Upload and download _android of Android HTTP implementation files

Recently done a project which involves uploading and downloading features to the file, we all know that the realization of this function has been rotten street, hence, directly from the internet to swing a bunch of code, the result, found that the code is really mixed, not write incomplete, that is, there are problems, so they have to reorganize some, they sent out, I hope more people will enjoy it.

File Upload

Through the org.apache.commons.httpclient.HttpClient to achieve file upload, the jar package can be directly from the Internet search, download.

  /** * @param mcontext context * @param targeturl File upload address * @param filePath file path/public void UploadFile (FINA L activity mcontext, String targeturl, Final String filePath) {System.out.println ("TargetUrl: + targeturl +" file

    Path: "+ FilePath);
      if (Textutils.isempty (FilePath)) {Toast.maketext (mcontext, "file does not exist", toast.length_short). Show ();
    Return
        Final Postmethod filepost = new Postmethod (targeturl) {//This is used in Chinese garbled public String Getrequestcharset () {
      return "UTF-8";

    }
    };

      Try {final HttpClient client = new HttpClient ();

      File File = new file (FilePath);

        if (file.exists () && file.isfile ()) {Long fileSize = File.length ();
          if (fileSize >= 5 * 1024 * 1024) {Toast.maketext (mcontext, "file must not be greater than 5M", Toast.length_short). Show ();
        Return

        } else {Toast.maketext (mcontext, "file does not exist", toast.length_short). Show ();
      Return
}
      Upload files and parameters part[] Parts = new Part[]{new Customfilepart (File.getname (), file), new Stringpart ("File
      Name ", File.getname ()," UTF-8 ")};

      Filepost.setrequestentity (New multipartrequestentity (Parts, Filepost.getparams ()));

          New Thread (New Runnable () {@Override public void run () {int statuscode = 0;
          try {statuscode = Client.executemethod (filepost);
          catch (IOException e) {e.printstacktrace ();

          Final int finalstatuscode = statuscode; Mcontext.runonuithread (New Runnable () {@Override public void run () {if finalstat
              Uscode = = HTTPSTATUS.SC_OK) {toast.maketext (Mcontext, "Upload succeeded", Toast.length_short). Show ();
              else {toast.maketext (Mcontext, "Upload failed", Toast.length_short). Show ();
        }
            }
          });

    }). Start (); catch (exceptioN ex) {ex.printstacktrace ();

 }
  }

HttpClient use, often encounter garbled problem, we mainly in two places to solve garbled problem:
• Replication Postmethod Getrequestcharset, specifying request encoding

 Final Postmethod filepost = new Postmethod (targeturl) {//This is used to Chinese garbled public
      String Getrequestcharset () {return
        " UTF-8 ";
      }
    };

• Custom Filepart, specifying request parameter encoding

 /**
 * Solve Chinese file name garbled * * * public
class Customfilepart extends Filepart {public
  Customfilepart (String filename, file file)
      throws FileNotFoundException {
    super (filename, file);
  }

  protected void Senddispositionheader (OutputStream out) throws IOException {
    super.senddispositionheader (out);
    String filename = GetSource (). GetFileName ();
    if (filename!= null) {
      out.write (encodingutil.getasciibytes (file_name));
      Out.write (quote_bytes);
      Out.write (encodingutil.getbytes (filename, "UTF-8"));
      Out.write (quote_bytes);}}

To add parameters using Customfilepart:

part[] parts = new Part[]{new Customfilepart (File.getname (), file),
          new Stringpart ("FileName", File.getname (), " UTF-8 ")};
Filepost.setrequestentity (New multipartrequestentity (Parts, Filepost.getparams ()));

File download

Download files via HttpURLConnection.

  /** * @param urlstr file Address * @param path file Save paths * @param filename filename * @return file's absolute path/public Str
    ing downfile (string urlstr, String path, String fileName) {InputStream inputstream = null;

    String filePath = null;
      try {FileUtils FileUtils = new FileUtils ();
        Determine if the file exists if (fileutils.isfileexist (path + fileName)) {System.out.println ("exits");
      FilePath = sdpath + path + fileName;
        else {//get IO Stream inputstream = Getinputstreamfromurl (URLSTR);
        Writes files from the input stream to the SD card file Resultfile = fileutils.write2sdfrominput (path, fileName, InputStream);
        if (resultfile!= null) {FilePath = Resultfile.getpath ();
    A catch (Exception e) {e.printstacktrace ());
      Finally {try {if (InputStream!= null) inputstream.close ();
      catch (IOException e) {e.printstacktrace ();
  } return FilePath;
}

  /**   * @param urlstr * @return/Public InputStream Getinputstreamfromurl (String urlstr) {by URL
    HttpURLConnection Urlconn;
    InputStream inputstream = null;
      try {url = new URL (urlstr);
      Urlconn = (httpurlconnection) url.openconnection ();

    InputStream = Urlconn.getinputstream ();
    catch (Exception e) {e.printstacktrace ();
  return inputstream;

 }

The file download is actually very simple, plainly, is to get inputstream through HTTP, and then through parsing InputStream and write to the file.
Read InputStream and write to SDcard.

/** * Writes data from a InputStream to SD card * @param path File Save paths * @param fileName file
                 Saved name * @param input stream * @return File/Public files Write2sdfrominput (string path, String fileName,
    InputStream input) {file file = null;
    OutputStream output = null;
      try {//Create folder Createsddir (path);

      Create file = createsdfile (path + fileName);
      Opens the output stream, prepares to write the file output = new FileOutputStream (file);
      Buffers byte[] buffer = new Byte[filesize];
      int count; while (count = input.read (buffer))!=-1) {//here, be sure to write the file in this way, otherwise there will be file write errors, data loss problems output.write (buffer, 0
      , count);
    } output.flush ();
    catch (Exception e) {e.printstacktrace ();
        Finally {try {output.close ();
      Input.close ();
      catch (IOException e) {e.printstacktrace ();
  } return file; }

InputStream write to SDcard card, there is a very important place, first look at the OutputStream write method:

I recommend using the second method of write (byte[] b, int off, int len) to avoid data loss. So write the file code as follows:

 while (count = input.read (buffer))!=-1) {
 //here, be sure to write the file in this way, otherwise there will be file write errors, data loss problems
 output.write (buffer, 0, count);
}

Source Address: Https://github.com/zuiwuyuan/Http_Uploader_Downloader

The above is my arrangement of the Android HTTP implementation file upload and download methods, I hope to help more people.