📜  Spring Boot-服务组件

📅  最后修改于: 2020-11-11 05:38:26             🧑  作者: Mango


服务组件是包含@Service批注的类文件。这些类文件用于在与@RestController类文件分开的不同层中编写业务逻辑。创建服务组件类文件的逻辑如下所示:

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,我们正在使用产品服务API来存储,检索,更新和删除产品。我们在@RestController类文件本身中编写了业务逻辑。现在,我们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.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 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.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;

@Service
public class ProductServiceImpl implements ProductService {
   private static Map 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 getProducts() {
      return productRepo.values();
   }
}

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

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;

@RestController
public class ProductServiceController {
   @Autowired
   ProductService productService;

   @RequestMapping(value = "/products")
   public ResponseEntity getProduct() {
      return new ResponseEntity<>(productService.getProducts(), HttpStatus.OK);
   }
   @RequestMapping(value = "/products/{id}", method = RequestMethod.PUT)
   public ResponseEntity 
      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 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 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.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;
   }
}

下面给出了一个主要的Spring Boot应用程序-

package com.tutorialspoint.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-



   
   4.0.0
   com.tutorialspoint
   demo
   0.0.1-SNAPSHOT
   jar
   demo
   Demo project for Spring Boot

   
      org.springframework.boot
      spring-boot-starter-parent
      1.5.8.RELEASE
       
   

   
      UTF-8
      UTF-8
      1.8
   

   
      
         org.springframework.boot
         spring-boot-starter-web
      

      
         org.springframework.boot
         spring-boot-starter-test
         test
      
   

   
      
         
            org.springframework.boot
            spring-boot-maven-plugin
         
      
   


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.tutorialspoint'
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')
}

您可以创建一个可执行的JAR文件,并使用下面给出的Maven或Gradle命令运行Spring Boot应用程序-

对于Maven,使用如下所示的命令-

mvn clean install

在“ BUILD SUCCESS”之后,您可以在目标目录下找到JAR文件。

对于Gradle,您可以使用如下所示的命令-

gradle clean build

在“ BUILD SUCCESSFUL”之后,您可以在build / libs目录下找到JAR文件。

使用下面给出的命令运行JAR文件-

java –jar  

现在,应用程序已在Tomcat端口8080上启动,如下图所示:

建立成功

现在在POSTMAN应用程序中点击以下URL,您可以看到如下所示的输出-

GET API URL是-http:// localhost:8080 / products

邮递员应用程序GET API URL

POST API URL是-http:// localhost:8080 / products

邮递员应用程序POST API URL

PUT API URL是-http:// localhost:8080 / products / 3

邮递员应用程序PUT API URL

DELETE API URL是-http:// localhost:8080 / products / 3

邮递员应用程序DELETE API URL