Spring Boot - Service Components

SpringBoot中通过@Service声明服务组件类，这些类与@RestController类隔离并在不同的层用来处理业务逻辑，创建一个服务类组件如下：

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public initerface ProductService(){

}

@Service
public class ProductServiceImpl implements ProductService{

}

在本教程中，使用到Product Service API（s）来存储，检索，更新以及删除数据，之前我们的业务逻辑是放在@RestController类中，现在我们将业务逻辑代码从控制器代码中转移到服务组件。
首先你需要创建一个接口约束add,edit,get以及delete方法，如下：

package com.restfulapio.demo.service;
import com.restfulapio.demo.bean.Product;
import java.util.Collection;
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();
}

然后你应该创建一个实现这个接口的类并标注@Service注解，然后实现store,retrieve,delete和update的具体业务逻辑,如下；

package com.restfulapio.demo.service;

import com.restfulapio.demo.bean.Product;
import org.springframework.stereotype.Service;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
@Service
public class ProductServiceImpl implements ProductService {
    private static Map<String, Product> productMap = new HashMap<>();
    static{
        Product honey = new Product();
        honey.setId("1");
        honey.setName("Honey");
        productMap.put(honey.getId(), honey);

        Product almond = new Product();
        almond.setId("2");
        almond.setName("Almond");
        productMap.put(almond.getId(), almond);
    }
    @Override
    public void createProduct(Product product) {
        productMap.put(product.getId(), product);
    }
    @Override
    public void updateProduct(String id, Product product) {
        productMap.remove(id);
        product.setId(id);
        productMap.put(id, product);
    }
    @Override
    public void deleteProduct(String id) {
        productMap.remove(id);
    }
    @Override
    public Collection<Product> getProducts() {
        return productMap.values();
    }
}

最后，我们只需要在@RestController控制器类中自动注入Service服务类组件就可以了，如下：

package com.restfulapio.demo.controller;

import com.restfulapio.demo.bean.Product;
import com.restfulapio.demo.exception.ProductException;
import com.restfulapio.demo.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import java.util.HashMap;
import java.util.Map;


@RestController
public class ProductServiceController {
    @Autowired
    ProductService productService;

    @RequestMapping(value = "/products")
    public ResponseEntity<Object> getProduct(){
        return new ResponseEntity<Object>(productService.getProducts(), 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);
    }
    @RequestMapping(value = "/products/{id}",method = RequestMethod.PUT)
    public ResponseEntity<Object> updateProduct(@PathVariable("id") String id,@RequestBody Product product){
        productService.deleteProduct(id);
        product.setId(id);
        productService.updateProduct(id, product);
        return new ResponseEntity<>("Product is updated successfully",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 successfully",HttpStatus.OK);
    }
}

测试

GET API
localhost
POST API

UPDATE API

DELETE API