我在PC和手机之间写了一个服务器 - 客户端通信。 PC是用Python编写的服务器，方便的是用Android（Java）编写的客户端。
注册后，双方都会发送他们的名字，一些JSON-String正在从手机发送到PC。 这没有任何例外。
但是，当我在检查传入数据后尝试接收服务器应答时，出现以下异常：
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@30ad25c
time:69321819
D/ViewRootImpl: ViewPostImeInputStage ACTION_DOWN
W/System.err: java.net.SocketException: Socket is closed
W/System.err: at java.net.PlainSocketImpl.checkNotClosed(PlainSocketImpl.java:116)
W/System.err: at java.net.PlainSocketImpl.getInputStream(PlainSocketImpl.java:213)
W/System.err: at java.net.Socket.getInputStream(Socket.java:363)
W/System.err: at com.dmd_data.soft_zeiterfassung.daten_transfer$MyClientTask.doInBackground(daten_transfer.java:267)
W/System.err: at com.dmd_data.soft_zeiterfassung.daten_transfer$MyClientTask.doInBackground(daten_transfer.java:108)
W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:288)
W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
W/System.err: at java.lang.Thread.run(Thread.java:818)
I/Timeline: Timeline: Activity_launch_request id:com.dmd_data.soft_zeiterfassung time:69322601
D/Activity: performCreate Call secproduct feature valuefalse
D/Activity: performCreate Call debug elastic valuetrue
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@30ad25c time:69323717
我的Android代码如下所示：
public class MyClientTask extends AsyncTask<Void, Void, Void> {
String dstAddress;
int dstPort;
String message = "";
String response = "";
String failMessage = "";
int timeoutMs;
String kontoVorname;
String kontoNachname;
String userName;
MyClientTask(String addr){
dstAddress = addr;
dstPort = 9090;
timeoutMs = 1000;
SharedPreferences systemDATA = getSharedPreferences("konto",0);
kontoVorname = systemDATA.getString("editText_vorname", "");
kontoNachname = systemDATA.getString("editText_nachname", "");
userName = kontoVorname+" "+kontoNachname;
}
@Override
protected Void doInBackground(Void... arg0) {
JSONArray arb_List = new JSONArray();
JSONArray mat_List = new JSONArray();
Cursor arb_Cursor = My_Database.getAllData();
if (arb_Cursor.getCount() == 0){
Intent click_datenbank = new Intent(daten_transfer.this,pop_datenbank.class);
startActivity(click_datenbank);
}else {
Socket socket = null;
try {
SocketAddress sock_addresse = new InetSocketAddress(dstAddress, dstPort);
socket = new Socket();
socket.connect(sock_addresse, timeoutMs);
} catch (UnknownHostException e) {
e.printStackTrace();
failMessage = "IP-ADRESSE UNBEKANNT:\n" + e.toString();
} catch (IOException e) {
e.printStackTrace();
failMessage = "PC NICHT ERREICHBAR:\n"+ e.toString();
}
SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yyyy, HH:mm");
String dateTime = sdf.format(new Date());
//Receive server name
ByteArrayOutputStream bAPS_Name = new ByteArrayOutputStream(25000);
byte[] bytes_Name = new byte[25000];
int int_server;
InputStream input_Name = null;
try {
input_Name = socket.getInputStream();
int_server = input_Name.read(bytes_Name);
bAPS_Name.write(bytes_Name, 0, int_server);
response += bAPS_Name.toString("UTF-8");
} catch (IOException e) {
e.printStackTrace();
}
//Create datalist
arb_Cursor.moveToFirst();
while (arb_Cursor.isAfterLast() == false) {
int totalArbeit = arb_Cursor.getColumnCount();
JSONObject row_SEND = new JSONObject();
for( int i=0 ; i< totalArbeit ; i++ ){
if( arb_Cursor.getColumnName(i) != null ){
try{
if( arb_Cursor.getString(i) != null ){
row_SEND.put(arb_Cursor.getColumnName(i) , arb_Cursor.getString(i) );
}
else
{
row_SEND.put( "NONE" , "---" );
}
}
catch( Exception e )
{
e.getMessage();
failMessage = "SORRY,SOMETHING GOES WRONG:\n" + e.toString();
}
}
}
arb_List.put(row_SEND);
arb_Cursor.moveToNext();
}
arb_Cursor.close();
//Send
JSONObject json = new JSONObject();
try (OutputStreamWriter writer = new OutputStreamWriter(socket.getOutputStream(), StandardCharsets.UTF_8)){
json.put("User",userName);
json.put("Datetime",dateTime);
json.put("Datalist",arb_List);
writer.write(json.toString());
} catch (Exception e) {
e.printStackTrace();
failMessage = "SORRY, SOMETHING GOES WRONG...:\n" + e.toString();
}
// Until here it works
//##################################################################################
InputStream input_Response = null;
try {
input_Response = socket.getInputStream();
BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(input_Response));
String line = "";
while((line = bufferedReader.readLine()) != null) {
message += line;
}
} catch (IOException e) {
e.printStackTrace();
}
//##################################################################################
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (failMessage.length()!= 0){
Toast.makeText(daten_transfer.this,failMessage,Toast.LENGTH_LONG).show();
//Intent click_transfer = new Intent(daten_transfer.this,pop_wlan.class);
//startActivity(click_transfer);
}
else{
SharedPreferences systemDATA = getSharedPreferences("konto",0);
SharedPreferences.Editor editor = systemDATA.edit();
//editor.putString("failmessage",failMessage);
//editor.commit();
editor.putString("response",response);
editor.commit();
if (response.length() != 0){
Intent click_transfer = new Intent(daten_transfer.this,pop_tansfer.class);
startActivity(click_transfer);
}
textView_show.setText(message);
}
}
}
我尽我所能尝试了一切，但不管我做什么，我总能得到答案：
java.net.SocketException: Socket is closed
答案 0 :(得分：0)
完成out流式传输后，关闭OutputStreamWriter writer变量。套接字正忙，因为您仍在使用它。 请尝试以下代码段
json.put("User",userName);
json.put("Datetime",dateTime);
json.put("Datalist",arb_List);
writer.write(json.toString());
writer.close();
使用后关闭套接字也是一种很好的做法。