HttpClient的超时用法小记
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原文地址:http://blog.163.com/xing_mu_1/blog/static/6614290201032084947978/
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。
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