HttpClient 超时 用法 

 分类： Java 技术 
2011-03-03 16:04 1763人阅读 评论(1) 收藏 举报 

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 
/**  
 * @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();   
    }   
}   
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     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 
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)  
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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 
/**  
 * @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();   
    }   
}   
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     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 
  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";   
  }  
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     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 
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)  
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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。