HttpClient的超时用法小记

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)

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。