servlet实现图片上传功能

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.ihttp://nit(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)

{

http:// 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.BlwlOcclose();

}

if(out!= null){

out.close();

}

}

catch (IOException e)

{

e.printStackTrace();

}

}

}

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