编写微服务api

1.创建实体类模块

2.导入lombok

<dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <scope>provided</scope>
        </dependency>
    </dependencies>

3.添加实体类

package com.cx;

import lombok.Data;

import java.math.BigDecimal;
import java.util.List;

/**
 * @author Jiang
 * @date 2025/11/7
 */
@Data
public class Order {
    private Long id;
    private BigDecimal totalAmount;
    private Long userId;
    private String nickName;
    private String address;
    private List<Product> productList;
}

package com.cx;

import lombok.Data;

import java.math.BigDecimal;

/**
 * @author Jiang
 * @date 2025/11/7
 */
@Data
public class Product {
    private Long id;
    private BigDecimal price;
    private String productName;
    private int num;
}

4.在services的pom文件中导入model

 <dependency>
    <groupId>com.cx</groupId>
    <artifactId>model</artifactId>
    <version>0.0.1-SNAPSHOT</version>
</dependency>

5.基本流程

6.product模块代码

package com.cx.product.controller;

import com.cx.Product;
import com.cx.product.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author Jiang
 * @date 2025/11/7
 */
@RestController
public class ProductController {
    @Autowired
    ProductService productService;

    @GetMapping(value = "/productId/{id}")
    public Product getProductById(@PathVariable("id") Long productId) {
        return productService.getProductById(productId);
    }
}

package com.cx.product.service;

import com.cx.Product;

/**
 * @author Jiang
 * @date 2025/11/7
 */
public interface ProductService {
    Product getProductById(Long productId);
}

package com.cx.product.service.impl;

import com.cx.Product;
import com.cx.product.service.ProductService;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;

/**
 * @author Jiang
 * @date 2025/11/7
 */
@Service
public class ProductServiceImpl implements ProductService {
    @Override
    public Product getProductById(Long productId) {
        Product product = new Product();
        product.setId(productId);
        product.setPrice(new BigDecimal("99"));
        product.setProductName("苹果-" + productId);
        product.setNum(11);
        return product;
    }
}

7.order模块代码

package com.cx.order.controller;

import com.cx.Order;
import com.cx.order.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author Jiang
 * @date 2025/11/7
 */
@RestController
public class OrderController {
    @Autowired
    OrderService orderService;

    @GetMapping(value = "/create")
    public Order createOrder(@RequestParam("userId") Long userId, @RequestParam("productId") Long productId) {
        return orderService.createOrder(userId, productId);
    }
}

package com.cx.order.service;

import com.cx.Order;

/**
 * @author Jiang
 * @date 2025/11/7
 */
public interface OrderService {
    Order createOrder(Long userId, Long productId);
}

package com.cx.order.service.impl;

import com.cx.Order;
import com.cx.order.service.OrderService;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;

/**
 * @author Jiang
 * @date 2025/11/7
 */
@Service
public class OrderServiceImpl implements OrderService {
    @Override
    public Order createOrder(Long userId, Long productId) {
        Order order = new Order();
        order.setId(1L);
        //TODO 总金额
        order.setTotalAmount(new BigDecimal("0"));
        order.setUserId(userId);
        order.setNickName("张三");
        order.setAddress("火星");
        //TODO 远程查询商品列表
        order.setProductList(null);
        return order;
    }
}