java - 如何创建文件并用Java写入文件？(How do I create a file and write to it in Java?)

Question

用Java创建和写入（文本）文件的最简单方法是什么？

  ask by Drew Johnson translate from so

Answer 1

Note that each of the code samples below may throw IOException .

(请注意，下面的每个代码示例都可能抛出IOException 。)

Try/catch/finally blocks have been omitted for brevity.

(为简便起见，省略了try / catch / finally块。)

See this tutorial for information about exception handling.

(有关异常处理的信息，请参见本教程 。)

Note that each of the code samples below will overwrite the file if it already exists

(请注意，下面的每个代码示例都将覆盖该文件（如果已存在）)

Creating a text file:

(创建一个文本文件：)

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

Creating a binary file:

(创建一个二进制文件：)

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

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

(Java 7+用户可以使用Files类来写入文件：)

Creating a text file:

(创建一个文本文件：)

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);

Creating a binary file:

(创建一个二进制文件：)

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