我已经有一个Request子类用于http发送到服务器。问题是，我不知道如何为文件添加参数。将字符串发布到服务器很容易。但我需要将文件添加为不同的参数。我该怎么办？
public class AddNewPetRequest extends Request<JSONObject> {
private Response.Listener<JSONObject> listener;
public AddNewPetRequest(String url, Map<String, String> params,
Response.Listener<JSONObject> reponseListener, Response.ErrorListener errorListener) {
super(Request.Method.GET, url, errorListener);
this.listener = reponseListener;
this.params = params;
}
public AddNewPetRequest(int method, String url, Map<String, String> params,
Response.Listener<JSONObject> reponseListener, Response.ErrorListener errorListener) {
super(method, url, errorListener);
this.listener = reponseListener;
this.params = params;
}
protected Map<String, String> getParams()
throws com.android.volley.AuthFailureError {
return params;
};
@Override
protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
try {
String jsonString = new String(response.data,
HttpHeaderParser.parseCharset(response.headers));
return Response.success(new JSONObject(jsonString),
HttpHeaderParser.parseCacheHeaders(response));
} catch (UnsupportedEncodingException e) {
return Response.error(new ParseError(e));
} catch (JSONException je) {
return Response.error(new ParseError(je));
}
}
@Override
protected void deliverResponse(JSONObject response) {
// TODO Auto-generated method stub
listener.onResponse(response);
}
}
更新问题： 我在stackoverflow中遵循其中一个答案的模式，我想出了这个实现：
public class MultipartRequest extends Request<String> {
private MultipartEntity entity = new MultipartEntity();
private final Response.Listener<String> mListener;
private HashMap<String, String> mParams;
public MultipartRequest(String url, Response.ErrorListener errorListener, Response.Listener<String> listener)
{
super(Method.POST, url, errorListener);
mListener = listener;
buildMultipartEntity();
}
private void buildMultipartEntity()
{
entity.addPart("profile_picture", new FileBody(new File("/storage/emulated/0/Pictures/VSCOCam/2015-07-31 11.55.14 1.jpg")));
try
{
entity.addPart("user_id", new StringBody("15"));
entity.addPart("name", new StringBody("Bogs"));
entity.addPart("gender", new StringBody("Male"));
entity.addPart("date_birth", new StringBody("1999-12-5"));
entity.addPart("breed", new StringBody("monkey"));
}
catch (UnsupportedEncodingException e)
{
VolleyLog.e("UnsupportedEncodingException");
}
}
@Override
public String getBodyContentType()
{
return entity.getContentType().getValue();
}
@Override
public byte[] getBody() throws AuthFailureError
{
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try
{
entity.writeTo(bos);
}
catch (IOException e)
{
VolleyLog.e("IOException writing to ByteArrayOutputStream");
}
return bos.toByteArray();
}
@Override
protected Response<String> parseNetworkResponse(NetworkResponse response)
{
return Response.success("Uploaded", getCacheEntry());
}
@Override
protected void deliverResponse(String response)
{
mListener.onResponse(response);
}
当我将此请求添加到我的请求队列时，它会响应com.android.volley.TimeoutError，但如果检查数据库，请求会执行并向表中添加项目但是配置文件图片上传只有1个字节尺寸。另一个问题，我的数据库项目增加了两次。
问题已解决我已经通过设置请求时间来修复此问题。发生的事情是我在凌空库的默认超时后无法从我的服务器获得响应，所以通过调用并将此方法设置为我的请求队列来设置我的超时：
multipartRequest.setRetryPolicy(new DefaultRetryPolicy(1000 * 60, DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
答案 0 :(得分：8)
我评论过，但也许你还没读过。所以这是我的答案。
如果您想使用Volley，可以参考以下链接：
答案 1 :(得分：0)
这种方法是否可以帮助您：
public int uploadFile(String sourceFileUri, String fileName)
{
String upLoadServerUri = "your_api_url";
HttpURLConnection conn = null;
DataOutputStream dos = null;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
File sourceFile = new File(sourceFileUri);
//errMsg=Environment.getExternalStorageDirectory().getAbsolutePath();
if (!sourceFile.isFile())
{
Log.e("uploadFile", "Source File Does not exist");
return 0;
}
try {
// open a URL connection to the Servlet
FileInputStream fileInputStream = new FileInputStream(sourceFile);
URL url = new URL(upLoadServerUri);
conn = (HttpURLConnection) url.openConnection(); // Open a HTTP connection to the URL
conn.setDoInput(true); // Allow Inputs
conn.setDoOutput(true); // Allow Outputs
conn.setUseCaches(false); // Don't use a Cached Copy
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("ENCTYPE", "multipart/form-data");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
conn.setRequestProperty("uploaded_file", fileName);
//conn.setRequestProperty("pid", "4");
dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\""+ fileName + "\"" + lineEnd);
dos.writeBytes(lineEnd);
bytesAvailable = fileInputStream.available(); // create a buffer of maximum size
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);
// Responses from the server (code and message)
serverResponseCode = conn.getResponseCode();
String serverResponseMessage = conn.getResponseMessage();
Log.i("uploadFile", "HTTP Response is : " + serverResponseMessage + ": " + serverResponseCode);
if(serverResponseCode != 200)
{
getActivity().runOnUiThread(new Runnable()
{
public void run() {
Toast.makeText(context, "Il y a une erreur l'hors du trasfert de l'image.", Toast.LENGTH_SHORT).show();
}
});
}
//close the streams //
fileInputStream.close();
dos.flush();
dos.close();
} catch (MalformedURLException ex) {
// dialog.dismiss();
ex.printStackTrace();
Toast.makeText(context, "MalformedURLException", Toast.LENGTH_SHORT).show();
Log.e("Upload file to server", "error: " + ex.getMessage(), ex);
} catch (Exception e) {
// dialog.dismiss();
e.printStackTrace();
Toast.makeText(context,errMsg+ "Exception : " + e.getMessage(), Toast.LENGTH_SHORT).show();
Log.e("Upload file to server Exception", "Exception : " + e.getMessage(), e);
}
// dialog.dismiss();
return serverResponseCode;
}