0ff) << 16) | ((((int) data[i + 1]) & 255) << 8); buf.append(legalChars[(d >> 18) & 63]); buf.append(legalChars[(d >> 12) & 63]); buf.append(legalChars[(d >> 6) & 63]); buf.append("="); } else if (i == start + len - 1) { int d = (((int) data[i]) & 0x0ff) << 16; buf.append(legalChars[(d >> 18) & 63]); buf.append(legalChars[(d >> 12) & 63]); buf.append("=="); } return buf.toString(); } private static int decode(char c) { if (c >= 'A' && c <= 'Z') return ((int) c) - 65; else if (c >= 'a' && c <= 'z') return ((int) c) - 97 + 26; else if (c >= '0' && c <= '9') return ((int) c) - 48 + 26 + 26; else switch (c) { case '+': return 62; case '/': return 63; case '=': return 0; default: throw new RuntimeException("unexpected code: " + c); } } public static byte[] decode(String s) { ByteArrayOutputStream bos = new ByteArrayOutputStream(); try { decode(s, bos); } catch (IOException e) { throw new RuntimeException(); } byte[] decodedBytes = bos.toByteArray(); try { bos.close(); bos = null; } catch (IOException ex) { System.err.println("Error while decoding BASE64: " + ex.toString()); } return decodedBytes; } private static void decode(String s, OutputStream os) throws IOException { int i = 0; int len = s.length(); while (true) { while (i < len && s.charAt(i) <= ' ') i++; if (i == len) break; int tri = (decode(s.charAt(i)) << 18) + (decode(s.charAt(i + 1)) << 12) + (decode(s.charAt(i + 2)) << 6) + (decode(s.charAt(i + 3))); os.write((tri >> 16) & 255); if (s.charAt(i + 2) == '=') break; os.write((tri >> 8) & 255); if (s.charAt(i + 3) == '=') break; os.write(tri & 255); i += 4; } } public static void main(String[] args) throws IOException { for(int i=0;i<20;i++){ test(); System.out.println("--------------------------"); } } public static void test() throws IOException { Random random = new Random(); int length = random.nextInt()%100; length = length<0 ? (-length):length; System.out.println("length:"+length); byte[] a = new byte[length]; random.nextBytes(a); StringBuffer sb = new StringBuffer(); String base64 = encode(a); System.out.println("自定义base:"+base64.replaceAll(" ", "").replaceAll("\n", ""));//不知为什么会混进空格和换行 String aa = encoder.encode(a); System.out.println("官方原base:"+aa.replaceAll(" ", "").replaceAll("\n", ""));//不知为什么会混进空格和换行 sb.delete(0,sb.length()); for(byte b:a){ sb.append((int)b); } System.out.println("明文原base:"+sb.toString()); sb.delete(0,sb.length()); a = decoder.decodeBuffer(aa); for(byte b:a){ sb.append((int)b); } System.out.println("官方原base:"+sb.toString()); sb.delete(0,sb.length()); a = decode(base64); for(byte b:a){ sb.append((int)b); } System.out.println("自定义base:"+sb.toString()); } }