java - 无法使用 HttpPost 上传文档

Question

我正在尝试使用以下代码将文档从我的本地计算机上传到 Http，但我收到 HTTP 400 Bad request 错误。我的源数据在 Json 中。

URL url = null;
boolean success = false;

try {
        FileInputStream fstream;
        @SuppressWarnings("resource")
        BufferedReader bufferedReader = new BufferedReader(new FileReader("C:\\Users\\Desktop\\test.txt"));
        StringBuffer buffer = new StringBuffer();
        String line = null;

        while ((line = bufferedReader.readLine()) != null) {
            buffer.append(line);
        }

        String request = "http://example.com";
        URL url1 = new URL(request);
        HttpURLConnection connection = (HttpURLConnection) url1.openConnection();
        connection.setDoOutput(true); // want to send
        connection.setRequestMethod("POST");
        connection.setAllowUserInteraction(false); // no user interaction
        connection.setRequestProperty("Content-Type", "application/json");


        DataOutputStream wr = new DataOutputStream(
        connection.getOutputStream());
        wr.flush();
        wr.close();
        connection.disconnect();


        System.out.println(connection.getHeaderFields().toString());

        // System.out.println(response.toString());
} catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
} catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
}

Answer 1

查看 apache http 库，这将对此有很大帮助:

File file = new File("path/to/your/file.txt");
try {
         HttpClient client = new DefaultHttpClient();  
         String postURL = "http://someposturl.com";
         HttpPost post = new HttpPost(postURL); 
         FileBody bin = new FileBody(file);
         MultipartEntity reqEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);  
         reqEntity.addPart("myFile", bin);
         post.setEntity(reqEntity);  
         HttpResponse response = client.execute(post);  
         HttpEntity resEntity = response.getEntity();  

         if (resEntity != null) {    
               Log.i("RESPONSE",EntityUtils.toString(resEntity));
         }

} catch (Exception e) {
    e.printStackTrace();
}

上面的例子取 self 的blog它应该可以与标准的 Java SE 和 Android 一起使用。