java - 关闭 BufferedReader()？

Question

我编写了一段代码，可以读取网页并将其传输到 .txt 文件中。问题是输出文件(something.txt)被锁定(如果有帮助的话我使用OS X)。我发现未关闭的 BufferedReader() 可能有问题，但它似乎已关闭。谢谢。

PrintStream ps = new PrintStream(new File("/Users/MyName/Desktop/something.txt"));
URL myUrl = new URL("webPage");
BufferedReader in = new BufferedReader(new InputStreamReader(myUrl.openStream()));
String inputLine;
while ((inputLine = in.readLine()) != null) {
    ps.println(inputLine);
    System.out.println(inputLine);
}
in.close();
ps.close();

Answer 1

如果您使用的是 Java 7，那么最好的方法是 try-with-resources，它保证 in 和 ps 都将关闭

    try (PrintStream ps = new PrintStream(new File("/Users/MyName/Desktop/something.txt"));
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    new URL("webPage").openStream()))) {
        String inputLine;
        while ((inputLine = in.readLine()) != null) {
            ps.println(inputLine);
            System.out.println(inputLine);
        }
    }