Question

我有下面的代码当我没有关闭ServerSocket语句时，我得到一个错误，说它是资源泄漏但是当我添加close语句Eclipse告诉我代码无法访问时，如何更改代码以关闭while语句之外的套接字？

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();
    }

Answer 1

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();
    }

或使用像这样的try-with-resources构造

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

代码无法访问的原因是因为while循环未终止。另请注意，serverSocket在代码中的那一点不能为null，因为除非抛出异常，否则构造函数必须始终生成新实例。

文件传输Java后关闭ServerSocket时出错

1 个答案: