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

HttpClient在使用中有兩個超時時間，是一直接觸和使用的，由於上次工作中使用httpClient造成了系統悲劇的情況，特地對它的兩個超時時間進行了小小的測試，在這裏記錄下。

測試版本為HttpClient——3.1

一：連接超時：connectionTimeout

1：指的是連接一個url的連接等待時間。

2：設置方法為：

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改為一個不存在的url：“http://test.com”

4：超時時間3000ms過後，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：指的是連接上一個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：測試的時候的連接url為我本地開啟的一個url，http://localhost:8080/firstTest.htm?method=test

在我這個測試url裏，當訪問到這個鏈接時，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時間短之後，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：

連接超時：

讀取超時：

HttpClient 3：

連接超時：

讀取超時：

HttpClient 4：

連接超時：

讀取超時：

HttpClient 3：

連接超時：

讀取超時：

ok，以後再寫httpClient這兩個超時時間一定要加上，不加就很可能悲劇的了

httpClient 超時時間設置（轉）