字符拷贝和字节拷贝文件对比（FileInputStream，FileOutputStream, FileReader， FileWriter)

拷贝文件的思想就是从源文件路径读取文件，然后往目标文件路径写入文件！

两者区别：字节流无缓冲区，字符流有缓冲区，必须关闭流（close操作）或者清空缓冲区（flush操作）才能写入成功

1:按字节拷贝文件（ FileInputStream，FileOutputStream）

import java.io.FileInputStream;

public class FileCopy

{

    public static void main(String[] args)

    {

        
        // 将  A 文件  拷贝到 B 文件

        FileInputStream fis = null;

        FileOutputStream fos = null;

        try

        {

            fis = new FileInputStream("C:\\Users\\User02\\Desktop\\io.png");

            fos = new FileOutputStream("C:\\Users\\User02\\Desktop\\io.txt",true);

            // 默认会覆盖原有的数据,如果想追加append

            byte[] b = new byte[10];

            int i = 0;

            while((i = fis.read(b)) != -1)

            {

                fos.write(b,0,i);

            }

            

        }

        catch (Exception e)

        {

            e.printStackTrace();

        }finally{

            if(fis != null)

            {

                try

                {

                    fis.close();

                }

                catch (IOException e)

                {

                    e.printStackTrace();

                }

            }

            

            if(fos != null)

            {

                try

                {

                    fos.close();

                }

                catch (IOException e)

                {

                    e.printStackTrace();

                }

            }

            

        }

        

    }

}

2:按字符拷贝文件（FileReader， FileWriter）

import java.io.FileInputStream;

public class TestFileReaderAndWriter

{

    public static void main(String[] args)

    {

        

        // 将  A 文件  拷贝到 B 文件

        FileReader fr = null;

        FileWriter fw = null;

        try

        {

            fr = new FileReader("src/com/itany/coreJava/day18/a.txt");

            fw = new FileWriter("src/com/itany/coreJava/day18/b.txt");

            // 默认会覆盖原有的数据,如果想追加append

            

            System.out.println(fr.getEncoding());

            char[] b = new char[10];

            int i = 0;

            while((i = fr.read(b)) != -1)

            {

                fw.write(b,0,i);

            }

            

        }

        catch (Exception e)

        {

            e.printStackTrace();

        }finally{

            if(fw != null)

            {

                try

                {

                    fw.close();

                }

                catch (IOException e)

                {

                    e.printStackTrace();

                }

            }

            

            if(fr != null)

            {

                try

                {

                    fr.close();

                }

                catch (IOException e)

                {

                    e.printStackTrace();

                }

            }

            

        }

        

    }

}