Java HTTP GET响应等待超时 [英] Java HTTP GET response waits until timeout

问题描述

我应该开发一个程序来读取具有指定URL的网页，但问题是我不允许使用任何HTTP库，我只允许使用TCP。

I am supposed to develop a program that reads a web page with the specified URL, but the problem is that I am not allowed to use any HTTP libraries, I am only allowed to use TCP.

以下是读取响应消息的代码：

Below is the code that reads the response message:

private static String readMultiline (BufferedReader inStr) {
    String message="";
    String line=readLine(inStr);

    while (line != null) {
         message += line + "\r\n";
         line=readLine(inStr);
    }

    if (message.length() == 0) return null;
        return message;
}

private static String readLine (BufferedReader inStr) {
    String line = null;
    try{
         line = inStr.readLine();
    } catch (IOException ioe) {
         System.out.println("ERROR: Incoming packet could not be read properly.");
         return null;
    }
    return line;
}

问题是标题和网页内容已完全收到，但是while循环仍然等待'next'行，该行不存在。过了一会儿，超时发生，代码继续。我尝试连接的服务器不执行连接：关闭。如何检测文件的结尾？

The problem is that the header and the web page content are completely received, but the while loop still waits for the 'next' line, which does not exist. After a while, timeout occurs and the code continues. The server I am trying to connect to does not do "Connection:close". How can I detect the end of the file?

推荐答案

其他答案已删除，因此我将发布一个。您正在使用读取行信息的IO方法，其中一行被定义为由换行符终止的一组字符。但是不能保证你的TCP数据包以换行结束，所以你需要使用一个更不可知的IO读取来处理它们。

Other answers were deleted so I will post one up. You are using an IO method that read lines of information, with a line being defined as a set of characters terminated by a newline character. But there is no guarantee that your TCP packets are ending in newline, so you need to use a more agnostic IO read to process them.

看看DataInputStream，它有一个名为 readFully 的便捷方法，我认为你会觉得很有用。

Take a look at DataInputStream, it has a convenience method called readFully that I think you will find quite helpful.

这篇关于Java HTTP GET响应等待超时的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！