无涯教程-Spring Boot - Service组件服务组件是包含@Service批注的类文件，这些类文件用于与@

服务组件是包含@Service批注的类文件，这些类文件用于与@RestController类文件分开不同业务逻辑。这里显示了创建服务组件类文件的逻辑-

public interface ProductService {
}

用@Service注释实现Interface的类如下所示:

@Service
public class ProductServiceImpl implements ProductService {
}

请注意，在本教程中，使用产品服务API 来存储，检索，更新和删除产品。在@RestController类文件本身中编写了业务逻辑。现在，无涯教程将把业务逻辑代码从控制器转移到服务组件。

您可以使用如下所示的代码创建一个包含添加，编辑，获取和删除方法的接口-

package com.learnfk.demo.service;
import java.util.Collection;
import com.learnfk.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();
}

以下代码将允许您创建一个类，该类使用@Service批注实现ProductService接口，并编写用于存储，检索，删除和更新产品的业务逻辑。

package com.learnfk.demo.service;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import org.springframework.stereotype.Service;
import com.learnfk.demo.model.Product;
@Service
public 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);
  </span><span class="typ">Product</span><span class="pln"> almond</span><span class="pun">=</span><span class="kwd">new</span><span class="pln"> </span><span class="typ">Product</span><span class="pun">();</span><span class="pln">
  almond</span><span class="pun">.</span><span class="pln">setId</span><span class="pun">(</span><span class="str">"2"</span><span class="pun">);</span><span class="pln">
  almond</span><span class="pun">.</span><span class="pln">setName</span><span class="pun">(</span><span class="str">"Almond"</span><span class="pun">);</span><span class="pln">
  productRepo</span><span class="pun">.</span><span class="pln">put</span><span class="pun">(</span><span class="pln">almond</span><span class="pun">.</span><span class="pln">getId</span><span class="pun">(),</span><span class="pln"> almond</span><span class="pun">);</span><span class="pln">

}
@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();
}
}

这里的代码显示了Rest Controller类文件，在这里无涯教程@Autowired ProductService接口并调用了方法。

package com.learnfk.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.learnfk.demo.model.Product;
import com.learnfk.demo.service.ProductService;
@RestController
public 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</span><span class="pun">.</span><span class="pln">updateProduct</span><span class="pun">(</span><span class="pln">id</span><span class="pun">,</span><span class="pln"> product</span><span class="pun">);</span><span class="pln">
  </span><span class="kwd">return</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">ResponseEntity</span><span class="pun">&lt;&gt;(</span><span class="str">"Product is updated successsfully"</span><span class="pun">,</span><span class="pln"> </span><span class="typ">HttpStatus</span><span class="pun">.</span><span class="pln">OK</span><span class="pun">);</span><span class="pln">

}
@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类– Product.java的代码如下所示-

package com.learnfk.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;
}
}

下面给出了一个主要的Spring Boot应用程序-

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

Maven构建的代码– pom.xml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.learnfk</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>
  </span><span class="tag">&lt;dependency&gt;</span><span class="pln">
     </span><span class="tag">&lt;groupId&gt;</span><span class="pln">org.springframework.boot</span><span class="tag">&lt;/groupId&gt;</span><span class="pln">
     </span><span class="tag">&lt;artifactId&gt;</span><span class="pln">spring-boot-starter-test</span><span class="tag">&lt;/artifactId&gt;</span><span class="pln">
     </span><span class="tag">&lt;scope&gt;</span><span class="pln">test</span><span class="tag">&lt;/scope&gt;</span><span class="pln">
  </span><span class="tag">&lt;/dependency&gt;</span><span class="pln">

</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

Gradle Build – build.gradle的代码如下所示-

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.learnfk
version=0.0.1-SNAPSHOT
sourceCompatibility=1.8
repositories {
mavenCentral()
}
dependencies {
compile(org.springframework.boot:spring-boot-starter-web)
testCompile(org.springframework.boot:spring-boot-starter-test)
}