[转]HttpClient的超时用法小记

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 {

1. /**
2. * @param args
3. */
4. public static void main(String[] args) {
5. HttpClient client = new HttpClient();
6. HttpMethod method = new GetMethod(
7. "http://test.com");
8. client.getHttpConnectionManager().getParams()
9. .setConnectionTimeout(3000);
10. client.getHttpConnectionManager().getParams().setSoTimeout(3000);
11. try {
12. int statusCode = client.executeMethod(method);
13. System.out.println(statusCode);
14. byte[] responseBody = null;
15. responseBody = method.getResponseBody();
16. String result = new String(responseBody);
17. System.out.println(result);
18. } catch (HttpException e) {
19. // TODO Auto-generated catch block
20. e.printStackTrace();
21. } catch (IOException e) {
22. // TODO Auto-generated catch block
23. e.printStackTrace();
24. }
25. }

	/**
	 * @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

1. at org.apache.commons.httpclient.protocol.ReflectionSocketFactory.createSocket(ReflectionSocketFactory.java:155)
2. at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:125)
3. at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
4. at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
5. at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
6. at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)

	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 {

1. /**
2. * @param args
3. */
4. public static void main(String[] args) {
5. HttpClient client = new HttpClient();
6. HttpMethod method = new GetMethod(
7. "http://localhost:8080/firstTest.htm?method=test");
8. client.getHttpConnectionManager().getParams()
9. .setConnectionTimeout(3000);
10. client.getHttpConnectionManager().getParams().setSoTimeout(2000);
11. try {
12. int statusCode = client.executeMethod(method);
13. System.out.println(statusCode);
14. byte[] responseBody = null;
15. responseBody = method.getResponseBody();
16. String result = new String(responseBody);
17. System.out.println(result);
18. } catch (HttpException e) {
19. // TODO Auto-generated catch block
20. e.printStackTrace();
21. } catch (IOException e) {
22. // TODO Auto-generated catch block
23. e.printStackTrace();
24. }
25. }

	/**
	 * @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

1. public String testMethod(ModelMap model) {
2. try {
3. Thread.sleep(3000);
4. } catch (InterruptedException e) {
5. // TODO Auto-generated catch block
6. e.printStackTrace();
7. }
8. System.out.println("call testMethod method.");
9. model.addAttribute("name", "test method");
10. return "test";
11. }

    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

1. at java.net.SocketInputStream.socketRead0(Native Method)
2. at java.net.SocketInputStream.read(Unknown Source)
3. at java.io.BufferedInputStream.fill(Unknown Source)
4. at java.io.BufferedInputStream.read(Unknown Source)
5. at org.apache.commons.httpclient.HttpParser.readRawLine(HttpParser.java:78)
6. at org.apache.commons.httpclient.HttpParser.readLine(HttpParser.java:106)
7. at org.apache.commons.httpclient.HttpConnection.readLine(HttpConnection.java:1116)
8. at org.apache.commons.httpclient.HttpMethodBase.readStatusLine(HttpMethodBase.java:1973)
9. at org.apache.commons.httpclient.HttpMethodBase.readResponse(HttpMethodBase.java:1735)

	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。