java practice projects

1, Java is a cross-platform, there is a problem in Linux, the main one is the file Read permission; The system environment variable setting under two checks can be!.profile correctlyJavaweb_ Deploy the Javaweb project developed on the Windows platform to the Linux platform steps: 1. On the Windows platform, package the project into a. war file by MyEclipse "file", "Export", 2, On the Windows platform, deleting. jar files in the. war file that are dupl

When using Android studio to compile into a jar, encountered gradle compilation errors, listen to the predecessors said that the JDK version is incorrect, and then updated the JDK, but maybe I reinstalled the JDK when the installation path changedConfigure the path in project structure, but still error: Gradle compile Java project times wrong: Could not find Tools.jarThis is because Gradle cannot find the JDK directory and can be resolved by setting t

the sql+mybatis logic tag.Logical label Understanding how people have used the template language freemarer or velocity should be easy to understand, that is, custom rules tagsHibernate is a bit more advanced, and it's simple, he uses annotations or configurations to configure entity and table fields in a way that dynamically generates SQL at startupYou can look at the open source project Minidao, you will know that the persistence layer originally written is very simple;So the architecture can

choice, such as the need to rely on the separation from the jar, the software can be started in *nix and Windows Script, and so on. Then use the Gradle application plugin to do it.In the Gradletest project, we made the following modifications to the SubPro1 build.gradle: Delete the jar task, add the application plugin, and configure the main class (the value of the Mainclassname is set). The result of the modification is as follows:apply plugin: ‘application‘mainClassName = ‘hello.HelloWorld‘de

1. Download Jettywget http://central.maven.org/maven2/org/eclipse/jetty/jetty-distribution/9.4.1.v20170120/ Jetty-distribution-9.4.1.v20170120.tar.gz2. Unzip the compressed fileTAR-ZXVF jetty-distribution-9.4.1.v20170120.tar.gz3. Setting the jetty Access portVim Start.iniHere I set the access port to 88884. Upload the war package to the WebApps directory5. Start JettyNohup java -jar start. Jar (running in the background) 6. Access AddressThe appea

Recently good busy good busy, sorting out the mood for everyone to share under their work encountered a little skill, hope to meet the same trouble students a little help. We know that the Java Project War package can be automatically packaged in the Eclipse and MyEclipse tools, right, and then export the war package, but I found that one of my projects was a little bit of a hassle during the war package,

class:Package Cn.outofmemory.helloannotation;import Org.springframework.context.applicationcontext;import Org.springframework.context.annotation.annotationconfigapplicationcontext;import Org.springframework.context.support.classpathxmlapplicationcontext;public class App {public static void main ( String[] args) { //applicationcontext appContext = new Annotationconfigapplicationcontext (" Cn.outofmemory.helloannotation "); Note: Spring fetch beans can be obtained by type, by name, by t

configure the SSH key pair, configured as follows:This assumes that host a (192.168.100.3) is used to obtain a file for Host B (192.168.100.4).Execute the following command on host A to generate the pairing key:SSH-KEYGEN-T RSAWhen prompted to enter the default, the public key is stored in the user directory. The SSH directory, such as root, is stored in:/root/.ssh/id_rsa.pubCopy the Id_rsa.pub file from the. SSH directory to the ~/.ssh/directory in Host B and rename it to Authorized_keys.Execu

main function is to instantiate the implementation class object and return the object to invoke the method to implement the business logic operation. The factory class ensures that even modifying the methods in a class does not affect other classes when the system is maintained at a later time.⑧ constructs a exception that defines a class that specializes in handling exception handling exceptions at run time in the system.⑨ defines a controller package that defines the control classes that are

How to publish Java Web projects on windows to Centos, javawebcentos First, import the project to the myeclipse or eclipse (JEE) version on windows, After debugging, there is no error. Click project, right-click Export (Export ...) Then select the JEE war format, which is the compressed format, To run a program on Centos, you must package it into a war format. Then we will package it .. War, which is

1. Archive for Required library: ' Webcontent/web-inf/lib/readme.txt ' in Project ' xxxxxxxxx ' cannot being read or is not a Val ID ZIP File2. The project cannot be built until build path errors is resolved3. Target Runtime Apache Tomcat v6.0 is not defined.These three problems are well resolved, as follows:1. Open the. classpath file in the project root directory with Notepad and locate the "2. Once the first problem is resolved, this problem will also disappear3. Open the Org.eclipse.wst.comm

Cache" + key + "'.", e);}}public void setexpiredtime (int expiredtime) {This.expiredtime = ExpiredTime;}public void Setmemcachedclient (Memcachedclient memcachedclient) {This.memcachedclient = memcachedclient;}Private Memcachedclient memcachedclient;private int expiredtime = 60 * 120;Private static final Log log = Logfactory.getlog (Memcached.class);}Configuring cache-related class relationships and attributes in ApplicationContextThe role of specific properties can be referred to the official

Google http://www.googto.com/1. FormsHere, the action in the form cannot take "/", without/representing the relative path, with "/" for absolute path, must be written/project name/url. 2, Web. XML configuration There must be a/in the url-pattern here, or it will error java.lang.IllegalArgumentException:Invalid 3. Logincontroller rewrite Dopost and Doget codeReference W3cschool in the servlet tutorialHttp://www.runoob.com/servlet/servlet-form-data.htmlPublicclasslogincontrollerextendshttpservlet

@Controller@RequestMapping (value = "API")public class Apiitemcatcontroller {@AutowiredPrivate Itemcatservice Itemcatservice;@RequestMapping (method = Requestmethod.get)Public responseentitytry {Invoking service queriesItemcatresult result = Itemcatservice.queryitemcatall ();Objectmapper mapper = new Objectmapper ();String Jsonresult = mapper.writevalueasstring (result);To determine whether a cross-domain requestif (Stringutils.isnotempty (callback)) {Return Responseentity.ok (callback + "(" +js

Objective:The Java project is put into a jar to run on Linux, but Linux does not have eclipse to debug, so remote debugging in Windows Eclipse.need to pay attention to IS!!! after eclipse hits the jar, put it in the Lib directory in the Linux environment, make sure the code is consistent two times, and then start the. SH in Linux, and you will be prompted to listen to the port and debug in Eclipse.The execution script in Linux, which focuses on the se

1. Create the Javaweb project in MyEclipse Antdemo2. Place the build.xml in the Antdemo root directory3. Modify project name, project directory name, project name, and Tomcat path in Build.xml4. Right-click->properties->builders-> to create a new build, pointing to the build.xml you just created5. Check Build.xml->run as Ant Builder is OK.Ant Script Build.xmlAnt compiles and deploys Java Web projects

("") obtains an absolute URI that is also the current classpath. (5). Classloader.getsystemresource ("") obtains an absolute URI that is also the current classpath. Try not to use relative paths to the current user directory compared to System.getproperty ("User.dir"), which can be seen in a variety of results. (6) New File (""). GetAbsolutePath () is also available. Note: If there are spaces in these paths, and the spaces are substituted, you can use Path = Java.net.URLDecoder.decode (pat

1. Download the Mybatis-spring.jar package.2. Configure the spring and mybatis environments.3. In the project I use Sqlsessionfactorybean to instantiate each interface. The specific configuration file code is as follows:BeanID= "Sqlsessionfactory"class= "Org.mybatis.spring.SqlSessionFactoryBean"> Propertyname= "DataSource"ref= "Jdbcdatasource"/> Propertyname= "Configlocation"value= "Classpath:/mybatis-config.xml"> Property> - Bean> BeanID= "Usermapper"class= "Org.mybatis.

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