需要引用的包

import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import net.sf.json.JSONObject;

jar包下载地址

编写代码

    public static JSONObject doGetJson(String url) {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(url);
        JSONObject jsonObject = null;
        
        try {
            HttpResponse response = httpClient.execute(httpGet);
            HttpEntity entity = response.getEntity();
            if(entity != null) {
                String result = EntityUtils.toString(entity,"UTF-8");
                jsonObject = JSONObject.fromObject(result);
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return jsonObject;
        
    }