我的mvc小框架

mvc control

package com.app;

import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;

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

public class BaseServlet extends HttpServlet {

	private static final long serialVersionUID = 3184686435203556699L;
	private final String errorUi = " .errorUi { list-style:none}\n"
			+ ".errorUi li{border-top:0px;border:solid 1px blue; } ";

	/***
	 * author:[e-mail]
	 */
	private boolean debug = false;

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		execute(req, resp);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		execute(req, resp);

	}

	/***
	 * 通过反射方式 实现执行类的方法
	 * 
	 * @param req
	 * @param resp
	 */
	private void execute(HttpServletRequest req, HttpServletResponse resp) {
		String debugMode = this.getServletConfig()
				.getInitParameter("debugMode");
		System.out.println("debug mode=" + debugMode);
		if (debugMode != null) {
			debug = true;
		}
		String path = req.getContextPath();
		String requestUrl = req.getRequestURI();

		int index = requestUrl.indexOf(path);
		if (index != -1) {
			String actionClass = requestUrl
					.substring(index + path.length() + 1);
			// 去掉前面的前缀
			index = actionClass.indexOf("/");
			actionClass = actionClass.substring(index + 1);
			actionClass = actionClass.replace("/", ".");
			String action = req.getParameter("action");
			System.out.println(" 执行 " + actionClass + " 方法  " + action);
			if (action != null) {
				try {
					Class<?> baseCls = Class.forName(actionClass);
					Method baseMethod = baseCls
							.getMethod(action, HttpServletRequest.class,
									HttpServletResponse.class);
					Constructor cons = baseCls.getConstructor();
					Object instanceObj = cons.newInstance();
					baseMethod.invoke(instanceObj, req, resp);
				} catch (Exception e) {
					System.out.println(actionClass
							+ "  发生错误 ------------------------- ");
					e.printStackTrace();
					System.out.println(" ------------ end ------------- ");
					if (debug) {
						try {
							PrintWriter out = resp.getWriter();
							out.println("<style>");
							out.println(errorUi);
							out.println("</style>");
							out.println("<ul class='errorUi'>");
							out.print("<li> 发生错误  " + e.getMessage() + "</li>");
							out.print("<li>错误详细信息 :</li>");
							out.print("<li style='background:green; color:white'>");
							e.printStackTrace(out);
							out.print("</ul>");
						} catch (IOException ex) {

							ex.printStackTrace();
						}
					}
				}
			}
		}

	}
}

web.xml配置

<servlet> 
		<servlet-name>baseServlet</servlet-name>
		<servlet-class>com.app.BaseServlet</servlet-class>
		<init-param>
			<param-name>debugMode</param-name>
			<param-value>true</param-value>
		</init-param>
	</servlet>
	<servlet-mapping>

		<servlet-name>baseServlet</servlet-name>
		<url-pattern>/business/*</url-pattern>
	</servlet-mapping>

测试类

package com.app;

import java.io.IOException;
import java.io.PrintWriter;

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

public class UserAction {

	/**
	 * UserAction
	 */
	private static final long serialVersionUID = -6881406555415037229L;

	public void doUser(HttpServletRequest req, HttpServletResponse resp) {
		try {
			PrintWriter out = resp.getWriter();
			out.println(" hello world");
		} catch (IOException e) {

			e.printStackTrace();
		}

	}

}

访问方法
http://localhost:1983/mvc/business/com.app.UserAction?action=doUser

工程下载

评论

1 楼 lnwazg 2011-12-04  

不错，一起学习了！