如何将文件从客户端android传输到java Web服务器

Question

我想从我的Android应用程序发送文件中的一些数据，并将该文件保存在java Web服务器中 服务器页面永远不会收到任何数据，有人知道出了什么问题吗？

下面是我的客户端（android）和我的服务器（Java和Tomcat）。

客户端

HttpURLConnection connection = null;
DataOutputStream outputStream = null;
DataInputStream inputStream = null;
String pathToOurFile = "coleta.txt";
String urlServer = "http://192.168.2.219:8080/servidor_leite/produtores.jsp";
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
FileInputStream fileInputStream;
try {
    fileInputStream = new FileInputStream(getFileStreamPath(pathToOurFile));
    URL url = new URL(urlServer);
    connection = (HttpURLConnection) url.openConnection();
    // Allow Inputs & Outputs
    connection.setDoInput(true);
    connection.setDoOutput(true);
    connection.setUseCaches(false);
    // Enable POST method
    connection.setRequestMethod("POST");
    connection.setRequestProperty("Connection", "Keep-Alive");
    connection.setRequestProperty("Content-Type",
        "multipart/form-data;boundary=" + boundary);
    outputStream = new DataOutputStream(connection.getOutputStream());
    outputStream.writeBytes(twoHyphens + boundary + lineEnd);
    outputStream.writeBytes("Content-Disposition: form-data;"
        + " name=\"uploadedfile\";filename=\""+ pathToOurFile + "\"" + lineEnd);
    outputStream.writeBytes(lineEnd);
    bytesAvailable = fileInputStream.available();
    bufferSize = Math.min(bytesAvailable, maxBufferSize);
    buffer = new byte[bufferSize];
    // Read file
    bytesRead = fileInputStream.read(buffer, 0, bufferSize);
    while (bytesRead > 0) {
        outputStream.write(buffer, 0, bufferSize);
        bytesAvailable = fileInputStream.available();
        bufferSize = Math.min(bytesAvailable, maxBufferSize);
        bytesRead = fileInputStream.read(buffer, 0, bufferSize);
    }
    outputStream.writeBytes(lineEnd);
    outputStream.writeBytes(twoHyphens + boundary + twoHyphens
        + lineEnd);
    // Responses from the server (code and message)
    int serverResponseCode = connection.getResponseCode();
    String serverResponseMessage = connection.getResponseMessage();
    fileInputStream.close();
    outputStream.flush();
    outputStream.close();
}

Web服务器

ServletInputStream sis = request.getInputStream();
BufferedReader in = new BufferedReader(new InputStreamReader(sis));
String postData = new String();
while (in.ready()) {
    postData += in.readLine();
}
try {
    FileWriter fstream = new FileWriter(getServletContext()
            .getRealPath("produtores.txt"));
    PrintWriter writer = new PrintWriter(fstream);
    writer.println("Bytes available '" + sis.available() + "'<br/>");
    writer.println("in.ready() is '" + in.ready() + "'<br/>");
    writer.println(postData);
    // Close the output stream
    writer.close();
}