检测Java中HTTP请求的结束 [英] Detect the end of an HTTP Request in Java

问题描述

我试图设计一个Java代理程序，但是我的java程序在读取整个HTTP请求时遇到了问题。

Im trying to design a Java proxy program, but my java program has issues reading an entire HTTP request.

我使用了 InputStream object isObj 尝试获取数据：

I used the InputStream object isObj to try to obtain data:

isObj.read(byteBuff)

但这通常会导致数据无法完全读取。即，在POST请求的情况下，有时，只读取HTTP标头，而不读取POST数据。所以，我尝试使用下面的内容来完全读取数据。

But this often results in the data not getting read completely. i.e in case of a POST request, sometimes, the HTTP headers alone are read while the POST data is not read. So, I tried to use the below to read the data fully.

ByteArrayOutputStream baos=new ByteArrayOutputStream();
while((len=isObj.read(tempBuff))>0){
    baos.write(tempBuff,0,len);
}
byte[] byteBuff=baos.toByteArray();

但是，此方法也在 isObj.read（tempBuff）<阻止 function。

However, this method also blocked at the isObj.read(tempBuff) function.

尝试使用DataInputStream的另一种方法，如：

Tried another method using the DataInputStream like:

DataInputStream dis=new DataInputStream(isObj);
byte[] byteBuff=new byte[8196];
dis.readFully(byteBuff);

这也被阻止在 readFully（）函数。

我通读并遇到了这个

检测HTTP请求正文的结束

表示原因是我们无法确定何时数据将被解决（除非是为了响应）。它要求我们使用Content-Length标头来检测最终长度。这绝对是读取HTTP请求的唯一方法吗？或者是否有其他库自动执行此操作？

which indicates that the reason is that there is no way we can identify when the data will get over(unless it is for a response). And it asks us to use the Content-Length header to detect the final length. Is this absolutely the only way to read HTTP Requests? Or is there any other library which does this automatically?

推荐答案

您可以使用 Apache的HttpComponents 。 HttpCore库提供 DefaultHttpRequestParser 返回 HttpRequest 实例，包含从请求中获取标题和字段的方法。

You can use Apache's HttpComponents for this. The HttpCore library offers a DefaultHttpRequestParser which returns a HttpRequest instance with methods to get headers and fields from the request.

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