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Spring Security Principles

Spring Security adopts the chain of responsibility design pattern. There is a long filter chain. First, the client initiates a request and enters the Security filter chain; then it determines whether it is a login; finally, it finds the corresponding authentication manager based on the URI. , perform authentication.

Jun 23, 2020 pm 02:42 PM

java spring

Detailed explanation of Spring IoC and AOP principles

The principle of Spring IoC is implemented through the reflection mechanism. When instantiating a class, it calls the set method in the class through reflection to inject the class attributes previously saved in the HashMap into the class. AOP aspect-oriented programming is based on IoC and is an adaptation of OOP. A useful supplement that can reduce the coupling between modules.

Jun 23, 2020 am 09:23 AM

aop ioc java

How to generate random numbers in java

Methods for randomly generating numbers in Java include: 1. Use the [new Random()] constructor to generate a random number generator to generate numbers; 2. Use the [Math.random()] method to generate a random number generator to generate numbers. .

Jun 22, 2020 pm 05:58 PM

java

Detailed explanation of trim() method in java

In Java, you can use the "trim()" function to remove excess spaces. This function is used to remove excess spaces at both ends of the string. Its syntax is "trim()", and its parameter return value is the excess spaces at both ends of the string. A string of spaces, and no matter how many spaces there are at both ends, they will be removed, and the spaces in the middle will not be removed.

Jun 22, 2020 pm 05:40 PM

java

How to import Java files and run idea

The method for importing and running idea java files is: first open the idea software and enter the startup interface; then click [lmport Project], select the pom.xml file, and click Open, keep [next]; finally click [finish] to find the main method, click Run.

Jun 22, 2020 pm 05:29 PM

idea java

What are the eight basic data types in java

The eight basic data types of Java are: 1. Integer type, including byte, short, int, long; 2. Floating point type, including float, double; 3. Logical type, boolean [it has only two values ????which can be true and false] ;4. Character type, char.

Jun 22, 2020 pm 03:51 PM

java

Create a SpringBoot project using IDEA

The steps for creating a springboot project with idea are: first open IDEA, create a new project, and select [Spring Initializr]; then enter [Artifact] and check Web; finally click finish to complete.

Jun 22, 2020 pm 02:06 PM

idea springboot

Is 'spring provides abstraction of the jms layer' correct?

Spring provides abstraction of the jms layer, which is correct. Spring provides a jms integration framework, which simplifies the use of "jms api" just like spring integrates "jdbc api"; jms can be simply divided into two functional areas, message production and message consumption.

Jun 22, 2020 am 10:26 AM

spring

Can static methods in java be overridden?

Static methods in Java cannot be overridden, but they can be inherited. If the static method names of the parent class and the child class are the same, the parent class static method will be hidden. Static methods are bound at compile time, and method overrides are bound at runtime.

Jun 20, 2020 pm 04:10 PM

java rewrite static method

How to define an integer two-dimensional array in java

The way to define an integer two-dimensional array in Java is: [int[][] array = new int[3][3];] or [?int[][] arra = new int[][]{{ 10,20,30},{40,50,60},{70,80,90}}].

Jun 20, 2020 pm 03:51 PM

java Two-dimensional array integer

What are the new features of java14

The new features of java14 are: 1. Switch expression; 2. Text block; 3. Pattern matching of instanceof; 4. Record; 5. Exception NullPointerException. The new Switch expression no longer has a default skip behavior, and expressions and combinations are easier to write.

Jun 20, 2020 pm 01:33 PM

characteristic

How to output multiplication table in java

The method for java to output the ninety-nine multiplication table is: we can achieve it through double for loops. The outer for loop controls the number of rows, and the inner for loop controls the number of columns. The specific implementation method is: [for(int i=1;i<10;i++){for(int j=1;j<=i;j++)}].

Jun 20, 2020 am 11:33 AM

java

What are the classifications of java middleware?

The categories are: application service middleware, application integration middleware, and business architecture middleware. Application service middleware provides a comprehensive computing environment and support platform for application systems; application integration middleware provides functions of message communication, services, and data integration between different network application systems; business architecture middleware includes business processes , business management, etc.

Jun 20, 2020 am 10:45 AM

java middleware

How to use java newline character

Use of newline characters in Java: 1. You can use System.out.println() to change a new line; 2. Use System.out.print("\n") to change a new line, and the newline character under Windows is [/r /n], the newline character under Linux is [/n].

Jun 19, 2020 pm 05:58 PM

java newline character