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First, create two files under src to provide the resource files required by the program     (careless programmers should pay attention to the File name, which is in the form of key and value.) the specific code is as follows:           Next, write the code in index.jsp <%@ page language="java" import="java.ut ...

The difference between sleep and wait 1.sleep is a Thread method, while wait is an Object method 2. The sleep method object will not release the object lock, but will suspend execution for a specified time, but the monitoring status will remain, and it will run again when the specified time is up When the wait method is call ...

Project brief This Django project is a test case project for learning tests. Three ways to upload Django files (form, jQuery+jQuery.ajax, native JS + native ajax) are used as the upload function examples file Interpretation of documents form_upload.html form upload file static page jquery_ajax_upload.html jQuery+jQuery.ajax upload file ...

Title gate This problem seems to know that it is a topological sort. In addition, it should be a legal solution to find the smallest dictionary order, so greedy to find the point with the smallest number with the current entry degree of 0. Congratulations, you fell into a hole. In fact, I did this at the beginning. Later, when I ...

We know that in the process of Java programming, if external resources (file, database connection, network connection, redis, etc.) are opened, we must manually close these external resources after they are used. Because the external resources are not managed by the JVM, we can't enjoy the garbage collection mechanism of the JVM. If we don't ma ...

Knapsack problem greedy algorithm [problem description] n items and a backpack are given. The weight of item i is Wi, its value is Vi, and the capacity of backpack is c. How to choose the items in the backpack to maximize the total value of the items in the backpack [problem analysis] ·General knapsack problem! Optim ...

Preface Paging can be said to be a very common function. Most mainstream databases provide physical paging methods, such as Mysql's limit keyword, Oracle's ROWNUM keyword, etc.; as an ORM framework, Mybatis also provides paging functions. Next, the paging functions of Mybatis are introduced in detail. RowBounds page 1. Introduction to rowb ...

I started to learn Java web programming by writing a servlet, rewriting the service method, configuring the web.xml file, and finally deploying it to tomcat or jetty container and starting it. Later, I used some frameworks, struts 2 spring MVC. Today, I rummaged through the source code of JDK and found that the web service can be created very q ...

Main references https://www.cnblogs.com/00986014w/p/9561901.html This blog post, but he's not using the official image of zookeeper I use the Zookeeper cluster with three nodes, which can be modified by reference. ##Build Zookeeper cluster zookeeper-svc.yaml of cluster Service apiVersion: v1 kind: Service metadata: labels: app: zookeeper ...

Eternal topic Memory leak (infamous Bug) Dynamic request heap space, do not return after use There is no garbage collection mechanism in C + + language Pointer cannot control the life cycle of the indicated heap space Programming experiments: memory leaks #include <iostream> #include <string> using namespace std; class Test { ...