我创建了一个小型应用程序，它将音频文件从 android 发送到 servlet，但出现连接错误。以下是我的完整代码。请审查它。
客户端代码
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.MediaStore;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
private static final int SELECT_AUDIO = 2;
String selectedPath = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
openGalleryAudio();
}
/*
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
*/
public void openGalleryAudio(){
Intent intent = new Intent();
intent.setType("audio/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,"Select Audio "), SELECT_AUDIO);
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_AUDIO)
{
System.out.println("SELECT_AUDIO");
Uri selectedImageUri = data.getData();
selectedPath = getPath(selectedImageUri);
System.out.println("SELECT_AUDIO Path : " + selectedPath);
new FileTrans().execute("");
}
}
}
public String getPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, projection, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
private class FileTrans extends AsyncTask<String, Void, String>
{
@Override
protected String doInBackground(String... arg0) {
HttpURLConnection conn = null;
DataOutputStream dos = null;
DataInputStream inStream = null;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 4*1024*1024;
String responseFromServer = "";
String urlString = "http://10.0.2.2:8080/FileUpload/FUServlet";
try
{
FileInputStream fileInputStream = new FileInputStream(new File(selectedPath) );
// open a URL connection to the Servlet
URL url = new URL(urlString);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(7000);
// Allow Inputs
conn.setDoInput(true);
// Allow Outputs
conn.setDoOutput(true);
// Don't use a cached copy.
conn.setUseCaches(false);
// Use a post method.
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);
dos = new DataOutputStream( conn.getOutputStream() );
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + selectedPath + "\"" + lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form...
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0)
{
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
// send multipart form data necesssary after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// close streams
Log.e("Debug","File is written");
fileInputStream.close();
dos.flush();
dos.close();
}
catch (MalformedURLException ex)
{
Log.e("Debug", "error: " + ex.getMessage(), ex);
}
catch (IOException ioe)
{
Log.e("Debug", "error: " + ioe.getMessage(), ioe);
}
//------------------ read the SERVER RESPONSE
try {
inStream = new DataInputStream ( conn.getInputStream() );
String str;
while (( str = inStream.readLine()) != null)
{
Log.e("Debug","Server Response "+str);
}
inStream.close();
}
catch (IOException ioex){
Log.e("Debug", "error: " + ioex.getMessage(), ioex);
}
return null;
}
@Override
protected void onPostExecute(String result) {
}
@Override
protected void onPreExecute() {
}
@Override
protected void onProgressUpdate(Void... values) {
}
}
}
这是我的 servlet 代码
public class FUServlet extends HttpServlet {
private boolean isMultipart;
private String filePath;
private int maxFileSize = 9000 * 1024;
private int maxMemSize = 6 * 1024;
private File file ;
public void init( ){
// Get the file location where it would be stored.
filePath =
getServletContext().getInitParameter("file-upload");
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, java.io.IOException {
// Check that we have a file upload request
isMultipart = ServletFileUpload.isMultipartContent(request);
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter( );
if( !isMultipart ){
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet upload</title>");
out.println("</head>");
out.println("<body>");
out.println("<p>No file uploaded</p>");
out.println("</body>");
out.println("</html>");
return;
}
DiskFileItemFactory factory = new DiskFileItemFactory();
// maximum size that will be stored in memory
factory.setSizeThreshold(maxMemSize);
// Location to save data that is larger than maxMemSize.
factory.setRepository(new File("D:\\temp"));
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// maximum file size to be uploaded.
upload.setSizeMax( maxFileSize );
try{
// Parse the request to get file items.
List fileItems = upload.parseRequest(request);
// Process the uploaded file items
Iterator i = fileItems.iterator();
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet upload</title>");
out.println("</head>");
out.println("<body>");
while ( i.hasNext () )
{
FileItem fi = (FileItem)i.next();
if ( !fi.isFormField () )
{
// Get the uploaded file parameters
String fieldName = fi.getFieldName();
String fileName = fi.getName();
String contentType = fi.getContentType();
boolean isInMemory = fi.isInMemory();
long sizeInBytes = fi.getSize();
// Write the file
if( fileName.lastIndexOf("\\") >= 0 ){
file = new File( filePath +
fileName.substring( fileName.lastIndexOf("\\"))) ;
}else{
file = new File( filePath +
fileName.substring(fileName.lastIndexOf("\\")+1)) ;
}
fi.write( file ) ;
out.println("Uploaded Filename: " + fileName + "<br>");
}
}
out.println("</body>");
out.println("</html>");
}catch(Exception ex) {
System.out.println(ex);
}
}
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, java.io.IOException {
throw new ServletException("GET method used with " +
getClass( ).getName( )+": POST method required.");
}
}
我已经在我的清单文件中包含了所有必要的权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
我仍然收到错误任何人都可以帮助我。
这是我的日志猫
01-28 17:10:45.627: E/Debug(30428): error: failed to connect to /10.0.2.2 (port 8080) after 7000ms
01-28 17:10:45.627: E/Debug(30428): java.net.SocketTimeoutException: failed to connect to /10.0.2.2 (port 8080) after 7000ms
01-28 17:10:45.627: E/Debug(30428): at libcore.io.IoBridge.connectErrno(IoBridge.java:176)
01-28 17:10:45.627: E/Debug(30428): at libcore.io.IoBridge.connect(IoBridge.java:112)
01-28 17:10:45.627: E/Debug(30428): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
01-28 17:10:45.627: E/Debug(30428): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
01-28 17:10:45.627: E/Debug(30428): at java.net.Socket.connect(Socket.java:857)
01-28 17:10:45.627: E/Debug(30428): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:76)
01-28 17:10:45.627: E/Debug(30428): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
01-28 17:10:45.627: E/Debug(30428): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
01-28 17:10:45.627: E/Debug(30428): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
01-28 17:10:45.627: E/Debug(30428): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
01-28 17:10:45.627: E/Debug(30428): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
01-28 17:10:45.627: E/Debug(30428): at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
01-28 17:10:45.627: E/Debug(30428): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
01-28 17:10:45.627: E/Debug(30428): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
01-28 17:10:45.627: E/Debug(30428): at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:81)
01-28 17:10:45.627: E/Debug(30428): at libcore.net.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:205)
01-28 17:10:45.627: E/Debug(30428): at com.android.fileupload.MainActivity$FileTrans.doInBackground(MainActivity.java:110)