如何创建文件并写入文件? [英] How do I create a file and write to it?

问题描述

创建和写入(文本)文件的最简单方法是什么在 Java 中?

推荐答案

请注意，下面的每个代码示例都可能抛出 IOException.为简洁起见，已省略 Try/catch/finally 块.有关异常处理的信息，请参阅本教程.

Note that each of the code samples below may throw IOException. Try/catch/finally blocks have been omitted for brevity. See this tutorial for information about exception handling.

请注意，如果文件已经存在，下面的每个代码示例都会覆盖该文件

创建文本文件:

PrintWriter writer = new PrintWriter("the-file-name.txt", "UTF-8");
writer.println("The first line");
writer.println("The second line");
writer.close();

创建二进制文件:

byte data[] = ...
FileOutputStream out = new FileOutputStream("the-file-name");
out.write(data);
out.close();

Java 7+ 用户可以使用 Files 类写入文件:

Java 7+ users can use the Files class to write to files:

创建文本文件:

List<String> lines = Arrays.asList("The first line", "The second line");
Path file = Paths.get("the-file-name.txt");
Files.write(file, lines, StandardCharsets.UTF_8);
//Files.write(file, lines, StandardCharsets.UTF_8, StandardOpenOption.APPEND);

创建二进制文件:

byte data[] = ...
Path file = Paths.get("the-file-name");
Files.write(file, data);
//Files.write(file, data, StandardOpenOption.APPEND);

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