Groovy File.getText()-我必须关闭一些东西吗

Question

如果我在groovy 中使用File.getText()方法

newFile().text或newFile().getText()

我必须执行一些闭包语句来关闭使用过的文件读取器吗？还是该方法会自己完成？

Answer 1

它将自己完成。

调用new File( 'a.txt' ).text将调用ResourceGroovyMethods.getText( File )

public static String getText(File file, String charset) throws IOException {
    return IOGroovyMethods.getText(newReader(file, charset));
}

正如你所看到的，它调用IOGroovyMethods.getText( BufferedReader ):

public static String getText(BufferedReader reader) throws IOException {
    StringBuilder answer = new StringBuilder();
    // reading the content of the file within a char buffer
    // allow to keep the correct line endings
    char[] charBuffer = new char[8192];
    int nbCharRead /* = 0*/;
    try {
        while ((nbCharRead = reader.read(charBuffer)) != -1) {
            // appends buffer
            answer.append(charBuffer, 0, nbCharRead);
        }
        Reader temp = reader;
        reader = null;
        temp.close();
    } finally {
        closeWithWarning(reader);
    }
    return answer.toString();
}

正如您所看到的，完成时关闭阅读器