Question

I am successfully using the HttpURLConnection to upload *.txt files. Now I have the task to change the program for uploading every filetype. I tried my program with .xls files. The files are placed on the server, but the content isn’t readable.

Like you see here:

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Sheet1Sheet2Sheet3Worksheets4 $€,þÿ3à…ŸòùOh«‘+’³Ù0Å“8Å’@x„äMicrosoft CorporationMicrosoft Excel@â€Ã¸(º»þÿ3à…ŸòùOh«‘+'³Ù0Ëœ8Å’@x„äMicrosoft CorporationMicrosoft Excel@â€Ã¸(º»@â€Ã¸(º»Ì�á°Ãâ\pMicrosoft Corporation

Here my code snippet:

    HttpURLConnection urlConn = (HttpURLConnection) new URL(testdocumentURL).openConnection(); 
    urlConn.setRequestMethod("POST");
    urlConn.setRequestProperty("X-Method-Override", "PUT");     
    urlConn.setRequestProperty("Content-Type", "text/xml"); 
    urlConn.setRequestProperty("Authorization", "Basic "+ Client.getPassword());
    urlConn.setUseCaches(false);
    urlConn.setDoInput(true);
    urlConn.setDoOutput(true);
    urlConn.setFollowRedirects(false);
    urlConn.setRequestProperty("Slug", "Connectiontest/test.xls"); 
    String write = readFile(test.xls);
    urlConn.setRequestProperty("Content-Length","" + write.length());
    urlConn.getOutputStream().write(write.getBytes("UTF8"));

In my optinion there are 2 ways to solve this problem.

1. change the output at .write(write.getBytes(“UTF8”))
2. change the intput

At the moment I read the files like this:

    readFile(String test){
    BufferedReader reader = new BufferedReader(new FileReader(test));
    String line = null;
    StringBuilder stringBuilder = new StringBuilder();
    String ls = System.getProperty("line.separator");

    while ((line = reader.readLine()) != null) {
        stringBuilder.append(line);
        stringBuilder.append(ls);
    }
    reader.close();
    return stringBuilder.toString();
    }

I tried to change the RequestProperty() in this ways:

connection.setRequestProperty("content-type", "multipart/form-data");

or

connection.setRequestProperty("content-type", "application/vnd.ms-excel");

Do somebody know to Upload a .xls file like this? I have to prefere the HttpURLConnector, my boss said. :/

Thanks a lot!

Answer 1

Don’t treat the Excel file as a String. Change readFile to read the file into a byte[] instead, then write that to the connection output stream.