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我想从httpurlconnection得到Json响应。 在我使用httpclient并从中获取httpresponse我得到json。 但现在我不知道如何从httpurlconnection获取httpresponse。 我试图用这个例子来上传图片：从httpurlconnection得到json响应
A
回答
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非常感谢Yogendra但我不是一个亲在Java中，你可以把这段代码转换到异步HTTP：
public int uploadFile(String sourceFileUri) {
String fileName = sourceFileUri;
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);
if (!sourceFile.isFile()) {
dialog.dismiss();
Log.e("uploadFile", "Source File not exist :"
+uploadFilePath);
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("Source File not exist :"
+uploadFilePath);
}
});
return 0;
}
else
{
try {
// open a URL connection to the Servlet
FileInputStream fileInputStream = new FileInputStream(sourceFile);
URL url = new URL(upLoadServerUri);
HttpResponse respons;
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
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);
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);
// create a buffer of maximum size
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);
StringBuilder builder = new StringBuilder();
builder.append(conn.getResponseCode())
.append(" ")
.append(conn.getResponseMessage())
.append("\n");
Map<String, List<String>> map = conn.getHeaderFields();
for (Map.Entry<String, List<String>> entry : map.entrySet())
{
if (entry.getKey() == null)
continue;
builder.append(entry.getKey())
.append(": ");
List<String> headerValues = entry.getValue();
Iterator<String> it = headerValues.iterator();
if (it.hasNext()) {
builder.append(it.next());
while (it.hasNext()) {
builder.append(", ")
.append(it.next());
}
}
builder.append("\n");
}
Log.i("Response", builder.toString());
// Responses from the server (code and message)
serverResponseCode = conn.getResponseCode();
String serverResponseMessage = String.valueOf(conn.getContentEncoding());
// Log.i("uploadFile", "HTTP Response is : "
// + conn.getHeaderField("server") + ": " + serverResponseCode);
if(serverResponseCode == 200){
runOnUiThread(new Runnable() {
public void run() {
String msg = "File Upload Completed.\n\n See uploaded file here : \n\n"
+" http://www.androidexample.com/media/uploads/";
messageText.setText(msg);
Toast.makeText(UploadToServer.this, "File Upload Complete.",
Toast.LENGTH_SHORT).show();
}
});
}
//close the streams //
fileInputStream.close();
dos.flush();
dos.close();
} catch (MalformedURLException ex) {
dialog.dismiss();
ex.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("MalformedURLException Exception : check script url.");
Toast.makeText(UploadToServer.this, "MalformedURLException", Toast.LENGTH_SHORT).show();
}
});
Log.e("Upload file to server", "error: " + ex.getMessage(), ex);
} catch (Exception e) {
dialog.dismiss();
e.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("Got Exception : see logcat ");
Toast.makeText(UploadToServer.this, "Got Exception : see logcat ",
Toast.LENGTH_SHORT).show();
}
});
Log.e("Upload file to server Exception", "Exception : "
+ e.getMessage(), e);
}
dialog.dismiss();
return serverResponseCode;
} // End else block
}
0
public class getServerDataAsync extends AsyncTask<String, Void, String> {
String fileName;
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;
String msg;
@Override
protected String doInBackground(String... arg0) {
// TODO Auto-generated method stub
fileName = arg0[0];
sourceFile = new File(arg0[0]);
if (!sourceFile.isFile()) {
Log.e("uploadFile", "Source File not exist :" + uploadFilePath);
msg = "Source File not exist :" + uploadFilePath;
} else {
try {
// open a URL connection to the Servlet
FileInputStream fileInputStream = new FileInputStream(
fileName);
URL url = new URL(upLoadServerUri);
HttpResponse respons;
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
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);
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);
// create a buffer of maximum size
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);
StringBuilder builder = new StringBuilder();
builder.append(conn.getResponseCode()).append(" ")
.append(conn.getResponseMessage()).append("\n");
Map<String, List<String>> map = conn.getHeaderFields();
for (Map.Entry<String, List<String>> entry : map.entrySet()) {
if (entry.getKey() == null)
continue;
builder.append(entry.getKey()).append(": ");
List<String> headerValues = entry.getValue();
Iterator<String> it = headerValues.iterator();
if (it.hasNext()) {
builder.append(it.next());
while (it.hasNext()) {
builder.append(", ").append(it.next());
}
}
builder.append("\n");
}
Log.i("Response", builder.toString());
// Responses from the server (code and message)
serverResponseCode = conn.getResponseCode();
String serverResponseMessage = String.valueOf(conn
.getContentEncoding());
// Log.i("uploadFile", "HTTP Response is : "
// + conn.getHeaderField("server") + ": " +
// serverResponseCode);
if (serverResponseCode == 200) {
msg = "File Upload Completed.\n\n See uploaded file here : \n\n"
+ " http://www.androidexample.com/media/uploads/";
}
// close the streams //
fileInputStream.close();
dos.flush();
dos.close();
} catch (MalformedURLException ex) {
ex.printStackTrace();
msg = "MalformedURLException Exception : check script url.";
Log.e("Upload file to server", "error: " + ex.getMessage(),
ex);
} catch (Exception e) {
e.printStackTrace();
msg = "Got Exception : see logcat ";
Log.e("Upload file to server Exception",
"Exception : " + e.getMessage(), e);
}
} // End else block
return msg;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
messageText.setText(result);
}
}
呼叫异步类别为
new getServerDataAsync().execute("source url");
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使用它。它非常简单，有更多的好处。 http://loopj.com/android-async-http/ – Yogendra
谢谢我试试。 – Ali
它的gradle :(我使用Eclipse !!! – Ali