Trying to create REST-ful URLs with multiple dots in the “filename” part - Spring 3.0 MVC

Question

I\'m using Spring MVC (3.0) with annotation-driven controllers. I would like to create REST-ful URLs for resources and be able to not require (but still opt

Answer 1

Probably, it's an ugly hack, I just wanted to explore extensibility of Spring @MVC. Here is a customized PathMatcher. It uses $ in the pattern as the end marker - if pattern ends with it, marker is removed and pattern is matched by the default matcher, but if pattern has $ in the middle (e.g. ...$.*), such a pattern is not matched.

public class CustomPathMatcher implements PathMatcher {
    private PathMatcher target;

    public CustomPathMatcher() {
        target = new AntPathMatcher();
    }

    public String combine(String pattern1, String pattern2) {
        return target.combine(pattern1, pattern2); 
    }

    public String extractPathWithinPattern(String pattern, String path) {
        if (isEncoded(pattern)) {
            pattern = resolvePattern(pattern);
            if (pattern == null) return "";
        }
        return target.extractPathWithinPattern(pattern, path);
    }

    public Map extractUriTemplateVariables(String pattern,
            String path) {
        if (isEncoded(pattern)) {
            pattern = resolvePattern(pattern);
            if (pattern == null) return Collections.emptyMap();
        }
        return target.extractUriTemplateVariables(pattern, path);
    }

    public Comparator getPatternComparator(String pattern) {
        final Comparator targetComparator = target.getPatternComparator(pattern);
        return new Comparator() {
            public int compare(String o1, String o2) {
                if (isEncoded(o1)) {
                    if (isEncoded(o2)) {
                        return 0;
                    } else {
                        return -1;
                    }
                } else if (isEncoded(o2)) {
                    return 1;
                }
                return targetComparator.compare(o1, o2);
            }        
        };
    }

    public boolean isPattern(String pattern) {
        if (isEncoded(pattern)) {
            pattern = resolvePattern(pattern);
            if (pattern == null) return true;
        }
        return target.isPattern(pattern);
    }

    public boolean match(String pattern, String path) {
        if (isEncoded(pattern)) {
            pattern = resolvePattern(pattern);
            if (pattern == null) return false;
        }
        return target.match(pattern, path);
    }

    public boolean matchStart(String pattern, String path) {
        if (isEncoded(pattern)) {
            pattern = resolvePattern(pattern);
            if (pattern == null) return false;
        }
        return target.match(pattern, path);
    }

    private boolean isEncoded(String pattern) {
        return pattern != null && pattern.contains("$");
    }

    private String resolvePattern(String pattern) {
        int i = pattern.indexOf('$');
        if (i < 0) return pattern;
        else if (i == pattern.length() - 1) {
            return pattern.substring(0, i);
        } else {
            String tail = pattern.substring(i + 1);
            if (tail.startsWith(".")) return null;
            else return pattern.substring(0, i) + tail;
        }
    }
}

Config:

And usage (given "/hello/1.2.3", value is "1.2.3"):

@RequestMapping(value = "/hello/{value}$", method = RequestMethod.GET)
public String hello(@PathVariable("value") String value, ModelMap model)

EDIT:: Now doesn't break "trailing slash doesn't matter" rule