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2025-02-24 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >
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This article is about how JSP calls servlet to display pictures. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.
In Servlet, we use doGet (), doPost () and other methods to respond to the GET POST method. Here we respond to GET, so we define a doGet () method that follows the source program:
/ / = start of showimage.java program = =
Only when html is called
Import java.io.*
Import java.text.*
Import java.util.*
Import javax.servlet.*
Import javax.servlet.http.*
Public class showimage extends HttpServlet {
Public void doGet (HttpServletRequest req, HttpServletResponse res)
Throws ServletException, IOException
{
Try {
FileInputStream hFile = new FileInputStream ("d:1.gif"); / / Open the file d:1.gif as a byte stream
Int i=hFile.available (); / / get the file size
Byte data [] = new byte [I]
HFile.read (data); / / read data
HFile.close ()
Res.setContentType ("image/*"); / / sets the returned file type
OutputStream toClient=res.getOutputStream (); / / get the object that outputs binary data to the client
ToClient.write (data); / / output data
ToClient.close ()
}
Catch (IOException e) / / error handling
{
PrintWriter toClient = res.getWriter (); / / get the object that outputs the text to the client
Res.setContentType ("text/html;charset=gb2312")
ToClient.write ("cannot open picture!")
ToClient.close ()
}
}
}
/ * end of showimage.java program * /
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