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JFinal is a simple, light, rapid,independent, extensible Java WEB + ORM framework. The feature of JFinal looks like ruby on rails especially ActiveRecord.

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/**
 * Copyright (c) 2011-2023, James Zhan 詹波 ([email protected]).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.jfinal.handler;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Handler.
 * 
 * You can config Handler in JFinalConfig.configHandler() method,
 * Handler can do anything under the jfinal action.
 */
public abstract class Handler {
	
	/**
	 * The next handler
	 */
	protected Handler next;
	
	/**
	 * Use next instead of nextHandler
	 */
	@Deprecated
	protected Handler nextHandler;
	
	/**
	 * Handle target
	 * @param target url target of this web http request
	 * @param request HttpServletRequest of this http request
	 * @param response HttpServletResponse of this http response
	 * @param isHandled JFinalFilter will invoke doFilter() method if isHandled[0] == false,
	 * 			it is usually to tell Filter should handle the static resource.
	 */
	public abstract void handle(String target, HttpServletRequest request, HttpServletResponse response, boolean[] isHandled);
}