from：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().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 blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.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);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 blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.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 blocke.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。