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

liangkai821025 2008-05-03 10:41:24

1: URL url = new URL("http://...");
2: URLConnection conn = url.openConnection();
3: conn.connect();
4: InputStream is = null;
5: try {
6: is = conn.getInputStream();
7: } catch (IOException e) {
8: e.printStackTrace();
9: }

程序执行到上面代码事报错，提示一下错误：
java.io.IOException: Server returned HTTP response code: 502 for URL: http://...

提示是在第六行 is = conn.getInputStream(); 的错误

502 Bad Gateway 服务器作为网关或者代理时，为了完成请求访问下一个服务器，但该服务器返回了非法的应答。

一开始还好使，在昨天突然就出现这问题了
访问其他的url，没有错误，这点说明代码应该没问题
用asp和vb.net获取我这个会报错的url也没问题！~

哪位知道怎么解决？？？？？？？？

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sunyujia 2008-05-08

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如何解决的，分享下啊兄弟。

liangkai821025 2008-05-05

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谢谢各位用httpclient 解决了小弟给大家一鞠躬哈哈多谢多谢

sunyujia 2008-05-05

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如果你十分需要这个网站的东西的话也不是不能做，java可以编写浏览器十分简单，你用自己写的浏览器当然就可以实现啦，另外你捕获下http请求，看看请求头和普通浏览器有何区别。

你要浏览器代码的话，你可以百度，或管我要也行。

nanjg 2008-05-05

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是不是和你的浏览器有关呢
502是被屏蔽的错误提示

liangkai821025 2008-05-05

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真稀罕没人能有思路~~

sunyujia 2008-05-04

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被屏蔽了，但是我尚未找到方法，正在百度中

liangkai821025 2008-05-04

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java.io.IOException: Server returned HTTP response code: 502 for URL: http://www
.amazon.cn/
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLCon
nection.java:1149)
at com.bj.service.joyo.joyoAllSearchImp.getCode(joyoAllSearchImp.java:12
0)
at com.bj.service.joyo.joyoAllSearchImp.pageTotal(joyoAllSearchImp.java:
27)
at com.bj.struts.Action.bjAction.joyoAllSearch(bjAction.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchActio
n.java:280)
at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:
216)
at org.apache.struts.action.RequestProcessor.processActionPerform(Reques
tProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.ja
va:274)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:148
2)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:284)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:204)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:257)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:567)
at org.apache.catalina.core.StandardContextValve.invokeInternal(Standard
ContextValve.java:245)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:199)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:567)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:184)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:164)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:567)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:156)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:567)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)

at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:20
6)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:833)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:732)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java
:619)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:688)
at java.lang.Thread.run(Thread.java:595)

liangkai821025 2008-05-04