http://crunchify.com/simplest-spring-mvc-hello-world-example-tutorial-spring-model-view-controller-tips/ 非常棒的spring入门，maven，以及eclipse

Simplest Spring MVC Hello World Example / Tutorial – Spring Model – View – Controller Tips

Last Updated on 9 September, 2016 by App Shah 285 Comments

Do you have any one of below question?

Developing a Spring Framework MVC 4 application step-by-step..
java – Spring MVC tutorial from the scratch
Spring MVC Fast Tutorial
Spring MVC Framework Tutorial
First Spring MVC application tutorial
Spring 4 MVC Tutorials, AJAX Demo, jQuery Demo, JavaScript Demo, Tips & Tricks Spring 4 MVC

Then you are at right place. Here I’ll demonstrate simple Spring MVC framework for building web applications.

First thing first – Let’s Setup Environment

I’m using below tools which you may need to download if you don’t have already.

Tomcat 8.0.37 – Download latest Apache Tomcat from this link.
Make sure you download Eclipse IDE for Java EE Developers (Neon v4.6) – Download link. (diagram below)
Spring 4.3.1 (No download required) – we will use Maven dependency.
JDK 1.8 – Download link.

Make sure you download Java EE:

Main goal for this tutorial to create Spring MVC Application in the simplest way. This is how our application result will look like. This is a final result once you complete all below steps.

Here is a final result: Welcome page ==> index.jsp

Result returns from Controller Class ????

Now Let’s get started on Tutorial

Step-1

Open Eclipse
Create New Eclipse Workspace – This is must to avoid any existing workspace config issue.

Step-2

Click on File
Click on New
Choose Dynamic Web Project
One popup window, Provide Project Name: CrunchifySpringMVCTutorial
Make sure you use Target Runtime as Apache Tomcat 8.0. If you don’t see Target Runtime then follow these steps.

Step-3

Convert Project to Maven Project to add all required Spring MVC dependencies to project.

Steps:

Right click on project
Configure
Convert to Maven project

Step-4

Open pom.xml file and add below jar dependencies to project.

Here is my pom.xml file. Make sure you update Java version to 1.7 if you haven’t yet moved to JDK 1.8.

Step-5

Create new Spring Configuration Bean file: /WebContent/WEB-INF/crunchify-servlet.xml

http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/mvc

http://www.springframework.org/schema/mvc/spring-mvc.xsd

http://www.springframework.org/schema/context

In the above crunchify-servlet.xml configuration file, we have defined a tag <context:component-scan> . This will allow Spring to load all the components from package com.crunchify.controller and all its child packages.

This will load our CrunchifyHelloWorld.class . Also we have defined a bean viewResolver. This bean will resolve the view and add prefix string /WEB-INF/jsp/ and suffix .jsp to the view in ModelAndView. Note that in our CrunchifyHelloWorld class, we have return a ModelAndView object with view name welcome. This will be resolved to path /WEB-INF/jsp/welcome.jsp .

Step-6

Create new file web.xml. Map Spring MVC in /WebContent/WEB-INF/web.xml file.

NOTE: if you don’t see web.xml file in your “dynamic web project” then follow these steps.

DispatcherServlet

The above code in web.xml will map DispatcherServlet with url pattern /welcome.jsp. Also note that we have define index.jsp as welcome file.

One thing to note here is the name of servlet in <servlet-name> tag in web.xml. Once the DispatcherServlet is initialized, it will looks for a file name [servlet-name]-servlet.xml in WEB-INF folder of web application. In this example, the framework will look for file called crunchify-servlet.xml.

Step-7

Create Controller Class.

Right click on Java Resources -> src
Click New -> Class
Package: com.crunchify.controller
Filename: CrunchifyHelloWorld.java

;

* author: Crunchify.com

@Controller

{

)

{

;

}

Note that we have annotated the CrunchifyHelloWorld class with @Controller and @RequestMapping("/welcome"). When Spring scans our package, it will recognize this bean as being a Controller bean for processing requests. The @RequestMapping annotation tells Spring that this Controller should process all requests beginning with /welcome in the URL path. That includes /welcome/* and /welcome.html.

The helloWorld() method returns ModelAndView object. The ModelAndView object tries to resolve to a view named “welcome” and the data model is being passed back to the browser so we can access the data within the JSP. The logical view name will resolve to /WEB-INF/jsp/welcome.jsp . Logical name “welcome” which is return in ModelAndView object is mapped to path /WEB-INF/jsp/welcome.jsp.

The ModelAndView object also contains a message with key “message” and Detailed value. This is the data that we are passing to our view. Normally this will be a value object in form of java bean that will contain the data to be displayed on our view. Here we are simply passing a string.

Step-8

The View – Create new file /WebContent/index.jsp.

{

;

}

</style>

)

Create another file /WebContent/WEB-INF/jsp/welcome.jsp.

NOTE: Don’t forget to create jsp folder and put welcome.jsp inside that ????

MVC

{

;

}

</style>

}

After everything this is how your workspace should look like.

Step-9

Right Click on Project -> Run As -> Maven Build...

Add Goals: clean install. Click Apply and Run.

You should see build success message:

Where are all of my .jar files?

You will see all .jar files under /target folder. Screenshot.

Step-10

If you don't see Tomcat Server in Servers tab then follow steps to add Apache Tomcat to Eclipse.
Deploy project to Apache Tomcat and start tomcat.

Make sure you see below logs. That means your application is successfully deployed on Tomcat Web Server.

Step-11

Visit: http://localhost:8080/CrunchifySpringMVCTutorial/ and you should be all set.

Hurray.. Now you know Hello World Spring MVC 4 Example. Let me know if you encounter any exception while running this. There are lot more example you can find here.

Do you want to include JS, CSS and images into JSP file? Follow this tutorial: Best way to Add/Integrate JS, CSS and images into JSP file using ‘mvc:resources mapping’.

Having trouble? Any issue?

Triaging Step-1 – Having HTTP Status 404 error?

Also, follow below tutorial:

Triaging step-2 – URL doesn’t work? Tomcat error?

Make sure you add Apache Tomcat Server to Targeted Runtime. Which you may have selected in Step-1. Tomcat 7 or 8 any – server should work.

Triaging Step-3 – maven errors?

Make sure to update all maven dependencies.