Java
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Method for converting object bean and dbobject to each other when operating mongodb with Java (recommended)
As follows: The above is all the contents of the method (recommended) of mutual conversion between object bean and dbo…… -
Reflection mechanism and application scenario of java learning
preface: *** Version x or retrofit, and the early view annotation framework all use java reflection mechanism more or …… -
Sending mail for JavaMail tutorial (3)
The JavaMail API defines a Java mail. Transport class, which is specially used to perform mail sending tasks. The inst…… -
Log4j implementation method of outputting logs to different files by level
As follows: The above is all about the implementation method of log4j outputting logs to different files by level. I h…… -
Detailed explanation of MySQL storing Java object instances
MySQL stores Java objects MySQL sets the field to blob To save an object, first serialize the object as byte [] and us…… -
Handling method of exception when gson parses empty string
preface In actual development projects, the server often uses the empty string "" as the return result to represent th…… -
Method for deleting specific elements in ArrayList loop of Java collection class
In project development, we may often need to dynamically delete some elements in ArrayList. One wrong way: The above m…… -
Java uses POI to import and export excel table sample code
introduce Jakarta POI is a set of Java APIs for accessing documents in Microsoft format. Jakarta POI consists of many …… -
Implementation of infinite level tree structure method in Java and JS (similar to recursion)
JS: java: The above tree structure method (similar to recursion) for realizing infinite levels in Java and JS is all t…… -
POI reading of Excel custom date format (example code)
Reading Excel data with POI: (version No.: poi3.7) @H_ 404_ 4@1 , read Excel @H_ 404_ 4 @ 2. Excel data processing: Th…… -
Eclipse exports executable java project / executable jar files (including third-party jar packages)
Eclipse exports executable java project / executable jar files (including third-party jar packages) Elder martial brot…… -
Teach you to easily make java music player
1、 Implementation principle of music player The multimedia function of javase is very weak, so there is a plug-in ded…… -
Regexutils. Java regular expression validation tool class java
Regular expressions are often used to verify various forms. Java forms register common regular expression verification…… -
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Blob (binary large object), a binary large object, is a container that can store binary files. In the computer, blob i…… -
Java sending httpclient request and receiving request result
I 1. Write an httprequestutils tool class, including post request and get request 2. Write business code and send HTTP…… -
JavaWeb can only log in at one place at a time with the same account (similar to QQ login function)
JavaWeb realizes that one account can only log in at one place at a time (similar to QQ login function). The implement…… -
Shopping Cart module of Java Web Book Mall Design (3)
This article continues to share the shopping cart module in Java Web Book Mall for your reference. The specific conten…… -
Summary and difference between JDBC transaction and JTA distributed transaction in Java
There are three types of Java transactions: JDBC transactions, JTA (Java transaction API) transactions, and container …… -
POI reading of Excel custom date format (example code)
Reading Excel data with POI: (version No.: poi3.7) @H_ 404_ 4@1 , read Excel @H_ 404_ 4 @ 2. Excel data processing: Th…… -
Summary and solution of garbled code in Java
Garbled code in Java In recent projects, we often encounter the problem of garbled code in Java, so we took time to so…… -
Java send HTTP post request instance code with basic auth authentication
Construct HTTP header Old way: Httpclient mode The above example code of HTTP post request sent by java with basic aut…… -
Solution to Chinese garbled code when Java reads the properties configuration file
As follows: The above is what Xiaobian brought to you. When reading the properties configuration file in Java, the sol…… -
A variety of algorithms for generating sampling random numbers in Java
This chapter first explains several ways of generating java random numbers, and then demonstrates them through example…… -
Java is a simple method to get the header and body of HTTP request
In HTTP requests, there are header and body, and request is used to read header getHeader("..."); Read the body and us…… -
POI reading of Excel custom date format (example code)
Reading Excel data with POI: (version No.: poi3.7) @H_ 404_ 4@1 , read Excel @H_ 404_ 4 @ 2. Excel data processing: Th…… -
Java Web realizes QQ login function. One account can only be logged in by one person at the same time
For an account, only one person can log in at the same time, which can be realized by the following methods: 1. When t…… -
Intercept the JSP page and verify whether it has been logged in. Explain and implement the code
Intercept the JSP page and verify whether it has been logged in Recently, for projects using struts 2, it is necessary…… -
Summary of exception handling in Java EE project (an article I have to read)
Why talk about exception handling in J2EE projects? Many java beginners may want to say, "exception handling is not tr…… -
Four methods of parsing XML in Java
XML has now become a general data exchange format. Its platform independence, language independence and system indepen…… -
Transformation and transfer method of JSON in Struts
This paper mainly discusses how to quickly convert ordinary data into JSON data, and discusses two methods: To prepare…… -
Java object-oriented interview collection
Java object-oriented: here is the basic object-oriented knowledge to help you learn and understand. I hope it can help…… -
Detailed explanation and examples of Java overload and override
Many students don't know the difference between overload and override. It is recommended not to memorize conceptual kn……