java - 使用常见 OpenOption 组合的最快方法

Question

是否有一种简洁、惯用的方式(可能使用 Apache Commons)来指定 OpenOption 的常见组合，如 StandardOpenOption.WRITE、StandardOpenOption.CREATE、StandardOpenOption.TRUNCATE_EXISTING

Answer 1

这些是您拥有的简单可能性。

静态导入，增加可读性:

import static java.nio.file.StandardOpenOption.CREATE_NEW;
import static java.nio.file.StandardOpenOption.WRITE;

OpenOption[] options = new OpenOption[] { WRITE, CREATE_NEW };

使用默认值:

     //no Options anyway
     Files.newBufferedReader(path, cs)

     //default: CREATE, TRUNCATE_EXISTING, and WRITE not allowed: READ
     Files.newBufferedWriter(path, cs, options)

     //default: READ not allowed: WRITE
     Files.newInputStream(path, options)

     //default: CREATE, TRUNCATE_EXISTING, and WRITE not allowed: READ
     Files.newOutputStream(path, options)

     //default: READ do whatever you want
     Files.newByteChannel(path, options)

最后可以像这样指定选项集:

     Files.newByteChannel(path, EnumSet.of(CREATE_NEW, WRITE));