router hardening

character stream, and then flows through a character bufferPanax Notoginseng //InputStreamReader ISR = new InputStreamReader (is); - //BufferedReader br= New BufferedReader (ISR); theBufferedReader br =NewBufferedReader (NewInputStreamReader (system.in)); + ASystem.out.println ("Please enter a string:"); theString line =br.readline (); +System.out.println ("The string you entered is:" +Line ); - $System.out.println ("Please enter an integer:"); $ //int i = Integer.pars

1. Examples of cases:1 PackageCom.himi.trycatch;2 3 Public classExceptiondemo {4 5 Public Static voidMain (string[] args) {6 intA = 2;7 intb = 0;8 Try {9System.out.println (A/b);Ten}Catch(ArithmeticException ae) { OneSYSTEM.OUT.PRINTLN ("Divisor cannot be 0"); A } -System.out.println ("Over"); - the } - -}The results of the operation are as follows:As you can see from the running results above, there is a possible problem with the 9th line of code bei

corresponding pattern + * Year y A * Month M at * Day D - * Hours H - * min M - * seconds S - * - * December 12, 2014 12:12:12 in */ - Public classDateformatdemo { to Public Static voidMain (string[] args)throwsParseException { + //Date--String - //Create Date Object theDate d =NewDate (); * //creating a formatted object $ //SimpleDateFormat sdf = new SimpleDateFormat ();Panax Notoginseng //given pattern -SimpleDateFormat SDF =NewSimpleDateFormat

1. Analysis:(1) Keyboard entry for any year(2) Set the date of the Calendar objectYear: That is (1) the data enteredMonth: Yes 2 (March)Day: Yes 1(3) Push the time forward one day, the last day of February(4) Output this day2. code example:1 Packagecn.itcast_03;2 3 ImportJava.util.Calendar;4 ImportJava.util.Scanner;5 6 /*7 * Get how many days in February of any year8 * 9 * Analysis:Ten * A: Keyboard entry for any year One * B: Set Calendar object's Month day A * Year is the data of a input - *

; atInteger I6 = 128; -SYSTEM.OUT.PRINTLN (i5 = =I6); - System.out.println (I5.equals (I6)); -System.out.println ("-----------"); - -Integer i7 = 127; inInteger i8 = 127; -System.out.println (i7 = =i8); to System.out.println (I7.equals (i8)); + - //by looking at the source code, we know that for data between 128 and 127, a data buffer pool is made, and if the data is within that range, no new space is created each time the //Integer II = integer.valueof (127); * } $}The res

that generates random numbers7 * 8 * Construction Method:9 * Public Random (): No seed, with default seed, is the millisecond value of the current timeTen * Public Random (long Seed): gives the specified seed One * A * Once the seed is given, the random number obtained is the same each time. - * - * Member Method: the * public int nextint (): Returns a random number in the range of int - * public int nextint (int n): Returns the internal random number of the range of [0,n] - */ - Public c

1. Overview of the Integer class(1) The integer class wraps a value of a primitive type int in the object, and an object of type integer contains a field of type int.(2) This class provides several methods for converting between int and string types, as well as some other constants and methods that are useful when dealing with int types.2. How integer is constructed(1) public Integer (int value);(2) Public Integer (String s);3. Case of the Integer class1 Packagecn.itcast_02;2 3 /*4 * Method of

(intx = 0; x ) { - //Invoke function - intnum =getrandom (start, end); - //Output Results - System.out.println (num); in } - } to + /* - * Write a function two explicit: return value type: int argument list: int Start,int end the */ * Public Static intGetrandom (intStartintend) { $ //think back to the random numbers we talked about between 1-100.Panax Notoginseng //int number = (int) (Math.random () * +) + 1;//(int) (Math.r

1.Date of two methods:1 Public Long getTime (): Gets the time, in milliseconds 2 Public void settime (long ): Set time2. code example:1 Packagecn.itcast_02;2 3 Importjava.util.Date;4 5 /*6 * Public Long getTime (): Gets the time, in milliseconds7 * public void settime (long): Set time8 * 9 * get a millisecond value from date Ten * GetTime () One * Converts a millisecond value to date A * Construction Method: Public date (long date): Creates a Date object based on the given millisecond v

a value ? - // //Public String Group () in //String ss = M.group (); - //SYSTEM.OUT.PRINTLN (ss); to // + // //one more time. - //flag = M.find (); the //System.out.println (flag); * //ss = M.group (); $ //SYSTEM.OUT.PRINTLN (ss);Panax Notoginseng - while(M.find ()) { the System.out.println (M.group ()); + } A the //Note: Be sure to first find () before group () + //Illegalstateexception:

[] temp =New int[data.length]; -MergeSort (data, temp, 0, data.length-1); the } - - Private Static voidMergeSort (int[] Data,int[] temp,intLintr) { - intMid = (L + r)/2; + if(L = =R) - return; + mergesort (data, temp, l, mid); AMergeSort (data, temp, MID + 1, R); at - for(inti = l; I ) { -Temp[i] =Data[i]; - } - intI1 =l; - intI2 = mid + 1; in for(intcur = l; Cur ) { - if(I1 = = Mid + 1) toData[cur] = tem

1. Problem: Running Javac report Javac is not an internal or external command, but running Java, java-version normal?See if the following three environment variables are set correctly:(1) environment variable java_homeSet Java_home as the JDK installation path, as follows:(2) environment variable PATH(3) environment variable CLASSPATHSummarize:CLASSPATH.;%java_home%\lib; (Note: Front pastry, semicolon, back semicolon)Java_home D:\software\Android\JDK\install (note: Both front and rear are unsign

This article ish5eduAgency officialHTML5 Trainingtutorial, main introduction: javascript intensive tutorial--function parametersThe JavaScript function parameter JavaScript function does not perform any checks on the value of the parameter (arguments). function explicit parameters and hidden parameters (arguments) in the previous tutorial, we have learned the explicit parameters of the function: functionname (parameter1, parameter2, parameter3) {code to be executed} The function explicit paramet

">/ETC/MOTD###################################################################################配置远程日志保存cp/etc/syslog.conf/etc/syslog.conf. ' Date +%f 'echo "* * @192.168.0.1" >>/etc/syslog.conf#记录帐户登录日志Touch/var/log/authlogecho "Auht.info/var/log/authlog" >>/etc/syslog.conf#存在类似 *.err;kern.debug;daemon.notice; /var/log/messagesecho "*.err;auth.info/var/adm/messages" >>/etc/syslog.conf#存在authpriv. Info/var/log/authlog Configurationecho "uthpriv.*/var/log/authlog" >>/etc/syslog.conf###############

system Evaluation analysis, do a few aspects of security reinforcement, the main strategy involves the following points: Cancel the root remote SSH login of all the servers, restrict Su-root user rights, and SSH login port adjustment, external SSH login all adjust; Adjust password expiration time and complexity; Adjust the network flooding, SYN and other anti-attack strategy parameters; Clean the server invalid account such as LP, news, etc., adjust the System key directory

with methodsDefining enumerations TrafficlampImplementing the normal Next methodImplement the abstract next method: Each element is an instance object generated by the subclass of the enumeration class, which is defined in a manner similar to an inner class.To increase the construction method on the representation timeWhen an enumeration has only one member, it can be implemented as a single instance.Write enumeration steps and tricks with abstract methods:1. Enumtrafficlamp{red,green,yellow}2.

. These methods for external classes are called by each Runnable object that is an inner class.The combination of the above two ways: the shared data is encapsulated in another object, each thread to the method of sharing the data is also assigned to the object to complete, the object as a member of the external class variables or local variables in the method, The Runnable object for each thread acts as a member inner class or local inner class in an external class.In short, it is best to synch

the face of complex serialization or reflection attacks. * Single-element enumeration types have become the best way to implement Singleton. * @author Liu Xiangfeng * * * * Public enumEnumsingleton {INSTANCE; Public void leavethebuilding(){}}/** * Serialization of Singleton mode * @author Liu Xiangfeng * */ Public class Serializesingleton implements Serializable { //Declare all instance domains to be instantaneous transient Private Static FinalSerializesingleton INSTANCE =NewSerializesin

appropriate room security is scheduled.#9, disable services that you do not need. Disable all unnecessary services and daemons, and remove them from the system boot. Use the following command to check if a service is booting with the system.grep ' 3:on 'To disable a service, you can use the following command:# service ServiceName stop# chkconfig serviceName off#9.1, check the network monitoring port.Use the netstat command to see which listener ports are on the server # NETSTAT-TULPN if you hav

,denyDeny from allTrojan Avira and Prevention:Grep-r--include=*.php ' [^a-z]eval ($_post '/home/wwwroot/Grep-r--include=. php ' file_put_contents (. $_post[.*]); '/home/wwwroot/Using Find Mtime to find the last two days or the days of discovering a trojan, which PHP files have been modified:Find-mtime-2-type F-name *.phpTo change directory and file properties:Find-type f-name *.php-exec chomd 644 {} \;Find-type d-exec chmod 755 {} \;Chown-r www.www/home/wwwroot/www.test.comTo prevent cross-site