August 14, 2022

How to write data to a temporary file in Java

The temporary file is just a regular file created on a predefined directory. In Java, we can use the NIO Files.write() to write data to a temporary file. In Java, there are many ways to write data or text to a temporary file; it works like writing to a regular file. You can choose BufferedWriter, FileWriter etc, but in most cases, the NIO java.nio.Files should be enough to write or append data to a file.

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How to append text to a file in Java

This article shows how to use the following Java APIs to append text to the end of a file. (1) Files.write – Append a single line to a file, Java 7. (2) Files.write – Append multiple lines to a file, Java 7, Java 8. (3) Files.writeString – Java 11. (4) FileWriter, (5) FileOutputStreamFileUtils – Apache Commons IO. In Java, for NIO APIs like Files.write, we can use StandardOpenOption.APPEND to enable the append mode. For classic IO APIs like FileWriter or FileOutputStream, we can pass a true to the constructor’s second argument to enable the append mode.

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Java create and write to a file

In Java, we can use Files.write to create and write to a file. The Files.write also accepts an Iterable interface; it means this API can write a List to a file. Before Java 7, for writing bytes (image) to a file, we use FileOutputStream; for writing characters (text) to a file, we use FileWriter, and usually wrapped by a BufferedWriter to gain performance. In Java 7, there is a new NIO class named java.nio.file.Files, and we can use Files.write() to write both bytes and characters. In Java 8, we can use Files.newBufferedWriter(path) to create a BufferedWriter. In Java 11, there is a new Files.writeString API to write string directly to a file.

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