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Interviewer: what are your commonly used encryption algorithms? Encryption algorithms are usually divided into two kinds: symmetric encryption algorithm and asymmetric encryption algorithm. The symmetric encryption algorithm uses the same key in encryption and decryption; Asymmetric encryption algorithm uses different keys in encryption and ...

I preface This article discusses some simple things, mainly to understand what log portal is and how it is integrated II Log portal The Java Development Manual published by Ali has such a mandatory specification: The API in the logging system (Log4j, Logback) can not be directly used in the application, but the API in the logging framework ...

JAVA object oriented Advantages of object orientation: Consistent with human thinking, "class" simulates abstract concepts in the real world, and "object" simulates entities in the real worldInformation hiding to improve the maintainability and security of the program: encapsulating the attributes and behaviors of the ...

What is an exception Abnormal situation An abnormal condition that occurs during the operation of a program, resulting in the unexpected termination of the program. How to handle exceptions In Java, the exception information is encapsulated into a class. When a problem occurs, it will create an exception class object and throw exception rela ...

  Thorwable class (indicating that it can be thrown) is the superclass of all exceptions and errors. The two direct subclasses are Error and Exception, which represent errors and exceptions respectively. The Exception type Exception is divided into runtime Exception and non runtime Exception, which are very different, also known as Unchecke ...

First, we will learn how to use JSTL Taglib to localize JSP pages. In addition, we will demonstrate how to use request parameters, session attributes and cookie values to select the preferred language in JSP pages. In addition, we will use Maven to set up the project. Therefore, we hope readers have the basic knowledge of Java Web Application, ...

1, Object class 1.1 overview of object class Package: Java lang Class definition: public class Object Class Object is the root class of class hierarchy. Each class uses Object as superclass. All objects (including arrays) implement the methods of this class. Why define a hierarchy root class? Java believes that all objects have some basic ...

2. Service invocation 2.1 LoadBalancer integrates RestTemplate to call other micro services 2.1.1 introduction 2.1.1.1 introduction to resttemplate RestTemplate is a network request framework in Spring Resources that accesses third-party RESTful API interfaces. The design principle of RestTemplate is similar to that of other spring template ...

Today, I'm doing android development related to this avatar. I keep looking for data on the Internet and don't know anything. Then I copy it. What's the problem? Now android can open a camera without simply asking for it. According to the data I found today, the URI of the file can't be used outside of this APP, so a conversion is needed. Then ...

I summary What is RPC? Remote service callOfficial: the idea of requesting services from remote computer programs through the network without understanding the underlying network technologyA little more popular: without knowing the details of the call, the client calls an object that exists on the remote computer, just like calling an objec ...