此刻我正在编写一个套接字客户端。
在套接字上写完全正常。
但是当我尝试使用BufferedReader读取数据时，它将挂起。
有时它可以工作，但是大多数套接字被（设备？）破坏了。
（我只在服务器端看到此信息：+ WIND：62：Socket客户端消失：172.20.237.2，这意味着客户端不见了/关闭了套接字）
我尝试过：
- first i used readNewLine, it worked but slowly so i tought this was
blocking.
- then i tried Char by Char but this is also blocking at: br.read i think.
- i tried to set Socket Timeot to 100000 e.g.
- i changed port (80,3067, now 6660)
我不知道为什么它从Wifi模块（带有Socketlistener）到Android手机的连接如此之慢。
在此示例中，我使用char“！”让我的客户知道字符串何时结尾。
也许是另一个问题... 我希望有人能帮助我。
这是我的读写代码：
@Override
protected String doInBackground(String... params) //was strings
{
ip = params[0];
message = params[1];
port = params[2];
try
{
s = new Socket(ip,Integer.parseInt(port));
s.setSoTimeout(100000);
if (s.isConnected())
{
dos = new DataOutputStream(s.getOutputStream());
dos.writeBytes(message);
dos.flush();
is = s.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
//StringBuffer buffer = new StringBuffer();
// or of course StringBuffer if you need to be treadsafe
StringBuilder messageBuffer = new StringBuilder();
// reads to the end of the stream or till end of message
while((value = br.read()) != -1) {
char c = (char)value;
// end? jump out
if (c == endMarker) {
break;
}
// else, add to buffer
messageBuffer.append(c);
}
// message is complete!
response = messageBuffer.toString();
/*
BufferedReader br = new BufferedReader(new
InputStreamReader(s.getInputStream()));
response = br.readLine();
*/
}
//dos.writeUTF(message);
//br.close();
dos.close();
s.close();
}
catch (IOException e)
{
e.printStackTrace();
}
return response;
}
我看到客户端消失后的LogCat：
我不知道这是引起问题还是在发生之后：
java.lang.NumberFormatException：s == null
2018-11-20 15:34:44.921 3787-3920/? D/SemContextService:
Service.updateContext() : service = Step Level Monitor
2018-11-20 15:34:44.924 22956-23045/? I/Sensor[0x06]: [0x01] 33
2018-11-20 15:34:44.925 22956-23045/? I/Sensor[0x04]: [0x01]
1542724446610[0x02] 0[0x03] 2[0x04] 10012
2018-11-20 15:34:45.686 27406-27406/? D/gpsd: CALL_SENTRY(main()):
GlEngine::OnResourceRelease took 251 ms (from 143759612 to 143759863)
(logOverhead=0,0,0,0,0,0,0), start: 15:34:45.435
2018-11-20 15:34:45.937 27406-27406/? D/gpsd: CALL_SENTRY(main()):
GlEngine::OnResourceRequest took 251 ms (from 143759863 to 143760114)
(logOverhead=0,0,0,0,0,0,0), start: 15:34:45.686
2018-11-20 15:34:45.940 27406-27406/? D/gpsd: CALL_SENTRY(main()):
GlEngine::ChipData took 506 ms (from 143759611 to 143760117)
(logOverhead=0,0,0,0,0,0,0), start: 15:34:45.434
2018-11-20 15:34:45.941 27406-27406/? D/gpsd: CALL_SENTRY(main()):
ProcessEvent took 507 ms (from 143759611 to 143760118)
(logOverhead=0,0,0,0,0,0,0), start: 15:34:45.434
2018-11-20 15:34:46.161 3787-8916/? D/ConnectivityService:
filterNetworkStateForUid() uid: 1000 networkInfo: [type: WIFI[] - WIFI,
state: CONNECTED/CONNECTED, reason: (unspecified), extra: "SocketAppTest",
failover: false, available: true, roaming: false, metered: false]
2018-11-20 15:34:46.192 3408-6813/? V/APM_AudioPolicyManager:
getAudioPolicyConfig: audioParam;activeStream
2018-11-20 15:34:46.193 3408-6813/? V/APM_AudioPolicyManager: ### active
stream : 0
2018-11-20 15:34:46.194 3787-8916/? D/AudioService: active stream is 0x0
2018-11-20 15:34:46.196 3408-6813/? V/APM_AudioPolicyManager:
getAudioPolicyConfig: audioParam;outDevice
2018-11-20 15:34:46.196 3408-6813/? V/APM_AudioPolicyManager:
getNewOutputDevice() selected device 0
2018-11-20 15:34:46.197 3408-6813/? V/APM_AudioPolicyManager: ### curdevice
: 2
2018-11-20 15:34:46.202 3787-8916/? W/System.err:
java.lang.NumberFormatException: s == null
2018-11-20 15:34:46.202 3787-8916/? W/System.err: at
java.lang.Integer.parseInt(Integer.java:570)
2018-11-20 15:34:46.203 3787-8916/? W/System.err: at b.b.aF(:79)
2018-11-20 15:34:46.203 3787-8916/? W/System.err: at b.c.aN(:149)
2018-11-20 15:34:46.203 3787-8916/? W/System.err: at b.n.run(:72)
2018-11-20 15:34:46.203 3787-8916/? W/System.err: at
android.os.Handler.handleCallback(Handler.java:789)
2018-11-20 15:34:46.203 3787-8916/? W/System.err: at
android.os.Handler.dispatchMessage(Handler.java:98)
2018-11-20 15:34:46.203 3787-8916/? W/System.err: at
android.os.Looper.loop(Looper.java:164)
2018-11-20 15:34:46.203 3787-8916/? W/System.err: at
android.os.HandlerThread.run(HandlerThread.java:65)
2018-11-20 15:34:46.678 12232-12699/? D/ClClient: Not sending keepalive.
Current connection state=STOPPED
2018-11-20 15:34:46.699 3418-3639/? D/DnsProxyListener: DNSDBG::dns addrinfo
af 2
2018-11-20 15:34:47.611 3787-8916/? D/SSRM:w: SIOP:: AP = 340, PST = 340
(W:15), BAT = 313, USB = 318, CHG = 346, CP = 333
2018-11-20 15:34:48.087 4959-4959/? D/io_stats: !@ 8,0 r 5038254 276077112
w 1290028 18962328 d 122047 41066928 f 289127 307003 iot 2157260 1768288 th
307200 0 0 pt 0 inp 0 0 63174.392
2018-11-20 15:34:49.339 3787-3909/? D/SamsungAlarmManager: Expired : 4
2018-11-20 15:34:49.340 3787-3909/? I/SamsungAlarmManager: setLocked to
kernel - T:2 / 20181120T153509, SetElapsed=143783728, nowELAPSED=143763517
2018-11-20 15:34:49.341 3787-3909/? I/SamsungAlarmManager: setLocked to
kernel - T:3 / 20181120T153500, SetElapsed=143774177, nowELAPSED=143763518
2018-11-20 15:34:49.342 3787-3909/? V/SamsungAlarmManager: Sending to uid :
1000 listener=android.app.AlarmManager$ListenerWrapper@fa0b687
alarm=Alarm{5a2ea2f type 2 when 143763516 android}
2018-11-20 15:34:49.356 3787-4006/? D/SamsungAlarmManager: setExact Listener
(T:2/F:9/AC:false) 20181120T153525 - CU:1000/CP:3787
2018-11-20 15:34:49.501 13308-13308/? E/hw-IPCThreadState: binder thread
pool (1 threads) starved for 155 ms
2018-11-20 15:34:49.632 13308-13308/? E/hw-IPCThreadState: binder thread
pool (1 threads) starved for 129 ms
2018-11-20 15:34:49.649 3787-4015/? D/WifiP2pService: InactiveState143375
2018-11-20 15:34:49.650 3787-4015/? D/WifiP2pService: P2pEnabledState143375
2018-11-20 15:34:49.701 3787-6300/? D/SamsungAlarmManager: setExact Listener
(T:2/F:9/AC:false) 20181120T153450 - CU:1000/CP:3787
2018-11-20 15:34:49.702 3787-6300/? I/SamsungAlarmManager: setLocked to
kernel - T:2 / 20181120T153450, SetElapsed=143764875, nowELAPSED=143763879
2018-11-20 15:34:50.698 3787-3909/? D/SamsungAlarmManager: Expired : 4
2018-11-20 15:34:50.699 3787-3909/? I/SamsungAlarmManager: setLocked to
kernel - T:2 / 20181120T153509, SetElapsed=143783728, nowELAPSED=143764876
2018-11-20 15:34:50.700 3787-3909/? V/SamsungAlarmManager: Sending to uid :
1000 listener=android.app.AlarmManager$ListenerWrapper@44c69c5
alarm=Alarm{213f1a type 2 when 143764844 android}
2018-11-20 15:34:50.747 3787-6300/? D/SamsungAlarmManager: setExact Listener
(T:2/F:9/AC:false) 20181120T153452 - CU:1000/CP:3787
2018-11-20 15:34:50.747 3787-6300/? I/SamsungAlarmManager: setLocked to
kernel - T:2 / 20181120T153452, SetElapsed=143767063, nowELAPSED=143764924
2018-11-20 15:34:50.753 3787-6300/? D/DhcpClient: Renewed lease: IP address
172.20.237.2/24 Gateway 172.20.237.1 DNS servers: [ 172.20.237.1 ] Domains
DHCP server /172.20.237.1 Vendor info null lease 240 seconds
2018-11-20 15:34:50.754 3787-6300/? D/SamsungAlarmManager: Cancel Alarm
calling from uid:1000 pid :3787 /
listener:android.app.AlarmManager$ListenerWrapper@77dfa4b
2018-11-20 15:34:50.754 3787-4006/? D/SamsungAlarmManager: Cancel Alarm
calling from uid:1000 pid :3787 /
listener:android.app.AlarmManager$ListenerWrapper@912383c
2018-11-20 15:34:50.758 3787-6300/? I/SamsungAlarmManager: setLocked to
kernel - T:2 / 20181120T153500, SetElapsed=143774177, nowELAPSED=143764935
2018-11-20 15:34:50.769 3787-4015/? D/WifiP2pService: InactiveState143375
2018-11-20 15:34:50.769 3787-6300/? D/SamsungAlarmManager: setExact Listener
(T:2/F:9/AC:false) 20181120T153645 - CU:1000/CP:3787
2018-11-20 15:34:50.770 3787-4015/? D/WifiP2pService: P2pEnabledState143375
我也刚刚在LogCat中找到了这个：（也许是问题所在？）
2018-11-20 16:01:01.546 3384-3384/? E/audit: type=1400
audit(1542726061.545:3227): avc: denied { read } for pid=16998
comm="Analytics-Norma" name="boot_id" dev="proc" ino=3571102
scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:proc:s0
tclass=file permissive=0 SEPF_SM-G955F_8.0.0_0017 audit_filtered
2018-11-20 16:01:01.549 16998-17153/? E/msgr.BootIdReader: Error reading
boot_id from procfs
java.io.FileNotFoundException: /proc/sys/kernel/random/boot_id (Permission
denied)
at java.io.FileInputStream.open0(Native Method)
at java.io.FileInputStream.open(FileInputStream.java:200)
at java.io.FileInputStream.<init>(FileInputStream.java:150)
at java.io.FileInputStream.<init>(FileInputStream.java:103)
at java.io.FileReader.<init>(FileReader.java:58)
at X.2MN.a(:372675)
at X.46q.a(:579709)
at X.0Hi.A(Unknown Source:26)
at X.0IH.a(:60614)
at X.0IH.b(:60638)
at X.41k.a(:569612)
at X.1y8.a(:339223)
at X.1rz.a(:330137)
at X.0dC.a(:118033)
at X.0d9.a(:117958)
at X.0fP.d(:123017)
at X.0fP.c(:122985)
at X.0fP.handleMessage(:123035)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.os.HandlerThread.run(HandlerThread.java:65)
2018-11-20 16:01:02.739 16656-16708/? E/Fabric: Settings request failed.
+...
2018-11-20 16:04:25.446 16779-16855/? E/BtGatt.GattService: [GSIM LOG]:
gsimLogHandler, msg: MESSAGE_SCAN_STOP, appName: com.enbw.ev, scannerId: 7,
reportDelayMillis=0
2018-11-20 16:04:25.472 4777-5949/? E/ExecutionCriteria: Package unavailable
for task: com.tumblr/com.firebase.jobdispatcher.GooglePlayReceiver{u=0
tag="retryServiceTag"
trigger=window{start=3429s,end=3610s,earliest=-3609249s,latest=-3609069s}
requirements=[NET_ANY] attributes=[PERSISTED,RECURRING] scheduled=-3612679s
last_run=N/A jid=N/A status=PENDING retries=0
client_lib=FIREBASE_JOB_DISPATCHER-1}
2018-11-20 16:04:36.402 3787-4392/? E/Watchdog: !@Sync 2164 [2018-11-20
16:04:36.402]
2018-11-20 16:04:39.119 5626-5793/? E/ContactsProvider_EventLog: Flush
buffer to file cnt : 1 size : 1Kb duration : 2ms lastUpdatedAfter : 60132 ms
mFlush_time_threasold : 2000 mCurrentSize : 800
2018-11-20 16:04:55.481 4777-5949/? E/ExecutionCriteria: Package unavailable
for task: com.tumblr/com.firebase.jobdispatcher.GooglePlayReceiver{u=0
tag="retryServiceTag"
trigger=window{start=3429s,end=3610s,earliest=-3609279s,latest=-3609099s}
requirements=[NET_ANY] attributes=[PERSISTED,RECURRING] scheduled=-3612709s
last_run=N/A jid=N/A status=PENDING retries=0
client_lib=FIREBASE_JOB_DISPATCHER-1}
2018-11-20 16:04:55.551 16779-16855/? E/BtGatt.GattService: [GSIM LOG]:
gsimLogHandler, msg: MESSAGE_SCAN_START, appName: com.enbw.ev, scannerId: 7,
reportDelayMillis=0
2018-11-20 16:05:00.596 16779-16855/? E/BtGatt.GattService: [GSIM LOG]:
gsimLogHandler, msg: MESSAGE_SCAN_STOP, appName: com.enbw.ev, scannerId: 7,
reportDelayMillis=0