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1.IO stream classification According to the direction: input stream (such as the file you copied) output stream (such as the new file you copied) By unit: byte stream (data transmission in bytes) Character stream (data transmission in characters char) According to function: node flow (equivalent to needle) filter flow (equivalent to needle ...

prefaceIn introduction to database transactions and learning notes on MySQL transactions (I), we have discussed transaction related concepts, transaction related operations, how to start a transaction, rollback, etc. How should we do the transaction operation in the program. In Java, transactions are controlled through JDBC API. This method is ...

1. Text 1. What is MVC architecture? 2. What is the spring MVC framework? 3. Why use spring MVC architecture? 4. Quick start spring MVC? 5. The process of spring MVC. 6. How spring MVC accepts the requested parameters. 7. How does spring MVC forward the parameters of the control layer to the front-end page? 2. What is MVC architecture? ...

This article mainly introduces the installation of MongoDB and the software versions used: MongoDB 5.0.5 and Centos 7.6. 1. Stand alone installation 1.1. Download and unzip MongoDB Download address: https://www.mongodb.com/try/download/community Decompression: tar zxvf mongodb Linux x86_ 64-rhel70-5.0.5. tgz 1.2. Create data and log direct ...

1, Requirement description When encountering a task at work, conduct error log monitoring on the asynchronous tasks executed in the thread pool opened in the scheduled task to ensure that the scheduled task can run normally, or when the first exception occurs, the operation and maintenance personnel can quickly find the problem task through th ...

1. Classification of Java locks (reference link: https://tech.meituan.com/2018/11/15/java-lock.html ) (1) Optimistic lock VS pessimistic lock: * * optimistic Lock: * * Lock the data first to ensure that the data will not be modified by other threads. The synchronized keyword and the implementation class of Lock are pessimistic locks. It is su ...

For Java developers, no one dares to underestimate the importance of Spring Boot. Now when you go out for an interview, no matter how small a company or project, you have to talk about Spring Boot and micro services. If you can't chew it down, you may miss the big factory. If you are proficient in the principle and implementation of Spring Boo ...

I What is reflection Reflection is a dynamic mechanism in java, which allows us to determine the instantiation of objects and the call of methods during the running of programs, Property operation, etc. The flexibility of the program is greatly improved, but it also brings more resource overhead and lower cost Operation efficiency. ...

The file upload of Spring MVC framework is based on the Commons fileUpload component, which is further encapsulated, which simplifies the code implementation of file upload and eliminates the programming differences of different upload components. MultipartResolver interface It is very easy to upload files in Spring MVC. It provides dire ...

1, Overview of design patterns 1.1 introduction to design mode Design pattern is the useful experience that programmers have summed up in the face of similar software engineering design problems. Pattern is not code, but the general knowledge of a certain kind of problems With solutions, design patterns represent best practices. These so ...