FileUtils.writeByteArrayToFile方法

import java.io.*;
import org.apache.commons.io.FileUtils;

public class Test {
    public static void main(String[] args){
        File f = new File("C:\\Users\\Administrator\\Desktop\\a.txt");
        try {
            FileUtils.writeByteArrayToFile(f, new String("HelloWorld").getBytes(), true);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}