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  • [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 {

    Java代码 复制代码 收藏代码
    1. /**  
    2.  * @param args  
    3.  */  
    4. public static void main(String[] args) {   
    5.     HttpClient client = new HttpClient();   
    6.   
    7.     HttpMethod method = new GetMethod(   
    8.             "http://test.com");   
    9.     client.getHttpConnectionManager().getParams()   
    10.             .setConnectionTimeout(3000);   
    11.     client.getHttpConnectionManager().getParams().setSoTimeout(3000);   
    12.     try {   
    13.         int statusCode = client.executeMethod(method);   
    14.         System.out.println(statusCode);   
    15.   
    16.         byte[] responseBody = null;   
    17.   
    18.         responseBody = method.getResponseBody();   
    19.   
    20.         String result = new String(responseBody);   
    21.   
    22.         System.out.println(result);   
    23.   
    24.     } catch (HttpException e) {   
    25.         // TODO Auto-generated catch block   
    26.         e.printStackTrace();   
    27.     } catch (IOException e) {   
    28.         // TODO Auto-generated catch block   
    29.         e.printStackTrace();   
    30.     }   
    31. }   
    	/**
	 * @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

    Java代码 复制代码 收藏代码
    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 {

    Java代码 复制代码 收藏代码
    1. /**  
    2.  * @param args  
    3.  */  
    4. public static void main(String[] args) {   
    5.     HttpClient client = new HttpClient();   
    6.   
    7.     HttpMethod method = new GetMethod(   
    8.             "http://localhost:8080/firstTest.htm?method=test");   
    9.     client.getHttpConnectionManager().getParams()   
    10.             .setConnectionTimeout(3000);   
    11.     client.getHttpConnectionManager().getParams().setSoTimeout(2000);   
    12.     try {   
    13.         int statusCode = client.executeMethod(method);   
    14.         System.out.println(statusCode);   
    15.   
    16.         byte[] responseBody = null;   
    17.   
    18.         responseBody = method.getResponseBody();   
    19.   
    20.         String result = new String(responseBody);   
    21.   
    22.         System.out.println(result);   
    23.   
    24.     } catch (HttpException e) {   
    25.         // TODO Auto-generated catch block   
    26.         e.printStackTrace();   
    27.     } catch (IOException e) {   
    28.         // TODO Auto-generated catch block   
    29.         e.printStackTrace();   
    30.     }   
    31. }   
    	/**
	 * @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

    Java代码 复制代码 收藏代码
    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

    Java代码 复制代码 收藏代码
    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。
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  • 原文地址：https://www.cnblogs.com/yanff/p/HttpClient.html
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