你可以这样做：

import java.io.*;
import java.util.*;

class WriteText
{
    public static void main(String[] args)
    {   
        try {
            String text = "Your sample content to save in a text file.";
            BufferedWriter out = new BufferedWriter(new FileWriter("sample.txt"));
            out.write(text);
            out.close();
        }
        catch (IOException e)
        {
            System.out.println("Exception ");       
        }

        return ;
    }
};

如果您需要基于一个字符串创建文本文件：

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;

public class StringWriteSample {
    public static void main(String[] args) {
        String text = "This is text to be saved in file";

        try {
            Files.write(Paths.get("my-file.txt"), text.getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

看看Java文件API

快速示例：

try (PrintStream out = new PrintStream(new FileOutputStream("filename.txt"))) {
    out.print(text);
}

使用Java 7：

public static void writeToFile(String text, String targetFilePath) throws IOException
{
    Path targetPath = Paths.get(targetFilePath);
    byte[] bytes = text.getBytes(StandardCharsets.UTF_8);
    Files.write(targetPath, bytes, StandardOpenOption.CREATE);
}

使用Apache Commons IO中的FileUtils.writeStringToFile（）。无需重新发明这个轮子。

只是在我的项目中做了类似的事情。使用FileWriter将简化部分工作。在这里你可以找到很好的教程。

BufferedWriter writer = null;
try
{
    writer = new BufferedWriter( new FileWriter( yourfilename));
    writer.write( yourstring);

}
catch ( IOException e)
{
}
finally
{
    try
    {
        if ( writer != null)
        writer.close( );
    }
    catch ( IOException e)
    {
    }
}