simple java projects

The most recent Web application has always been running for a period of time after the java.net.UnknownHostException This exception, from the literal understanding that there is no host such as the exception. After the restart of the application this exception will disappear, but after a period of time has a similar problem, it should be the DNS problem, DNS resolution is not stable? Maybe! So changed the default DNS, changed to Google provides a global public DNS resolution server, under Linux

A method that can be called to build a path with a configuration:Tap Project 1, right click, choose Build Path (build route)-> Configure Build Path ... (Configure build path ...)Then select Project (Project) in the pop-up windowThe hint is: "The import ... is never used" ("Never use imported ... ")?It should be a warning, because although you cited this package or class, but did not use, warning does not affect the operation, you can use CTRL + Shift + O to automatically remove the unused refere

("Redis.pool.testOnBorrow"));//private static Jedispool Jedispool = null;private stat IC ResourceBundle res = resourcebundle.getbundle ("Redis");p rivate static Logger log = Logger.getlogger (Redisutil.class) ; private static String password; private static Jedissentinelpool Jedispool; static {try{string[] servers = res.getstring ("Redis.sentinels"). Split (","); int maxtotal = Integer.parseint (res.getstring ("Redispool.maxtotal")); int maxidle = Integ

1. Create a new app on Heroku2. After successful creation, add support for MySQL, click Find more Add-ons3. I chose Jawsdb Mysql here.4. We can view the configuration of the database after the successful addition5. Then connect to the remote database locally via MySQL Workbench and execute the appropriate SQL statement to create the database and table required by the application6. Then we need to change the settings of the database connection file in the Web project to the corresponding configur

Web projects sometimes experience the need to dynamically generate zip and download, but we do not want to generate redundant temporary files when generating zip files. Below will Introduce my way of handling. There are improper places also hope that everyone criticized the advice. This requirement is described as follows:1. Generate XML files dynamically based on data2. Package a dynamically generated XML file (one or more) into a zip file3. After

file, the following dialog box is displayed. After you select the export path, finish by default. However, note the following two points: The JVM parameter you set in the run configuration does not take effect after it is packaged. You need to specify it in the command line when executing the jar (see figure 4 ); There are three processing methods for third-party packages. No matter which one does not affect your use, I use the first one by default, he will decompress the third-party

II. Ant Key elementsAnt component files are written based on XML. The default name is build. xml. To better understand ant, write a simple ant program here to show ant functions and give readers a preliminary understanding of ant. First, create a build. xml file under the e drive. The content is as follows: You can enter the E drive and run ant sayhelloworld. The following running result is displayed: Sayhelloworld indicates the name of the task t

server hangs, Dynamic Web page goodbye! And to run a static web page publisher, I believe we all know that the configuration is not too high, right? Oh.Therefore, I think it is feasible to generate static pages.So how to generate static Web page code of Dynamic Web page? And where does it exist? The principle is actually very simple. 1, using Freemark template to generate static pages, search the Internet a lot of code with you pick, I am not here wo

Docker, the open-source Docker container makes deployment lightweight, and it's easy to expand a node that can be used for scenarios with high concurrency and high scalability requirements. The advent of Docker can be fully implemented with one-click Deployment. Whether load balancing is required, you can choose a hard load (the F5 mentioned above), or you can use a soft load (nginx). The soft-load scheme can be simple, apache+tomcat, need to conside

Xiaokang will accompany you to learn JAVA -------- simple JAVA program, java -------- java Analyzes a simple and complete JAVA program Example: TestJava2_1.

beginners I do not recommend the use of "thinking in Java", I recommend the Prentice Hall PTR "core Java 2" in the country called "Java 2 core technology", is currently the seventh edition. On the Internet, everyone can download to the electronic version. OReilly's "Java In a Nutshell" is also a good choice. After rea

A simple understanding of Java exceptions and a simple understanding of JavaWhat is the essence of Java exceptions? Essentially, a java exception is a java Object (inheriting objects). Like a general

A simple java chat room and a simple java chat room Using the group chat room compiled by java Socket, you can copy it and try it on your own Server: Package net3; import java. io. bufferedReader; import

Call stack panel displays the program's call stack, where you can jump freely in the captured call path. Multithreaded debugging is also supported through and stacks. Debug console-You can see standard output and error output information from the Debug console. Official documents:The Java support in VS Code are provided through extensions and optimized for lightweight Java

Simple paging in Java Web, simple paging in Java Web This article mainly explains how to paging the data obtained after logon. First, we create a login page login. jsp, because we mainly learn about paging, the login verification section is not described. The main code is as follows: 1 First, create the object class U

[Simple Java] Access Control and simple permission Control for Java members Access Control in Java includes two parts: Class access permission Control Access permission Control for Class Members For a class, the access permission control modifier can be public or n

A simple use of reflection in Java and a simple use of Java reflection Repeat the previous technical articles in other places to help you remember and learn from others. I sent such a piece of code at work: package cn.com.hanbinit.test; import java.lang.reflect.Field;import java.util.ArrayList;import java.util.List; pu

instantiate it by reflection. The opening of the extension is achieved, while the closure of the modification is ensured. Readers familiar with spring should think of the spring IOC implementation.Annotations make simple Factory mode not simpleIn the example above, the reflection was used to open the extension and close the modification. Sometimes, however, it is not convenient to use the full name of the class, and it is more appropriate to use alia

The java environment and tomcat deployment process on the centos server and the simple modification of mysql, and the simple modification of centos This document describes how to deploy java and tomcat and modify the mysql database of the olds website system after centos is installed. The red part indicates the actual

Java design pattern (1) simple factory pattern is not simpleSimple factory Use Cases There is an abstract product-Car, and there are a variety of specific sub-products, such as BenzCar, BMWCar, and LandRoverCar. The class diagram is as follows: As a driver, if you want to drive one of them, such as BenzCar, the most direct way is to directly create the BenzCar instance and execute its drive method, as follo