接下来，我们按照传统的做法搭建商品和订单服务，首先创建web项目常见的三个包，分别为model、service、controller：

然后在model里面创建三个类，分别为Goods、Order、OrderDetails

其中Goods代码如下

package com.felix.model;

/**
 * Created by weistekweistek on 2019/1/3.
 */
public class Goods {
    private Long goodsid;
    private String title;
    private String pic;
    private String desc;
    private Float price;

    public Goods() {
    }

    public Goods(Long goodsid, String title, String pic, String desc, Float price) {
        this.goodsid = goodsid;
        this.title = title;
        this.pic = pic;
        this.desc = desc;
        this.price = price;
    }

    @Override
    public String toString() {
        return "Goods{" +
                "goodsid=" + goodsid +
                ", title='" + title + '\'' +
                ", pic='" + pic + '\'' +
                ", desc='" + desc + '\'' +
                ", price=" + price +
                '}';
    }

    public Long getGoodsid() {
        return goodsid;
    }

    public void setGoodsid(Long goodsid) {
        this.goodsid = goodsid;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getPic() {
        return pic;
    }

    public void setPic(String pic) {
        this.pic = pic;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    public Float getPrice() {
        return price;
    }

    public void setPrice(Float price) {
        this.price = price;
    }
}

订单详情代码（包含商品信息）：

package com.felix.model;

/**
 * Created by weistekweistek on 2019/1/3.
 */
public class OrderDetails {
    private Long orderDetailsID;
    private Long orderID;
    private Goods goods;
    private Integer goodsCount;

    public Long getOrderDetailsID() {
        return orderDetailsID;
    }

    public void setOrderDetailsID(Long orderDetailsID) {
        this.orderDetailsID = orderDetailsID;
    }

    public Long getOrderID() {
        return orderID;
    }

    public void setOrderID(Long orderID) {
        this.orderID = orderID;
    }

    public Goods getGoods() {
        return goods;
    }

    public void setGoods(Goods goods) {
        this.goods = goods;
    }

    public Integer getGoodsCount() {
        return goodsCount;
    }

    public void setGoodsCount(Integer goodsCount) {
        this.goodsCount = goodsCount;
    }

    public OrderDetails(Long orderDetailsID, Long orderID, Goods goods, Integer goodsCount) {

        this.orderDetailsID = orderDetailsID;
        this.orderID = orderID;
        this.goods = goods;
        this.goodsCount = goodsCount;
    }

    @Override
    public String toString() {
        return "OrderDetails{" +
                "orderDetailsID=" + orderDetailsID +
                ", orderID=" + orderID +
                ", goods=" + goods +
                ", goodsCount=" + goodsCount +
                '}';
    }

    public OrderDetails() {

    }
}

订单代码：

package com.felix.model;

import java.util.Date;
import java.util.List;

/**
 * Created by weistekweistek on 2019/1/3.
 */
public class Order {
    private Long orderid;
    private Long userid;
    private Date createDate;
    private Date updateDate;
    private List orderDetailsList;


    public Order(Long orderid, Long userid, Date createDate, Date updateDate, List orderDetailsList) {
        this.orderid = orderid;
        this.userid = userid;
        this.createDate = createDate;
        this.updateDate = updateDate;
        this.orderDetailsList = orderDetailsList;
    }

    @Override

    public String toString() {
        return "Order{" +
                "orderid=" + orderid +
                ", userid=" + userid +
                ", createDate=" + createDate +
                ", updateDate=" + updateDate +
                ", orderDetailsList=" + orderDetailsList +
                '}';
    }

    public Long getOrderid() {
        return orderid;
    }

    public void setOrderid(Long orderid) {
        this.orderid = orderid;
    }

    public Long getUserid() {
        return userid;
    }

    public void setUserid(Long userid) {
        this.userid = userid;
    }

    public Date getCreateDate() {
        return createDate;
    }

    public void setCreateDate(Date createDate) {
        this.createDate = createDate;
    }

    public Date getUpdateDate() {
        return updateDate;
    }

    public void setUpdateDate(Date updateDate) {
        this.updateDate = updateDate;
    }

    public List getOrderDetailsList() {
        return orderDetailsList;
    }

    public void setOrderDetailsList(List orderDetailsList) {
        this.orderDetailsList = orderDetailsList;
    }

    public Order() {

    }
}

上面内容比较简单，不做详细解释，然后，我们针对上面的Goods、Order创建对应的服务GoodsService、OrderService
其中GoodsService中创建一个使用商品id查询商品的函数（商品数据为伪造数据）

package com.felix.service;

import com.felix.model.Goods;
import org.springframework.stereotype.Service;

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

/**
 * Created by weistekweistek on 2019/1/3.
 */
@Service
public class GoodsService {
    public static final Map goods_map = new HashMap();
    static {
        goods_map.put(1L,new Goods(1L,"商品01","http://127.0.0.1/01.png","商品01描述",10.0F));
        goods_map.put(2L,new Goods(2L,"商品02","http://127.0.0.1/02.png","商品02描述",10.0F));
        goods_map.put(3L,new Goods(3L,"商品03","http://127.0.0.1/03.png","商品03描述",10.0F));
        goods_map.put(4L,new Goods(4L,"商品04","http://127.0.0.1/04.png","商品04描述",10.0F));
        goods_map.put(5L,new Goods(5L,"商品05","http://127.0.0.1/05.png","商品05描述",10.0F));
        goods_map.put(6L,new Goods(6L,"商品06","http://127.0.0.1/06.png","商品06描述",10.0F));
        goods_map.put(7L,new Goods(7L,"商品07","http://127.0.0.1/07.png","商品07描述",10.0F));
        goods_map.put(8L,new Goods(8L,"商品08","http://127.0.0.1/08.png","商品08描述",10.0F));
        goods_map.put(9L,new Goods(9L,"商品09","http://127.0.0.1/09.png","商品09描述",10.0F));
        goods_map.put(10L,new Goods(10L,"商品10","http://127.0.0.1/10.png","商品10描述",10.0F));
    }
    public Goods findGoodsById(Long id){
        return goods_map.get(id);
    }
}

OrderService中创建一个使用订单id查询订单的函数（订单数据为伪造数据）

package com.felix.service;

import com.felix.model.Order;
import com.felix.model.OrderDetails;
import org.springframework.stereotype.Service;

import java.util.*;

/**
 * Created by weistekweistek on 2019/1/3.
 */
@Service
public class OrderService {
    private static final Map order_map = new HashMap();
    static {
        List orderDetailsList = new ArrayList();
        for (Long i = 1L;i <= 10L;i++){
            orderDetailsList.add(new OrderDetails(i ,i,GoodsService.goods_map.get(i),5));
            order_map.put(i,new Order(i,i,new Date(),new Date(),new ArrayList(orderDetailsList)));
            System.out.println(order_map);
        }
    }

    public Order findOrderById(Long id){
        return order_map.get(id);
    }
}

然后，在controller里分别创建GoodsController、ServiceController，同时创建接口返回对应的商品/订单信息
GoodsController中代码如下

package com.felix.controller;

import com.felix.model.Goods;
import com.felix.service.GoodsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Created by weistekweistek on 2019/1/3.
 */
@RestController
@RequestMapping(value = "/goods")
public class GoodsController {
    @Autowired
    private GoodsService goodsService;

    @RequestMapping(value = "/{id}")
    public Goods findGoodsById(@PathVariable("id") Long id){
        return goodsService.findGoodsById(id);
    }
}

OrderController中代码如下

package com.felix.controller;

import com.felix.model.Order;
import com.felix.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Created by weistekweistek on 2019/1/3.
 */
@RestController
@RequestMapping(value = "/order")
public class OrderController {
    @Autowired
    private OrderService orderService;

    @RequestMapping(value = "/{id}")
    public Order findOrderById(@PathVariable("id") Long id){
        return orderService.findOrderById(id);
    }
}

传统的服务器均采用上述形式提供服务，上面的代码提供了两个接口http://127.0.0.1:8080/goods/{id}、http://127.0.0.1:8080/order/{id}，其中id可以自行修改，SpringBoot默认采用了8080端口，我们暂时不做改变，现在启动服务器，等到服务器启动后访问http://127.0.0.1:8080/goods/1查看效果

可以正常提供商品服务，并返回商品信息的JSON数据（Chrome浏览器安装了Json Formatter插件）
然后访问订单接口查看订单信息http://127.0.0.1:8080/order/3

我们请求了订单id为3的订单数据，从返回的JSON数据可以看到，订单信息里的订单详情列表正常返回。

以上为传统服务搭建。那么如果现在随着我们业务量的增大，单台服务器已经不能满足我们的业务需求，需要把商品和订单独立到两个不同的服务器，该怎么样进行操作呢？下节，我们将针对现有的服务进行改造，在返回数据不改变的前提下实现商品和订单服务的分离。

分布式系统开发---商品服务分离SpringCloud（三）
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分布式系统开发---传统服务搭建SpringCloud（二）

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