图片转为String传个给服务端
上传头像等图片比较简单的一种就是直接把图片--- >String 再作为参数post给服务端
之所以用post是因为string都会很长~
下面见代码
try {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
photo.compress(Bitmap.CompressFormat.JPEG, 60, stream);
byte[] b = stream.toByteArray();
// 将图片流以字符串形式存储下来
String tp = new String(Base64Coder.encodeLines(b));//tp 就是最终的参数
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}为了检验本地可以尝试把string - 〉图片
byte[] tempb = Base64Coder.decode(tp);
Bitmap bitmap = BitmapFactory.decodeByteArray(tempb, 0, tempb.length);
ImageVIew.setImageBitmap(bitmap);另外这个方法用到两个java类在下面
import java.io.IOException;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
public class Base64 {
/** prevents anyone from instantiating this class */
private Base64() {
}
/**
* This character array provides the alphabet map from RFC1521.
*/
private final static char ALPHABET[] = {
// 0 1 2 3 4 5 6 7
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', // 0
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 1
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 2
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', // 3
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', // 4
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', // 5
'w', 'x', 'y', 'z', '0', '1', '2', '3', // 6
'4', '5', '6', '7', '8', '9', '+', '/' // 7
};
/**
* Decodes a 7 bit Base64 character into its binary value.
*/
private static int valueDecoding[] = new int[128];
/**
* initializes the value decoding array from the character map
*/
static {
for (int i = 0; i < valueDecoding.length; i++) {
valueDecoding[i] = -1;
}
for (int i = 0; i < ALPHABET.length; i++) {
valueDecoding[ALPHABET[i]] = i;
}
}
/**
* Converts a byte array into a Base64 encoded string.
*
* @param data
* bytes to encode
* @param offset
* which byte to start at
* @param length
* how many bytes to encode; padding will be added if needed
* @return base64 encoding of data; 4 chars for every 3 bytes
*/
public static String encode(byte[] data, int offset, int length) {
int i;
int encodedLen;
char[] encoded;
// 4 chars for 3 bytes, run input up to a multiple of 3
encodedLen = (length + 2) / 3 * 4;
encoded = new char[encodedLen];
for (i = 0, encodedLen = 0; encodedLen < encoded.length; i += 3, encodedLen += 4) {
encodeQuantum(data, offset + i, length - i, encoded, encodedLen);
}
return new String(encoded);
}
/**
* Encodes 1, 2, or 3 bytes of data as 4 Base64 chars.
*
* @param in
* buffer of bytes to encode
* @param inOffset
* where the first byte to encode is
* @param len
* how many bytes to encode
* @param out
* buffer to put the output in
* @param outOffset
* where in the output buffer to put the chars
*/
private static void encodeQuantum(byte in[], int inOffset, int len,
char out[], int outOffset) {
byte a = 0, b = 0, c = 0;
a = in[inOffset];
out[outOffset] = ALPHABET[(a >>> 2) & 0x3F];
if (len > 2) {
b = in[inOffset + 1];
c = in[inOffset + 2];
out[outOffset + 1] = ALPHABET[((a << 4) & 0x30) + ((b >>> 4) & 0xf)];
out[outOffset + 2] = ALPHABET[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)];
out[outOffset + 3] = ALPHABET[c & 0x3F];
} else if (len > 1) {
b = in[inOffset + 1];
out[outOffset + 1] = ALPHABET[((a << 4) & 0x30) + ((b >>> 4) & 0xf)];
out[outOffset + 2] = ALPHABET[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)];
out[outOffset + 3] = '=';
} else {
out[outOffset + 1] = ALPHABET[((a << 4) & 0x30) + ((b >>> 4) & 0xf)];
out[outOffset + 2] = '=';
out[outOffset + 3] = '=';
}
}
/**
* Converts a Base64 encoded string to a byte array.
*
* @param encoded
* Base64 encoded data
* @return decode binary data; 3 bytes for every 4 chars - minus padding
* @exception IOException
* is thrown, if an I/O error occurs reading the data
*/
public static byte[] decode(String encoded) throws IOException {
return decode(encoded, 0, encoded.length());
}
/**
* Converts an embedded Base64 encoded string to a byte array.
*
* @param encoded
* a String with Base64 data embedded in it
* @param offset
* which char of the String to start at
* @param length
* how many chars to decode; must be a multiple of 4
* @return decode binary data; 3 bytes for every 4 chars - minus padding
* @exception IOException
* is thrown, if an I/O error occurs reading the data
*/
public static byte[] decode(String encoded, int offset, int length)
throws IOException {
int i;
int decodedLen;
byte[] decoded;
// the input must be a multiple of 4
if (length % 4 != 0) {
throw new IOException("Base64 string length is not multiple of 4");
}
// 4 chars for 3 bytes, but there may have been pad bytes
decodedLen = length / 4 * 3;
if (encoded.charAt(offset + length - 1) == '=') {
decodedLen--;
if (encoded.charAt(offset + length - 2) == '=') {
decodedLen--;
}
}
decoded = new byte[decodedLen];
for (i = 0, decodedLen = 0; i < length; i += 4, decodedLen += 3) {
decodeQuantum(encoded.charAt(offset + i),
encoded.charAt(offset + i + 1),
encoded.charAt(offset + i + 2),
encoded.charAt(offset + i + 3), decoded, decodedLen);
}
return decoded;
}
/**
* Decode 4 Base64 chars as 1, 2, or 3 bytes of data.
*
* @param in1
* first char of quantum to decode
* @param in2
* second char of quantum to decode
* @param in3
* third char of quantum to decode
* @param in4
* forth char of quantum to decode
* @param out
* buffer to put the output in
* @param outOffset
* where in the output buffer to put the bytes
*/
private static void decodeQuantum(char in1, char in2, char in3, char in4,
byte[] out, int outOffset) throws IOException {
int a = 0, b = 0, c = 0, d = 0;
int pad = 0;
a = valueDecoding[in1 & 127];
b = valueDecoding[in2 & 127];
if (in4 == '=') {
pad++;
if (in3 == '=') {
pad++;
} else {
c = valueDecoding[in3 & 127];
}
} else {
c = valueDecoding[in3 & 127];
d = valueDecoding[in4 & 127];
}
if (a < 0 || b < 0 || c < 0 || d < 0) {
throw new IOException("Invalid character in Base64 string");
}
// the first byte is the 6 bits of a and 2 bits of b
out[outOffset] = (byte) (((a << 2) & 0xfc) | ((b >>> 4) & 3));
if (pad < 2) {
// the second byte is 4 bits of b and 4 bits of c
out[outOffset + 1] = (byte) (((b << 4) & 0xf0) | ((c >>> 2) & 0xf));
if (pad < 1) {
// the third byte is 2 bits of c and 4 bits of d
out[outOffset + 2] = (byte) (((c << 6) & 0xc0) | (d & 0x3f));
}
}
}
/**
* 将字符串转换成Bitmap类型
*
* @param string
* @return
*/
public static Bitmap stringtoBitmap(String string) {
Bitmap bitmap = null;
try {
byte[] bitmapArray;
bitmapArray = decode(string);
bitmap = BitmapFactory.decodeByteArray(bitmapArray, 0,bitmapArray.length);
} catch (Exception e) {
e.printStackTrace();
}
return bitmap;
}
}public class Base64Coder {
// The line separator string of the operating system.
private static final String systemLineSeparator = System
.getProperty("line.separator");
// Mapping table from 6-bit nibbles to Base64 characters.
private static char[] map1 = new char[64];
static {
int i = 0;
for (char c = 'A'; c <= 'Z'; c++)
map1[i++] = c;
for (char c = 'a'; c <= 'z'; c++)
map1[i++] = c;
for (char c = '0'; c <= '9'; c++)
map1[i++] = c;
map1[i++] = '+';
map1[i++] = '/';
}
// Mapping table from Base64 characters to 6-bit nibbles.
private static byte[] map2 = new byte[128];
static {
for (int i = 0; i < map2.length; i++)
map2[i] = -1;
for (int i = 0; i < 64; i++)
map2[map1[i]] = (byte) i;
}
/**
* Encodes a string into Base64 format. No blanks or line breaks are
* inserted.
*
* @param s
* A String to be encoded.
* @return A String containing the Base64 encoded data.
*/
public static String encodeString(String s) {
return new String(encode(s.getBytes()));
}
/**
* Encodes a byte array into Base 64 format and breaks the output into lines
* of 76 characters. This method is compatible with
* sun.misc.BASE64Encoder.encodeBuffer(byte[]).
*
* @param in
* An array containing the data bytes to be encoded.
* @return A String containing the Base64 encoded data, broken into lines.
*/
public static String encodeLines(byte[] in) {
return encodeLines(in, 0, in.length, 76, systemLineSeparator);
}
/**
* Encodes a byte array into Base 64 format and breaks the output into
* lines.
*
* @param in
* An array containing the data bytes to be encoded.
* @param iOff
* Offset of the first byte in in to be processed.
* @param iLen
* Number of bytes to be processed in in, starting
* at iOff.
* @param lineLen
* Line length for the output data. Should be a multiple of 4.
* @param lineSeparator
* The line separator to be used to separate the output lines.
* @return A String containing the Base64 encoded data, broken into lines.
*/
public static String encodeLines(byte[] in, int iOff, int iLen,
int lineLen, String lineSeparator) {
int blockLen = (lineLen * 3) / 4;
if (blockLen <= 0)
throw new IllegalArgumentException();
int lines = (iLen + blockLen - 1) / blockLen;
int bufLen = ((iLen + 2) / 3) * 4 + lines * lineSeparator.length();
StringBuilder buf = new StringBuilder(bufLen);
int ip = 0;
while (ip < iLen) {
int l = Math.min(iLen - ip, blockLen);
buf.append(encode(in, iOff + ip, l));
buf.append(lineSeparator);
ip += l;
}
return buf.toString();
}
/**
* Encodes a byte array into Base64 format. No blanks or line breaks are
* inserted in the output.
*
* @param in
* An array containing the data bytes to be encoded.
* @return A character array containing the Base64 encoded data.
*/
public static char[] encode(byte[] in) {
return encode(in, 0, in.length);
}
/**
* Encodes a byte array into Base64 format. No blanks or line breaks are
* inserted in the output.
*
* @param in
* An array containing the data bytes to be encoded.
* @param iLen
* Number of bytes to process in in.
* @return A character array containing the Base64 encoded data.
*/
public static char[] encode(byte[] in, int iLen) {
return encode(in, 0, iLen);
}
/**
* Encodes a byte array into Base64 format. No blanks or line breaks are
* inserted in the output.
*
* @param in
* An array containing the data bytes to be encoded.
* @param iOff
* Offset of the first byte in in to be processed.
* @param iLen
* Number of bytes to process in in, starting at
* iOff.
* @return A character array containing the Base64 encoded data.
*/
public static char[] encode(byte[] in, int iOff, int iLen) {
int oDataLen = (iLen * 4 + 2) / 3; // output length without padding
int oLen = ((iLen + 2) / 3) * 4; // output length including padding
char[] out = new char[oLen];
int ip = iOff;
int iEnd = iOff + iLen;
int op = 0;
while (ip < iEnd) {
int i0 = in[ip++] & 0xff;
int i1 = ip < iEnd ? in[ip++] & 0xff : 0;
int i2 = ip < iEnd ? in[ip++] & 0xff : 0;
int o0 = i0 >>> 2;
int o1 = ((i0 & 3) << 4) | (i1 >>> 4);
int o2 = ((i1 & 0xf) << 2) | (i2 >>> 6);
int o3 = i2 & 0x3F;
out[op++] = map1[o0];
out[op++] = map1[o1];
out[op] = op < oDataLen ? map1[o2] : '=';
op++;
out[op] = op < oDataLen ? map1[o3] : '=';
op++;
}
return out;
}
/**
* Decodes a string from Base64 format. No blanks or line breaks are allowed
* within the Base64 encoded input data.
*
* @param s
* A Base64 String to be decoded.
* @return A String containing the decoded data.
* @throws IllegalArgumentException
* If the input is not valid Base64 encoded data.
*/
public static String decodeString(String s) {
return new String(decode(s));
}
/**
* Decodes a byte array from Base64 format and ignores line separators, tabs
* and blanks. CR, LF, Tab and Space characters are ignored in the input
* data. This method is compatible with
* sun.misc.BASE64Decoder.decodeBuffer(String).
*
* @param s
* A Base64 String to be decoded.
* @return An array containing the decoded data bytes.
* @throws IllegalArgumentException
* If the input is not valid Base64 encoded data.
*/
public static byte[] decodeLines(String s) {
char[] buf = new char[s.length() + 3];
int p = 0;
for (int ip = 0; ip < s.length(); ip++) {
char c = s.charAt(ip);
if (c != ' ' && c != '\r' && c != '\n' && c != '\t')
buf[p++] = c;
}
while ((p % 4) != 0)
buf[p++] = '0';
return decode(buf, 0, p);
}
/**
* Decodes a byte array from Base64 format. No blanks or line breaks are
* allowed within the Base64 encoded input data.
*
* @param s
* A Base64 String to be decoded.
* @return An array containing the decoded data bytes.
* @throws IllegalArgumentException
* If the input is not valid Base64 encoded data.
*/
public static byte[] decode(String s) {
return decode(s.toCharArray());
}
/**
* Decodes a byte array from Base64 format. No blanks or line breaks are
* allowed within the Base64 encoded input data.
*
* @param in
* A character array containing the Base64 encoded data.
* @return An array containing the decoded data bytes.
* @throws IllegalArgumentException
* If the input is not valid Base64 encoded data.
*/
public static byte[] decode(char[] in) {
return decode(in, 0, in.length);
}
/**
* Decodes a byte array from Base64 format. No blanks or line breaks are
* allowed within the Base64 encoded input data.
*
* @param in
* A character array containing the Base64 encoded data.
* @param iOff
* Offset of the first character in in to be
* processed.
* @param iLen
* Number of characters to process in in, starting
* at iOff.
* @return An array containing the decoded data bytes.
* @throws IllegalArgumentException
* If the input is not valid Base64 encoded data.
*/
public static byte[] decode(char[] in, int iOff, int iLen) {
if (iLen % 4 != 0)
throw new IllegalArgumentException(
"Length of Base64 encoded input string is not a multiple of 4.");
while (iLen > 0 && in[iOff + iLen - 1] == '=')
iLen--;
int oLen = (iLen * 3) / 4;
byte[] out = new byte[oLen];
int ip = iOff;
int iEnd = iOff + iLen;
int op = 0;
while (ip < iEnd) {
int i0 = in[ip++];
int i1 = in[ip++];
int i2 = ip < iEnd ? in[ip++] : 'A';
int i3 = ip < iEnd ? in[ip++] : 'A';
if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127)
throw new IllegalArgumentException(
"Illegal character in Base64 encoded data.");
int b0 = map2[i0];
int b1 = map2[i1];
int b2 = map2[i2];
int b3 = map2[i3];
if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0)
throw new IllegalArgumentException(
"Illegal character in Base64 encoded data.");
int o0 = (b0 << 2) | (b1 >>> 4);
int o1 = ((b1 & 0xf) << 4) | (b2 >>> 2);
int o2 = ((b2 & 3) << 6) | b3;
out[op++] = (byte) o0;
if (op < oLen)
out[op++] = (byte) o1;
if (op < oLen)
out[op++] = (byte) o2;
}
return out;
}
// Dummy constructor.
private Base64Coder() {
}
}