springboot调用天气预报接口

Spring Boot可以使用RestTemplate来调用天气预报接口。以下是一个简单的示例：

1.添加依赖

在pom.xml文件中添加以下依赖：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
</dependency>

2.创建一个Weather类

public class Weather {
    private String city;
    private String temperature;
    private String description;

    // 省略getter和setter方法
}

3.创建一个WeatherService类

@Service
public class WeatherService {
    private RestTemplate restTemplate;

    @Autowired
    public WeatherService(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    public Weather getWeather(String city) {
        String url = "http://api.openweathermap.org/data/2.5/weather?q={city}&appid={appId}&units=metric";
        String appId = "your_app_id_here"; // 请替换成你自己的App ID

        Map<String, String> params = new HashMap<>();
        params.put("city", city);
        params.put("appId", appId);

        WeatherResponse response = restTemplate.getForObject(url, WeatherResponse.class, params);

        Weather weather = new Weather();
        weather.setCity(response.getName());
        weather.setTemperature(response.getMain().getTemp() + " °C");
        weather.setDescription(response.getWeather().get(0).getDescription());

        return weather;
    }
}

注意：这里WeatherResponse类是用来解析JSON响应的，需要根据接口返回的JSON数据结构自行编写。

4.创建一个WeatherController类

@RestController
public class WeatherController {
    private WeatherService weatherService;

    @Autowired
    public WeatherController(WeatherService weatherService) {
        this.weatherService = weatherService;
    }

    @GetMapping("/weather/{city}")
    public Weather getWeather(@PathVariable String city) {
        return weatherService.getWeather(city);
    }
}

现在可以启动应用程序并访问http://localhost:8080/weather/{city}来获取指定城市的天气预报。