用java怎么创建一个文件并向该文件写文本内容

最佳答案:

创建一个文本文件（注意：如果该文件存在，则会覆盖该文件）

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

创建一个二进制文件（同样会覆盖这文件）

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

Java 7+ 用户可以用File类来写文件 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, Charset.forName("UTF-8"));//Files.write(file, lines, Charset.forName("UTF-8"), StandardOpenOption.APPEND);

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);

其他的答案（1）:

在Java 7+中

try (Writer writer = new BufferedWriter(new OutputStreamWriter(              new FileOutputStream("filename.txt"), "utf-8"))) {   writer.write("something");}

还有一些实用的方法如下：

• FileUtils.writeStringtoFile(..) 来自于 commons-io 包
• Files.write(..) 来自于 guava

Note also that you can use a FileWriter, but it uses the default encoding, which is often a bad idea - it's best to specify the encoding explicitly. 还要注意可以使用 FileWriter，但是它使用的是默认编码，这不是很好的方法，最好是明确指定编码

下面是来自于prior-to-java-7的原始方法

Writer writer = null;try {    writer = new BufferedWriter(new OutputStreamWriter(          new FileOutputStream("filename.txt"), "utf-8"));    writer.write("Something");} catch (IOException ex) {  // report} finally {   try {writer.close();} catch (Exception ex) {/*ignore*/}}

可以看Reading, Writing, and Creating Files(包含NIO2)

其他答案（2）：

public class Program {    public static void main(String[] args) {        String text = "Hello world";        BufferedWriter output = null;        try {            File file = new File("example.txt");            output = new BufferedWriter(new FileWriter(file));            output.write(text);        } catch ( IOException e ) {            e.printStackTrace();        } finally {            if ( output != null ) output.close();        }    }}

其他答案（3）：

如果已经有想要写到文件中的内容，java.nio.file.Files 作为 Java 7 附加部分的native I/O，提供了简单高效的方法来实现你的目标

基本上创建文件，写文件只需要一行，而且是只需一个方法调用！ 下面的例子创建并且写了6个不同的文件来展示是怎么使用的

Charset utf8 = StandardCharsets.UTF_8;List<String> lines = Arrays.asList("1st line", "2nd line");byte[] data = {1, 2, 3, 4, 5};try {    Files.write(Paths.get("file1.bin"), data);    Files.write(Paths.get("file2.bin"), data,            StandardOpenOption.CREATE, StandardOpenOption.APPEND);    Files.write(Paths.get("file3.txt"), "content".getBytes());    Files.write(Paths.get("file4.txt"), "content".getBytes(utf8));    Files.write(Paths.get("file5.txt"), lines, utf8);    Files.write(Paths.get("file6.txt"), lines, utf8,            StandardOpenOption.CREATE, StandardOpenOption.APPEND);} catch (IOException e) {    e.printStackTrace();}

其他答案（4）：

下面是一个小程序来创建和写文件。该版本的代码比较长，但是可以容易理解

import java.io.BufferedWriter;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStreamWriter;import java.io.Writer;public class writer {    public void writing() {        try {            //Whatever the file path is.            File statText = new File("E:/Java/Reference/bin/images/statsTest.txt");            FileOutputStream is = new FileOutputStream(statText);            OutputStreamWriter osw = new OutputStreamWriter(is);                Writer w = new BufferedWriter(osw);            w.write("POTATO!!!");            w.close();        } catch (IOException e) {            System.err.println("Problem writing to the file statsTest.txt");        }    }    public static void main(String[]args) {        writer write = new writer();        write.writing();    }}

原文地址：https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-to-create-a-file-and-write-to-a-file-in-java.md