新浪微博登录遇到的问题：在获取code抛出异常WeiboException
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? ? Lost modified：2013-10-10 14:17:35
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? ? 今天测试突然发来文档说有时使用微博登录时会出500错误。查看了后台的代码抛出的异常如下：
2013-10-10 09:54:32 ERROR [WeiboLogin.java:89] cc.com.pinche.web.controller.WeiboLogin.loginBySinaWeibo() - 新浪微博错误weibo4j.model.WeiboException: localhost.hao231: localhost.hao231at weibo4j.http.HttpClient.httpRequest(HttpClient.java:422)at weibo4j.http.HttpClient.httpRequest(HttpClient.java:371)at weibo4j.http.HttpClient.get(HttpClient.java:203)at weibo4j.Users.showUserById(Users.java:28)at cc.com.pinche.web.controller.WeiboLogin.loginBySinaWeibo(WeiboLogin.java:87)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)at java.lang.reflect.Method.invoke(Method.java:597)at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:436)at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:424)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)at java.lang.Thread.run(Thread.java:662)Caused by: java.net.UnknownHostException: localhost.hao231: localhost.hao231at java.net.InetAddress.getLocalHost(InetAddress.java:1360)at weibo4j.http.HttpClient.httpRequest(HttpClient.java:379)... 37 moreweibo4j.model.WeiboException: localhost.hao231: localhost.hao231at weibo4j.http.HttpClient.httpRequest(HttpClient.java:422)at weibo4j.http.HttpClient.httpRequest(HttpClient.java:371)at weibo4j.http.HttpClient.get(HttpClient.java:203)at weibo4j.Users.showUserById(Users.java:28)at cc.com.pinche.web.controller.WeiboLogin.loginBySinaWeibo(WeiboLogin.java:87)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)at java.lang.reflect.Method.invoke(Method.java:597)at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:436)at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:424)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)at java.lang.Thread.run(Thread.java:662)Caused by: java.net.UnknownHostException: localhost.hao231: localhost.hao231at java.net.InetAddress.getLocalHost(InetAddress.java:1360)at weibo4j.http.HttpClient.httpRequest(HttpClient.java:379)... 37 more
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? ? 查看错误提示的message很特殊是我服务器的名字localhost.hao231，在新浪微博论坛发现也有很很多人遇到这样的问题。
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? ? 首先来说说解决方法：
?? ?1.若你部署再linux，那么你先获取下机器主机名：通过命令：hostname，其实在异常UnknownHostException:后面已经显示了你的机器名（我的就是localhost.hao231）.
? ? 2.接着在/etc/hosts中配置相应的loopback（回环地址），添加如下:
? ? ? ?127.0.0.1 localhost?
? ? ? ?127.0.0.1 localhost.hao231
? ? ? （当然你也可以这样添加 : www.example.com(你的网站域名) ?localhost.hao231）
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? ? 解决问题的关键就是：Caused by: java.net.UnknownHostException
? ? 新浪weibo4j.http.HttpClient.java的源码摘录如下：
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public Response httpRequest(HttpMethod method, Boolean WithTokenHeader)throws WeiboException {InetAddress ipaddr;int responseCode = -1;try {ipaddr = InetAddress.getLocalHost();//UnknownHostException就是在这里抛出的，在向新浪发送请求时获取了请求端服务器的ip或 host name List<Header> headers = new ArrayList<Header>();if (WithTokenHeader) {if (token == null) {throw new IllegalStateException("Oauth2 token is not set!");}headers.add(new Header("Authorization", "OAuth2 " + token));headers.add(new Header("API-RemoteIP", ipaddr.getHostAddress()));client.getHostConfiguration().getParams().setParameter("http.default-headers", headers);for (Header hd : headers) {log(hd.getName() + ": " + hd.getValue());}}method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,new DefaultHttpMethodRetryHandler(3, false));client.executeMethod(method);Header[] resHeader = method.getResponseHeaders();responseCode = method.getStatusCode();log("Response:");log("https StatusCode:" + String.valueOf(responseCode));for (Header header : resHeader) {log(header.getName() + ":" + header.getValue());}Response response = new Response();response.setResponseAsString(method.getResponseBodyAsString());log(response.toString() + "\n");if (responseCode != OK){try {throw new WeiboException(getCause(responseCode),response.asJSONObject(), method.getStatusCode());} catch (JSONException e) {e.printStackTrace();}}return response;} catch (IOException ioe) {throw new WeiboException(ioe.getMessage(), ioe, responseCode);} finally {method.releaseConnection();}}? ??
? getLocalHost()方法介绍:
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? ??Returns the local host.
If there is a security manager, its checkConnect method is called with the local host name and -1 as its arguments to see if the operation is allowed. If the operation is not allowed, an InetAddress representing the loopback address is returned.
host could be found.See Also:SecurityManager.checkConnect?