httpClient 超时时间设置

上周乐视网cms香港接口,数据刷新缓慢。香港运营人员一直在群里反馈tv端内容不更新。

我观察了下服务器,发现请求接口耗时很久500~6000ms。之前一般都是100ms左右。

导致很多线程一直在waiting状态,等待网络io。

所以首先找运维解决问题,原来运维人员鸟悄的给我们中港专线限速了,��汗一个。

后来运维给恢复后系统正常。

其实,看到6000ms的时候,心里咯噔一下,我记得我设置的超时时间是5000ms啊(业务需要,单条数据很大)。

原来读取超时时间没生效,只生效了连接超时时间。所以网上找了资料,介绍的很详细,试了下没问题。

尊重博主原创,特贴博客链接。copy下来只怕以后链接失效或删掉。

转自:http://blog.csdn.net/hi_kevin/article/details/32316171

HttpClient在使用中有两个超时时间,是一直接触和使用的,由于上次工作中使用httpClient造成了系统悲剧的情况,特地对它的两个超时时间进行了小小的测试,在这里记录下。

 测试版本为HttpClient——3.1



 一:连接超时:connectionTimeout

 1:指的是连接一个url的连接等待时间。

 2:设置方法为:
     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:测试的时候,将url改为一个不存在的url:“http://test.com”

 4:超时时间3000ms过后,系统报出异常。


 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:读取数据超时:soTimeout

 1:指的是连接上一个url,获取response的返回等待时间

 2:设置方法
  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:测试的时候的连接url为我本地开启的一个url,http://localhost:8080/firstTest.htm?method=test

 在我这个测试url里,当访问到这个链接时,线程sleep一段时间,来模拟返回response超时。
     @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:将读取response返回超时时间设的时间比那个sleep时间短之后,运行程序给出异常:



  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 设置超时

HttpClient 4:
连接超时:

httpclient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT,60000);
// 或者
HttpConnectionParams.setConnectionTimeout(params,6000);
读取超时:

httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT,60000);
// 或者
HttpConnectionParams.setSoTimeout(params,60000);
HttpClient 3:
连接超时:

httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(60000);
读取超时:

httpClient.getHttpConnectionManager().getParams().setSoTimeout(60000);

 ok,以后再写httpClient这两个超时时间一定要加上,不加就很可能悲剧的了

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