如何在android中解決Java.Io.IoException

Question

我正在嘗試使用post方法和參數調用php web服務，但是我在OutputStreamWriter處遇到異常wr = new OutputStreamWriter（conn.getOutputStream（））; 這行代碼，我已經通過調試注意到了，我已經搜索了此錯誤，但沒有找到任何適當的解決方案，有人可以幫助我解決此錯誤嗎？ 提前致謝。

String data = URLEncoder.encode("name", "UTF-8")
                + "=" + URLEncoder.encode("wsd", "UTF-8");

        data += "&" + URLEncoder.encode("email", "UTF-8") + "="
                + URLEncoder.encode("asd", "UTF-8");

        data += "&" + URLEncoder.encode("user", "UTF-8")
                + "=" + URLEncoder.encode("asd", "UTF-8");

        data += "&" + URLEncoder.encode("pass", "UTF-8")
                + "=" + URLEncoder.encode("sad", "UTF-8");

        String text = "";
        BufferedReader reader=null;
        try
        {

            // Defined URL  where to send data
            URL url = new URL("http://androidexample.com/media/webservice/httppost.php");

            // Send POST data request

            URLConnection conn = url.openConnection();
            conn.setDoOutput(true);
            OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
            wr.write( data );
            wr.flush();

            // Get the server response

            reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            StringBuilder sb = new StringBuilder();
            String line = null;

            // Read Server Response
            while((line = reader.readLine()) != null)
            {
                // Append server response in string
                sb.append(line + "\n");
            }


            text = sb.toString();
        }
        catch(Exception ex)
        {

        }
        finally
        {
            try
            {

                reader.close();
            }

            catch(Exception ex) {}
        }

        // Show response on activity
        //content.setText( text  );

    return text;
    }

Answer 1

在發送參數時，請嘗試以下操作：

OutputStream output = new BufferedOutputStream(urlConnection.getOutputStream());
output.write(param.getBytes());
output.flush();
output.close();