Server returned HTTP response code: 502 for URL:？？？？

[llq20107760428]

用Java写爬虫爬取网页返回java.io.IOException: Server returned HTTP response code: 502 for URL: ？？？
我已设置代理 conn.setRequestProperty("User-Agent",
"Mozilla/5.0 (Windows NT 6.2; " +
"WOW64; rv:20.0) ");
还是无法访问
求各位大神是怎么解决？

[llq20107760428]

求大神快点回复啊、、、急急急

[llq20107760428]

具体代码： public class HttpRequestUtil { public String Pages(String urlStr) { StringBuffer html = new StringBuffer(); String result = null; try { URL url = new URL(urlStr); URLConnection conn = url.openConnection(); conn.setRequestProperty( "User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:28.0)"); BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "gb2312"));// 读取网页全部内容 while ((result = in.readLine()) != null) { html.append(result); } in.close(); } catch (final MalformedURLException me) { System.out.println("你输入的URL格式有问题!"); me.getMessage(); } catch (final IOException e) { e.printStackTrace(); } //System.out.println(html.toString()); return html.toString(); } public static void main(String[] args) { HttpRequestUtil h = new HttpRequestUtil(); try { h.Pages("http://ypk.39.net/manual/500164/0/"); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }

[花谢尊前不敢香]

还是改为httpclient 访问吧，原生的毕竟知识基本的，一个网络设置，还是httpclient 封装的比较好。

[llq20107760428]

有什么区别吗，这样还是屏蔽吧

[llq20107760428]

[花谢尊前不敢香]

自己动手试了没有，就说没区别。