/SimpleJ2EEProject

Simple java 2 EE project fro TI karazin java course

Primary LanguageJava

Lab project skeletons

Practice task:

  • Fork SimpleJ2EEProject
  • Create git branch "newServlet"
  • Create HttpServlet and map to "/" (use BaseHttpServlet which is in project) and commit changes
  • Get instance of HelloWorldGenerator from context BaseHttpServlet.getBean() and print it in page (use htm page structure), commit
  • Change HelloWorldGeneratorImpl hello text to "Hello world", commit
  • Push changes to remote
  • Checkout master
  • Create new branch "newHelloText"
  • Change HelloWorldGeneratorImpl hello text to "Hello visitor", commit
  • Push changes to remote
  • Checkout master
  • Merge branch newHelloText to master, push
  • Merge branch newServlet to master, push
  • run "mvn package" and Deploy web-app.war to tomcat
  • Connect to tomcat debug port
  • create breakpoint in servlet
  • Change hello text from debug to "broken Hello"
  • Show result to lecture

Project manual

Lecture Materials

SimpleJ2EEProject

Simple java 2 EE project fro TI karazin java course

  • Set up GitHub account
  • Import project
  • Set up simple web project (1 servlet)
  • Make commit/push
  • Make branch/merge
  • Debug Servlet"

https://start.spring.io/

Practice task 2:

  1. Dowload and Import new spring project

    1. Open https://start.spring.io/
    2. Select maven spring boot project with version 1.5.8
    3. Search for dependency named "Web" and add it
    4. Click Generate project
    5. Unzip
    6. Import as new maven project
    7. Wait when all dependecies will be resolved
    8. Check tha you have DemoApplication.java file

  2. Create Controller

    1. Check required dependencies in pom.xml (wait for resolving dependencies after any pom.xml updates before start application) 
      <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-tomcat</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
</dependency>
    2. Create class NewController
    3. Mark class with @RestController Annotation
    4. Create Method 
      public String index(){
    return "<html><body><h1>Hello</h1></body></html>";
}
    5. Mark method with following annotation 
      @RequestMapping(value = "/index.html", method = RequestMethod.GET)
    6. Check that you have right imports 
      import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
    7. Run DemoApplication.main()
    8. Check result http://localhost:8080/index.html

  3. Spring boot configuration

    1. Find file /src/main/resources/application.properties
    2. Put following config 
      server.port=8081
    3. Chek results on new port
    4. Add following config to /src/main/resources/application.properties 
      custom.message=Hello My friend
    5. Add Filed and constructor to your controller 
      private final String msg;

public NewController(@Value("${custom.message}") String msg) {
    this.msg = msg;
}
    6. Pay Atentions on following code in construictor. (It is injection of value from config files) 
      @Value("${custom.message}") String msg
    7. Change your method to dispaly variable "msg" on yopur page 
      @RequestMapping(value = "/index.html", method = RequestMethod.GET)
public String index(){
    return "<html><body><h1>" + msg + "</h1></body></html>";
}
    8. Check results