java.net.SocketException：连接被对等方重置：提供文件时套接字写入错误

Question

我正在尝试使用套接字实现一个HTTP服务器。如果客户端（例如浏览器）请求目录，服务器将显示可用文件列表。当客户端请求文件时就会出现问题。我得到以下错误：

java.net.SocketException: Connection reset by peer: socket write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:113)
at java.net.SocketOutputStream.write(SocketOutputStream.java:159)
at cf.charly1811.java.web.RequestHandler.writeFile(RequestHandler.java:152)
at cf.charly1811.java.web.RequestHandler.processRequest(RequestHandler.java:139)
at cf.charly1811.java.web.RequestHandler.handleRequest(RequestHandler.java:110)
at cf.charly1811.java.web.RequestHandler.run(RequestHandler.java:86)
at java.lang.Thread.run(Thread.java:745)

stacktrace显示问题来自writeFile()方法：

private void writeFile(File request) throws IOException 
{
    InputStream byteReader = new BufferedInputStream(new FileInputStream(request));
    byte[] buffer = new byte[1024];
    int bytesRead;
    while ((bytesRead = byteReader.read(buffer)) != -1) 
    {
        outputStream.write(buffer, 0, bytesRead);
    }
    byteReader.close();
}

但我想不出有什么问题。你能帮帮我吗？

编辑

谢谢大家的回答。在我读了你的答案后，我明白了问题是插座出现错误的时候。这是我的错误代码：

// Method to process a single request
handleRequest() throw IOException
{
    // process here
    // if the client request a file
    writeFile();
    // close socket when the request is processed
}

// The method is called
public run()
{
    try{
        // If an error occurs the try/catch won't be called because it is implemented outside the loop. So when an IOException occurs, the loop just stop and exit the program
        while(true)
        {
            handleRequest();
        }
    }
    catch(IOException e) {
        // Handle exception here
    }
}

我的新代码是这样的：

// Method to process a single request
handleRequest()
{
   try {
        // process here
        // if the client request a file
        writeFile();
        // close socket when the request is processed
    }
    // If this exception occurs the catch() method will be called
    catch(IOException e)
    {
        // handle exception here
    }
}

// The method is called
public run()
{
    while(true)
        {
            handleRequest();
        }
    }
}

Answer 1

TCP套接字可能正在“关闭”，而您的代码尚未收到通知。

这里是一个生命周期的动画。http://tcp.cs.st-andrews.ac.uk/index.shtml？page=connection_lifecycle

基本上，连接是由客户端关闭的。您已经有抛出IOException和SocketException扩展IOException。一切正常。您只需要正确处理IOException，因为它是API的正常部分。

编辑:rst数据包发生在不存在或已关闭的套接字上。与您的应用程序没有区别。根据实现的不同，重置状态可能会保持不变，而关闭将永远不会正式发生。