Shulou(Shulou.com)06/01 Report--

Summary: technology selection (only part of the technology is listed) service framework: Dubbo, zookeeper, Rest service cache: Redis, ehcache message middleware.

Preface

This article introduces how to use eclipse to build the minimum system of SpringMVC step by step, the so-called minimum system is enough to make the project run successfully under the SpringMVC framework, and can do some simple things (such as visiting pages).

Without much to say, let's get started. All source code and jar packages will be given at the end.

Other environments:

Operating system: Windos 10

Tomcat: v7.0

JDK: 1.7

Technology selection (only part of the technology is listed)

1. Backend

Service framework: Dubbo, zookeeper, Rest services

Cache: Redis, ehcache

Message Middleware: ActiveMQ

Load balancing: Nginx

Distributed files: FastDFS

Database connection pooling: Alibaba Druid 1.0

Core framework: spring framework

Security framework: Apache Shiro 1.2

View frame: Spring MVC 4.0

Server verification: hibernate Validator 5.1

Layout framework: SiteMesh 2.4

Workflow engine: Activiti 5.15

Task scheduling: quartz 1.8.5

Persistence layer framework: MyBatis 3.2

Log management: SLF4J 1.7, Log4j

Utility classes: Apache Commons, Jackson 2.2, Xstream 1.4, Dozer 5.3, POI

2. Front end

Js framework: jQuery 1.9.

CSS framework: Bootstrap 4 metronic

Client authentication: jquery Validation Plugin.

Rich text: CKEcitor

File management: CKFinder

Dynamic tabs: Jerichotab

Data sheet: jqGrid

Dialog box: jQuery jBox

Tree structure control: jQuery zTree

Other components: Bootstrap 4 metronic

3. Support

Server middleware: Tomcat 6, 7, Jboss 7, WebLogic 10, WebSphere 8

Database support: currently only provide support for MySQL database, but not limited to database, the next version upgrade multi-data source switching and database read-write separation: such as: Oracle, SqlServer, H2, etc.

Support development environment: Eclipse, MyEclipse, Ras, Idea, etc.

Classic introduction:

Source structure

More detailed source code reference sources

Text 1. Create a new project

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We create a new project with eclipse and select Dynamic Web Project (dynamic Web project).

Click Next

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Write springmvc in Project name, which is the name of our project. Do not change anything else, just click Finish.

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OK, the project will be completed.

Next, be sure to change the character set of the project to UTF-8

Right-click the project-properties

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Change to UTF-8 and click OK.

two。 Write web.xml

When we open the WebContent/WEB-INF directory, we find that there is only one lib directory inside, which is where all kinds of jar packages are stored. We know that a web project must have a web.xml file.

Since we don't have one, let's write one ourselves.

Right-click WEB-INF--new--file and create a new web.xml file.

Click Finish

Just fill in the following.

Springmvc

This completes the basic configuration. I mean, this project is now a standard web project.

3. Verify that the web project is built successfully

To verify the correctness so far, we create a new jsp file under the WebContent directory.

His name is index.jsp.

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The contents are as follows:

Congratulations, the web project has been successfully built!

Let's deploy this project to Tomcat now to verify that it can be run.

Right click on the project-- Debug As--Debug on Server

Click Finish directly

After a while, the console starts printing log messages, and when we see these messages, it means that Tomcat has been started.

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Let's open the browser and enter the following information in the address bar

Http://localhost:8088/springmvc/index.jsp

The port number of Tomcat on my computer is 8088, depending on your own Tomcat, it may be 8080 and so on.

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It can be seen that we have been able to successfully visit the page, which shows that what we have done so far is correct.

3. Integrated SpringMVC

We add the following configuration to the web.xml file

3.1 configure listeners

Org.springframework.web.context.ContextLoaderListener

Org.springframework.web.util.IntrospectorCleanupListener

3.2 configure the filter to solve the POST garbled problem

Encoding

Org.springframework.web.filter.CharacterEncodingFilter

Encoding

UTF-8

Encoding

/ *

3.3 configure a SpringMVC dispatcher to intercept all requests

Springmvc

Org.springframework.web.servlet.DispatcherServlet

Namespace

Dispatcher-servlet

Springmvc

/

In this configuration, we specify that the name of the associated XML file for DispatcherServlet is dispatcher-servlet.

Note that the path here is relative to web.xml, that is, the file is also in the root directory of WEB-INF.

So, we need to create a new dispatcher-servlet.xml file in the root directory of WEB-INF.

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At this point, the preparation of the web.xml file is over.

3.4.Writing dispatcher-servlet.xml

The purpose of dispatcher-servlet.xml is to configure the SpringMVC dispatcher.

The configuration is as follows:

According to the configuration, there are three points to pay attention to.

It scans all the Java classes under the com.springmvc package, but whenever it encounters annotations, such as @ Controller, @ Service, @ Autowired, it adds them to Spring's bean factory.

All static resource files, such as js, css, and p_w_picpaths, need to be placed in the / resources directory, which we haven't built yet.

All display pages, such as jsp files, need to be placed in the / WEB-INF/pages directory, which we haven't built yet.

OK, let's add the corresponding directory.

The first is the directory of the Java file.

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We right-click in this place, create a new com package, and then build a springmvc package in it, or use. The way to build it together.

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Click Finish

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According to the layering of SpringMVC, we build three packages under the springmvc package, namely controller, service, and dao.

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In this way, once our project is started, springmvc will scan the three packages, extract all the annotated classes inside, put them into the Spring container (or Spring's bean factory), and manage them uniformly through the Spring container. That's why you've never been to new a Controller.

Next, let's create a directory of static resources.

Create a new resources folder under the WebContent directory.

Then, by the way, set up all the js,css,img folders, and here we store our static resource files.

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Finally, we create a pages folder under the WEB-INF directory as the directory where the display pages are stored.

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Copy in the previous index.jsp.

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This is almost done with the configuration.

5. Package guidance and verification

We put the jar package in the lib directory:

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Then start the project to verify that the build so far is correct.

Open the Servers view and click on the icon as if the image is a beetle.

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It is found that there is an error. The error message is as follows:

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Error:

Could not open ServletContext resource [/ WEB-INF/applicationContext.xml]

It says that we are missing an applicationContext.xml file under WEB-INF. It turns out that we have lost the configuration of the SpringBean factory, which means that we have to specify what needs to be loaded automatically when the Spring container starts.

So, we add applicationContext.xml.

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We don't configure anything inside, start Tomcat again.

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Don't make a mistake this time.

5. Configure ViewController

We know that any resource in the WEB-INF directory cannot be accessed directly through the browser's url address, which ensures security. That's why we put all the pages in this directory.

To make a difference, we also set up a separate pages folder to save these pages.

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Now, in order to access this page, we need to use SpringMVC's page jump mechanism.

We create a new ViewController under the Controller package.

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Click Finish

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ViewController Code:

Package com.springmvc.controller;import javax.servlet.http.HttpServletRequest;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;@Controllerpublic class ViewController {@ RequestMapping ("/ view")

Public ModelAndView view (HttpServletRequest request) {

String path = request.getParameter ("path") + ""

ModelAndView mav = new ModelAndView ()

Mav.setViewName (path); return mav

}

}

I just need to put the page I want to visit in path and pass it in through url.

Because the java class is added, we restart Tomcat.

When the startup is complete, enter:

Http://localhost:8088/springmvc/view?path=index

Results:

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It doesn't matter. Let's see what he says is wrong.

Message / springmvc/WEB-INF/pagesindex.jsp

What the hell is pagesindex.jsp?

It turns out that we are missing a "/" in dispatcher-servlet.xml.

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Just add it.

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After saving, we still need to restart Tomcat because we modified the XML configuration file.

After the startup is complete, continue!

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Succeed.

6. Introduce static resources

For example, if I put a picture in the resources/img directory, how can I introduce it to index.jsp?

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Background: url (http://localhost:8088/springmvc/resources/img/bg.jpg);background-size: 100%

Indeed, this is one way. However, one drawback is that the root path is dead, and we certainly don't want that.

In fact, we can get the project root path in viewController and pass it to the jsp page to OK.

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We put the debugging message "Congratulations, the web project has been successfully built!" Delete.

Body {background: url (${contextPath} / resources/img/bg.jpg); background-size: 100%

}

${contextPath} can get the contextPath value passed by Controller.

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