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
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 * <code>sun.misc.BASE64Encoder.encodeBuffer(byte[])</code>. * * @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 <code>in</code> to be processed. * @param iLen * Number of bytes to be processed in <code>in</code>, starting * at <code>iOff</code>. * @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 <code>in</code>. * @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 <code>in</code> to be processed. * @param iLen * Number of bytes to process in <code>in</code>, starting at * <code>iOff</code>. * @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 paddingint oLen = ((iLen + 2) / 3) * 4; // output length including paddingchar[] 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 * <code>sun.misc.BASE64Decoder.decodeBuffer(String)</code>. * * @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 <code>in</code> to be * processed. * @param iLen * Number of characters to process in <code>in</code>, starting * at <code>iOff</code>. * @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() {}}