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‎SUMMARY.md‎

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*[微服务架构概述](docs/msa-boot/msa-boot-overview.md)
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*[微服务 API 设计原则](docs/msa-boot/msa-boot-api.md)
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*[微服务存储设计原则](docs/msa-boot/msa-boot-store.md)
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*[第一个微服务实现——天气预报服务](docs/msa-boot/first-api.md) （完）
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*[第一个微服务实现——天气预报服务](https://waylau.com/spring-boot-weather-report/) （完）
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*[微服务的注册与发现](docs/register-discover/register-discover.md)
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*[服务发现的意义](docs/register-discover/discover-meaning.md)
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*[如何集成Eureka](docs/register-discover/eureka.md)

‎docs/msa-boot/first-api.md‎

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#第一个微服务实现——天气预报服务
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本章节，我们将基于 Spring Boot 技术来实现我们的第一个微服务天气预报应用——micro-weather。micro-weather 的作用是实现天气预报功能，可以根据不同的城市，查询该城市的实时天气情况。
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本章节，我们将基于 Spring Boot 技术来实现我们的第一个微服务天气预报应用——micro-weather-basic。micro-weather-basic 的作用是实现简单的天气预报功能，可以根据不同的城市，查询该城市的实时天气情况。
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##开发环境
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理论上，天气的数据是天气预报的实现基础。本应用与实际的天气数据无关，理论上，可以兼容多种数据来源。但为求简单，我们在网上找了一个免费、可用的天气数据接口。
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* 天气数据来源为中华万年历。
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* 天气数据来源为中华万年历。例如：
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* 通过城市名字获得天气数据 ：<http://wthrcdn.etouch.cn/weather_mini?city=深圳>
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* 通过城市id获得天气数据：<http://wthrcdn.etouch.cn/weather_mini?citykey=101280601>
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* 城市ID列表。每个城市都有一个唯一的ID作为标识。见<http://cj.weather.com.cn/support/Detail.aspx?id=51837fba1b35fe0f8411b6df> 或者<http://mobile.weather.com.cn/js/citylist.xml>。
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天气调用，接口示例，我们以“深圳”城市为例，访问：
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* 通过城市名字获得天气数据 ：<http://wthrcdn.etouch.cn/weather_mini?city=深圳>
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* 通过城市id获得天气数据：<http://wthrcdn.etouch.cn/weather_mini?citykey=101280601>
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可用看到如下天气数据返回。
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调用天气服务接口示例，我们以“深圳”城市为例，可用看到如下天气数据返回。
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```json
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{
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//...
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}
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```
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##创建天气信息实体 WeatherInfo
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##创建天气信息相关的值对象
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创建`com.waylau.spring.cloud.vo`包，用于相关值对象。创建天气信息实体 Weather
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创建`com.waylau.spring.cloud.vo`包，用于相关值对象。创建天气信息类 Weather
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```java
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```java
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publicclassWeatherResponseimplementsSerializable {
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privatestaticfinallong serialVersionUID=1L;
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privateWeather data;// 消息数据
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privateString status;// 消息状态
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privateString desc;// 消息描述
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privatestaticfinallong serialVersionUID=1L;
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privateWeather data;// 消息数据
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privateString status;// 消息状态
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privateString desc;// 消息描述
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publicWeathergetData() {
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return data;
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}
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publicvoidsetData(Weatherdata) {
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this.data= data;
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}
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publicStringgetStatus() {
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return status;
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}
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publicvoidsetStatus(Stringstatus) {
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this.status= status;
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}
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publicStringgetDesc() {
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return desc;
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}
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publicvoidsetDesc(Stringdesc) {
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this.desc= desc;
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}
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}
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```
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##服务接口及实现
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```java
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@Service
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publicclassWeatherDataServiceImplimplementsWeatherDataService {
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@Autowired
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privateRestTemplate restTemplate;
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privatefinalStringWEATHER_API="http://wthrcdn.etouch.cn/weather_mini";
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@Autowired
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privateRestTemplate restTemplate;
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privatefinalStringWEATHER_API="http://wthrcdn.etouch.cn/weather_mini";
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@Override
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publicWeatherResponsegetDataByCityId(StringcityId) {
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String uri=WEATHER_API+"?citykey="+ cityId;
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@Override
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publicWeatherResponsegetDataByCityName(StringcityName) {
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String uri=WEATHER_API+"?city="+ cityName;
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String uri=WEATHER_API+"?city="+ cityName;
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returnthis.doGetWeatherData(uri);
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}
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privateWeatherResponsedoGetWeatherData(Stringuri) {
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ResponseEntity<String> response= restTemplate.getForEntity(uri,String.class);
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String strBody=null;
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if (response.getStatusCodeValue()==200) {
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strBody= response.getBody();
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}
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ObjectMapper mapper=newObjectMapper();
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ObjectMapper mapper=newObjectMapper();
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WeatherResponse weather=null;
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try {
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weather= mapper.readValue(strBody,WeatherResponse.class);
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}catch (IOException e) {
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e.printStackTrace();
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}
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}
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return weather;
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}
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![weather-data](../../images/msa-boot/weather-data.jpg)
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##源码
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本章节的源码，在`micro-weather-basic`目录下。

‎images/msa-boot/weather-data.jpg‎

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‎samples/micro-weather-basic/src/main/java/com/waylau/spring/cloud/service/WeatherDataServiceImpl.java‎

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* 天气数据服务.
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*
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* @since 1.0.0 2017年9月2日
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* @author <a href="https://waylau.com">Way Lau</a>
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* @author <a href="https://waylau.com">Way Lau</a>
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*/
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@Service
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publicclassWeatherDataServiceImplimplementsWeatherDataService {
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@Autowired
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privateRestTemplaterestTemplate;
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privatefinalStringWEATHER_API="http://wthrcdn.etouch.cn/weather_mini";
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@Autowired
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privateRestTemplaterestTemplate;
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privatefinalStringWEATHER_API ="http://wthrcdn.etouch.cn/weather_mini";
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@Override
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publicWeatherResponsegetDataByCityId(StringcityId) {
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Stringuri =WEATHER_API +"?citykey=" +cityId;
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publicWeatherResponsegetDataByCityName(StringcityName) {
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Stringuri =WEATHER_API +"?city=" +cityName;
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Stringuri =WEATHER_API +"?city=" +cityName;
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returnthis.doGetWeatherData(uri);
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}
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privateWeatherResponsedoGetWeatherData(Stringuri) {
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ResponseEntity<String>response =restTemplate.getForEntity(uri,String.class);
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StringstrBody =null;
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if (response.getStatusCodeValue() ==200) {
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strBody =response.getBody();
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}
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ObjectMappermapper =newObjectMapper();
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ObjectMappermapper =newObjectMapper();
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WeatherResponseweather =null;
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try {
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weather =mapper.readValue(strBody,WeatherResponse.class);
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}catch (IOExceptione) {
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e.printStackTrace();
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}
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}
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returnweather;
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}
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‎samples/micro-weather-basic/src/main/java/com/waylau/spring/cloud/vo/WeatherResponse.java‎

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* 返回消息对象.
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*
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* @since 1.0.0 2017年9月2日
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* @author <a href="https://waylau.com">Way Lau</a>
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* @author <a href="https://waylau.com">Way Lau</a>
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*/
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publicclassWeatherResponseimplementsSerializable {
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privatestaticfinallongserialVersionUID =1L;
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privateWeatherdata;// 消息数据
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privateStringstatus;// 消息状态
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privateStringdesc;// 消息描述
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privatestaticfinallongserialVersionUID =1L;
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privateWeatherdata;// 消息数据
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privateStringstatus;// 消息状态
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privateStringdesc;// 消息描述
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publicWeathergetData() {
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returndata;
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}
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publicvoidsetData(Weatherdata) {
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this.data =data;
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}
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publicStringgetStatus() {
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returnstatus;
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}
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publicvoidsetStatus(Stringstatus) {
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this.status =status;
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}
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publicStringgetDesc() {
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returndesc;
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}
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publicvoidsetDesc(Stringdesc) {
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this.desc =desc;
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}
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}

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