[JSP] operating principle of JSP

When a JSP page on the server is requested for execution for the first time, the JSP engine on the server first translates the JSP page file into a Java file, and then compiles the Java file to generate a bytecode file, then, you can run the bytecode file to respond to your request. When the JSP file is requested to be executed again, the JSP Engine will directly execute the bytecode file to respond to the customer. This is one of the reasons why JSP is faster than ASP.
The main work of bytecode files is: (1) Submit the common HTML Tag (static part of the page) on the JSP page to the client's browser for display. (2) execute Java between "<%" and "%>"ProgramSlice (dynamic part of the page), and submit the execution result to the client's browser for display. (3) When multiple customers request a JSP page, the JSP Engine automatically starts a thread (not a process) for each customer. These threads are managed by the JSP engine server, it is more efficient than the traditional CGI to start a process for each customer.