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(Android™) Building a multipart/form-data Request for HTTP UploadUploading files to a web server typically requires building a multipart/form-data request where the files are contained in the sub-parts of the MIME request. Note: HTTP uploads require code on the server-side to receive the upload. For example, see Complete C# ASP.NET HTTP Upload Example This example produces the following HTTP multipart/form-data request: POST /something HTTP/1.1 Content-Type: multipart/form-data; boundary=------------070002080409050901090203 Host: domain Content-Length: 546 --------------070002080409050901090203 Content-Disposition: form-data; name="fileA"; filename="fileA.txt" Content-Type: text/plain This is the contents of file A --------------070002080409050901090203 Content-Disposition: form-data; name="fileB"; filename="fileB.txt" Content-Type: text/plain This is the contents of file B --------------070002080409050901090203 Content-Disposition: form-data; name="fileC"; filename="fileC.txt" Content-Type: text/plain This is the contents of file C --------------070002080409050901090203--
// Important: Don't forget to include the call to System.loadLibrary // as shown at the bottom of this code sample. package com.test; import android.app.Activity; import com.chilkatsoft.*; import android.widget.TextView; import android.os.Bundle; public class SimpleActivity extends Activity { private static final String TAG = "Chilkat"; // Called when the activity is first created. @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // This example demonstrates building a multipart/form-data request. CkHttpRequest req = new CkHttpRequest(); // The ContentType, HttpVerb, and Path properties should // always be explicitly set. req.put_HttpVerb("POST"); req.put_Path("/something"); req.put_ContentType("multipart/form-data"); // The contents and name of each file to be uploaded is provided // by calling any of the following methods: // AddBytesForUpload // AddBytesForUpload2 // AddFileForUpload // AddFileForUpload2 // AddStringForUpload // AddStringForUpload2 // For this example, we'll provide the contents of the files to be uploaded // directly as in-memory strings. req.AddStringForUpload("fileA","fileA.txt","This is the contents of file A","utf-8"); req.AddStringForUpload("fileB","fileB.txt","This is the contents of file B","utf-8"); req.AddStringForUpload("fileC","fileC.txt","This is the contents of file C","utf-8"); // View the request that would be sent if SynchronousRequest was called: String requestMime = req.generateRequestText(); Log.i(TAG, requestMime); // A few important comments about the HTTP request that is generated: // // 1) Chilkat automatically generates a random boundary string. In 99.999% of cases, this should // be sufficient. // 2) The Content-Length header is automatically generated based on the actual length of the MIME message // that follows the intial (topmost) MIME header. // 3) The HOST header will automatically get filled in with the actual domain when SynchronousRequest // is called } static { System.loadLibrary("chilkat"); // Note: If the incorrect library name is passed to System.loadLibrary, // then you will see the following error message at application startup: //"The application <your-application-name> has stopped unexpectedly. Please try again." } } |
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