HttpURLConnection：网络下载数据的工具类

来源：互联网发布：php程序设计是做什么的编辑：程序博客网时间：2024/04/29 21:20

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
* 网络下载数据的工具类
*
* @author Administrator
*
*/
public class HttpUtils {
   /**
   * 根据给定的网络地址，获取对应的数据资源
   *
   * @param baseUrl
   * @return
   */
   public static byte[] getDataFromNetWork(String baseUrl) {
       try {
           URL url = new URL(baseUrl);
           HttpURLConnection connection = (HttpURLConnection) url.openConnection();
           connection.setRequestMethod("GET");
           connection.setConnectTimeout(5000);
           int responseCode = connection.getResponseCode();
           System.out.println("响应码：" + responseCode);
           if (responseCode == HttpURLConnection.HTTP_OK) {
               InputStream inputStream = connection.getInputStream();
               ByteArrayOutputStream baos = new ByteArrayOutputStream();
               byte[] bs = new byte[1024];
               int len = 0;
               while ((len = inputStream.read(bs)) != -1) {
                   baos.write(bs, 0, len);
               }
               return baos.toByteArray();
           }
       } catch (MalformedURLException e) {
           e.printStackTrace();
       } catch (IOException e) {
           e.printStackTrace();
       }
       return null;
   }

   public static String getJsonFromNetWork(String baseUrl) {
       byte[] data = getDataFromNetWork(baseUrl);
       if (data != null && data.length > 0) {
           return new String(data);
       }
       return null;
   }
}

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