Question

请建议使用JSON发送和接收图像文件的最佳方式？

Answer 1

Android：使用http POST multi-part

上传图片或文件

通过使用多部分，您可以将SD卡中的文件以及位图图像上传为文件。

先决条件：httpmime-4.1-beta1.jar

Android SDK使用版本3.0的apache http Client。这不支持mime类型。

package com.isummation.fileupload;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.InputStreamReader;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.ByteArrayBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.DefaultHttpClient;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;

public class FileUpload extends Activity {
    Bitmap bm;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        try {
            // bm = BitmapFactory.decodeResource(getResources(),
            // R.drawable.forest);
            bm = BitmapFactory.decodeFile("/sdcard/DCIM/forest.png");
            executeMultipartPost();
        } catch (Exception e) {
            Log.e(e.getClass().getName(), e.getMessage());
        }
    }

    public void executeMultipartPost() throws Exception {
        try {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            bm.compress(CompressFormat.JPEG, 75, bos);
            byte[] data = bos.toByteArray();
            HttpClient httpClient = new DefaultHttpClient();
            HttpPost postRequest = new HttpPost(
                    "http://10.0.2.2/cfc/iphoneWebservice.cfc?returnformat=json&amp;method=testUpload");
            ByteArrayBody bab = new ByteArrayBody(data, "forest.jpg");
            // File file= new File("/mnt/sdcard/forest.png");
            // FileBody bin = new FileBody(file);
            MultipartEntity reqEntity = new MultipartEntity(
                    HttpMultipartMode.BROWSER_COMPATIBLE);
            reqEntity.addPart("uploaded", bab);
            reqEntity.addPart("photoCaption", new StringBody("sfsdfsdf"));
            postRequest.setEntity(reqEntity);
            HttpResponse response = httpClient.execute(postRequest);
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    response.getEntity().getContent(), "UTF-8"));
            String sResponse;
            StringBuilder s = new StringBuilder();

            while ((sResponse = reader.readLine()) != null) {
                s = s.append(sResponse);
            }
            System.out.println("Response: " + s);
        } catch (Exception e) {
            // handle exception here
            Log.e(e.getClass().getName(), e.getMessage());
        }
    }
}

见以下链接：

Multipart Image Upload

在webservice中以JSON发送和接收图像文件的最佳方式？

1 个答案: