文件传输后关闭 ServerSocket 时出错 Java

Error closing ServerSocket after file transfer Java

我有下面的代码 当我没有关闭 ServerSocket 语句时,我收到一条错误消息,说这是资源泄漏,但是当我添加关闭语句时,Eclipse 告诉我代码无法访问,我该如何更改代码在 while 语句之外关闭套接字?

serverSocket = new ServerSocket(ServerPort);
    File incomingFile = new File("testfile.txt");

    while (true) {
        System.out.println("Waiting For File");
        Socket incomingSocket = serverSocket.accept();
        byte[] mybytearray = new byte[(int) incomingFile.length()];
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(incomingFile));
        bis.read(mybytearray, 0, mybytearray.length);
        bis.close();
        OutputStream os = incomingSocket.getOutputStream();
        os.write(mybytearray, 0, mybytearray.length);
        os.flush();
        if (incomingSocket != null) {
            incomingSocket.close();
        }

    }
    if(serverSocket != null) {
        serverSocket.close();
    }

防止资源泄漏的正确方法是使用try..finally

    serverSocket = new ServerSocket(serverPort);
    try {
        File incomingFile = new File("testfile.txt");
        while (true) {
            // your code
        }
    } finally {
        serverSocket.close();
    }

或像这样使用 try-with-resources 结构

    try (serverSocket = new ServerSocket(serverPort)) {
        File incomingFile = new File("testfile.txt");
        while (true) {
            // your code
        }
    }

无法访问代码的原因是您的 while 循环未终止。另请注意,serverSocket 在代码中的那个位置不能为 null,因为除非抛出异常,否则构造函数必须始终生成一个新实例。