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Log4j should be more familiar to you. Log4j2 is a relatively large upgrade of log4j. The bottom layer uses disruptor rewriting to optimize the asynchronous output log, which greatly improves the performance. The author has made performance comparison among log4j, logback and log4j2, and log4j2 does show absolute advantages. Not much to say, the ...

Article link: http module and fs module http module responseObject common methods: response.writeHead(200,{'Content-Type':'text/plain:charset=UTF-8'}); This method can only be called once on a message and must be calledresponse.end()Before calling. response.write()Send a corresponding body to send the corresponding data to the client.writeI ...

Change AOP in XML mode to annotation mode. Step 1: annotation configuration business class Annotate the ProductService class with @ Component("s") package com.how2java.service; import org.springframework.stereotype.Component; @Component("s") public class ProductService { public ...

Related information/Official website address 1. Install sqlalchemy and check the version Execute the following statement under the command line to install: pip install SQLAlchemy View version after installation: import sqlalchemy print(sqlalchemy.__version__) In addition, PyMySQL needs to be installed, otherwise an error of modulenotfounderr ...

Train of thought: step 1: request Sword come. Novel site, get two things Novel name -- create a folder with novel name under the same directory of Python program Link address for each chapter of the novel step 1 corresponds to the get uurl() function in the code, which also includes the multithreaded code used to speed up ...

I. use servlet 2.5 to initialize parameters Servlet 2.5 is configured based on xml, so it is configured in xml. Servlet 3.0 started to support annotation configuration. There are two kinds of configurations: valid in the current Servlet and valid in the entire web container. When the entire web contai ...

More wonderful articles, pay attention to the public account [tobetopjava Er], more tens of thousands of excellent vip resources for free waiting for you to take!!! Next, we will analyze the basic type of Hash. I'm sure you are familiar with Hash. Next, we will go deep into the source code to analyze the implementation of Hash in Redis. First ...

Summary In the software development, we focus on business logic code, but in the actual development, the code that needs to be written is not only business logic, but also need to deal with logging, exception handling, transaction control and other things unrelated to business. And these codes are also necessary for the server. Codes like this ...

Use MailKit to send an email with embedded pictures that do not appear as attachments Reference article: MailKit --- send mail Be careful Whether to display embedded pictures as attachments in the mail client is different according to different mails. Outlook and qq are not displayed as attachments after testing temporarily, and Sina mailbox ...

Requests html is a relatively new crawler library. The author and requests are the same author. I. installation dependency pip install requests-html When installing, we can see that lxml,reuqests,bs4 are installed... Our common parsing and crawling libraries are installed in him separately. II. Request initiation from requests_html import HTMLS ...