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Tomcat service setup steps Initialization of an environment begins with the first graphical interface entered after installation Configure the server to work in command line mode Close iptables and selinux Configure the local YUM source Restart the server to display the demo effect 2. The environment needed to install tomcat Install ...

Set 18-19: Basic Usage of switch Statement, case Penetration, String Usage of switch in JDK7 Basic usage of switch statement The case tag of a switch statement can be an int or a type that can be converted to an int (byte, char, short) [strings can be used in JDK 7.0] Based on the value of the expression, a section of execution is selected fr ...

Overview of WeakHashMap WeakHashMap is a map that stores mapping data based on hash table implemented by weak keys. When the JVM cleans up and reclaims the objects pointed to by these weak keys, WeakHashMap automatically and effectively removes the reclaimed maps from the map. Relevant knowledge cited There are four kinds of references in J ...

I. Explanation _ 2. Installation of Virtual Machine (CentOS 7 is used in this paper) _1. In this paper, CetnOS7 installation and deployment is adopted.   2. jdk1.8   3. Hadoop 2.7.3 hostname ip master 10.10.1.3 slave1 10.10.1.4 3. Install jdk, configure firewall, SSH Modify hostname There is a big difference ...

Construction and Deployment of ELK Platform for Open Source Log Analysis System  I. PrefaceLogs mainly include system logs, application logs and security logs. System operations and peacekeeping developers can log the server hardware and software information, check the configuration process of errors and the causes of errors. Frequent ...

View - By using views, you can get other objects that implement the Collection-Map interface.An example of this is the keySet of the mapping class.At first glance, it looks like this method creates a new set, fills in all the keys in the map, and returns to the set.However, this is not the case.Instead, the keySet method returns a class object ...

brief introduction LinkedList is a two-way linear linked list, but it does not store data in a linear order, but a pointer (Pointer) to the next node in each node. Since it is not necessary to store in sequence, the linked list can achieve O(1) complexity when inserted, which is much faster than another linear table sequence table, but it t ...

Continue with Blog: Spring Technology Insider 3 - Spring AOP Principle (1) https://my.oschina.net/guanhe/blog/1476138 Spring Aop is eventually converted to JdkDynamicAopProxy or Objenesis CglibAopProxy to invoke the object as an entry The entry of JdkDynamicAopProxy is invoke function, and the entry of Objenesis CglibAopProxy is the intercep ...

Write before To judge whether a programmer is good or not is to show me the code.Good code readability, high cohesion, low coupling, scalability.To write good code and be a good programmer, you need to look at the open source framework written by Taurus, absorb the essence of it, learn more about design patterns, and there are no other shortcut ...

Creative Patterns 1. Factory Model An interface for creating objects is defined, but subclasses determine which class to instantiate. The factory method defers instantiation of the class bar to subclasses. // Product Category public interface IProduct { } public class ProductA1 implements IProduct{} public class ProductA2 implements IProduct{} ...