Service Components
Service Components是包含@Service注释的类文件。 这些类文件用于在不同的层中编写业务逻辑,与@RestController类文件分开。 此处显示了创建服务组件类文件的逻辑 -
public interface ProductService {
}
使用@Service注释实现接口的类如下所示 -
@Service
public class ProductServiceImpl implements ProductService {
}
请注意,在本教程中,我们使用Product Service API(s)来存储,检索,更新和删除产品。 我们在@RestController类文件中编写了业务逻辑。 现在,我们将业务逻辑代码从控制器移动到服务组件。
您可以使用如下所示的代码创建包含添加,编辑,获取和删除方法的接口 -
package cn.xnip.demo.service;
import java.util.Collection;
import cn.xnip.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使用@Service批注实现ProductService接口的类,并编写业务逻辑以存储,检索,删除和更新产品。
package cn.xnip.demo.service;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import org.springframework.stereotype.Service;
import cn.xnip.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,这里我们@Autowired了ProductService接口并调用了方法。
package cn.xnip.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 cn.xnip.demo.model.Product;
import cn.xnip.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类的代码 - Product.java在这里显示 -
package cn.xnip.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 cn.xnip.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 build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>cn.xnip</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 = 'cn.xnip'
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,应用程序已在Tomcat端口8080上启动,如下图所示 -
现在点击POSTMAN应用程序中的以下URL,您可以看到如下所示的输出 -
GET API URL是 - http://localhost:8080/products
POST API URL是 - http://localhost:8080/products
PUT API URL是 - http://localhost:8080/products/3
DELETE API URL是 - http://localhost:8080/products/3