Java
-
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…… -
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…… -
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…… -
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…… -
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 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…… -
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 …… -
Summary of Java methods for processing date and time
1、 Java util. Calendar introduction The calendar class is an abstract class that is associated with a set of events s…… -
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…… -
JDBC in Java implements the instance code of inserting millions of data into mysql
I want to insert millions of data into a table for testing. The original idea is to write a cycle for 10W times and tr…… -
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)…… -
Spring4. 0 MVC request JSON datagram 406 error solution
Spring4. 0 MVC request JSON datagram 406 error, how to solve it? Solution 1: 1. Import jackson-core-2.5 1. Jar and jac…… -
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 method for deleting an element in an array
Examples are as follows: Operation results: [1,0] Please enter the number of elements to delete: three [1,8] The above…… -
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 uses JDBC technology to operate SQLSERVER database instance code
JDBC (Java Data Base Connectivity) is a Java API used to execute SQL statements. It can provide unified access to a va…… -
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 …… -
-
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. …… -
Code example of sending mail based on SSM framework + JavaMail
This article introduces the JavaMail application based on the combination of SSM framework (spring 4.0 + spring MVC + …… -
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…… -
Java implementation of the method of counting the number of characters and substrings in a string
This paper describes the method of Java to count the number of characters and substrings in a string. Share with you f…… -
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…… -
Java uses JDBC to insert 10W pieces of data into MySQL database batch (test efficiency)
How to improve the efficiency when using JDBC to connect to MySQL database for data insertion, especially the continuo…… -
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…… -
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…… -
Simple method of file download with Servlet
This paper describes the method of simple file download with servlet. Share with you for your reference, as follows: I…… -
[spring MVC] – simple form submission instance
Spring MVC's own form tags are relatively simple and often need to be completed with the help of El and JSTL. The foll…… -
An interesting phenomenon of Java splitting strings with split
Here is a code: OK, the final output of the above code is 2, which is no problem, but if it is written in the followin…… -
Method of Java regular expression processing special character escape
Regular requires escape characters '$','(',')','*','+','.',' [',']','?','\\','^',' {','}','|' Abnormal phenomena: java…… -
HTTP client requests HTTP data, and JSON turns to an instance of map
Examples are as follows: The above is the whole content of the HTTP client request HTTP data, JSON to map instance bro…… -
Spring MVC learning – detailed explanation of URL parameter passing
In the process of learning spring MVC, it is necessary to understand several key parameters first: @Controller： If yo……