首先，贴上Base64工具类【网上也有专门的base64第三方封装类库jar。我做过测试，在java环境下可用；可是当我在android项目中调用jar包工具类时，程序显示找不到指定方法的异常，问题在于android里面对第三方jar包不兼容，所以最后放弃调用外部jar包的方式，转而调用自己的工具类】
以下是base64可用工具类：
Base64Util
package com.sohan.util; import java.io.UnsupportedEncodingException; public class Base64Util { private static char[] base64EncodeChars = new char[] { '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', '+', '/' }; private static byte[] base64DecodeChars = new byte[] { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 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, -1, -1, -1, -1, -1, -1, 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, -1, -1, -1, -1, -1 }; public static String encode(byte[] data) { StringBuffer sb = new StringBuffer(); int len = data.length; int i = 0; int b1, b2, b3; while (i < len) { b1 = data[i++] & 0xff; if (i == len) { sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[(b1 & 0x3) << 4]); sb.append("=="); break; } b2 = data[i++] & 0xff; if (i == len) { sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]); sb.append(base64EncodeChars[(b2 & 0x0f) << 2]); sb.append("="); break; } b3 = data[i++] & 0xff; sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]); sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]); sb.append(base64EncodeChars[b3 & 0x3f]); } return sb.toString(); } public static byte[] decode(String str) throws UnsupportedEncodingException { StringBuffer sb = new StringBuffer(); byte[] data = str.getBytes("US-ASCII"); int len = data.length; int i = 0; int b1, b2, b3, b4; while (i < len) { do { b1 = base64DecodeChars[data[i++]]; } while (i < len && b1 == -1); if (b1 == -1) break; do { b2 = base64DecodeChars[data[i++]]; } while (i < len && b2 == -1); if (b2 == -1) break; sb.append((char) ((b1 << 2) | ((b2 & 0x30) >>> 4))); do { b3 = data[i++]; if (b3 == 61) return sb.toString().getBytes("iso8859-1"); b3 = base64DecodeChars[b3]; } while (i < len && b3 == -1); if (b3 == -1) break; sb.append((char) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2))); do { b4 = data[i++]; if (b4 == 61) return sb.toString().getBytes("iso8859-1"); b4 = base64DecodeChars[b4]; } while (i < len && b4 == -1); if (b4 == -1) break; sb.append((char) (((b3 & 0x03) << 6) | b4)); } return sb.toString().getBytes("iso8859-1"); } /** * @param args * @throws UnsupportedEncodingException */ public static void main(String[] args) throws UnsupportedEncodingException { // 自定义类库加密解密 Base64Util bs = new Base64Util(); String s = "110Action=APITest&"; System.out.println("加密前：" + s); String x = bs.encode(s.getBytes()); System.out.println("加密后：" + x); String x1 = new String(bs.decode(x)); System.out.println("解密后：" + x1); //before:110Action=APITest& //base64:MTEwQWN0aW9uPUFQSVRlc3Qm //return:u7bTrcq508PLtrq6QVBJ } }
然后，socket客户端代码如下：
SocketFactory
public String BaseSocket(Context con, String sendstr) { PrintWriter outw = null; DataInputStream dataIn = null; Socket s = null; String servername ="127.0.0.1"; String port = 55555; String readData = ""; try { Log.d("log", "......BaseSocket Starting....."); s = new Socket(); // 实例化socket SocketAddress socketAddress = new InetSocketAddress(servername, port); // 获取sockaddress对象 s.connect(socketAddress, 8000); // 连接socket并设置连接超时为8秒，如果8秒后服务端还没有响应，则弹出异常信息。 outw = new PrintWriter(new BufferedWriter(new OutputStreamWriter( s.getOutputStream(), "GBK")), true); String base64str = Base64Util.encode(sendstr.getBytes("gb2312"));//加密socket发送字段，注意编码的统一，防止中文乱码的出现 base64str = base64str.replaceAll("\\r\\n", "");//注意转义字符的使用 Log.d("log","send_before:" + sendstr); Log.d("log","send_encode:" + base64str); outw.println(base64str); Log.d("log", "服务器:" + s.getRemoteSocketAddress()); dataIn = new DataInputStream(s.getInputStream()); byte[] readByte = new byte[1024]; int i = 0; while ((i = dataIn.read(readByte)) != -1) { readData += new String(readByte, 0, i, "gbk"); if (readData.contains("\r") || readData.contains("\n"))//约定服务端发送的base64字段以换行符作为结束字符 break; } Log.d("log","return:" + readData); sockResultStr = new String(Base64Util.decode(readData), "gb2312");//解密socket返回base64字段,同样注意编码问题 Log.d("log","redecode:" + sockResultStr); } catch (Exception e) {// 捕获异常 sockResultStr = "fail"; e.printStackTrace(); Log.d("log", "连接服务器失败"); } finally { try { if (dataIn != null) { dataIn.close(); dataIn = null; } } catch (Exception e) { e.printStackTrace(); } try { if (outw != null) { outw.close(); outw = null; } } catch (Exception e) { e.printStackTrace(); } try { if (s != null) { s.close(); s = null; Log.d("log", "......baseSocket finished....."); } } catch (Exception e) { e.printStackTrace(); } return sockResultStr; } }