In the telecommunication network management system, the real-time display of the equipment status information is very important, usually mount a bunch of icons to display the status or alarm information, the limited information of the icons, sometimes need more detailed panels, even in the form of a chart, this article will combine the needs of recent customers,
Android phones also support WiFi and 3G, determine the network connection, determine the network type (WiFi or 3G).Permissions:uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />Determine network connectivity /** * 判断网络是否可用, 在使用网络请求是预先使用此方法进行检查, 以节省资源. * * @return 可用状态 */ publicstaticbooleanisNetAvailable() { Con
As we all know, when developing an APP that involves network connections, we all want to determine the current network connection status in advance. If there is no network, we will no longer request a url, saving unnecessary steps, so how can we determine this? It is actually very simple.
Prerequisite: Add SystemConfi
Android determines the network status. In the Android operating system, how can we correctly determine whether the network we connect is disconnected? Today, we will make a detailed analysis on this application technique.
publicclassConnectionChangeReceiverextendsBroadcastReceiver
{
@Override
publicvoidonReceive(Contextcontext,Intentintent)
{
Conne
The following sectionCodeReturns the network connection status of the current computer.
[Dllimport (" Wininet. dll ")] Private Static Extern Bool Internetgetconnectedstate ( Ref Uint Connected, Uint Reserved ); Static Uint Uconnection = 0x20; /// /// Returns true if it have detected an active Internet connection. /// Public Static Bool Hasinternetconnection{ Get { Return Internetgetconne
I. Using LINQ to find difference sets, intersectionsUsage scenarios:Need to obtain user data from the data center, and with this as the standard, synchronize the user information of the system, delete the redundant users in the system, the missing users to add operations, update the information users to edit the operation updates.Therefore, we need to compare the data center and the existing user information in the system into three parts:(1) LINQ collection, find the user data that needs to be
) { Connectivitymanager Mconnectivitymanager = (connectivitymanager) context. Getsystemservice (Conte Xt. Connectivity_service); Networkinfo mmobilenetworkinfo = Mconnectivitymanager. Getnetworkinfo (Connectivitymanager.type_mobile); if (mmobilenetworkinfo! = null) {return mmobilenetworkinfo.isavailable (); }} return false; }//Gets the type information of the current network connection public static int
I. Detect network connectivity by sending and receiving email regularly#/bin/"Daily test mail" >-S server_state [email protected] -DF./state.txt~Crontab-eAdd the following tasksTen * * * */root/checknkmail Time-sharing WeekSecond, timing detection network status via email sendCheckserverstat Script content:#/bin/Bashecho"Hztelecomdns">state.txtping-C5 202.101.17
, buffer (buff) inside the memory.
Formula: Total=used + Free + buff/cache
The avaliable contains the free and Buffer/cache remaining portions.
PS command
PS aux
Static display of all processes
PS aux |grep nginx
View a process
[[emailprotected] ~]# ps aux |grep nginxroot 2757 0.0 0.0 112664 968 pts/0 R+ 20:57
PID: Process ID, used to kill a process, kill 2757
View a process: Ls-l/proc/505/
Several common functions used by Android to determine the network status
// Determine whether there is a network connection public static boolean isNetworkConnected (Context context) {if (context! = Null) {ConnectivityManager mConnectivityManager = (ConnectivityManager) context. getSystemService (Context. CONNECTIVITY_SERVICE); NetworkInfo mNetworkInfo = mConnect
We can use Window.online to detect the current network condition of the user and return a Boolean valueWindow.addeventlistener ("Online", function () { alert ("Network connection already established") }) Window.addeventlistener ("Offline", function () { alert ("Network connection already Lost") })Note: If you are already online before the pag
Catalogue [-]
First, the judgment equipment
Second, determine the network connection status
Third, the device does not show the solution
First, the judgment equipment
01
//设备名称
02
return[UIDevice currentDevice].name;
03
04
//设备型号,只可得到是何设备,无法得到是第几代设备
.401 Unauthorized The current request requires user authentication .403 Forbidden The server has understood the request, but refuses to execute it. Unlike the 401 response, authentication does not provide any help, and the request should not be repeated.404 Not Found The request failed and the requested resource was not found on the server. 404 This status code is widely used when the server does not want to reveal exactly why the request was reject
You may use the networkinterface. getisnetworkavailable () method to determine the network connection status.
But unfortunately, when I disconnected the computer network (I did a test on the computer simulator and disconnected all wireless wired receivers ), the return value of this method is true.
That is to say, you can still obtain available
relevant information.
Through the instructions above, we find that we can learn more about the networking of a large number of users through this parameter, and provide them with a better experience.Next, we will focus on the return of each browser.
Most browsers return an int type, with the exception of the QQ browser, which returns the type name, which corresponds to the following
qq return value
type
0 unknown
unknown
1 ethernet
to get relevant information.
Through the instructions above, we find that we can learn more about the networking of a large number of users through this parameter, and provide them with a better experience.Next, we will focus on the return of each browser.
Most browsers return an int type, with the exception of the QQ browser, which returns the type name, which corresponds to the following
return value
QQ return value
Type
0
Unknown
UNKNOWN
For example, the TCP network connection status on the server is shown as follows: [root@www.linuxidc.com ~] # Netstat-natActiveInternetconnections (serversandestablished) ProtoRecv-QSend-QLocalAddressForeignAddressStatetcp000.0.0.0: 100500.0.0.0: * LISTENtcp000.
For example, the TCP network connection status on the ser
1) Standby:Broadcast message: Android. Intent. Action. screen_off (CODE)
2) Wake up:Broadcast message: Android. Intent. Action. screen_on (CODE)
3) shutdown:Broadcast message: Android. Intent. Action. action_shutdown (XML or code)
4) network status changes:Broadcast message: android.net. Conn. connectivity_change
(XML or code) then call the following isnetworkavailable to get the current
netstatAnd lsof both are tools under Linux that can be used to view the network status of the system.Netstat-iDisplay the interface table, which is eth0,wlan0 these-rDisplay the routing table, $route as shown in the command-gShow multicast
$netstat -rShow route table, flag means the followingA Receive all multicast at this interface.B OK broadcast.D Debugging ON. M Promiscuous Mode.O No ARP at this in
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