"SocketException:服务器中的文件意外结束"从servlet，但不是从独立应用程序 [英] "SocketException: Unexpected end of file from server" from servlet but not from standalone application

问题描述

我想从我的servlet中调用一个servlet.我可以从一个独立的应用程序中调用远程servlet，但不能从我的servlet中调用它(它在Glassfish上).我使用完全相同的代码进行通话(我在最后一行代码中得到了错误):

I would like to call a servlet from my servlet. I can call the remote servlet from a standalone application but I cannot call it from my servlet (it is on Glassfish). I use exactly the same code for the call (I get the error at the last code line):

URL serverAddress = new URL(endpoint);
//Set up the initial connection
HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
connection.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setReadTimeout(timeOut);
connection.setRequestProperty("Content-Type", "text/xml; charset=ISO-8859-1");
connection.connect();
OutputStreamWriter wr = new OutputStreamWriter(connection.getOutputStream());
wr.write(requestBody);
wr.flush();
BufferedReader rd = new BufferedReader(new InputStreamReader(connection.getInputStream()));

可疑的是，此代码无法读取远程servlet的响应，因此该servlet可能根本不响应.但是，当我从独立应用程序调用它时为什么会回复?我真的不明白 我有这个例外:

It is suspicious that this code can't read the response of the remote servlet so probably the servlet doesn't reply at all. However why does it reply when I call it from standlone app? I really don't understand... I got this exception:

java.net.SocketException: Unexpected end of file from server
    at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:769)
    at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:632)
    at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:766)
    at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:632)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1049)

有人有什么主意吗? servlet是否有一些限制，使其不能使用HttpURLConnection?谢谢！

Has anyone any idea? Is it possible that there are restricitions for servlets not to use the HttpURLConnection? Thanks!

推荐答案

由于未设置Content-Length标头，因此可能会发生这种情况.并且因为未发送POST结束请求主体.服务器结束等待，直到超时为止.

This might be happening because the Content-Length header is not set. And because the End of POST request body is not sent. The server is ending up waiting till timeout for the end of stream.

您应该尝试以下两项操作使其正常工作:

You should try out these two things to get it working:

• 在执行connect()
之前，将内容长度标头设置为请求正文的大小
• 尝试关闭发送POST请求结束的connection.getOutputStream().close().

• Set the content length header with the request body size before doing connect()
• Try closing the connection.getOutputStream().close() which send the end of POST request.

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