java _io_文件的拷贝，面向对象风格

Posted 2022-05-09

//文件拷贝，以程序为中转站，从一个文件到另一个文件
可处理图片和文本

思路:

type[] flush = new type[1024]
在 .read(flush) ，时已将将内容存储到字节数组，只需再进行写出即可
os.write(flush,0,len)然后刷新缓存，os.flush()

    public class test
        private String path;
        private String path2;
        private int len;
        private File first;
        private File last;
        private InputStream is;
        private OutputStream os;
        public static void main(String[]args) 
        
            test t=new test("C:/Users/10853/eclipse-workspace/hell/src/hell/abc","D:/d/last");
            t.copy();
         
        public test(String s,String s2) 
        
            this.path=s;
            this.path2=s2;
            first=new File(this.path);
            last=new File(this.path2);
            try
                is=new FileInputStream(first);
                os=new FileOutputStream(last);
            catch(FileNotFoundException e)
            
                e.printStackTrace();
            

    
    public  void copy()
    
            //分段读取
        **byte[] flush =new byte[1024];**
            **try **
                **while((len=is.read(flush))!=-1)**
            **  **
                    **os.write(flush,0,len);    **
                    **os.flush();**  //写出后要刷新
                *****
             catch (IOException e) 
                // TODO Auto-generated catch block
                e.printStackTrace();
            finally 
            try 
                if(os!=null)
                
                    os.close();
                
                if(is!=null)
                
                    is.close();
                
            catch(IOException e)
            
                e.printStackTrace();