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JavaWeb-- File upload and download

In this case, you need to create a temp directory under the project directory to temporarily store uploaded files. If the number of bytes exceeds the threshold, the files are saved to the hard disk. Otherwise, the files are saved to the memory. The system will automatically generate folders for uploading and saving under the project uload directory. In this project we learned about file uploading and copying, using two ways to implement, not forgetting the basic operation of IO, but also using...

Web basics and Servlets

Software architecture C/S: client/server B/S: browser/server 2. Classification of Web resources Static resources: Each user responds to a request with the same resources, which can be directly parsed by the browser, such as HTML, CSS, and JavaScr

MySQL (3) basic query

SQL query statement is the development of the most used is also the most important statement, our network life is now all in the query operation, such as: open wechat to see circle of friends, jingdong Taobao shopping goods, baidu to find some things, brush the headlines on the phone and so on. Query statement is more flexible, there are many kinds of usage, master them to our program development has an important role. Select field 1 alias, word...

multithreading

! [ConcurrentHashMap1.7 principle summary. PNG] (HTTP: / / https://p1-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/46b22389c7c6471ea

Programming architecture 07: Web development for JavaEE

In Client/Server mode, both server-side programs should be written and Client programs should be developed. When software is updated, both Client and Server sides need to be updated. Compared with BS architecture, the overall mode is more complex, but with higher security. Namely Browser/Server (Browser/Server), only need to write server-side procedures, Browser interface as access to the service...

Mmall_v2.0 Redis + Cookie to implement single sign-on

In an e-commerce project, when a user logs in to a single server, the user information is set to the session. The user information is obtained from the session and deleted from the session when the user logs out. However, after setting up the Tomcat cluster, you need to consider the Session sharing problem, which can be realized through single sign-on solution, there are two main methods, one is...

Tomcat Servlet and JSP

J2EE is a Java enterprise level development specification, is a group of technical specification guide, the specific implementation is decided by the software manufacturer, such as Tomcat, Jboss, Weblogic, Tomcat is J2EE JSP and Servlet two modules of the standard implementer. Note that Tomcat is not a complete J2EE implementation. J2SE is a J2EE operation...

Java multithreading (a) multithreading introduction

Process is the basis of the operating system structure, is a program execution, is a program and its data structure in the processing machine sequential execution of the activities, is the program in a data set to run the process, it is the system for resource allocation and scheduling an independent unit. In simple terms, a task manager list of an EXE file can be understood as a process, such as Qi.exe is a process, process is subject to...

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