Programmer Group

I. Foundation Chapter 1.1 JVM 1.1.1. Java memory model, Java memory management, Java stack and stack, garbage collection http://www.jcp.org/en/jsr/detail?id=133 http://ifeve.com/jmm-faq/ 1.1.2. Understanding various JVM parameters and tuning 1.1.3. Learn to use Java tools jps, jstack, jmap, jconsole, jinfo, jhat, javap, … http: ...

For example, there are multiple requests in index.jsp <a href="<%=path %>/usersAction!add.action">add</a><br> <a href="<%=path %>/usersAction!show.action">show</a><br> <a href="<%=path %>/usersAction!update.action">update</a><br> <a href="<%=path %> ...

Preface: Recently, PM has come to a requirement. In short, it is very troublesome to insert data into the system one by one. Let me implement a method of importing all data directly through excel at one time. There are many examples of importing and exporting excel on the internet, but most of them learn from each other. After thinking, it is ...

The processor interceptor of Spring Web MVC is similar to the Filter filter Filter in Servlet development, which is used to preprocess and post-process the processor. Interceptor application scenarios: 1. Logging: Logging requests for information for information monitoring, information statistics, computing PV (Page View), etc. 2. Privilege ...

Original address: http://www.jackieathome.net/archives/369.html?Utm_source=tuicool&utm_medium=referral Some time ago, testing MM feedback a problem, uploaded images in rich text editor can not be properly rendered. Because Jackie did not observe similar phenomena in the local environment, and just that day an important component of ...

First, create two bean s Note: There must be set/get methods, and member variables must have the same name. public class User1 { String name; String password; String phone; /**Omitting get/set method**/ } public class User2 { String name; String password; String phone; /**Omitting get/set method**/ } 1.Spring's Bean Util ...

First install Docker: $ sudo apt-get install apt-transport-https $ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9 $ sudo bash -c "echo deb https://get.docker.io/ubuntu docker main > /etc/apt/sources.list.d/docker.list" $ sudo apt-get update $ sudo apt-get install lxc-do ...

Solving String HttpMessageConverter Scrambling Problem Question: When we send string objects back to the browser through spring mvc, because the default decoding set in String HttpMessageConverter message converter is ISO-8859-1; because when the browser receives it, it is scrambled. Solve: Through the configuration file, the problem ca ...

1. Talk about the experience of String Utils in org. apache. commons. Lang 　StringUtils.isEmpty(String str) Determine whether the string STR is empty and its length is 0, that is, STR = null & str. length = 0 　StringUtils.isBlank(String str) To determine whether the string str is a blank string and whether it is 0 in length and not ...

I believe that many programmer ape friends are familiar with log4j, log4j can be said to be accompanied by the vast majority of friends to open the programming. I don't know what log4j used to be, at least in my career, it was the era of log4j that led me to start. Log4j is an open source project of Apache. We don't go into its origin, but ...