Java获得文件大小的方法（通过FileInputStream）

根据指定文件创建FileInputStream，调用available方法返回文件大小，容量为byte
                File file = new File("d:hello.gif");
                FileInputStream fis = null;
                try{
                    fis = new FileInputStream(file); 
                    System.out.println("文件size:"+String.valueOf(fis.available()/1000)+"k");
                }catch(IOException e1){  
                    System.out.println("IO出错！");
                }  
                }catch(FileNotFoundException e2){  
                    System.out.println("找不到指定文件");
                }