Need Help Reading/Writing an Image using Spring MVC

[laura mccord]

Hi,

I'm converting one of my old projects to use spring mvc and one of the tasks was to read/write an image using a servlet. The jsp contained an image src that looked like this: <img src="/image?file=<%=imagePath%>" /> which executed the servlet and wrote the image on the fly. Things are a little complicated because the image is not on a web server. I had to use jcifs smbfile to retrieve the image off of a windows shared folder. The servlet read in the image and performed resizing.


So, now my dilemma is how do I do the same task using Spring MVC. I started writing an ImageController with a RequestMapping("/image") but my controller never gets executed.


Here are some snippets of what I have:

my jsp

<img src="/image?file=<c:out value="${person.attributes['imagepath']}"/>"/> 

my Controller

import java.io.ByteArrayOutputStream;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import jcifs.Config;
import jcifs.smb.SmbFile;
import jcifs.smb.SmbFileInputStream;

@Controller
@RequestMapping("/image")
public class ImageController {

	@RequestMapping(method = RequestMethod.GET)
	public static byte[] getImage (@RequestParam("file") String imageFileName) throws Exception {
	         if (imageFileName == null) {                        
	           return null;
	        }       
	        // Open image file.        
	        Config.setProperty("jcifs.netbios.wins", "myipaddress");
	        Config.setProperty("jcifs.smb.client.domain", "domain");
	        Config.setProperty("jcifs.smb.client.username", "username");
	        Config.setProperty("jcifs.smb.client.password", "password");
	        SmbFile f = new SmbFile("smb://myimagefolder/" + imageFileName);
	        SmbFileInputStream in = new SmbFileInputStream( f );       
	        ByteArrayOutputStream out = new ByteArrayOutputStream();
	        
	        long t0 = System.currentTimeMillis();

	        byte[] b = new byte[8192];
	        int n, tot = 0;
	        
	        while(( n = in.read( b )) > 0 ) {
	            out.write( b, 0, n );
	            tot += n;	           
	        }

	        long t = System.currentTimeMillis() - t0;
	        in.close();
	        //iconData is the original array of bytes
	        //width - 100, height - 100, quality - 99
	        byte[] imageData = getResizedImage(out.toByteArray(), 100,100, 99);
	        out.close();	                         
	        return imageData;
	        
	}
	

spring-servlet.xml

...
	<bean class="my.project.search.mvc.ImageController"/>
...

web.xml file

...
 <servlet-mapping>
    	<servlet-name>spring</servlet-name>
    	<url-pattern>/image</url-pattern>
    </servlet-mapping>
...

Any suggestions? Or any documentation that may help me would be appreciated too.

Thanks.