add WebStatFilter's exclusions, support /foo*, *.html, /bar/index.html

src/main/java/com/alibaba/druid/util/ServletPathMatcher.java

@@ -0,0 +1,41 @@
+package com.alibaba.druid.util;
+
+public class ServletPathMatcher implements PatternMatcher {
+
+    /**
+     * <p>
+     * three type: endsWithMatch(eg. /xxx*=/xxx/xyz), startsWithMatch(eg. *.xxx=abc.xxx), equals(eg. /xxx=/xxx)。
+     * </p>
+     * <b>Notice</b>: *xxx* will match *xxxyyyy. endsWithMatch first.
+     */
+    @Override
+    public boolean matches(String pattern, String source) {
+        if (pattern == null || source == null) {
+            return false;
+        }
+        pattern = pattern.trim();
+        source = source.trim();
+        if (pattern.endsWith("*")) {
+            // pattern: /druid* source:/druid/index.html
+            int length = pattern.length() - 1;
+            if (source.length() >= length) {
+                if (pattern.substring(0, length).equals(source.substring(0, length))) {
+                    return true;
+                }
+            }
+        } else if (pattern.startsWith("*")) {
+            // pattern: *.html source:/xx/xx.html
+            int length = pattern.length() - 1;
+            if (source.length() >= length && source.endsWith(pattern.substring(1))) {
+                return true;
+            }
+        } else {
+            // pattern: /druid/index.html source:/druid/index.html
+            if (pattern.equals(source)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+}