Recent Posts
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Java uses POI to obtain the number of columns and rows in Excel
preface Report output is often involved in Java application development, while general reports often lack universality…… -
Perfectly solve the problem of lazy thread safety in singleton design mode
First, write a single example: Write a test class: The running result is always true, indicating that there is no prob…… -
JDBC addition, deletion, modification, query and unique complete code analysis
Part I code (entity class) Part II BaseDao (addition, deletion, modification, query and unique query) Part III hehedao…… -
Facade of Java design pattern
summary External and internal subsystems must communicate through a unified appearance mode object, that is, appearanc…… -
Java export method for generating CSV file
First of all, we need to have a basic understanding of CSV files. CSV files are similar to excel and can be opened wit…… -
Detailed explanation of several implementation methods of converting Java list into string array
Convert Java list to string array Implementation code: or Thank you for reading, hope to help you, thank you for your …… -
Java file into byte array knowledge summary and example explanation
Java converts files into byte arrays Keywords: file, file stream, byte stream, byte array, binary Absrtact: the demand…… -
Perfectly solve the problem of outputting Chinese garbled code in servlet
As follows: The above article perfectly solves the problem of outputting Chinese garbled code in servlet, which is all…… -
The difference between string class and StringBuffer class in Java
There are two string operations in Java: String class and StringBuffer class (buffer string processing class). Let's b…… -
Spring MVC file upload and download examples
Upload and download spring MVC files as follows: (1) Import jar package: ant jar、commons-fileupload. jar、connom-io. …… -
Spring dynamic multi data source configuration instance demo
Recently, many people have consulted spring on how to configure multiple data sources, so it is troublesome to answer …… -
Talk about setting codes for JAXB and response to solve wechat4j Chinese garbled code
If there is a little partner as a programmer who says he has not encountered the problem of Chinese garbled code, I do…… -
Java implements form submission (supports simultaneous uploading of multiple files)
In Android or J2EE, it is necessary to lie on other people's website data. It is very common to simulate form submissi…… -
Java split string explanation and example code
Java split string java. Split() method of lang. string, JDK 1.4 or later public String[] split(String regex,int limit)…… -
Solve the problem of inconsistent cookies before and after Java background login
Recently, the company's security group raised a bug that requires us to log in with inconsistent cookies. This is a wo…… -
Summary of 35 methods of performance optimization in Java
preface For programmers, code optimization is a very important topic. Some people may think it's useless. What can be …… -
Detailed explanation of source command under Linux
Analysis of execution mode of Linux source command and script When I modify the / etc / profile file, I want it to tak…… -
Java class loading and custom class loader
Class loading All class loaders are subclasses of classloader. Class loaders always start with Class runs in the direc…… -
Instance method of java image clipping and thumbnail generation
1、 Thumbnail When browsing the album, you may need to generate corresponding thumbnails. Direct code: Directly run th…… -
Comparison of several methods for judging the same elements in HashMap, HashSet, treemap and TreeSet in Java
Comparison of several methods for judging the same elements in HashMap, HashSet, treemap and TreeSet in Java 1.1 HashM…… -
JavaMail Getting Started tutorial receiving mail (4)
In the third part of the previous introduction to JavaMail, we learned how to send mail using the transport class prov…… -
Java method for reading TXT file
Java reads the contents of TXT file. It can be understood as follows: The above is the whole content of this article. …… -
Java value passing and reference passing
When an object is passed as a parameter to a method, the method can change the properties of the object and return the…… -
Detailed explanation of java thread (thread, runnable, callable) examples
Java thread vs. thread, runnable, callable Java uses thread class to represent threads. All field objects must be inst…… -
[redis caching mechanism] detailed explanation of Java connection to redis_ Jedis_ affair
Jedis transaction When we use JDBC to connect to MySQL, we need to start the transaction every time before executing t…… -
Java uses IO stream to split and merge large files
Java uses IO stream to split and merge large files File segmentation should be a practical function. For example, you …… -
JavaWeb session expiration time setting method
The session expiration time setting method is as follows: 1、 Java code <-- Priority is highest -- > 2、 Web xml…… -
Example code of redis operation using jedis in Java
Using java to operate redis requires jedis-2.1 0.jar, download address: jedis-2.1 0.jar If you need to use redis conne…… -
A method of extracting data using regular expressions in Java
What is a regular expression Regular expressions are specifications that can be used for pattern matching and replacem…… -
Explain the five ways to let you read the contents of the properties file in Java is no longer a problem
1、 Background Recently, in the process of project development, some custom variables need to be defined in the proper…… -
Detailed explanation of flow object selection law in Java programming
Examples are as follows: The above is a detailed explanation of the flow object selection law in Java programming brou…… -
Explain various applications of java reflection in detail
In addition to providing us with all kinds of information about the class at compile time, Java also allows us to get ……