如何在没有HttpEntity的情况下使用Volley发送多部分请求

Question

我正在遵循解决方案，从如何使用Android volley多部分数据发送多部分请求。但是，自SDK 22以来，httpentity已被弃用，并且在SDK 23上已完全删除。

解决方案是使用openConnection，就像HttpEntity现在在Android上被弃用一样，替代方案是什么?，但我不知道如何使用它的多部分请求

Answer 1

我已经找到了一个解决方案Android中的多部分/表单-数据请求:HttpURLConnection vs OkHttp)

这是我的工作样例代码(测试与ASP。净WebAPI)

MultipartActivity.java

package com.example.volleyapp;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.view.Menu;
import android.view.MenuItem;
import com.android.volley.AuthFailureError;
import com.android.volley.NetworkResponse;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.example.volleyapp.BaseVolleyRequest;
import com.example.volleyapp.VolleySingleton;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
public class MultipartActivity extends Activity {
    final Context mContext = this;
    String mimeType;
    DataOutputStream dos = null;
    String lineEnd = "rn";
    String boundary = "apiclient-" + System.currentTimeMillis();
    String twoHyphens = "--";
    int bytesRead, bytesAvailable, bufferSize;
    byte[] buffer;
    int maxBufferSize = 1024 * 1024;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_multipart);             
        Drawable drawable = ContextCompat.getDrawable(mContext, R.drawable.ic_action_file_attachment_light);
        Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
        final byte[] bitmapData = byteArrayOutputStream.toByteArray();
        String url = "http://192.168.1.100/api/postfile";
        mimeType = "multipart/form-data;boundary=" + boundary;
        BaseVolleyRequest baseVolleyRequest = new BaseVolleyRequest(1, url, new Response.Listener<NetworkResponse>() {
            @Override
            public void onResponse(NetworkResponse response) {
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
            }
        }) {
            @Override
            public String getBodyContentType() {
                return mimeType;
            }
            @Override
            public byte[] getBody() throws AuthFailureError {
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                dos = new DataOutputStream(bos);
                try {
                    dos.writeBytes(twoHyphens + boundary + lineEnd);
                    dos.writeBytes("Content-Disposition: form-data; name="uploaded_file";filename=""
                            + "ic_action_file_attachment_light.png" + """ + lineEnd);
                    dos.writeBytes(lineEnd);
                    ByteArrayInputStream fileInputStream = new ByteArrayInputStream(bitmapData);
                    bytesAvailable = fileInputStream.available();
                    bufferSize = Math.min(bytesAvailable, maxBufferSize);
                    buffer = new byte[bufferSize];
                    // read file and write it into form...
                    bytesRead = fileInputStream.read(buffer, 0, bufferSize);
                    while (bytesRead > 0) {
                        dos.write(buffer, 0, bufferSize);
                        bytesAvailable = fileInputStream.available();
                        bufferSize = Math.min(bytesAvailable, maxBufferSize);
                        bytesRead = fileInputStream.read(buffer, 0, bufferSize);
                    }
                    // send multipart form data necesssary after file data...
                    dos.writeBytes(lineEnd);
                    dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
                    return bos.toByteArray();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                return bitmapData;
            }
        };
        VolleySingleton.getInstance(mContext).addToRequestQueue(baseVolleyRequest);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_multipart, menu);
        return true;
    }
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

BaseVolleyRequest.java:

package com.example.volleyapp;
import com.android.volley.NetworkResponse;
import com.android.volley.ParseError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.HttpHeaderParser;
import com.google.gson.JsonSyntaxException;

public class BaseVolleyRequest extends Request<NetworkResponse> {
    private final Response.Listener<NetworkResponse> mListener;
    private final Response.ErrorListener mErrorListener;
    public BaseVolleyRequest(String url, Response.Listener<NetworkResponse> listener, Response.ErrorListener errorListener) {
        super(0, url, errorListener);
        this.mListener = listener;
        this.mErrorListener = errorListener;
    }
    public BaseVolleyRequest(int method, String url, Response.Listener<NetworkResponse> listener, Response.ErrorListener errorListener) {
        super(method, url, errorListener);
        this.mListener = listener;
        this.mErrorListener = errorListener;
    }
    @Override
    protected Response<NetworkResponse> parseNetworkResponse(NetworkResponse response) {
        try {
            return Response.success(
                    response,
                    HttpHeaderParser.parseCacheHeaders(response));
        } catch (JsonSyntaxException e) {
            return Response.error(new ParseError(e));
        } catch (Exception e) {
            return Response.error(new ParseError(e));
        }
    }
    @Override
    protected void deliverResponse(NetworkResponse response) {
        mListener.onResponse(response);
    }
    @Override
    protected VolleyError parseNetworkError(VolleyError volleyError) {
        return super.parseNetworkError(volleyError);
    }
    @Override
    public void deliverError(VolleyError error) {
        mErrorListener.onErrorResponse(error);
    }
}

Answer 2

在build.gradle

android {
    useLibrary 'org.apache.http.legacy'
}

看到http://developer.android.com/preview/behavior-changes.html behavior-apache-http-client