我如何创建一个文件并在Java中写入？ [英] How do I create a file and write to it in Java?

问题描述

在Java中创建和写入文本的最简单的方法是什么？

下面的每个代码示例都会抛出 IOExcepions 。 Try / catch / finally块为简洁起见已被省略。有关异常处理的信息，请参阅本教程。

创建一个文本文件（注意，如果文件已存在，将覆盖该文件）：

  PrintWriter writer = new PrintWriter（the-file-name.txt，UTF-8）; 
 writer.println（第一行）; 
 writer.println（第二行）; 
 writer.close（）; 
  

创建二进制文件（也将覆盖文件）：

  byte data [] = ... 
 FileOutputStream out = new FileOutputStream（the-file-name）; 
 out.write（data）; 
 out.close（）;用户可以使用 
 
 
 
 $ b   //docs.oracle.com/javase/7/docs/api/index.html?java/nio/file/Files.htmlrel =noreferrer>  Files  类写入文件：
 
 
创建一个文本文件：
 列表与LT;字符串> lines = Arrays.asList（第一行，第二行）; 
 Path file = Paths.get（the-file-name.txt）; 
 Files.write（文件，行，Charset.forName（UTF-8））; 
 //Files.write（文件，行，Charset.forName（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（文件，数据，StandardOpenOption.APPEND）; 
  
 
What's the simplest way to create and write to a (text) file in Java?
解决方案
Note that each of the code samples below throw IOExcepions. Try/catch/finally blocks have been omitted for brevity. See this tutorial for information about exception handling.


Creating a text file (note that this will overwrite the file if it already exists):
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 (will also overwrite the file):
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:

Creating a text file:
List<String> lines = Arrays.asList("The first line", "The second line");
Path file = Paths.get("the-file-name.txt");
Files.write(file, lines, Charset.forName("UTF-8"));
//Files.write(file, lines, Charset.forName("UTF-8"), StandardOpenOption.APPEND);
Creating a binary file:
byte data[] = ...
Path file = Paths.get("the-file-name");
Files.write(file, data);
//Files.write(file, data, StandardOpenOption.APPEND);


                        
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