优化 jsp 判断性能

src/main/java/com/jfinal/core/JFinalFilter.java

@@ -134,21 +134,21 @@ public class JFinalFilter implements Filter {
 		log = Log.getLog(JFinalFilter.class);
 	}
 	
-	boolean isJsp(String target) {
-		int lastIndexOf = target.lastIndexOf(".");
-		if (lastIndexOf > -1) {
-		    String t = target.substring(lastIndexOf + 1);
-		    int len = t.length();
-		    int i = 0;
-		    char c;
-		    if (i < len && ((c = t.charAt(i++)) == 'j' || c == 'J')) {
-		        if (i < len && ((c = t.charAt(i++)) == 's' || c == 'S')) {
-		            if (i < len && ((c = t.charAt(i)) == 'p' || c == 'P')) {
-		                return true;
-		            }
-		        }
-		    }
-		}
-		return false;
-	}
+    boolean isJsp(String target) {
+        int lastIndexOf = target.lastIndexOf('.');
+        if (lastIndexOf > -1) {
+            String t = target.substring(lastIndexOf + 1);
+            int len = t.length();
+            int i = 0;
+            char c;
+            if (i < len && ((c = t.charAt(i++)) == 'j' || c == 'J')) {
+                if (i < len && ((c = t.charAt(i++)) == 's' || c == 'S')) {
+                    if (i < len && ((c = t.charAt(i)) == 'p' || c == 'P')) {
+                        return true;
+                    }
+                }
+            }
+        }
+        return false;
+    }
 }