Two important Steps  while reading an Image with a Servlet.

i) Getting the MIME type and setting to Response .

 String mimeType = getServletContext().getMimeType(filename);    
      res.setContentType(mimeType); 

ii) Reading the Image in small chunks as follows
        byte[] buf = new byte[1024];  
 

public class ImageReader extends HttpServlet {

public void doGet(HttpServletRequest req, HttpServletResponse res)  
                                throws ServletException, IOException {  
        
      FileInputStream fis = null;  
      String filename  = "C:/Img/yourOwn.jpg";    
      String mimeType = getServletContext().getMimeType(filename);    
      if (mimeType == null) {    
          sc.log("Could not get MIME type of "+filename);    
          res.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);    
          return;    
       }    
    
      res.setContentType(mimeType);  
            
      ServletOutputStream output = res.getOutputStream();  
      try {  
        fis = new FileInputStream(new File(filename));  
        byte[] buf = new byte[1024];  
        int i = 0;  
        while ((i = fis.read(buf)) != -1) {  
            output.write(buf, 0, i);  
        }  
        output.flush();  
      } finally {  
          fis.close();  
          output.close();  
      }  
     }  
 } 
}

Back to top