上週樂視網cms香港接口,數據刷新緩慢。香港運營人員一直在羣裏反饋tv端內容不更新。html
我觀察了下服務器,發現請求接口耗時好久500~6000ms。以前通常都是100ms左右。java
致使不少線程一直在waiting狀態,等待網絡io。apache
因此首先找運維解決問題,原來運維人員鳥悄的給咱們中港專線限速了,😓汗一個。服務器
後來運維給恢復後系統正常。網絡
其實,看到6000ms的時候,內心咯噔一下,我記得我設置的超時時間是5000ms啊(業務須要,單條數據很大)。多線程
原來讀取超時時間沒生效,只生效了鏈接超時時間。因此網上找了資料,介紹的很詳細,試了下沒問題。app
尊重博主原創,特貼博客連接。copy下來只怕之後連接失效或刪掉。運維
轉自:http://blog.csdn.net/hi_kevin/article/details/32316171socket
HttpClient在使用中有兩個超時時間,是一直接觸和使用的,因爲上次工做中使用httpClient形成了系統悲劇的狀況,特意對它的兩個超時時間進行了小小的測試,在這裏記錄下。post
測試版本爲HttpClient——3.1
一:鏈接超時:connectionTimeout
1:指的是鏈接一個url的鏈接等待時間。
2:設置方法爲:
public class TestHttpClientMain {
/** * @param args */ public static void main(String[] args) { HttpClient client = new HttpClient(); HttpMethod method = new GetMethod( "http://test.com"); client.getHttpConnectionManager().getParams() .setConnectionTimeout(3000); client.getHttpConnectionManager().getParams().setSoTimeout(3000); try { int statusCode = client.executeMethod(method); System.out.println(statusCode); byte[] responseBody = null; responseBody = method.getResponseBody(); String result = new String(responseBody); System.out.println(result); } catch (HttpException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
3:測試的時候,將url改成一個不存在的url:「http://test.com」
4:超時時間3000ms事後,系統報出異常。
org.apache.commons.httpclient.ConnectTimeoutException: The host did not accept the connection within timeout of 3000 ms
at org.apache.commons.httpclient.protocol.ReflectionSocketFactory.createSocket(ReflectionSocketFactory.java:155) at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:125) at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707) at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387) at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171) at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
二:讀取數據超時:soTimeout
1:指的是鏈接上一個url,獲取response的返回等待時間
2:設置方法
public class TestHttpClientMain {
/** * @param args */ public static void main(String[] args) { HttpClient client = new HttpClient(); HttpMethod method = new GetMethod( "http://localhost:8080/firstTest.htm?method=test"); client.getHttpConnectionManager().getParams() .setConnectionTimeout(3000); client.getHttpConnectionManager().getParams().setSoTimeout(2000); try { int statusCode = client.executeMethod(method); System.out.println(statusCode); byte[] responseBody = null; responseBody = method.getResponseBody(); String result = new String(responseBody); System.out.println(result); } catch (HttpException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
3:測試的時候的鏈接url爲我本地開啓的一個url,http://localhost:8080/firstTest.htm?method=test
在我這個測試url裏,當訪問到這個連接時,線程sleep一段時間,來模擬返回response超時。
@RequestMapping(params = "method=test") //<——②
public String testMethod(ModelMap model) { try { Thread.sleep(3000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println("call testMethod method."); model.addAttribute("name", "test method"); return "test"; }
4:將讀取response返回超時時間設的時間比那個sleep時間短以後,運行程序給出異常:
java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method) at java.net.SocketInputStream.read(Unknown Source) at java.io.BufferedInputStream.fill(Unknown Source) at java.io.BufferedInputStream.read(Unknown Source) at org.apache.commons.httpclient.HttpParser.readRawLine(HttpParser.java:78) at org.apache.commons.httpclient.HttpParser.readLine(HttpParser.java:106) at org.apache.commons.httpclient.HttpConnection.readLine(HttpConnection.java:1116) at org.apache.commons.httpclient.HttpMethodBase.readStatusLine(HttpMethodBase.java:1973) at org.apache.commons.httpclient.HttpMethodBase.readResponse(HttpMethodBase.java:1735)
HttpClient 4 和 HttpClient 3 設置超時
鏈接超時:
httpclient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT,
60000
);
// 或者
HttpConnectionParams.setConnectionTimeout(params,
6000
);
|
讀取超時:
httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT,
60000
);
// 或者
HttpConnectionParams.setSoTimeout(params,
60000
);
|
鏈接超時:
httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(
60000
);
|
讀取超時:
httpClient.getHttpConnectionManager().getParams().setSoTimeout(
60000
);
|
ok,之後再寫httpClient這兩個超時時間必定要加上,不加就極可能悲劇的了