工具类

package zjq.com;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class Gjb {

public static String getJson(String urlString){

    try {
        URL url=new URL(urlString);

        try {
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

            int responseCode = urlConnection.getResponseCode();

            if (responseCode==200){

                InputStream inputStream = urlConnection.getInputStream();

                BufferedReader reader=new BufferedReader(new InputStreamReader(inputStream));

                StringBuilder builder=new StringBuilder();

                String a="";

                String b="";

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

                    b+=a;

                }

                return b;
            }

        } catch (IOException e) {
            e.printStackTrace();
        }

    } catch (MalformedURLException e) {
        e.printStackTrace();
    }

    return null;
}

}