java 另存新檔下載檔案時重新命名檔案

public void  filedown() throws Exception {String fileName = inputPath.replace(inputPath.substring(0,inputPath.lastIndexOf("/",inputPath.length())),"/data/backup"); //原來檔案的路徑String filepath = inputName.substring(inputName.lastIndexOf("/") + 1, inputName.length()); //另存新檔的檔案名稱// String fileName = inputPath.substring(inputPath.lastIndexOf("/") + 1, inputPath.length());File file=new File(inputPath);ServletActionContext.getResponse().setHeader("Content-Disposition", "attachment; filename=" + new String(filepath.getBytes("gb2312"), "iso-8859-1"));// OutputStream outputStream = ServletActionContext.getResponse().getOutputStream();// byte[] mybyte =new byte[1024];// InputStream input =new FileInputStream(file);// int temp=-1;// while((temp=input.read(mybyte))!=-1){// outputStream.write(mybyte,0,temp);// }// outputStream.flush();//建立檔案輸入輸出資料流  OutputStream output = null;  FileInputStream fis = null;  try{    //建立File對象    File f = new File(fileName);    //建立檔案輸入輸出資料流對象    output = ServletActionContext.getResponse().getOutputStream();    fis = new FileInputStream(f);    //設定每次寫入緩衝大小    byte[] b = new byte[(int)f.length()];    //out.print(f.length());    //把輸出資料流寫入用戶端    int i = 0;    while((i = fis.read(b)) > 0){      output.write(b, 0, i);      System.out.println("列印"+i);  }    output.flush();  }  catch(Exception e){    e.printStackTrace();  }  finally{    if(fis != null){      fis.close();      fis = null;    }    if(output != null){      output.close();      output = null;    }  }return;}