調用api接口(怎么調用api接口)

1、API調用的第一步：購買API接口

關于API的購買這里就不過多陳述，網上一搜一大把,我這次教程使用的API是天行數據的API

2、獲取ID和Key （類似賬號密碼）

這里就把我的KEY送給大家免費調用：

這個是查詢全國疫情信息的API—可使用次數：100000

key=d557d60eeebe9fa695424a6e3930a8fd

1

3.使用你需要的請求示例（API文檔里會有）

3.使用API文檔里的請求示例（）

public class DataTest {

public static String request(String httpUrl, String httpArg) {

BufferedReader reader = null;

String result = null;

StringBuffer sbf = new StringBuffer();

//httpUrl = httpUrl + "?" + httpArg;

try {

URL url = new URL(httpUrl);

HttpURLConnection connection = (HttpURLConnection) url

.openConnection();

connection.tRequestMethod("GET");

InputStream is = connection.getInputStream();

reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));

String strRead = null;

while ((strRead = reader.readLine()) != null) {

sbf.append(strRead);

sbf.append(" ");

}

reader.clo();

result = sbf.toString();

} catch (Exception e) {

e.printStackTrace();

}

return result;

}

public static void main(String[] args) {

/**

* @param urlAll

* :請求接口

* @param httpArg

* :參數

* @return 返回結果

*/

String httpUrl = "http://api.tianapi.com/txapi/ncovcity/index?key=d557d60eeebe9fa695424a6e3930a8fd";

String httpArg="";

System.out.println(request(httpUrl,httpArg));

}

}

測試效果：

4.請求參數

5、添加請求參數，查詢2020年3月12日的全國疫情數據

修改后的代碼

public static String request(String httpUrl, String httpArg) {

BufferedReader reader = null;

String result = null;

StringBuffer sbf = new StringBuffer();

httpUrl = httpUrl + "&" + httpArg;

try {

URL url = new URL(httpUrl);

HttpURLConnection connection = (HttpURLConnection) url

.openConnection();

connection.tRequestMethod("GET");

InputStream is = connection.getInputStream();

reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));

String strRead = null;

while ((strRead = reader.readLine()) != null) {

sbf.append(strRead);

sbf.append(" ");

}

reader.clo();

result = sbf.toString();

} catch (Exception e) {

e.printStackTrace();

}

return result;

}

public static void main(String[] args) {

/**

* @param urlAll

* :請求接口

* @param httpArg

* :參數

* @return 返回結果

*/

String httpUrl = "http://api.tianapi.com/txapi/ncovcity/index?key=d557d60eeebe9fa695424a6e3930a8fd";

String httpArg="date=2020-03-12";

System.out.println(request(httpUrl,httpArg));

}

}

測試結果