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preface In our daily APP or website, we often need to access data. For example, in wechat, we need to store a series of information such as our user name, mobile phone number, user password, etc. Relying on the Java related knowledge learned before can no longer meet this demand. Now the most basic and widely used application program is relati ...

On the idea of login registration business and the realization of some codes Recently, I started the development of mobile terminal project. As I am in the background, I certainly can't avoid realizing the functions that every app should have: login and registration. At the beginning, I felt very confused. So I write a blog here to share with ...

Development tools and key technologies: Eclipse Software, SSM Multi table addition Author: Chen Long Written on: April 28, 2021 Multi table addition should be a basic addition function required by every project. One function of this practical new data is a basic small function that every programmer must learn. How to realize this function o ...

Virtual machine installation, Linux system and software installation Environmental Science: Software selection: server with GUI Network type: use network address translation (NAT) Power on automatic networking cd /etc/sysconfig/network-scripts/ vim Network profile //ONBOOT = "no" is changed to yes, and there is no need to conne ...

day02 - Java basic syntax 0. Type conversion problem Type conversion (understanding) In Java, there will be different types of data that need to participate in the operation together, so these data types need to be converted to each other. There are two cases: automatic type conversion and forced type conversion. Automatic type conversion ...

4.26-4.27 multi thread learning notes Multithreading 1. Threads are independent execution paths 2. A process contains threads, which may execute a process, and multiple threads are executing at the same time. 3. If multiple threads are opened in a process, the operation of threads is scheduled by the scheduler. The scheduler is closely ...

summary Earlier, we have briefly introduced the authentication process of verifying user name and password. Here, let's take a look at the permission verification process of Spring Security. First, let's use a simple example to get a general idea of what Spring Security authorization is. Examples First of all, let's try to keep it simple. ...

1. High Jump Difficulty: A star Title Description: In the new year, Niu Niu wants to jump higher. Cows themselves can jump high h h HM. At the same time Niu Niu has n n n high jump bou ...

Introduction to reflection Reflection is an important advanced feature in java and is used in many frameworks. Dynamic proxies are also implemented using reflection. Reflection allows us to get all the information about a class or object while the program is running. For a class, reflection obtains all its attributes and method information ...

Before reading this article, it is recommended to read the blogger's article on HashMap: HashMap source code analysis + interview questions HashSet source code analysis 1, Basic introduction The underlying implementation is based on HashMap, so it is not guaranteed to iterate according to the insertion order or other order The time-con ...