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); 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(); } }
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.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> <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') }
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 <JARFILE>
现在,该应用程序已在Tomcat端口8080上启动,如下图所示:
现在在POSTMAN应用程序中单击下面的URL,您可以看到如下所示的输出-
GET API URL是- http:// localhost:8080/products
POST API URL为- http:// localhost:8080/products
PUT API URL为- http:// localhost:8080/products/3
DELETE API URL是- http:// localhost:8080/products/3
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