InputStream、OutputStream应用--文件复制

文件复制功能实现： 指定一个文件，将其复制到指定路径下

public class copytxt190319 {
    public static void main(String[] args) throws IOException {
        //打开读写流，进行读写，关闭读写流
        String path = "C:\\Users\\a\\Desktop\\L\\inputtest.txt";
        String newpath = "C:\\Users\\a\\Desktop\\L\\i.txt";
        copyFile(path,newpath);
    }
    public static void copyFile(String srcPath,String destPath) throws IOException {
        //打开读写流
        FileInputStream is = new FileInputStream(srcPath);
        FileOutputStream os = new FileOutputStream(destPath);

        //进行读写
        int byt= 0;
        byte[] bytes = new byte[100];
        is.read();
        //读法之一
        /*while ((byt = is.read()) != -1) {
            os.write(byt);
        }*/
        //读法之二
        while ((byt = is.read(bytes)) != -1){
            os.write(bytes, 0, byt);
        }

        //错误实例  ==>数据读取不完善
        while (is.read() != -1) {
            os.write(is.read());
        }

        //错误实例  ==>文件大小受限
        is.read(bytes);
        os.write(bytes);


        //关闭读写流
        is.close();
        os.close();
    }
}