我能找到的最简单的方法是：

Path sampleOutputPath = Paths.get("/tmp/testfile")
try (BufferedWriter writer = Files.newBufferedWriter(sampleOutputPath)) {
    writer.write("Hello, world!");
}

它可能只适用于1.7+。

只有一行！路径和行是字符串

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

Files.write(Paths.get(path), lines.getBytes());

这里有一个创建或覆盖文件的小示例程序。这是一个长版本，因此可以更容易理解。

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();
    }
}

Use:

try (Writer writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("myFile.txt"), StandardCharsets.UTF_8))) {
    writer.write("text to write");
} 
catch (IOException ex) {
    // Handle me
}  

使用try（）将自动关闭流。此版本短、快（缓冲），并支持选择编码。

这个特性是在Java7中引入的。

创建示例文件：

try {
    File file = new File ("c:/new-file.txt");
    if(file.createNewFile()) {
        System.out.println("Successful created!");
    }
    else {
        System.out.println("Failed to create!");
    }
}
catch (IOException e) {
    e.printStackTrace();
}

以下是编写文件的代码，也在退出帮助内容网页时删除：

public String writeHelpContent(String filePath, String helpPageContent) throws IOException{
        logger.info("HowToUseRiskOfficeHelpService - writeHelpContent start");
        File file = new File(filePath);
        try(FileWriter fw = new FileWriter(file);){
            file.deleteOnExit();
            if(file.createNewFile()) {
                logger.info("HowToUseRiskOfficeHelpService - file created successfully");
            }else {
                logger.info("HowToUseRiskOfficeHelpService - file already exists");
            }
            fw.write(helpPageContent); 
            fw.flush();
        }

        return "Sucessfully write into help page file";
    }