from：http://blog.163.com/xing_mu_1/blog/static/6614290201032084947978/

HttpClient在使用中有兩個超時時間，是一直接觸和使用的，由于上次工作中使用httpClient造成了系統悲劇的情況，特地對它的兩個 超時時間進行了小小的測試，在這里記錄下。??

?? 測試版本為HttpClient——3.1

????? 一：連接超時：connectionTimeout

????? 1：指的是連接一個url的連接等待時間。

????? 2：設置方法為：

?????? 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：測試的時候，將url改為一個不存在的url：“http://test.com”

????? 4：超時時間3000ms過后，系統報出異常。

?????? 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：讀取數據超時：soTimeout

????? 1：指的是連接上一個url，獲取response的返回等待時間

????? 2：設置方法

?? ?? 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：測試的時候的連接url為我本地開啟的一個url，http://localhost:8080 /firstTest.htm?method=test

????? 在我這個測試url里，當訪問到這個鏈接時，線程sleep一段時間，來模擬返回response超時。

?????? @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：將讀取response返回超時時間設的時間比那個sleep時間短之后，運行程序給出異常：

??????? 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，以后再寫httpClient這兩個超時時間一定要加上，不加就很可能悲劇的了。

轉載于:https://blog.51cto.com/winters1224/799019

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