Programmer Think

Implementation through socket object##############################################################The UDP sender needs to be established:The way of thinking is:1. Set up a socket service that can realize UDP transmission2. Specify the data to be sent3. Send data through socket service4. Shut down serviceSteps:1. Create DatagramSocket object2. C ...

1. Development environment server side: centos 7 python-3.6.2 Client: Windows 7 python-3.6.2 pycharm-2018 Program purpose: 1. Learn to use socketserver to achieve concurrent processing of multiple clients. 2. Learn to use struct to solve TCP sticky packages. 2. Programming (I am a novice bird, for development specifications, interface design is ...

The purpose of this study on MiniWeb framework is not to complete the compilation of the framework, but to learn the ideas in the compilation of the framework, mainly to understand the definition and automatic maintenance of routing table, the function of view function, the development idea of separation of front and back ends, and the realizat ...

1. Download the mysql installation package, extract the installation file, and change the name to mysql wget https://cdn.mysql.com//Downloads/MySQL-8.0/mysql-8.0.13-linux-glibc2.12-x86_64.tar.xz 2. Create data directory in mysql folder mkdir data 3. Create mysql user group and mysql user groupadd mysql useradd -g mysql mysql 4. Change ...

What is BigDecimal BigDecimal can represent a floating point number of any size with complete accuracy. Why use BigDecimal instead of double Talk is cheap, Show me the Code. Example 1: double d1 = 0.3; double d2 = 0.2; System.out.println("Double:\t 0,3 - 0,2 = " + (d1 - d2)); float f1 = 0.3f; float f2 = 0.2f; System.out.println("Float:\t 0,3 - ...

1. Tomcat function Our web application will run in Tomcat. Obviously, the request must arrive at Tomcat first. Tomcat will actually process the request as follows: Provide Socket service: the start of Tomcat must be Socket service, which supports http protocol. Request distribution: a Tomcat can provide services for multiple web applications, ...

Communication model (a -- > B -- > A): a sends data to B through UDP (a can be a specified destination, or a broadcast message to b). B sends back a message to a according to the source address and port after receiving the message, which is such a simple communication process. For the explanation of golang udp, please refer to the followi ...

Copyright notice: This is the original article of the blogger. It can't be reproduced without the permission of the blogger. https://blog.csdn.net/u010046908/article/details/50610297 How to use Android Bluetooth 2.0 1.Android operation Bluetooth 2.0 use process (1) fi ...

I use the following script to see if the file exists: #!/bin/bash FILE=$1 if [ -f $FILE ]; then echo "File $FILE exists." else echo "File $FILE does not exist." fi If I just want to check that the file does not exist, what is the correct syntax to use? #!/bin/bash FILE=$1 if [ $FILE does not exist ]; then echo "File ...

It's back to erlang again. It's kind of friendly to go back to erlang after using it for a while. In the project, mqtt is also prepared to be used for message reporting. By the way, I want to see his code. In erlang, application s are managed by a supervisor. In emq, emqttd sup is the largest supervisor, and there are many supervisors or worker ...