图片、文件的拷贝（IO流）

布满荆棘的人生 2022-05-30 05:57 202阅读 0赞

IO流，图片、文件的拷贝：

package util;
    
    import java.io.BufferedInputStream;
    import java.io.BufferedOutputStream;
    import java.io.BufferedReader;
    import java.io.BufferedWriter;
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.FileReader;
    import java.io.FileWriter;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.OutputStreamWriter;
    
    public class Main { 
        public static void main(String[] args)
        {
            new Main().copyFile("C:\\Users\\Desktop\\JVM.txt", "C:\\Users\\Desktop\\JVM1.txt");
            new Main().copyPicture("C:\\Users\\Desktop\\aa.jpg", "C:\\Users\\Desktop\\bb.jpg");
        }
    
        /** * 字节流拷贝图片 */
        public void copyPicture(String path1, String path2)
        {
            BufferedInputStream bis = null;
            BufferedOutputStream bos  = null;
            try
            {
                bis = new BufferedInputStream(new FileInputStream(path1));
                bos = new BufferedOutputStream(new FileOutputStream(path2));
                byte[] bs = new byte[10240];
                int len = 0;
                while((len = bis.read(bs)) != -1)
                {
                    bos.write(bs, 0, len);
                }
                System.out.println("拷贝图片成功");
            }
            catch (FileNotFoundException e)
            {
                throw new RuntimeException(path1+" 文件不存在");
            }
            catch (IOException e)
            {
                throw new RuntimeException("拷贝图片失败");
            }
            finally
            {
                try
                {
                    if(null != bis)
                    {
                        bis.close();
                    }
                }
                catch (IOException e)
                {
                    throw new RuntimeException("bis关闭失败");
                }
    
                try
                {
                    if(null != bos)
                    {
                        bos.close();
                    }
                }
                catch (IOException e)
                {
                    throw new RuntimeException("bos关闭失败");
                }
            }
        }
    
        /** * 字符流、字节流都可以拷贝文件 */
        public void copyFile(String path1,String path2)
        {
            BufferedReader br = null;
            BufferedWriter bw = null;
            try
            {
                //设置编码格式
                //br = new BufferedReader(new InputStreamReader(new FileInputStream(path1),"UTF-8"));
                //bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(path2),"UTF-8"));
                br = new BufferedReader(new FileReader(path1));
                bw = new BufferedWriter(new FileWriter(path2));
                int len = 0;
                char[] cs = new char[10240];
                while((len = br.read(cs)) != -1)
                {
                    bw.write(cs, 0, len);
                }
                System.out.println("拷贝文件成功");
            }
            catch (FileNotFoundException e)
            {
                throw new RuntimeException(path1+" 文件不存在");
            }
            catch (IOException e)
            {
                throw new RuntimeException("拷贝文件失败");
            }
            finally
            {
                try
                {
                    if(null != br)
                    {
                        br.close();
                    }
                }
                catch(IOException e)
                {
                    throw new RuntimeException("br关闭失败");
                }
    
                try
                {
                    if(null != bw)
                    {
                        bw.close();
                    }
                }
                catch(IOException e)
                {
                    throw new RuntimeException("bw关闭失败");
                }
            }
    
        }
    
    }