我正在使用此代码打开与服务器的连接：
public static String executeHttpPost(String url, ArrayList<NameValuePair> postParameters) throws Exception {
BufferedReader in = null;
try{
HttpClient client = getHttpClient();
HttpPost request = new HttpPost(url);
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(postParameters);
request.setEntity(formEntity);
HttpResponse response = client.execute(request); //The Exception is thrown here
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null) {
sb.append(line + NL);
}
in.close();
String result = sb.toString();
return result;
}finally{
if (in!=null){
try{
in.close();
}catch(IOException e){
e.printStackTrace();
}
}
}
}
发送照片的方法是这样的：
private void enviarImagen(final byte[] byteArray) {
try {
Thread thread=new Thread(){
public void run(){
try{
params.add(new BasicNameValuePair("data", Base64.encodeToString(byteArray, Base64.NO_WRAP)));
params.add(new BasicNameValuePair("azafata",General.getUsuario()));
params.add(new BasicNameValuePair("caption", filename));
params.add(new BasicNameValuePair("id", String.valueOf(id)));
CustomHttpClient.executeHttpPost(urlsendfoto, params);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
AlertDialog.Builder alert = new AlertDialog.Builder(GpsActivity.this);
alert.setTitle(R.string.fotografias);
alert.setMessage(R.string.fotomal);
alert.setPositiveButton(R.string.accept,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
//Éste intent abre la configuración de geolocalización.
startActivity(new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
}
});
alert.setNegativeButton(R.string.cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
}
});
alert.show();
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
thread.start();
}finally{
}
}
我第一次发送照片时，效果很好。但是，当我拍摄第二个时，它会引发异常：
05-24 11:22:56.251: W/System.err(11931): java.net.SocketException: Socket closed
05-24 11:22:56.251: W/System.err(11931): at org.apache.harmony.luni.platform.OSNetworkSystem.read(Native Method)
05-24 11:22:56.259: W/System.err(11931): at dalvik.system.BlockGuard$WrappedNetworkSystem.read(BlockGuard.java:273)
05-24 11:22:56.259: W/System.err(11931): at org.apache.harmony.luni.net.PlainSocketImpl.read(PlainSocketImpl.java:458)
05-24 11:22:56.259: W/System.err(11931): at org.apache.harmony.luni.net.SocketInputStream.read(SocketInputStream.java:85)
05-24 11:22:56.259: W/System.err(11931): at org.apache.http.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:103)
05-24 11:22:56.259: W/System.err(11931): at org.apache.http.impl.io.AbstractSessionInputBuffer.readLine(AbstractSessionInputBuffer.java:191)
05-24 11:22:56.267: W/System.err(11931): at org.apache.http.impl.conn.DefaultResponseParser.parseHead(DefaultResponseParser.java:82)
05-24 11:22:56.267: W/System.err(11931): at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:174)
05-24 11:22:56.267: W/System.err(11931): at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:179)
05-24 11:22:56.275: W/System.err(11931): at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:235)
05-24 11:22:56.275: W/System.err(11931): at org.apache.http.impl.conn.AbstractClientConnAdapter.receiveResponseHeader(AbstractClientConnAdapter.java:259)
05-24 11:22:56.275: W/System.err(11931): at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:279)
05-24 11:22:56.275: W/System.err(11931): at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:121)
05-24 11:22:56.282: W/System.err(11931): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:421)
05-24 11:22:56.282: W/System.err(11931): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
05-24 11:22:56.282: W/System.err(11931): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
05-24 11:22:56.282: W/System.err(11931): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
05-24 11:22:56.290: W/System.err(11931): at com.publidirecta.vinceriazafata.CustomHttpClient.executeHttpPost(CustomHttpClient.java:45)
05-24 11:22:56.290: W/System.err(11931): at com.publidirecta.vinceriazafata.GpsActivity$9.run(GpsActivity.java:301)
如何修复此错误？更重要的是……为什么会发生？
谢谢你。