Spring Cloud Spring Boot mybatis distributed micro-service Cloud Architecture (i) Quick start

Quick Start

The main objective of this chapter is to build the Spring Boot Foundation project and implement a simple HTTP request processing, which gives a preliminary understanding of spring boot and experiences its simple structure and rapid development.

System Requirements:

• Java 7 and above
• Spring Framework 4.1.5 and above

This article adopts Java 1.8.0_73 , Spring Boot 1.3.2 debugging passes.

Building projects with Maven

1. SPRING INITIALIZRcreating basic projects with tools
   1. Access:http://start.spring.io/
   2. Select the Build tool Maven Project , Spring boot version, 1.3.2 and some engineering basics to refer to the spring INITIALIZR
   3. Click to Generate Project download the project compression package
2. Unzip the project package and use the IDE to Maven import the project as an IntelliJ IDEA 14 example:
   1. menu, select File –> New –>Project from Existing Sources...
   2. Select the extracted Items folder and clickOK
   3. Click Import project from external model and select Maven , and click to the Next end.
   4. If you have multiple versions of the JDK in your environment, please select the Java SDK above version when you choose Java 7

Project Structure Analysis

Project structure

The following steps complete the creation of the base project, as shown in the Spring boot infrastructure with a total of three files (the exact path varies according to the group all the differences that the user fills in when the project is generated):

• src/main/javaUnder the program entry:Chapter1Application
• src/main/resourcesThe following configuration file:application.properties
• src/test/Test entry under:Chapter1ApplicationTests

Both the generated Chapter1Application and Chapter1ApplicationTests class can run directly to start the currently created project, and because the project is currently not mated to any data access or Web modules, the program ends up running after the spring has finished loading.

Introducing the Web Module

The current pom.xml content is as follows, with only two modules introduced:

• spring-boot-starter: core modules, including automatic configuration support, logs, and Yaml
• spring-boot-starter-test: Test modules, including JUnit, Hamcrest, Mockito

  1. <dependency> <groupId>org.springframework.boot</groupId> <artifactId> spring-boot-starter-test</artifactid> <scope>test</scope> </dependency> </dependencies >

• To introduce a Web module, you need to add a spring-boot-starter-web module:

  1. <dependency> <groupId>org.springframework.boot</groupId> <artifactId> Spring-boot-starter-web</artifactid> </dependency>

  
  Writing HelloWorld Services
• Create package a named com.didispace.web (modified according to the actual situation)
Create

HelloController

class, the contents are as follows

 Public class Hellocontroller {   @RequestMapping ("/hello"public      return "Hello World";}} 

Start the main program, open the browser access http://localhost:8080/hello , you can see the page outputHello World

• Writing Unit Test Cases

  Open the src/test/ test entry class under Chapter1ApplicationTests . The following is a simple unit test to simulate an HTTP request, as follows:

  1. @RunWith (Springjunit4classrunner.class) @SpringApplicationConfiguration (Classes= Mockservletcontext.class) @WebAppConfiguration Public classchapter1applicationtests {PrivateMOCKMVC MVC; @Before Public voidsetUp () throws Exception {MVC= Mockmvcbuilders.standalonesetup (NewHellocontroller ()). build (); } @Test Public voidGethello () throws Exception {Mvc.perform (mockmvcrequestbuilders.Get("/hello"). Accept (Mediatype.application_json)). Andexpect (Status (). IsOk ()). Andexpect (Content () .string(Equalto ("Hello World"))); }   }

• Use MockServletContext to build an empty one WebApplicationContext so that we can create HelloController it @Before and pass it to the function in the function MockMvcBuilders.standaloneSetup（） .

• Note that the following content is introduced to make, status content and equalTo function available

  1.  staticstatic static Org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

• Now that the goal has been completed, a blank spring boot project has been built through MAVEN, and a simple request processing is implemented by introducing a Web module.

Spring Cloud Spring Boot mybatis distributed micro-service Cloud Architecture (i) Quick start