通过httpClient访问第三方API

2019-11-06 09:00:38

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一个访问知心天气的demo，知心天气官方API详情可见：http://www.thinkpage.cn/doc#now 这里只做其中的逐日天气预报和昨日天气，此接口属于其中的免费接口，可以获取指定地区，指定时间段内的天气信息。

创建项目，引入依赖

<parent> <groupId>org.sPRingframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.4.1.RELEASE</version> </parent> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <scope>test</scope> </dependency>  <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>  <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> </dependency>  <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.3.6</version> </dependency>  <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.4</version> </dependency> </dependencies>

创建请求实体ZhiXinRequest

private String method; private String location; private String language; private String start; private String days; private String unit; //省略set,get...

创建响应实体ZhiXinResponse

public class ZhiXinResponse { private List<Results> results; private String status; private String status_code; //省略set,get...}public class Results { private Location location; private List<Daily> daily; private String last_update; //省略set,get... class Daily { private String date; private String text_day; private String code_day; private String text_night; private String code_night; private String high; private String low; private String precip; private String wind_scale; //省略set,get... } class Location { private String id; private String name; private String country; private String path; private String timezone; private String timezone_offset; //省略set,get... }}

创建ZhiXinAPI，具体的接口参数规则见：http://www.thinkpage.cn/doc#now

public class ZhiXinAPI { // 要访问的地址 private String url = "https://api.thinkpage.cn/v3"; // API密钥（虽然是免费的接口，但是暴露出来不知道会不会有问题~~） private String authKey = "?key=9qwasjjhtafmbxz7"; // 创建默认的httpClient实例 private CloseableHttpClient client = HttpClients.custom().build(); /** * 发送请求，接收返回信息。 * 只作为demo，忽略异常，未关闭连接 */ public ZhiXinResponse sendRequest(ZhiXinRequest zhiXinRequest) throws ParseException, IOException { // 组装对象 url = url + zhiXinRequest.getMethod() + authKey; if (zhiXinRequest.getLocation() != null) { url = url + "&location=" + zhiXinRequest.getLocation(); } if (zhiXinRequest.getStart() != null) { url = url + "&start=" + zhiXinRequest.getStart(); } if (zhiXinRequest.getDays() != null) { url = url + "&days=" + zhiXinRequest.getDays(); } // 创建http请求(get方式) HttpGet httpGet = new HttpGet(url); httpGet.setHeader("Content-Type", "application/json-rpc"); System.out.println("httpGet: " + httpGet); // 发送请求并接收结果（这里已经接收了到了返回结果，后面的代码只做了一些转换） HttpResponse httpResponse = client.execute(httpGet); String responseBody = EntityUtils.toString(httpResponse.getEntity()); ZhiXinResponse zhiXinResponse = JSON.parSEObject(responseBody, ZhiXinResponse.class); System.out.println("response: " + responseBody); return zhiXinResponse; }}

创建springboot启动类Application

@SpringBootApplicationpublic class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); }}

创建服务控制类ZhiXinController

@Controller@RestControllerpublic class ZhiXinController { @RequestMapping("daily") public String getWeatherDaily(String location, String days) throws ParseException, IOException { ZhiXinRequest zhiXinRequest = new ZhiXinRequest(); // 要查询的城市 zhiXinRequest.setLocation(location); // 要查询的天数 zhiXinRequest.setDays(days); // 要访问的接口 String method = "/weather/daily.json"; zhiXinRequest.setMethod(method); ZhiXinAPI zhiXinAPI = new ZhiXinAPI(); // 发送并接收返回的信息 ZhiXinResponse zhiXinResponse = zhiXinAPI.sendRequest(zhiXinRequest); // 将信息转换成json String result = JSON.toJSONString(zhiXinResponse); return result; }}

启动服务，通过访问http://localhost:8080/daily?location=beijing&days=1 即可得到指定的天气信息。

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