关于springboot:Spring-Boot-教程服务组件

【注】本文译自： https://www.tutorialspoint.co...

  服务组件是蕴含 @Service 注解的类文件。这些类文件可用在与 @RestController 类文件所不同的层来编写业务逻辑。创立服务组件类文件如下所示：

public interface ProductService {}

  以 @Service 注解实现接口的类如下所示：

@Servicepublic class ProductServiceImpl implements ProductService {}

  回顾以前的教程中，咱们应用产品服务 API(s) 来存储、获取、更新和删除产品。咱们在 @RestController 类文件本身中编写业务逻辑。当初咱们要把业务逻辑代码从控制器移到服务组件。
  你能够创立一个接口，蕴含减少、编辑、获取和删除办法，示例代码如下：

package com.tutorialspoint.demo.service;import java.util.Collection;import com.tutorialspoint.demo.model.Product;public interface ProductService {   public abstract void createProduct(Product product);   public abstract void updateProduct(String id, Product product);   public abstract void deleteProduct(String id);   public abstract Collection<Product> getProducts();}

  以下代码将让你创立一个以 @Service 注解来实现 ProductService 接口的类，用以编写存储、获取、删除和更新产品。

package com.tutorialspoint.demo.service;import java.util.Collection;import java.util.HashMap;import java.util.Map;import org.springframework.stereotype.Service;import com.tutorialspoint.demo.model.Product;@Servicepublic class ProductServiceImpl implements ProductService {   private static Map<String, Product> productRepo = new HashMap<>();   static {      Product honey = new Product();      honey.setId("1");      honey.setName("Honey");      productRepo.put(honey.getId(), honey);      Product almond = new Product();      almond.setId("2");      almond.setName("Almond");      productRepo.put(almond.getId(), almond);   }   @Override   public void createProduct(Product product) {      productRepo.put(product.getId(), product);   }   @Override   public void updateProduct(String id, Product product) {      productRepo.remove(id);      product.setId(id);      productRepo.put(id, product);   }   @Override   public void deleteProduct(String id) {      productRepo.remove(id);   }   @Override   public Collection<Product> getProducts() {      return productRepo.values();   }}

  以里的代码展现了 Rest Controller 类文件，咱们用 @Autowired 来主动注入 ProductService 接口并调用其办法。

package com.tutorialspoint.demo.controller;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.http.HttpStatus;import org.springframework.http.ResponseEntity;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;import com.tutorialspoint.demo.model.Product;import com.tutorialspoint.demo.service.ProductService;@RestControllerpublic class ProductServiceController {   @Autowired   ProductService productService;   @RequestMapping(value = "/products")   public ResponseEntity<Object> getProduct() {      return new ResponseEntity<>(productService.getProducts(), HttpStatus.OK);   }   @RequestMapping(value = "/products/{id}", method = RequestMethod.PUT)   public ResponseEntity<Object>       updateProduct(@PathVariable("id") String id, @RequestBody Product product) {            productService.updateProduct(id, product);      return new ResponseEntity<>("Product is updated successsfully", HttpStatus.OK);   }   @RequestMapping(value = "/products/{id}", method = RequestMethod.DELETE)   public ResponseEntity<Object> delete(@PathVariable("id") String id) {      productService.deleteProduct(id);      return new ResponseEntity<>("Product is deleted successsfully", HttpStatus.OK);   }   @RequestMapping(value = "/products", method = RequestMethod.POST)   public ResponseEntity<Object> createProduct(@RequestBody Product product) {      productService.createProduct(product);      return new ResponseEntity<>("Product is created successfully", HttpStatus.CREATED);   }}

  POJO class – Product.java 代码在此：

package com.tutorialspoint.demo.model;public class Product {   private String id;   private String name;   public String getId() {      return id;   }   public void setId(String id) {      this.id = id;   }   public String getName() {      return name;   }   public void setName(String name) {      this.name = name;   }}

  主 Spring Boot 利用如下：

package com.tutorialspoint.demo;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class DemoApplication {   public static void main(String[] args) {      SpringApplication.run(DemoApplication.class, args);   }}

  Maven build – pom.xml 代码如下所示：

<?xml version = "1.0" encoding = "UTF-8"?><project xmlns = "http://maven.apache.org/POM/4.0.0"    xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"   xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0    http://maven.apache.org/xsd/maven-4.0.0.xsd">      <modelVersion>4.0.0</modelVersion>   <groupId>com.tutorialspoint</groupId>   <artifactId>demo</artifactId>   <version>0.0.1-SNAPSHOT</version>   <packaging>jar</packaging>   <name>demo</name>   <description>Demo project for Spring Boot</description>   <parent>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-parent</artifactId>      <version>1.5.8.RELEASE</version>      <relativePath/>    </parent>   <properties>      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>      <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>      <java.version>1.8</java.version>   </properties>   <dependencies>      <dependency>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-web</artifactId>      </dependency>      <dependency>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-test</artifactId>         <scope>test</scope>      </dependency>   </dependencies>   <build>      <plugins>         <plugin>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-maven-plugin</artifactId>         </plugin>      </plugins>   </build></project>

  Gradle Build – build.gradle 代码如下：

buildscript {   ext {      springBootVersion = '1.5.8.RELEASE'   }   repositories {      mavenCentral()   }   dependencies {      classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")   }}apply plugin: 'java'apply plugin: 'eclipse'apply plugin: 'org.springframework.boot'group = 'com.tutorialspoint'version = '0.0.1-SNAPSHOT'sourceCompatibility = 1.8repositories {   mavenCentral()}dependencies {   compile('org.springframework.boot:spring-boot-starter-web')   testCompile('org.springframework.boot:spring-boot-starter-test')}

  当初你能够应用 Maven 或 Gradle 命令创立可执行 executable JAR 文件并运行 Spring Boot 利用了：
  Maven 命令如下：

mvn clean install

  在 “BUILD SUCCESS” 之后，你能够在 target 目录下找到 JAR 文件。
  Gradle 能够应用以下命令：

gradle clean build

  在 “BUILD SUCCESSFUL” 之后，你能够在 build/libs 目录下找到 JAR 文件。
  当初，应用以下命令运行 JAR 文件：

java –jar <JARFILE>

  利用将在 Tomcat 8080 端口启动，如下图所示：

  当初在 POSTMAN 利用中输出以下 URL，能够看到下图所示的输入：
GET API URL 为： http://localhost:8080/products

POST API URL 为： http://localhost:8080/products

PUT API URL 为： http://localhost:8080/products/3

DELETE API URL 为： http://localhost:8080/products/3