servlet实现图片上传功能

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();
      }
    }
      
   }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。