import java.io.ByteArrayOutputStream;
import java.io.File;import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Environment;
import android.util.Base64;public class PictureUtil {/*** 把bitmap转换成String* * @param filePath* @return*/public static String bitmapToString(String filePath) {Bitmap bm = getSmallBitmap(filePath);ByteArrayOutputStream baos = new ByteArrayOutputStream();bm.compress(Bitmap.CompressFormat.JPEG, 40, baos);byte[] b = baos.toByteArray();return Base64.encodeToString(b, Base64.DEFAULT);}/*** 根据路径获得图片并压缩返回bitmap用于显示* * @param imagesrc* @return*/public static Bitmap getSmallBitmap(String filePath) {final BitmapFactory.Options options = new BitmapFactory.Options();options.inJustDecodeBounds = true;BitmapFactory.decodeFile(filePath, options);// Calculate inSampleSizeoptions.inSampleSize = calculateInSampleSize(options, 480, 800);// Decode bitmap with inSampleSize setoptions.inJustDecodeBounds = false;return BitmapFactory.decodeFile(filePath, options);}/*** 计算图片的缩放值* * @param options* @param reqWidth* @param reqHeight* @return*/public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {// Raw height and width of imagefinal int height = options.outHeight;final int width = options.outWidth;int inSampleSize = 1;if (height > reqHeight || width > reqWidth) {// Calculate ratios of height and width to requested height and// widthfinal int heightRatio = Math.round((float) height / (float) reqHeight);final int widthRatio = Math.round((float) width / (float) reqWidth);// Choose the smallest ratio as inSampleSize value, this will// guarantee// a final image with both dimensions larger than or equal to the// requested height and width.inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;}return inSampleSize;}}

/*** 将图片转成String的形式，进行上传** @param json* @return * @return String  * @author hsx* @time 2014-3-21上午10:47:30*/public String sendPost(String json) {try {HttpURLConnection httpcon = (HttpURLConnection) ((new URL(POST_URL).openConnection()));httpcon.setDoOutput(true);httpcon.setRequestProperty("Content-Type", "application/json");httpcon.setRequestProperty("Accept", "application/json");httpcon.setRequestMethod("POST");httpcon.connect();byte[] outputBytes = json.getBytes("UTF-8");OutputStream os = httpcon.getOutputStream();os.write(outputBytes);os.close();int status = httpcon.getResponseCode();if (status != 200) {throw new IOException("Post failed with error code " + status);}BufferedReader br = new BufferedReader(new InputStreamReader(httpcon.getInputStream()));StringBuilder sb = new StringBuilder();String line;while ((line = br.readLine()) != null) {sb.append(line+"\n");}br.close();return sb.toString();} catch (IOException e) {e.printStackTrace();}return null;}