String savepath = ServletActionContext.getServletContext().getRealPath("/upload");System.out.println(savepath);    try {    File desc = new File(savepath,picFileName);    //FileUtils.copyFile(pic, desc);  《--采用此種方法以下均可省略，較簡(jiǎn)單    InputStream is = new FileInputStream(pic);    OutputStream s = new FileOutputStream(desc);    byte[] buf = new byte[1024];    int len;    while((len=is.read(buf))!=-1){        os.write(buf);    }    is.close();    os.close();    } catch (Exception e) {        e.printStackTrace();    }

    易錯(cuò)點(diǎn)：若寫成--》is.read(buf)<0 將無(wú)法讀取過(guò)來(lái)， 但是會(huì)在目標(biāo)路徑生成一個(gè)零字節(jié)文件！