【Java】调用http接口获取数据

方法如下：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Created by yl1794 on 2018/5/16.
 */
public class getHttpInterface {

    // 调用http接口获取数据
    public static String getHttpInterface(String path){
        BufferedReader in = null;
        StringBuffer result = null;
        try {
            URL url = new URL(path);
            //打开和url之间的连接
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            connection.setRequestProperty("Charset", "utf-8");
            connection.connect();

            result = new StringBuffer();
            //读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
            return result.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return null;
    }

    public static void main(String[] args){
        String str = getHttpInterface("http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip=218.4.255.255");
        System.out.println(str);
    }
}

返回结果：

{"ret":1,"start":-1,"end":-1,"country":"\u4e2d\u56fd","province":"\u6c5f\u82cf","city":"\u82cf\u5dde","district":"","isp":"","type":"","desc":""}

Process finished with exit code 0