​FileOutputStream（文件输出流）

用于文件下载

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
public class FileOutPutStreamStudy {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
//        firstWriteMethod();
        secondWriteMethod();
    }
    /**
     * 一批一批的写
     */
    private static void secondWriteMethod() {
        // TODO Auto-generated method stub
        String path = "D:\\movie\\japan\\dj\\xzm.txt";
        File file = new File(path);
        //定义输出流
        FileOutputStream fos = null;
        try {
            //存不存在
            if(!file.exists()) {
                file.createNewFile();
            }
            //实例化输出流
            fos = new FileOutputStream(file);
            String str = "你老了，可以退休，因为没人看了！！！！！";
            byte[] data = str.getBytes("UTF-8");
            //向文件中一次型写入内容
            fos.write(data);
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }finally {
            try {
                fos.close();//关闭流
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    /**
     * 一个字节一个字节的写
     */
    private static void firstWriteMethod() {
        // TODO Auto-generated method stub
        String path = "D:\\movie\\japan\\dj\\bdy.txt";
        File file = new File(path);
        //定义输出流
        FileOutputStream fos = null;
        try {
            //存不存在
            if(!file.exists()) {
                file.createNewFile();
            }
            //实例化输出流
            fos = new FileOutputStream(file);
            String str = "这是今年最好的一部电影！！！";
            byte[] data = str.getBytes("UTF-8");
            for (byte c : data) {
                //操作流
                fos.write(c);
            }
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }finally {
            try {
                fos.close();//关闭流
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}