sombrewolf/lab_004

TP Lab_004 de JEE

Lab 04

Intro

Several goals for this homework:

• It is based on the previous practice (code + database)
• You will create a MVC architecture with Spring WebMVC
• You will write some logs

DB

• Reuse the schema named junia_lab03
• We assume that your DB credentials are root:root

lab04-web

Dependencies

Create a new Maven module called lab04-web. Its packaging is war

For this module, you have to declare, in the pom.xml file, the following dependencies.

groupId	artifactId	version
${project.groupId}	lab04-core	${project.version}
org.springframework	spring-webmvc	5.1.9.RELEASE
org.springframework	spring-context-support	5.1.9.RELEASE
org.apache.velocity	velocity	1.7
com.shield-solutions	spring-velocity-adapter	1.0.0.RELEASE
org.webjars	bootstrap	3.3.7-1
ch.qos.logback	logback-classic	1.2.3

For this module, we won't write any web.xml file, because everything will be configured with Java

Initializer

In the junia.lab04.web package, create a class named Initializer which extends AbstractAnnotationConfigDispatcherServletInitializer (hey, that's what I call an accurate name!)

3 methods to implement:

• getRootConfigClasses() which returns an array filled with AppConfig and DBConfig, theses classes are provided by the core module.
• getServletConfigClasses() which returns an array filled with WebConfig, a class you will write later.
• getServletMappings() which returns a String array with the following entry : "/"

If you wonder how to create arrays in Java, check this out : http://mathbits.com/MathBits/Java/arrays/Initialize.htm

WebConfig

In the junia.lab04.web.config package, create the WebConfig class which implements WebMvcConfigurer.

• Annotate this class with @EnableWebMVC in order to start Spring WebMVC.
• Annotate this class with @Configuration
• Annotate this class with @ComponentScan and configure this annotation to tell Spring to check the junia.lab04.web.controller package.
• Override the addResourceHandlers with the following code : registry.addResourceHandler("/webjars/**").addResourceLocations("/webjars/");
• Declare a bean of type VelocityConfigurer
  • "/WEB-INF/velocity" is the path you should pass to the setResourceLoaderPath method of that bean.
• Declare a bean of type VelocityViewResolver
  • ".vm" is the suffix configured in that bean (check the available methods of that bean)

CompanyController

In the junia.lab04.web.controller package, create the CompanyController class.

• Annotate this class with @Controller
• Inject the CompanyService
• Create a method getListOfCompanies
  • it takes a parameter of type ModelMap
  • it returns a String
  • its implementation is quite simple, it loads all the companies from the DB with findAllWithProjects method from the service, puts it in the modelMap with the key companies then returns "companiesList" (it will load the provided template in src/main/webapp/WEB-INF/velocity/companiesList.vm)
  • annotate this method in order to map this method with the current HTTP Request info:
    • path : /list
    • verb : GET

Check the provided files in the resources directory of that practice. Copy the files where they should be ;)

Deployment

Deploy your app in a Tomcat then test your page!

Let's continue

CompanyController

Create a getForm method which returns a String and takes a ModelMap parameter

• create a new instance of Company then stores it in the map.
• return "companyForm"
• add the correct annotation in order to map this method to the /form URL.

Create a submitForm method

• it returns a String
• it takes a Company parameter, annotated with @ModelAttribute("company")
• it saves the company in the DB
• it returns "redirect:list (remember the "redirect after submit" pattern?)
• annotate this method with @RequestMapping with the /form path and the POST HTTP method.

Deployment

Deploy your app in a Tomcat then test your form.

Let's continue

CompanyController

Because you are a smart student, read the HTML template of the "trash" button then implement the deletion of a company, followed by a refresh of the list.

Logs

Inside the src/main/resources directory of the web module, paste the logback.xml file then check how the logs are formatted. Do not hesitate to play with this config to understand the concept of logging. You can also add some logging in your code.