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Learning objectives Cross domain requestFile uploadMail processing Cross domain request 1. How to understand cross domain What is cross domain? Cross domain refers to the mutual access between different domain names, which is determined by the browser's homology policy. It is a security measure imposed by the browser on JavaScript to preve ...

Introduction:   This article will take lazy loading as an example to introduce various concepts in functional programming step by step, so readers don't need any foundation of functional programming, just need to know a little about Java 8. Author Xuan Heng Source: Ali technical official account This article will take lazy loading as a ...

1. Overview of API and Object class 1.API(Application Programming Interface)       Application programming interface 2.Java API      It is the classes provided by Java for us to use. These classes encapsulate the underlying implementation,      We don't need to care about how these classes are im ...

preface Today, let's talk about the operation of files in Java, IO stream (input / output stream). First, in the computer, the information set of files on the computer can be text, pictures, videos, etc. Files are stored in binary Input and output streams Input stream: an object from which a sequence of bytes can be read is called an inpu ...

1, Anonymous class Anonymous classes in Java are classes without names. They are just syntax sugar to avoid template code declaring and instantiating a one-time class. (1) It is an internal or local class without a name, and only one object is created for it. (2) An anonymous class is an expression, which means that the class needs to ...

1, Project scenario: Develop a simple user information list management system, which can be used to add, delete, modify and query user information. The following shows the functional effect diagram of the modified system: (1) When the server is started, there is an administrator login page. You need to log in successfully before you can ent ...

functional analysis Login interface components: login interface name, account label, password label, account dimension, password dimension, login button and registration buttonRegistration interface components: account label, password label, password confirmation label, registration confirmation button and cancel buttonLogin button functio ...

Many partners know that Xiaobian has been submitting Hippo4J dynamic thread pool project since June this year After 200 + Commit, the official version of 1.0.0 will be released soon. Today, I will write an article to formally introduce the project architecture of Hippo4J Hippo4J GitHub: https://github.com/acmenlt/dynamic-threadpool If you ...

Introduction to Kafka Kafka is a popular distributed message subscription system. In addition to Kafka, there are MQ, Redis, etc. We can regard the message queue as a pipeline. The two ends of the pipeline are the message producer and the message consumer respectively. After the message producer generates logs and other messages, it can be s ...

1 nested for loop 1.1 general There are at least two for loops. Judge whether the inner layer can be executed according to the conditions of the outer layer If it can be executed, loop the inner layer code, and then continue to judge whether to execute the next loop of the outer layer loop 1.2 nested for m   1.3 exercise: nested for loop ...