FileInputStream与FileOutputStream 复制文件例子代码

    try {
        File sourceFile = new File("C:\Users\prize\Desktop\Demo1\盗墓笔记7.txt");//创建源文件
        InputStream inputStream = new FileInputStream(sourceFile);//创建输入文件流
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream)); //创建文本行缓存输入流 导入  缓存输入流
        File targetFile = new File("F:\手机T卡资料\直接复制T卡\EBOOK\复制的书.txt"); //创建复制的目标文件
        if (targetFile.exists()) { //判断文件是否存在
            targetFile.delete(); //删除文件
            targetFile.createNewFile();         //创建文件
        }else {
            targetFile.createNewFile();                
        }
    
        OutputStream out = new FileOutputStream(targetFile); //创建输出文件流
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(out)); //创建文本缓存输出流 导入 缓存输出流
        String aString = null; //给一行的内容准备的String
        int i = 0;
        while ((aString = reader.readLine()) != null && i<20) { //读取一行，并且赋值给aString，然后在判断不是空值
            //i++;  //此处是为了输出指定数量行数写的 循环自增，
            writer.write("
"+aString); //将内容添加到输出流中
            //System.out.println(aString);
        
            
            
        }
        
        writer.flush(); //刷新输出流
        writer.close(); //关闭流 ，注意流的关闭顺序
        out.close();
        reader.close();
        inputStream.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

流文件

                int len = 0;
                byte[] bytes = new byte[2048];
                while ((len = fileInputStream.read(bytes)) != -1) {
                    fileOutputStream.write(bytes, 0, len);
                    fileOutputStream.flush();
                }
                fileInputStream.close();
                fileOutputStream.close();

批量处理文件：

 public void fileList() {
        File inFile = new File("C:\Users\lenovo\Desktop\copy\color");
        File [] files = inFile.listFiles();
        for (int i = 0; i < files.length; i++) {
            files[i].delete();
            System.out.println(files[i].toString());
            
        }