图片从数据流转换为字符型，方便网络传输 base64转换 【转】

ndroid不能直接利用java里的base64类，需要自己定义编写一个编码类，从而达到可以在网络中传输照片的目的，以下就是构建一个编码类型，便于进行网络传输。

 

 

构建一个base64类：

public class base64 {
 
 private static final byte[] encodingTable = { (byte) 'A', (byte) 'B',
   (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F', (byte) 'G',
   (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L',
   (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P', (byte) 'Q',
   (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U', (byte) 'V',
   (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z', (byte) 'a',
   (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f',
   (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k',
   (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o', (byte) 'p',
   (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u',
   (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z',
   (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4',
   (byte) '5', (byte) '6', (byte) '7', (byte) '8', (byte) '9',
   (byte) '+', (byte) '/' };

 private static final byte[] decodingTable;

 static {
  decodingTable = new byte[128];
  for (int i = 0; i < 128; i++) {
   decodingTable[i] = (byte) -1;
  }
  for (int i = 'A'; i <= 'Z'; i++) {
   decodingTable[i] = (byte) (i - 'A');
  }
  for (int i = 'a'; i <= 'z'; i++) {
   decodingTable[i] = (byte) (i - 'a' + 26);
  }
  for (int i = '0'; i <= '9'; i++) {
   decodingTable[i] = (byte) (i - '0' + 52);
  }
  decodingTable['+'] = 62;
  decodingTable['/'] = 63;
 }

 public static byte[] encode(byte[] data) {
  byte[] bytes;
  int modulus = data.length % 3;
  if (modulus == 0) {
   bytes = new byte[(4 * data.length) / 3];
  } else {
   bytes = new byte[4 * ((data.length / 3) + 1)];
  }
  int dataLength = (data.length - modulus);
  int a1;
  int a2;
  int a3;
  for (int i = 0, j = 0; i < dataLength; i += 3, j += 4) {
   a1 = data[i] & 0xff;
   a2 = data[i + 1] & 0xff;
   a3 = data[i + 2] & 0xff;
   bytes[j] = encodingTable[(a1 >>> 2) & 0x3f];
   bytes[j + 1] = encodingTable[((a1 << 4) | (a2 >>> 4)) & 0x3f];
   bytes[j + 2] = encodingTable[((a2 << 2) | (a3 >>> 6)) & 0x3f];
   bytes[j + 3] = encodingTable[a3 & 0x3f];
  }
  int b1;
  int b2;
  int b3;
  int d1;
  int d2;
  switch (modulus) {
  case 0: /* nothing left to do */
   break;
  case 1:
   d1 = data[data.length - 1] & 0xff;
   b1 = (d1 >>> 2) & 0x3f;
   b2 = (d1 << 4) & 0x3f;
   bytes[bytes.length - 4] = encodingTable[b1];
   bytes[bytes.length - 3] = encodingTable[b2];
   bytes[bytes.length - 2] = (byte) '=';
   bytes[bytes.length - 1] = (byte) '=';
   break;
  case 2:
   d1 = data[data.length - 2] & 0xff;
   d2 = data[data.length - 1] & 0xff;
   b1 = (d1 >>> 2) & 0x3f;
   b2 = ((d1 << 4) | (d2 >>> 4)) & 0x3f;
   b3 = (d2 << 2) & 0x3f;
   bytes[bytes.length - 4] = encodingTable[b1];
   bytes[bytes.length - 3] = encodingTable[b2];
   bytes[bytes.length - 2] = encodingTable[b3];
   bytes[bytes.length - 1] = (byte) '=';
   break;
  }
  return bytes;
 }

 public static byte[] decode(byte[] data) {
  byte[] bytes;
  byte b1;
  byte b2;
  byte b3;
  byte b4;
  data = discardNonBase64Bytes(data);
  if (data[data.length - 2] == '=') {
   bytes = new byte[(((data.length / 4) - 1) * 3) + 1];
  } else if (data[data.length - 1] == '=') {
   bytes = new byte[(((data.length / 4) - 1) * 3) + 2];
  } else {
   bytes = new byte[((data.length / 4) * 3)];
  }
  for (int i = 0, j = 0; i < (data.length - 4); i += 4, j += 3) {
   b1 = decodingTable[data[i]];
   b2 = decodingTable[data[i + 1]];
   b3 = decodingTable[data[i + 2]];
   b4 = decodingTable[data[i + 3]];
   bytes[j] = (byte) ((b1 << 2) | (b2 >> 4));
   bytes[j + 1] = (byte) ((b2 << 4) | (b3 >> 2));
   bytes[j + 2] = (byte) ((b3 << 6) | b4);
  }
  if (data[data.length - 2] == '=') {
   b1 = decodingTable[data[data.length - 4]];
   b2 = decodingTable[data[data.length - 3]];
   bytes[bytes.length - 1] = (byte) ((b1 << 2) | (b2 >> 4));
  } else if (data[data.length - 1] == '=') {
   b1 = decodingTable[data[data.length - 4]];
   b2 = decodingTable[data[data.length - 3]];
   b3 = decodingTable[data[data.length - 2]];
   bytes[bytes.length - 2] = (byte) ((b1 << 2) | (b2 >> 4));
   bytes[bytes.length - 1] = (byte) ((b2 << 4) | (b3 >> 2));
  } else {
   b1 = decodingTable[data[data.length - 4]];
   b2 = decodingTable[data[data.length - 3]];
   b3 = decodingTable[data[data.length - 2]];
   b4 = decodingTable[data[data.length - 1]];
   bytes[bytes.length - 3] = (byte) ((b1 << 2) | (b2 >> 4));
   bytes[bytes.length - 2] = (byte) ((b2 << 4) | (b3 >> 2));
   bytes[bytes.length - 1] = (byte) ((b3 << 6) | b4);
  }
  return bytes;
 }

 public static byte[] decode(String data) {
  byte[] bytes;
  byte b1;
  byte b2;
  byte b3;
  byte b4;
  data = discardNonBase64Chars(data);
  if (data.charAt(data.length() - 2) == '=') {
   bytes = new byte[(((data.length() / 4) - 1) * 3) + 1];
  } else if (data.charAt(data.length() - 1) == '=') {
   bytes = new byte[(((data.length() / 4) - 1) * 3) + 2];
  } else {
   bytes = new byte[((data.length() / 4) * 3)];
  }
  for (int i = 0, j = 0; i < (data.length() - 4); i += 4, j += 3) {
   b1 = decodingTable[data.charAt(i)];
   b2 = decodingTable[data.charAt(i + 1)];
   b3 = decodingTable[data.charAt(i + 2)];
   b4 = decodingTable[data.charAt(i + 3)];
   bytes[j] = (byte) ((b1 << 2) | (b2 >> 4));
   bytes[j + 1] = (byte) ((b2 << 4) | (b3 >> 2));
   bytes[j + 2] = (byte) ((b3 << 6) | b4);
  }
  if (data.charAt(data.length() - 2) == '=') {
   b1 = decodingTable[data.charAt(data.length() - 4)];
   b2 = decodingTable[data.charAt(data.length() - 3)];
   bytes[bytes.length - 1] = (byte) ((b1 << 2) | (b2 >> 4));
  } else if (data.charAt(data.length() - 1) == '=') {
   b1 = decodingTable[data.charAt(data.length() - 4)];
   b2 = decodingTable[data.charAt(data.length() - 3)];
   b3 = decodingTable[data.charAt(data.length() - 2)];
   bytes[bytes.length - 2] = (byte) ((b1 << 2) | (b2 >> 4));
   bytes[bytes.length - 1] = (byte) ((b2 << 4) | (b3 >> 2));
  } else {
   b1 = decodingTable[data.charAt(data.length() - 4)];
   b2 = decodingTable[data.charAt(data.length() - 3)];
   b3 = decodingTable[data.charAt(data.length() - 2)];
   b4 = decodingTable[data.charAt(data.length() - 1)];
   bytes[bytes.length - 3] = (byte) ((b1 << 2) | (b2 >> 4));
   bytes[bytes.length - 2] = (byte) ((b2 << 4) | (b3 >> 2));
   bytes[bytes.length - 1] = (byte) ((b3 << 6) | b4);
  }
  return bytes;
 }

 private static byte[] discardNonBase64Bytes(byte[] data) {
  byte[] temp = new byte[data.length];
  int bytesCopied = 0;
  for (int i = 0; i < data.length; i++) {
   if (isValidBase64Byte(data[i])) {
    temp[bytesCopied++] = data[i];
   }
  }
  byte[] newData = new byte[bytesCopied];
  System.arraycopy(temp, 0, newData, 0, bytesCopied);
  return newData;
 }

 private static String discardNonBase64Chars(String data) {
  StringBuffer sb = new StringBuffer();
  int length = data.length();
  for (int i = 0; i < length; i++) {
   if (isValidBase64Byte((byte) (data.charAt(i)))) {
    sb.append(data.charAt(i));
   }
  }
  return sb.toString();
 }

 private static boolean isValidBase64Byte(byte b) {
  if (b == '=') {
   return true;
  } else if ((b < 0) || (b >= 128)) {
   return false;
  } else if (decodingTable[b] == -1) {
   return false;
  }
  return true;
 }
}

 

 

转换的实例为：

public static String ReadFile(File file) {
  String result = "";
  FileInputStream fis = null;
  byte[] xml = null;
  try {
   if (file != null) {
    fis = new FileInputStream(file);
    if (fis != null) {
     int len = fis.available();
     xml = new byte[len];
     fis.read(xml);
    }
    base64 enc = new base64();
    byte[] bb = enc.encode(xml);
    result = new String(bb,"UTF-8");
   }
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   if(fis!=null){
    try {
     fis.close();
     fis = null;
    } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
  }
  return result;
 }

此时的result即为转换后的字符型，解析的时候按照java的base64解析即可