How to set HttpResponse timeout for Android in Java
我创建了以下用于检查连接状态的函数:
1 2 3 4 5 6 7 8 9 10 11 12 13 | private void checkConnectionStatus() { HttpClient httpClient = new DefaultHttpClient(); try { String url ="http://xxx.xxx.xxx.xxx:8000/GaitLink/" + strSessionString +"/ConnectionStatus"; Log.d("phobos","performing get" + url); HttpGet method = new HttpGet(new URI(url)); HttpResponse response = httpClient.execute(method); if (response != null) { String result = getResponse(response.getEntity()); ... |
当我关闭服务器进行测试时,执行会等待很长时间
1 | HttpResponse response = httpClient.execute(method); |
有谁知道如何设置超时以避免等待太久?
谢谢!
在我的示例中,设置了两个超时。连接超时将引发
1 2 3 4 5 6 7 8 9 10 11 12 13 | HttpGet httpGet = new HttpGet(url); HttpParams httpParameters = new BasicHttpParams(); // Set the timeout in milliseconds until a connection is established. // The default value is zero, that means the timeout is not used. int timeoutConnection = 3000; HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection); // Set the default socket timeout (SO_TIMEOUT) // in milliseconds which is the timeout for waiting for data. int timeoutSocket = 5000; HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket); DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters); HttpResponse response = httpClient.execute(httpGet); |
如果要设置任何现有HTTPClient的参数(例如DefaultHttpClient或AndroidHttpClient),可以使用函数setParams()。
1 | httpClient.setParams(httpParameters); |
要在客户端上设置设置:
1 2 3 | AndroidHttpClient client = AndroidHttpClient.newInstance("Awesome User Agent V/1.0"); HttpConnectionParams.setConnectionTimeout(client.getParams(), 3000); HttpConnectionParams.setSoTimeout(client.getParams(), 5000); |
我已经在JellyBean上成功使用了它,但也适用于旧平台....
HTH
如果您使用的是Jakarta的http客户端库,那么您可以执行以下操作:
1 2 3 4 5 6 7 | HttpClient client = new HttpClient(); client.getParams().setParameter(HttpClientParams.CONNECTION_MANAGER_TIMEOUT, new Long(5000)); client.getParams().setParameter(HttpClientParams.SO_TIMEOUT, new Integer(5000)); GetMethod method = new GetMethod("http://www.yoururl.com"); method.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(5000)); method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, int statuscode = client.executeMethod(method); |
如果您使用的是默认的http客户端,请使用默认的http参数来执行此操作:
1 2 3 4 | HttpClient client = new DefaultHttpClient(); HttpParams params = client.getParams(); HttpConnectionParams.setConnectionTimeout(params, 3000); HttpConnectionParams.setSoTimeout(params, 3000); |
最初的功劳归功于http://www.jayway.com/2009/03/17/configuring-timeout-with-apache-httpclient-40/
对于那些说@ kuester2000的答案不起作用的人,请注意HTTP请求,首先尝试使用DNS请求查找主机IP,然后向服务器发出实际的HTTP请求,这样您可能还需要设置一个DNS请求超时。
如果您的代码在没有DNS请求超时的情况下工作,那是因为您可以访问DNS服务器或者您正在访问Android DNS缓存。顺便说一句,您可以通过重新启动设备来清除此缓存。
此代码扩展了原始答案,包括使用自定义超时的手动DNS查找:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | //Our objective String sURL ="http://www.google.com/"; int DNSTimeout = 1000; int HTTPTimeout = 2000; //Get the IP of the Host URL url= null; try { url = ResolveHostIP(sURL,DNSTimeout); } catch (MalformedURLException e) { Log.d("INFO",e.getMessage()); } if(url==null){ //the DNS lookup timed out or failed. } //Build the request parameters HttpParams params = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(params, HTTPTimeout); HttpConnectionParams.setSoTimeout(params, HTTPTimeout); DefaultHttpClient client = new DefaultHttpClient(params); HttpResponse httpResponse; String text; try { //Execute the request (here it blocks the execution until finished or a timeout) httpResponse = client.execute(new HttpGet(url.toString())); } catch (IOException e) { //If you hit this probably the connection timed out Log.d("INFO",e.getMessage()); } //If you get here everything went OK so check response code, body or whatever |
使用方法:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | //Run the DNS lookup manually to be able to time it out. public static URL ResolveHostIP (String sURL, int timeout) throws MalformedURLException { URL url= new URL(sURL); //Resolve the host IP on a new thread DNSResolver dnsRes = new DNSResolver(url.getHost()); Thread t = new Thread(dnsRes); t.start(); //Join the thread for some time try { t.join(timeout); } catch (InterruptedException e) { Log.d("DEBUG","DNS lookup interrupted"); return null; } //get the IP of the host InetAddress inetAddr = dnsRes.get(); if(inetAddr==null) { Log.d("DEBUG","DNS timed out."); return null; } //rebuild the URL with the IP and return it Log.d("DEBUG","DNS solved."); return new URL(url.getProtocol(),inetAddr.getHostAddress(),url.getPort(),url.getFile()); } |
这个课程来自这篇博文。如果您将使用它,请查看备注。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | public static class DNSResolver implements Runnable { private String domain; private InetAddress inetAddr; public DNSResolver(String domain) { this.domain = domain; } public void run() { try { InetAddress addr = InetAddress.getByName(domain); set(addr); } catch (UnknownHostException e) { } } public synchronized void set(InetAddress inetAddr) { this.inetAddr = inetAddr; } public synchronized InetAddress get() { return inetAddr; } } |
一个选项是使用Square的OkHttp客户端。
添加库依赖项
在build.gradle中,包含以下行:
1 | compile 'com.squareup.okhttp:okhttp:x.x.x' |
其中
设置客户端
例如,如果要将超时设置为60秒,请执行以下操作:
1 2 3 | final OkHttpClient okHttpClient = new OkHttpClient(); okHttpClient.setReadTimeout(60, TimeUnit.SECONDS); okHttpClient.setConnectTimeout(60, TimeUnit.SECONDS); |
ps:如果你的minSdkVersion大于8,你可以使用
1 2 | okHttpClient.setReadTimeout(1, TimeUnit.MINUTES); okHttpClient.setConnectTimeout(1, TimeUnit.MINUTES); |
有关单位的更多详细信息,请参阅TimeUnit。
你可以通过Httpclient-android-4.3.5的方式创建HttpClient实例,它可以很好地工作。
1 2 3 4 5 6 | SSLContext sslContext = SSLContexts.createSystemDefault(); SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory( sslContext, SSLConnectionSocketFactory.STRICT_HOSTNAME_VERIFIER); RequestConfig.Builder requestConfigBuilder = RequestConfig.custom().setCircularRedirectsAllowed(false).setConnectionRequestTimeout(30*1000).setConnectTimeout(30 * 1000).setMaxRedirects(10).setSocketTimeout(60 * 1000); CloseableHttpClient hc = HttpClients.custom().setSSLSocketFactory(sslsf).setDefaultRequestConfig(requestConfigBuilder.build()).build(); |
如果您使用
1 2 3 | URL url = new URL(myurl); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(CONNECT_TIMEOUT); |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | HttpParams httpParameters = new BasicHttpParams(); HttpProtocolParams.setVersion(httpParameters, HttpVersion.HTTP_1_1); HttpProtocolParams.setContentCharset(httpParameters, HTTP.DEFAULT_CONTENT_CHARSET); HttpProtocolParams.setUseExpectContinue(httpParameters, true); // Set the timeout in milliseconds until a connection is // established. // The default value is zero, that means the timeout is not used. int timeoutConnection = 35 * 1000; HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection); // Set the default socket timeout (SO_TIMEOUT) // in milliseconds which is the timeout for waiting for data. int timeoutSocket = 30 * 1000; HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket); |
1 2 3 4 5 6 7 8 9 10 11 12 13 | public boolean isInternetWorking(){ try { int timeOut = 5000; Socket socket = new Socket(); SocketAddress socketAddress = new InetSocketAddress("8.8.8.8",53); socket.connect(socketAddress,timeOut); socket.close(); return true; } catch (IOException e) { //silent } return false; } |