英文:
How to send audio file to server via POST request in Java (Android App)?
问题
我想在我的Java Android应用中通过POST请求将音频文件发送到服务器。以下是我目前的代码，但是它无法正常工作。我找到了这个实现了MultiPart Utility的类：public class MultipartUtility {private static final String LINE_FEED = "\r\n";private HttpURLConnection httpConn;private String charset;private OutputStream outputStream;private PrintWriter writer;private final String boundary;// ...（省略部分代码）...public List<String> finish() throws IOException {List<String> response = new ArrayList<String>();writer.append(LINE_FEED).flush();writer.append("--" + boundary + "--").append(LINE_FEED);writer.close();// 首先检查服务器的状态代码int status = httpConn.getResponseCode();if (status == HttpURLConnection.HTTP_OK) {BufferedReader reader = new BufferedReader(new InputStreamReader(httpConn.getInputStream()));String line = null;while ((line = reader.readLine()) != null) {response.add(line);}reader.close();httpConn.disconnect();} else {throw new IOException("Server returned non-OK status: " + status);}return response;}}想要使用以下客户端代码向服务器发送POST请求：String requestURL = "http://0.0.0.0:5000/test";try {com.eng.elfarsisy.recored.MultipartUtility multipart = new com.eng.elfarsisy.recored.MultipartUtility(requestURL, charset);multipart.addHeaderField("User-Agent", "CodeJava");multipart.addHeaderField("Test-Header", "Header-Value");multipart.addFormField("description", "Cool Pictures");multipart.addFormField("keywords", "Java,upload,Spring");multipart.addFilePart("fileUpload", uploadFile1);List<String> response = multipart.finish();System.out.println("SERVER REPLIED:");for (String line : response) {System.out.println(line);}} catch (IOException ex) {System.err.println(ex);}但是我得到了以下响应：`I/System.out: (HTTPLog)-Static: isSBSettingEnabled false``I/System.out: (HTTPLog)-Static: isSBSettingEnabled false``W/System.err: java.net.SocketException: Permission denied`如何修复这个问题？任何想法将不胜感激。
英文:
I want to send an audio file to a server via a POST request in my Java Android App. The following code is what I currently have, however, it is not working.
I have found this class implementing a MultiPart Utility:
public class MultipartUtility {private static final String LINE_FEED = "\r\n";private HttpURLConnection httpConn;private String charset;private OutputStream outputStream;private PrintWriter writer;private final String boundary;public MultipartUtility(String requestURL, String charset)throws IOException {this.charset = charset;// creates a unique boundary based on time stampboundary = "===" + System.currentTimeMillis() + "===";URL url = new URL(requestURL);httpConn = (HttpURLConnection) url.openConnection();httpConn.setUseCaches(false);httpConn.setDoOutput(true); // indicates POST methodhttpConn.setDoInput(true);httpConn.setRequestProperty("Content-Type","multipart/form-data; boundary=" + boundary);httpConn.setRequestProperty("User-Agent", "CodeJava Agent");httpConn.setRequestProperty("Test", "Bonjour");outputStream = httpConn.getOutputStream();writer = new PrintWriter(new OutputStreamWriter(outputStream, charset),true);}public void addFormField(String name, String value) {writer.append("--" + boundary).append(LINE_FEED);writer.append("Content-Disposition: form-data; name=\"" + name + "\"").append(LINE_FEED);writer.append("Content-Type: text/plain; charset=" + charset).append(LINE_FEED);writer.append(LINE_FEED);writer.append(value).append(LINE_FEED);writer.flush();}public void addFilePart(String fieldName, File uploadFile)throws IOException {String fileName = uploadFile.getName();writer.append("--" + boundary).append(LINE_FEED);writer.append("Content-Disposition: form-data; name=\"" + fieldName+ "\"; filename=\"" + fileName + "\"").append(LINE_FEED);writer.append("Content-Type: "+ URLConnection.guessContentTypeFromName(fileName)).append(LINE_FEED);writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED);writer.append(LINE_FEED);writer.flush();FileInputStream inputStream = new FileInputStream(uploadFile);byte[] buffer = new byte[4096];int bytesRead = -1;while ((bytesRead = inputStream.read(buffer)) != -1) {outputStream.write(buffer, 0, bytesRead);}outputStream.flush();inputStream.close();writer.append(LINE_FEED);writer.flush();}public void addHeaderField(String name, String value) {writer.append(name + ": " + value).append(LINE_FEED);writer.flush();}public List<String> finish() throws IOException {List<String> response = new ArrayList<String>();writer.append(LINE_FEED).flush();writer.append("--" + boundary + "--").append(LINE_FEED);writer.close();// checks server's status code firstint status = httpConn.getResponseCode();if (status == HttpURLConnection.HTTP_OK) {BufferedReader reader = new BufferedReader(new InputStreamReader(httpConn.getInputStream()));String line = null;while ((line = reader.readLine()) != null) {response.add(line);}reader.close();httpConn.disconnect();} else {throw new IOException("Server returned non-OK status: " + status);}return response;}}
and want to send a POST request to a server with this client code:
String requestURL = "http://0.0.0.0:5000/test";try {com.eng.elfarsisy.recored.MultipartUtility multipart = new com.eng.elfarsisy.recored.MultipartUtility(requestURL, charset);multipart.addHeaderField("User-Agent", "CodeJava");multipart.addHeaderField("Test-Header", "Header-Value");multipart.addFormField("description", "Cool Pictures");multipart.addFormField("keywords", "Java,upload,Spring");multipart.addFilePart("fileUpload", uploadFile1);List<String> response = multipart.finish();System.out.println("SERVER REPLIED:");for (String line : response) {System.out.println(line);}} catch (IOException ex) {System.err.println(ex);}
However I am getting this response:
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
W/System.err: java.net.SocketException: Permission denied
How can I fix this? Any ideas would be greatly appreciated.
答案1
得分: 0
你是否已将此权限添加到清单文件中？
<uses-permission android:name="android.permission.INTERNET"/>
英文:
Have you added this permission to your manifest?
<uses-permission android:name="android.permission.INTERNET"/>
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