Serving sitemap.xml and robots.txt with Spring MVC

I'm relying on JAXB to generate the sitemap.xml for me.

My controller looks something like the below, and I have some database tables to keep track of the links that I want to appear in the sitemap:-

SitemapController.java

@Controller
public class SitemapController {

    @RequestMapping(value = "/sitemap.xml", method = RequestMethod.GET)
    @ResponseBody
    public XmlUrlSet main() {
        XmlUrlSet xmlUrlSet = new XmlUrlSet();
        create(xmlUrlSet, "", XmlUrl.Priority.HIGH);
        create(xmlUrlSet, "/link-1", XmlUrl.Priority.HIGH);
        create(xmlUrlSet, "/link-2", XmlUrl.Priority.MEDIUM);

        // for loop to generate all the links by querying against database
        ...

        return xmlUrlSet;
    }

    private void create(XmlUrlSet xmlUrlSet, String link, XmlUrl.Priority priority) {
        xmlUrlSet.addUrl(new XmlUrl("http://www.mysite.com" + link, priority));
    }

}

XmlUrl.java

@XmlAccessorType(value = XmlAccessType.NONE)
@XmlRootElement(name = "url")
public class XmlUrl {
    public enum Priority {
        HIGH("1.0"), MEDIUM("0.5");

        private String value;

        Priority(String value) {
            this.value = value;
        }

        public String getValue() {
            return value;
        }
    }

    @XmlElement
    private String loc;

    @XmlElement
    private String lastmod = new DateTime().toString(DateTimeFormat.forPattern("yyyy-MM-dd"));

    @XmlElement
    private String changefreq = "daily";

    @XmlElement
    private String priority;

    public XmlUrl() {
    }

    public XmlUrl(String loc, Priority priority) {
        this.loc = loc;
        this.priority = priority.getValue();
    }

    public String getLoc() {
        return loc;
    }

    public String getPriority() {
        return priority;
    }

    public String getChangefreq() {
        return changefreq;
    }

    public String getLastmod() {
        return lastmod;
    }
}

XmlUrlSet.java

@XmlAccessorType(value = XmlAccessType.NONE)
@XmlRootElement(name = "urlset", namespace = "http://www.sitemaps.org/schemas/sitemap/0.9")
public class XmlUrlSet {

    @XmlElements({@XmlElement(name = "url", type = XmlUrl.class)})
    private Collection<XmlUrl> xmlUrls = new ArrayList<XmlUrl>();

    public void addUrl(XmlUrl xmlUrl) {
        xmlUrls.add(xmlUrl);
    }

    public Collection<XmlUrl> getXmlUrls() {
        return xmlUrls;
    }
}

For the robots.txt, it looks something like the below, and obviously, you will need to configure it based on your likings:-

RobotsController.java

@Controller
public class RobotsController {

    @RequestMapping(value = "/robots.txt", method = RequestMethod.GET)
    public String getRobots(HttpServletRequest request) {
        return (Arrays.asList("mysite.com", "www.mysite.com").contains(request.getServerName())) ?
                "robotsAllowed" : "robotsDisallowed";
    }
}

Add this line to your dispatcher servlet xml file:

<mvc:resources mapping="/robots.txt" location="/WEB-INF/robots.txt" order="0"/> 

Put the robots.txt at WEB-INF/robots.txt. The file will be accessible by yoursite.com/robots.txt