一个简单的servlet例子，实现图片的上传功能，上传的图片给  HttpServletResponse 对象

public class BackGroundLogoServlet extends HttpServlet{   private static final Logger m_logger=Logger.getLogger (BackGroundLogoServlet. class);      @Override   public void init(ServletConfig config) throws ServletException {      super.init(config);      m_logger.debug ( "BackGroundLogoServlet init.");   }      @Override   protected void doGet(HttpServletRequest request, HttpServletResponse response)         throws ServletException{        response.setContentType( "image/png");      response.setHeader( "Access-Control-Allow-Origin", "*");      String fileName = request.getParameter( "filename");//获取参数值titlebar_logo.png      File file = new File( "D:\\"+ fileName);//读取D:\\titlebar_logo.png图片      FileInputStream fis = null;      BufferedOutputStream out= null;      try      {        fis = new FileInputStream(file);        out = new BufferedOutputStream(response.getOutputStream());        byte[] buffer= new byte[1024];        int len;        while((len=fis.read(buffer))!=-1)        {          //read the file from local disk          //write to client          out.write(buffer, 0, len);             out.flush();          m_logger.debug ( "background pic upload success !");        }      }      catch (FileNotFoundException e)      {        try        {          response.reset();          //set content type once again          response.setContentType("text/html;charset=utf-8" );          //give error message to client          response.getWriter().println( "文件未找到" );        }        catch (IOException e1)        {          e1.printStackTrace();        }        e.printStackTrace();      }      catch (IOException e)      {        e.printStackTrace();      }      finally      {        try        {          if(fis!= null){          fis.close();        }        if(out!= null){          out.close();        }      }      catch (IOException e)      {        e.printStackTrace();      }    }         }

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