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SSM integration Bili Bili crazy God says Java learning website The article is only for sharing learning experience and reviewing. It is more effective to check the formal video website and official documents Make a book query project using SSM framework Simple core axis of the project The eclips e development tool I use may be differen ...

preface Better manage the connection with the database, avoid memory leakage and server crash due to too many connections, and reduce resource consumption. 1, Database connection pool 1. The necessity of JDBC database connection pool When developing web programs based on database, the traditional mode basically follows the followi ...

Custom viewgroups can be divided into three categories according to their parent classes: inherited from ViewGroup, inherited from system specific ViewGroup (such as LinearLayout) and inherited from View. The second is the simplest and the third is the most complex. Let's focus on the first case with moderate difficulty. target Follow ViewPag ...

Learning resources: Pull hook Education What is a ranking problem Sorting - the process of turning a group of unordered data into order. Generally, the order here is from small to large by defaultMeasure the advantages and disadvantages of a sorting algorithm Time complexity - specifically, the best time complexity, the worst time complexi ...

Mybatis inserts multiple records using the @ Insert annotation Several methods of converting JSONObject to List In a large software engineering job, if an administrator wants to send messages to multiple users, the front end needs to send an array with user numbers to the back end. Here is a summary of several methods for the back-end to rece ...

1, Create local project Because microservice is an aggregate project, we need to create a blank folder locally as the local project workspace. All project modules are in the workspace. Remember that it must be a blank folder without anything in it or any Chinese on the pathOpen idea, select file - > open, go in and select the newly crea ...

pojo package com.kuang.pojo; public class Hello { private String str; public String getStr() { return str; } public void setStr(String str) { this.str = str; } @Override public String toString() { return "Hello{" + "str='" + str + '\'' + '}'; } } xml ...

Don't say much about the description. Go directly to the figure above: See the output? Why is the time difference between the first time and the second time so much? Let's think about it together. We can also look at the conclusion first and then look back at the analysis Note: not only the second time, but every time after the first t ...

Integrate JUnit @SpringBootTest defines that Springboot04JunitApplicationTests is a Test class that supports injecting objects. Once injected, this object can participate in @ Test. Name: @ SpringBootTest Type: test class annotation Location: above the test class definition Function: set the spring boot startup class loaded by JUnit example: ...

Thread pool [understand] Status of the thread NEW      Threads that have not yet started are in this state.   RUNNABLE      The thread executing in the Java virtual machine is in this state.   BLOCKED      A thread that is blocked and waiting for a monitor lock is in this state.   ...