Java基础进阶IO流-文件复制

public class CopyTest01 {
    public static void main(String[] args) {
        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            fis = new FileInputStream("C:\\Users\\王一林\\Desktop\\论文pdf\\2122_41_13500_080902_3118070108_BS_001.pdf");
            fos = new FileOutputStream("D:\\2122_41_13500_080902_3118070108_BS_001.pdf");
            //先读，每次读1M数据（1024 * 1024）// 最核心的：一边读，一边写
            byte[] bytes = new byte[1024 * 1024];
            int readCount = 0;
            while((readCount = fis.read(bytes)) != -1){
                //读多少，就写多少API
                fos.write(bytes,0,readCount);
            }
            //最后输出流一定要刷新
            fos.flush();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //这里要分开try，因为如果一起try的话，如果其中一个流出现异常会影响到另一个流的关闭。
            if(fis != null){
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(fos != null){
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

public class Copy02Test01 {
    public static void main(String[] args) {
        FileReader in = null;
        FileWriter out = null;
        try {
            in = new FileReader("IO\\src\\com\\newstudy\\javase\\io\\Copy02Test01.java");
            out = new FileWriter("Copy02Test01.java");
            //读，每次读1MB
            char[] chars = new char[1024 * 512];//1MB
            int readCount = 0;
            //一边读，一边写
            while((readCount = in.read(chars)) != -1){
                //写
                out.write(chars,0,readCount);
            }
            //刷新
            out.flush();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if(in != null){
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(out != null){
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}