有时HttpURLConnection.getInputStream的执行速度太慢 [英] Sometimes HttpURLConnection.getInputStream executes too slowly

问题描述

我们有下一个代码。

有时我们应该在最后一行等待10-20-40秒。

有什么问题？

We have next code.
Sometimes we should wait 10-20-40 seconds on the last line.
What can be the problem?

Java 1.4

URL url = ...;
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.connect();
OutputStream out = conn.getOutputStream();
ObjectOutputStream outStream = new ObjectOutputStream(out);
try
{
   outStream.writeObject(objArray);
}
finally
{
   outStream.close();
}

InputStream input = conn.getInputStream();

更新：

下一代码解决问题IN ECLIPSE。< br>
但它仍然无法通过Java WebStart工作：（

HttpURLConnection conn = (HttpURLConnection) url.openConnection();  
conn.setDoInput(true);  
conn.setDoOutput(true);  
conn.setUseCaches(false);  
System.setProperty("http.keepAlive", "false");  //<---------------
conn.connect();  

但为什么？

再次更新！

错误已修复！:)


我们使用的连接不是在一个类中而是在两个类中。

第二类中有以下行：

UPDATED one more time!
Bug was fixed! :)
We worked with connections not in one class but in two.
And there is following line in the second class:

URL url = ...  
HttpURLConnection conn = (HttpURLConnection) url.openConnection();  
conn.setRequestProperty("Content-Length", "1000");  //<------------
conn.connect();  

注意：
setRequestProperty（Content-Length， 1000）是问题的根本原因。

Note: setRequestProperty("Content-Length", "1000") is root cause of the problem.

推荐答案

'我们遇到了类似的问题由旧Java中的buggy keep-alive引起的。在连接之前添加它以查看它是否有帮助，

'We had a similar issue which is caused by buggy keep-alive in old Java. Add this before connect to see if it helps,

conn.setRequestProperty("Connection", "close");

或

System.setProperty("http.keepAlive", "false");

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