SpringClub01-基础建设

一、SpringClub

1. spring cloud 介绍

spring cloud 是一系列框架的集合。它利用 spring boot 的开发便利性巧妙地简化了分布式系统基础设施的开发,如服务发现注册、配置中心、消息总线、负载均衡、断路器、数据监控等,都可以用 spring boot 的开发风格做到一键启动和部署。spring cloud 并没有重复制造轮子,它只是将目前各家公司开发的比较成熟、经得起实际考验的服务框架组合起来,通过 spring boot 风格进行再封装屏蔽掉了复杂的配置和实现原理,最终给开发者留出了一套简单易懂、易部署和易维护的分布式系统开发工具包。
spring cloud 对于中小型互联网公司来说是一种福音,因为这类公司往往没有实力或者没有足够的资金投入去开发自己的分布式系统基础设施,使用 spring cloud 一站式解决方案能在从容应对业务发展的同时大大减少开发成本。同时,随着近几年微服务架构和 docker 容器概念的火爆,也会让 spring cloud 在未来越来越“云”化的软件开发风格中立有一席之地,尤其是在目前五花八门的分布式解决方案中提供了标准化的、一站式的技术方案,意义可能会堪比当年 servlet 规范的诞生,有效推进服务端软件系统技术水平的进步。

2. spring cloud 技术组成

Spring Cloud

  • eureka
    微服务治理,服务注册和发现
  • ribbon
    负载均衡、请求重试
  • hystrix
    断路器,服务降级、熔断
  • feign
    ribbon + hystrix 集成,并提供声明式客户端
  • hystrix dashboard 和 turbine
    hystrix 数据监控
  • zuul
    API 网关,提供微服务的统一入口,并提供统一的权限验证
  • config
    配置中心
  • bus
    消息总线, 配置刷新
  • sleuth+zipkin
    链路跟踪

3. Spring Cloud 对比 Dubbo

Spring Cloud对比Dubbo

  • Dubbo

    • Dubbo只是一个远程调用(RPC)框架
    • 默认基于长连接,支持多种序列化格式
  • Spring Cloud

    • 框架集
    • 提供了一整套微服务解决方案(全家桶)
    • 基于http调用, Rest API

二、业务服务

在这里插入图片描述

  • 商品服务 item service,端口 8001
  • 用户服务 user service,端口 8101
  • 订单服务 order service,端口 8201

1. 创建commons 通用项目

1.1 新建 maven 项目

image.png

1.2 编辑pom.xml文件


    4.0.0
    cn.tedu
    sp01-commons
    0.0.1-SNAPSHOT
    sp01-commons
    
        
            com.fasterxml.jackson.module
            jackson-module-parameter-names
            2.9.8
        
        
com.fasterxml.jackson.datatype
            jackson-datatype-jdk8
            2.9.8
        
        
        com.fasterxml.jackson.datatype
            jackson-datatype-jsr310
            2.9.8
        
        
        com.fasterxml.jackson.datatype
            jackson-datatype-guava
            2.9.8
        

        
            org.projectlombok
            lombok
            1.18.6
        
        
            javax.servlet
            javax.servlet-api
            3.1.0
        
        
            org.slf4j
            slf4j-api
            1.7.26
        
        
            org.apache.commons
            commons-lang3
            3.9
        
    
    
        
            
                org.apache.maven.plugins
                maven-compiler-plugin
                3.8.0
                
                    1.8
                    1.8
                
            
        
    

1.3 创建pojo类

image.png

1.3.1 Item
package cn.tedu.sp01.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Item {
    private Integer id;
    private String name;
    private Integer number;
}
1.3.2 User
package cn.tedu.sp01.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    private Integer id;
    private String username;
    private String password;
}
1.3.3 Order
package cn.tedu.sp01.pojo;
import java.util.List;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Order {
    private String id;
    private User user;
    private List items;
}

1.4 创建service类

image.png

1.4.1 ItemService
package cn.tedu.sp01.service;
import cn.tedu.sp01.pojo.Item;
import java.util.List;
public interface ItemService {
    //获取订单的商品列表
 List getItems(String orderId);
    //减少商品库存
 void decreaseNumber(List items);
}
1.4.2 UserService
package cn.tedu.sp01.service;
import cn.tedu.sp01.pojo.User;
public interface UserService {
    //获取用户
 User getUser(Integer userId);
    //添加用户积分
 void addScore(Integer userId,Integer score);
}
1.4.3 OrderService
package cn.tedu.sp01.service;
import cn.tedu.sp01.pojo.Order;
public interface OrderService {
    //获取订单
 Order getOrder(String orderId);
    //添加订单
 void addOrder(Order order);
}

1.5 创建util类

1.5.1 CookieUtil
package cn.tedu.web.util;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class CookieUtil {
    /**
     * @param response
     * @param name
     * @param value
     * @param maxAge
     */
    public static void setCookie(HttpServletResponse response,
            String name, String value, String domain, String path, int maxAge) {
        Cookie cookie = new Cookie(name, value);
        if(domain != null) {
            cookie.setDomain(domain);
        }
        cookie.setPath(path);
        cookie.setMaxAge(maxAge);
        response.addCookie(cookie);
    }
    public static void setCookie(HttpServletResponse response, String name, String value, int maxAge) {
        setCookie(response, name, value, null, "/", maxAge);
    }
    public static void setCookie(HttpServletResponse response, String name, String value) {
        setCookie(response, name, value, null, "/", 3600);
    }
    public static void setCookie(HttpServletResponse response, String name) {
        setCookie(response, name, "", null, "/", 3600);
    }
    /**
     * @param request
     * @param name
     * @return
     */
    public static String getCookie(HttpServletRequest request, String name) {
        String value = null;
        Cookie[] cookies = request.getCookies();
        if (null != cookies) {
            for (Cookie cookie : cookies) {
                if (cookie.getName().equals(name)) {
                    value = cookie.getValue();
                }
            }
        }
        return value;
    }
    /**
     * @param response
     * @param name
     * @return
     */
    public static void removeCookie(HttpServletResponse response, String name, String domain, String path) {
        setCookie(response, name, "", domain, path, 0);
    }
}
1.5.2 #### JsonUtil
package cn.tedu.web.util;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Writer;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.lang3.StringUtils;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.datatype.guava.GuavaModule;
import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.module.paramnames.ParameterNamesModule;
import lombok.extern.slf4j.Slf4j;
@Slf4j
public class JsonUtil {
    private static ObjectMapper mapper;
    private static JsonInclude.Include DEFAULT_PROPERTY_INCLUSION = JsonInclude.Include.NON_DEFAULT;
    private static boolean IS_ENABLE_INDENT_OUTPUT = false;
    private static String CSV_DEFAULT_COLUMN_SEPARATOR = ",";
    static {
        try {
            initMapper();
            configPropertyInclusion();
            configIndentOutput();
            configCommon();
        } catch (Exception e) {
            log.error("jackson config error", e);
        }
    }
    private static void initMapper() {
        mapper = new ObjectMapper();
    }

    private static void configCommon() {
        config(mapper);
    }
    private static void configPropertyInclusion() {
        mapper.setSerializationInclusion(DEFAULT_PROPERTY_INCLUSION);
    }
    private static void configIndentOutput() {
        mapper.configure(SerializationFeature.INDENT_OUTPUT, IS_ENABLE_INDENT_OUTPUT);
    }
    private static void config(ObjectMapper objectMapper) {
        objectMapper.enable(JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN);
        objectMapper.enable(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);
        objectMapper.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY);
        objectMapper.enable(DeserializationFeature.FAIL_ON_READING_DUP_TREE_KEY);
        objectMapper.enable(DeserializationFeature.FAIL_ON_NUMBERS_FOR_ENUMS);
        objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
        objectMapper.disable(DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES);
        objectMapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
        objectMapper.enable(JsonParser.Feature.ALLOW_COMMENTS);
        objectMapper.disable(JsonGenerator.Feature.ESCAPE_NON_ASCII);
        objectMapper.enable(JsonGenerator.Feature.IGNORE_UNKNOWN);
        objectMapper.enable(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES);
        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
        objectMapper.enable(JsonParser.Feature.ALLOW_SINGLE_QUOTES);
        objectMapper.registerModule(new ParameterNamesModule());
        objectMapper.registerModule(new Jdk8Module());
        objectMapper.registerModule(new JavaTimeModule());
        objectMapper.registerModule(new GuavaModule());
    }
    public static void setSerializationInclusion(JsonInclude.Include inclusion) {
        DEFAULT_PROPERTY_INCLUSION = inclusion;
        configPropertyInclusion();
    }
    public static void setIndentOutput(boolean isEnable) {
        IS_ENABLE_INDENT_OUTPUT = isEnable;
        configIndentOutput();
    }
    public static  V from(URL url, Class c) {
        try {
            return mapper.readValue(url, c);
        } catch (IOException e) {
            log.error("jackson from error, url: {}, type: {}", url.getPath(), c, e);
            return null;
        }
    }
    public static  V from(InputStream inputStream, Class c) {
        try {
            return mapper.readValue(inputStream, c);
        } catch (IOException e) {
            log.error("jackson from error, type: {}", c, e);
            return null;
        }
    }
    public static  V from(File file, Class c) {
        try {
            return mapper.readValue(file, c);
        } catch (IOException e) {
            log.error("jackson from error, file path: {}, type: {}", file.getPath(), c, e);
            return null;
        }
    }
    public static  V from(Object jsonObj, Class c) {
        try {
            return mapper.readValue(jsonObj.toString(), c);
        } catch (IOException e) {
            log.error("jackson from error, json: {}, type: {}", jsonObj.toString(), c, e);
            return null;
        }
    }
    public static  V from(String json, Class c) {
        try {
            return mapper.readValue(json, c);
        } catch (IOException e) {
            log.error("jackson from error, json: {}, type: {}", json, c, e);
            return null;
        }
    }
    public static  V from(URL url, TypeReference type) {
        try {
            return mapper.readValue(url, type);
        } catch (IOException e) {
            log.error("jackson from error, url: {}, type: {}", url.getPath(), type, e);
            return null;
        }
    }
    public static  V from(InputStream inputStream, TypeReference type) {
        try {
            return mapper.readValue(inputStream, type);
        } catch (IOException e) {
            log.error("jackson from error, type: {}", type, e);
            return null;
        }
    }
    public static  V from(File file, TypeReference type) {
        try {
            return mapper.readValue(file, type);
        } catch (IOException e) {
            log.error("jackson from error, file path: {}, type: {}", file.getPath(), type, e);
            return null;
        }
    }
    public static  V from(Object jsonObj, TypeReference type) {
        try {
            return mapper.readValue(jsonObj.toString(), type);
        } catch (IOException e) {
            log.error("jackson from error, json: {}, type: {}", jsonObj.toString(), type, e);
            return null;
        }
    }
    public static  V from(String json, TypeReference type) {
        try {
            return mapper.readValue(json, type);
        } catch (IOException e) {
            log.error("jackson from error, json: {}, type: {}", json, type, e);
            return null;
        }
    }
    public static  String to(List list) {
        try {
            return mapper.writeValueAsString(list);
        } catch (JsonProcessingException e) {
            log.error("jackson to error, obj: {}", list, e);
            return null;
        }
    }
    public static  String to(V v) {
        try {
            return mapper.writeValueAsString(v);
        } catch (JsonProcessingException e) {
            log.error("jackson to error, obj: {}", v, e);
            return null;
        }
    }
    public static  void toFile(String path, List list) {
        try (Writer writer = new FileWriter(new File(path), true)) {
            mapper.writer().writeValues(writer).writeAll(list);
            writer.flush();
        } catch (Exception e) {
            log.error("jackson to file error, path: {}, list: {}", path, list, e);
        }
    }
    public static  void toFile(String path, V v) {
        try (Writer writer = new FileWriter(new File(path), true)) {
            mapper.writer().writeValues(writer).write(v);
            writer.flush();
        } catch (Exception e) {
            log.error("jackson to file error, path: {}, obj: {}", path, v, e);
        }
    }
    public static String getString(String json, String key) {
        if (StringUtils.isEmpty(json)) {
            return null;
        }
        try {
            JsonNode node = mapper.readTree(json);
            if (null != node) {
                return node.get(key).toString();
            } else {
                return null;
            }
        } catch (IOException e) {
            log.error("jackson get string error, json: {}, key: {}", json, key, e);
            return null;
        }
    }
    public static Integer getInt(String json, String key) {
        if (StringUtils.isEmpty(json)) {
            return null;
        }
        try {
            JsonNode node = mapper.readTree(json);
            if (null != node) {
                return node.get(key).intValue();
            } else {
                return null;
            }
        } catch (IOException e) {
            log.error("jackson get int error, json: {}, key: {}", json, key, e);
            return null;
        }
    }
    public static Long getLong(String json, String key) {
        if (StringUtils.isEmpty(json)) {
            return null;
        }
        try {
            JsonNode node = mapper.readTree(json);
            if (null != node) {
                return node.get(key).longValue();
            } else {
                return null;
            }
        } catch (IOException e) {
            log.error("jackson get long error, json: {}, key: {}", json, key, e);
            return null;
        }
    }
    public static Double getDouble(String json, String key) {
        if (StringUtils.isEmpty(json)) {
            return null;
        }
        try {
            JsonNode node = mapper.readTree(json);
            if (null != node) {
                return node.get(key).doubleValue();
            } else {
                return null;
            }
        } catch (IOException e) {
            log.error("jackson get double error, json: {}, key: {}", json, key, e);
            return null;
        }
    }
    public static BigInteger getBigInteger(String json, String key) {
        if (StringUtils.isEmpty(json)) {
            return new BigInteger(String.valueOf(0.00));
        }
        try {
            JsonNode node = mapper.readTree(json);
            if (null != node) {
                return node.get(key).bigIntegerValue();
            } else {
                return null;
            }
        } catch (IOException e) {
            log.error("jackson get biginteger error, json: {}, key: {}", json, key, e);
            return null;
        }
    }
    public static BigDecimal getBigDecimal(String json, String key) {
        if (StringUtils.isEmpty(json)) {
            return null;
        }
        try {
            JsonNode node = mapper.readTree(json);
            if (null != node) {
                return node.get(key).decimalValue();
            } else {
                return null;
            }
        } catch (IOException e) {
            log.error("jackson get bigdecimal error, json: {}, key: {}", json, key, e);
            return null;
        }
    }
    public static boolean getBoolean(String json, String key) {
        if (StringUtils.isEmpty(json)) {
            return false;
        }
        try {
            JsonNode node = mapper.readTree(json);
            if (null != node) {
                return node.get(key).booleanValue();
            } else {
                return false;
            }
        } catch (IOException e) {
            log.error("jackson get boolean error, json: {}, key: {}", json, key, e);
            return false;
        }
    }
    public static byte[] getByte(String json, String key) {
        if (StringUtils.isEmpty(json)) {
            return null;
        }
        try {
            JsonNode node = mapper.readTree(json);
            if (null != node) {
                return node.get(key).binaryValue();
            } else {
                return null;
            }
        } catch (IOException e) {
            log.error("jackson get byte error, json: {}, key: {}", json, key, e);
            return null;
        }
    }
    public static  ArrayList getList(String json, String key) {
        if (StringUtils.isEmpty(json)) {
            return null;
        }
        String string = getString(json, key);
        return from(string, new TypeReference>() {});
    }
    public static  String add(String json, String key, T value) {
        try {
            JsonNode node = mapper.readTree(json);
            add(node, key, value);
            return node.toString();
        } catch (IOException e) {
            log.error("jackson add error, json: {}, key: {}, value: {}", json, key, value, e);
            return json;
        }
    }
    private static  void add(JsonNode jsonNode, String key, T value) {
        if (value instanceof String) {
            ((ObjectNode) jsonNode).put(key, (String) value);
        } else if (value instanceof Short) {
            ((ObjectNode) jsonNode).put(key, (Short) value);
        } else if (value instanceof Integer) {
            ((ObjectNode) jsonNode).put(key, (Integer) value);
        } else if (value instanceof Long) {
            ((ObjectNode) jsonNode).put(key, (Long) value);
        } else if (value instanceof Float) {
            ((ObjectNode) jsonNode).put(key, (Float) value);
        } else if (value instanceof Double) {
            ((ObjectNode) jsonNode).put(key, (Double) value);
        } else if (value instanceof BigDecimal) {
            ((ObjectNode) jsonNode).put(key, (BigDecimal) value);
        } else if (value instanceof BigInteger) {
            ((ObjectNode) jsonNode).put(key, (BigInteger) value);
        } else if (value instanceof Boolean) {
            ((ObjectNode) jsonNode).put(key, (Boolean) value);
        } else if (value instanceof byte[]) {
            ((ObjectNode) jsonNode).put(key, (byte[]) value);
        } else {
            ((ObjectNode) jsonNode).put(key, to(value));
        }
    }
    public static String remove(String json, String key) {
        try {
            JsonNode node = mapper.readTree(json);
            ((ObjectNode) node).remove(key);
            return node.toString();
        } catch (IOException e) {
            log.error("jackson remove error, json: {}, key: {}", json, key, e);
            return json;
        }
    }
    public static  String update(String json, String key, T value) {
        try {
            JsonNode node = mapper.readTree(json);
            ((ObjectNode) node).remove(key);
            add(node, key, value);
            return node.toString();
        } catch (IOException e) {
            log.error("jackson update error, json: {}, key: {}, value: {}", json, key, value, e);
            return json;
        }
    }
    public static String format(String json) {
        try {
            JsonNode node = mapper.readTree(json);
            return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(node);
        } catch (IOException e) {
            log.error("jackson format json error, json: {}", json, e);
            return json;
        }
    }
    public static boolean isJson(String json) {
        try {
            mapper.readTree(json);
            return true;
        } catch (Exception e) {
            log.error("jackson check json error, json: {}", json, e);
            return false;
        }
    }
    private static InputStream getResourceStream(String name) {
        return JsonUtil.class.getClassLoader().getResourceAsStream(name);
    }
    private static InputStreamReader getResourceReader(InputStream inputStream) {
        if (null == inputStream) {
            return null;
        }
        return new InputStreamReader(inputStream, StandardCharsets.UTF_8);
    }
}
1.5.3 #### JsonResult
package cn.tedu.web.util;
import lombok.Getter;
import lombok.Setter;
@Getter
@Setter
public class JsonResult {
    /** 成功 */
    public static final int SUCCESS = 200;
    /** 没有登录 */
    public static final int NOT_LOGIN = 400;
    /** 发生异常 */
    public static final int EXCEPTION = 401;
    /** 系统错误 */
    public static final int SYS_ERROR = 402;
    /** 参数错误 */
    public static final int PARAMS_ERROR = 403;
    /** 不支持或已经废弃 */
    public static final int NOT_SUPPORTED = 410;
    /** AuthCode错误 */
    public static final int INVALID_AUTHCODE = 444;
    /** 太频繁的调用 */
    public static final int TOO_FREQUENT = 445;
    /** 未知的错误 */
    public static final int UNKNOWN_ERROR = 499;
    private int code;
    private String msg;
    private T data;
    public static JsonResult build() {
        return new JsonResult();
    }
    public static JsonResult build(int code) {
        return new JsonResult().code(code);
    }
    public static JsonResult build(int code, String msg) {
        return new JsonResult().code(code).msg(msg);
    }
    public static  JsonResult build(int code, T data) {
        return new JsonResult().code(code).data(data);
    }
    public static  JsonResult build(int code, String msg, T data) {
        return new JsonResult().code(code).msg(msg).data(data);
    }
    public JsonResult code(int code) {
        this.code = code;
        return this;
    }
    public JsonResult msg(String msg) {
        this.msg = msg;
        return this;
    }
    public JsonResult data(T data) {
        this.data = data;
        return this;
    }
    public static JsonResult ok() {
        return build(SUCCESS);
    }
    public static JsonResult ok(String msg) {
        return build(SUCCESS, msg);
    }
    public static  JsonResult ok(T data) {
        return build(SUCCESS, data);
    }
    public static JsonResult err() {
        return build(EXCEPTION);
    }
    public static JsonResult err(String msg) {
        return build(EXCEPTION, msg);
    }
    @Override
    public String toString() {
        return JsonUtil.to(this);
    }
}

2. 创建item service 商品服务项目

2.1 创建sp02-itemservice项目

image.png

2.2 编辑pom.xml文件



   4.0.0
   
      org.springframework.boot
      spring-boot-starter-parent
      2.3.7.RELEASE
       
 
   com.tedu
   sp02-itemservice
   0.0.1-SNAPSHOT
   sp02-itemservice
   Demo project for Spring Boot
   
      1.8
   
   
      
         org.springframework.boot
         spring-boot-starter-web
      
      
         org.springframework.boot
         spring-boot-starter-test
         test
         
            
               org.junit.vintage
               junit-vintage-engine
            
         
      
      
         com.tedu
         sp01-commons
         1.0-SNAPSHOT
      
   
   
      
         
            org.springframework.boot
            spring-boot-maven-plugin
         
      
   

2.3 修改application.yml

首先将application.propertie改为application.yml

#应用名:作为"服务id",注册到注册中心
spring:
  application:
    name: item-service
# 端口号分别为:8001, 8101, 8201
service:
  port: 8001

2.4 编辑ItemServiceImpl

import cn.tedu.sp01.pojo.Item;
import cn.tedu.sp01.service.ItemService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import java.util.ArrayList;
import java.util.List;
@Service
@Slf4j
public class ItemServiceImpl implements ItemService {
    //根据订单id获取商品列表
 @Override
 public List getItems(String orderId) {
        ArrayList list = new ArrayList();
        list.add(new Item(1, "商品 1",1));
        list.add(new Item(2, "商品 2",2));
        list.add(new Item(3, "商品 3",3));
        list.add(new Item(4, "商品 4",4));
        list.add(new Item(5, "商品 5",5));
        return list;
    }
    //减少商品库存
 @Override
 public void decreaseNumber(List items) {
        for (Item item:items){
            log.info("减少商品库存:"+item);
        }
    }
}

2.5 编辑ItemController

package com.tedu.sp02.item.controller;
import cn.tedu.sp01.pojo.Item;
import cn.tedu.sp01.service.ItemService;
import cn.tedu.web.util.JsonResult;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@Slf4j
public class ItemController {
    @Autowired
 private ItemService itemService;
    //注入端口号:为了配置多台集群服务器
 @Value("${server.port}")
    private int port;
    @GetMapping("/{orderId}")
    public JsonResult>getItems(@PathVariable String orderId){
        log.info("orderId"+orderId+",port+"+port);
        List items= itemService.getItems(orderId);
        return JsonResult.ok().msg("port="+port).data(items);
    }
    //只处理post请求
 //@RequestBody:完整接受请求协议体数据
 @PostMapping("/decreaseNumber")
    public JsonResult decreaseNumber(@RequestBody List items){
        itemService.decreaseNumber(items);
        return JsonResult.ok().msg("减少商品库存成功");
    }
}

2.6 Spring MVC 接收参数的注解说明

接收参数

2.7 访问测试

根据orderid,查询商品
http://localhost:8001/35
减少商品库存
http://localhost:8001/decreaseNumber
使用postman,POST发送以下格式数据:
[{"id":1, "name":"abc", "number":23},{"id":2, "name":"def", "number":11}]
image.png

3. userservice 用户服务项目

3.1 创建sp03-userservice项目

image.png

3.2 编辑pom.xml文件



   4.0.0
   
      org.springframework.boot
      spring-boot-starter-parent
      2.3.7.RELEASE
       
 
   com.tedu
   sp03-userservice
   0.0.1-SNAPSHOT
   sp03-userservice
   Demo project for Spring Boot
   
      1.8
   
   
      
         org.springframework.boot
         spring-boot-starter-web
      
      
         com.tedu
         sp01-commons
         1.0-SNAPSHOT
      
      
         org.springframework.boot
         spring-boot-starter-test
         test
         
            
               org.junit.vintage
               junit-vintage-engine
            
         
      
   
   
      
         
            org.springframework.boot
            spring-boot-maven-plugin
         
      
   

3.3 修改application.yml

首先将application.propertie改为application.yml

#应用名:作为"服务id",注册到注册中心
spring:
  application:
    name: user-service
#端口号
server:
  port: 8101
#自定义配置属性
#配置三个测试用的用户数据
sp:
  user-service:
    users: "[{"id":7, "username":"abc","password":"123"},{"id":8, "username":"def","password":"456"},{"id":9, "username":"ghi","password":"789"}]"

3.4 编辑 UserServiceImpl

package com.tedu.sp03.service;
import cn.tedu.sp01.pojo.User;
import cn.tedu.sp01.service.UserService;
import cn.tedu.web.util.JsonUtil;
import com.fasterxml.jackson.core.type.TypeReference;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import java.util.List;
@Slf4j
@Service
public class UserServiceImpl implements UserService {
    @Value("${sp.user-service.users}")
    private String userJson;
    @Override
 public User getUser(Integer userId) {
        log.info("获取用户,userId="+userId);
        //userJson 转成 List //new TypeReference>(){} 只是为了使用匿名内部类继承的语法格式,写中间的 List 类型
 //
 List users=JsonUtil.from(userJson, new TypeReference>(){});
        for (User user:users){
            if (user.getId().equals(userId)){
                return user;
            }
        }
        //找不到用户,也返回一个假的用户数据
 return new User(userId,"用户名"+userId,"密码"+userId);
    }
    @Override
 public void addScore(Integer userId, Integer score) {
        log.info("增加用户积分,userId="+userId+",score="+score);
    }
}

3.5 编辑 UserController

package com.tedu.sp03.controller;
import cn.tedu.sp01.pojo.User;
import cn.tedu.sp01.service.UserService;
import cn.tedu.web.util.JsonResult;
import lombok.extern.slf4j.Slf4j;
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;
@RestController
@Slf4j
public class UserController {
    @Autowired
 private UserService userService;
    @GetMapping("/{UserId}")
    public JsonResult getUser(@PathVariable Integer userId){
        User user= userService.getUser(userId);
        return JsonResult.ok(user);
    }
    @GetMapping("/{userIs}/score")
    public JsonResult addScore(@PathVariable Integer userId,Integer score){
        userService.addScore(userId,score);
        return JsonResult.ok().msg("用户积分添加成功");
    }
}

3.6 测试

根据userid查询用户信息
http://localhost:8101/7
根据userid,为用户增加积分
http://localhost:8101/7/score?score=100

4. order service 订单服务项目

4.1 创建sp04-orderservice项目

image.png

4.2 编辑pom.xml文件



   4.0.0
   
      org.springframework.boot
      spring-boot-starter-parent
      2.3.7.RELEASE
       
 
   com.tedu
   sp04-orderservice
   0.0.1-SNAPSHOT
   sp04-orderservice
   Demo project for Spring Boot
   
      1.8
   
   
      
         org.springframework.boot
         spring-boot-starter-web
      
      
         com.tedu
         sp01-commons
         1.0-SNAPSHOT
      
      
         org.springframework.boot
         spring-boot-starter-test
         test
         
            
               org.junit.vintage
               junit-vintage-engine
            
         
      
   
   
      
         
            org.springframework.boot
            spring-boot-maven-plugin
         
      
   

3.3 修改application.yml

首先将application.propertie改为application.yml

#应用名:作为"服务id",注册到注册中心
spring:
  application:
  name: order-service
#端口号
server:
  port: 8201

4.4 编辑 OrderServiceImpl

package com.tedu.sp04.service;
import cn.tedu.sp01.pojo.Order;
import cn.tedu.sp01.service.OrderService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
@Slf4j
@Service
public class OrderServiceImpl implements OrderService {
    @Override
 public Order getOrder(String orderId) {
        log.info("获取订单,orderId="+orderId);
        //假订单数据
 Order order=new Order();
        order.setId(orderId);
        //TODO:远程调用用户,获取用户信息
 //order.setUser(用户数据);
 //TODO:远程调用商品,获取商品列表
 //order.setItems(商品列表);
 return null;
    }
    @Override
 public void addOrder(Order order) {
        log.info("添加订单:"+order);
        //TODO:远程调用商品,减少商品库存
 //TODO:远程调用用户,添加用户积分
 }
}

4.5 编辑 OrderController

package com.tedu.sp04.controller;
import cn.tedu.sp01.pojo.Item;
import cn.tedu.sp01.pojo.Order;
import cn.tedu.sp01.pojo.User;
import cn.tedu.sp01.service.OrderService;
import cn.tedu.web.util.JsonResult;
import lombok.extern.slf4j.Slf4j;
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;
import java.util.Arrays;
@Slf4j
@RestController
public class OrderController {
    @Autowired
 private OrderService orderService;
    @GetMapping("/{orderId}")
    public JsonResult getOrder(@PathVariable String OrderId){
        Order order=orderService.getOrder(OrderId);
        return JsonResult.ok().data(order);
    }
    @GetMapping("/")
    public JsonResult addOrder(){
        Order order=new Order();
        order.setId("123");
        order.setUser(new User(8,null,null));
        order.setItems(Arrays.asList(new Item[]{
                new Item(1,"商品1",2),
                new Item(2,"商品2",1),
                new Item(3,"商品3",3),
                new Item(4,"商品4",1),
                new Item(5,"商品5",5),
        }));
        orderService.addOrder(order);
        return JsonResult.ok().msg("保存订单成功");
    }
}

4.6 测试

根据orderid,获取订单
http://localhost:8201/123abc
保存订单,观察控制台日志输出
[http://localhost:8201/](http://localhost:8201

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