Java 写文件的几种方式

上篇中分享了使用Java实现文件的读，本篇主要从写文件的角度做个简单总结。

代码展示：

package learnjava.fileIO;

import java.io.*;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;

public class WriteFile {
    static String content = "This is the file content.";

    public static void main(String[] args) {
        String path1 = new String("D:\software\intelli D\myDemo\src\learnjava\fileIO\file_wr_stream");
        String path2 = new String("D:\software\intelli D\myDemo\src\learnjava\fileIO\file_wr_writer");
        String path3 = new String("D:\software\intelli D\myDemo\src\learnjava\fileIO\file_wr_buf_stream");
        String path4 = new String("D:\software\intelli D\myDemo\src\learnjava\fileIO\file_wr_buf_writer");
        String path5 = new String("D:\software\intelli D\myDemo\src\learnjava\fileIO\file_wr_print_writer");
        String path6 = new String("D:\software\intelli D\myDemo\src\learnjava\fileIO\file_wr_Files_writer");
        fileOutputStream(path1);
        fileWriter(path2);
        fileBufferedOutputStream(path3);
        fileBufferedWriter(path4);
        filePrinterWriter(path5);
        fileFilesWrite(path6);
    }
    // byte write, suit for binary file
    public static void fileOutputStream(String dstPath) {
        System.out.println("Write file by stream...");
        try {
            FileOutputStream fos = new FileOutputStream(dstPath);

            byte[] bytes = content.getBytes(StandardCharsets.UTF_8);
            fos.write(bytes);

            fos.close();

            System.out.println("Write file successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // buffer stream write in byte stream, with buffer
    public static void fileBufferedOutputStream(String dstPath) {
        System.out.println("Write file by BufferedOutputStream...");

        try {
            FileOutputStream fos = new FileOutputStream(dstPath);
            BufferedOutputStream bos = new BufferedOutputStream(fos);

            bos.write(content.getBytes(StandardCharsets.UTF_8));

            bos.close();
            fos.close();
            System.out.println("Write file successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // char write, suit for text file
    public static void fileWriter(String dstPath) {
        System.out.println("Write file by FileWriter...");
        try {
            FileWriter fw = new FileWriter(dstPath);

            fw.write(content);

            fw.close();

            System.out.println("Write file successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // buffer writer
    public static void fileBufferedWriter(String dstPath) {
        System.out.println("Write file by BufferedWriter...");

        try {
            FileWriter fw = new FileWriter(dstPath);
            BufferedWriter bw = new BufferedWriter(fw);

            bw.write(content);

            bw.close();
            fw.close();

            System.out.println("Write file successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // printer writer
    public static void filePrinterWriter(String dstPath) {
        System.out.println("Write file by PrinterWriter...");

        try {
            FileWriter fw = new FileWriter(dstPath);
            PrintWriter pw = new PrintWriter(fw);

            pw.write(content);

            pw.close();
            fw.close();

            System.out.println("Write file successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // Files writer
    public static void fileFilesWrite(String dstPath) {
        System.out.println("Write file by FilesWrite...");
        try {
            Files.write(Paths.get(dstPath), content.getBytes(StandardCharsets.UTF_8));
            System.out.println("Write file successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

写文件也比较简单，上面我们实现了6种方式实现写文件，根据使用场景可以做相应选择，比如文件很大，就可以选择带缓冲的写文件，小文件的写入不考虑性能问题，就尽量简单编码。

参考：

• 文件写入的6种方法，这种方法性能最好