gdservlet.java

j2ee程序。 spring、xml、 实现增加内容选项。

package com.gd.action;

import java.io.IOException;
import java.util.Enumeration;
import java.util.HashMap;

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

public class GdServlet extends HttpServlet{
	public void init() throws ServletException {
		
  	}

	public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
		doPost(req, res);
	}

	public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
		do_Dispatcher (req, res);
	}

	private void do_Dispatcher (HttpServletRequest req, HttpServletResponse res) {
	    try {
			
			String forwardJsp = (String) req.getParameter("forwardJsp");
			String logicName = (String) req.getParameter("logicName");
		    
		    String systemName = "";

			String ss = req.getServletPath();
			systemName = ss.split("/")[1];

			HashMap infoIn = getRequestToMap(req);

			Action action = (Action) Class.forName(getActionName(systemName,logicName)).newInstance();
			HashMap infoOut = action.doAction(infoIn);
			infoOut.put("systemName", systemName);
			req.setAttribute("infoOut", infoOut);
			
			forward(req, res);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
		}
    }

	private HashMap getRequestToMap(HttpServletRequest req) throws Exception {
		req.setCharacterEncoding("GBK");
		HashMap infoIn = new HashMap();
		for (Enumeration e = req.getParameterNames(); e.hasMoreElements() ;) {
			String strName = (String)e.nextElement();
			String[] values = (String[]) req.getParameterValues(strName);
			if (values == null) {
			    infoIn.put(strName, "");
			} else if (values.length == 1) {
				infoIn.put(strName, values[0]);
			} else {
				infoIn.put(strName, values);
			}
		}
		return infoIn;
	}


	private String getActionName(String systemName ,String actionName)  throws IOException, Exception {
	    if (actionName == null) {
	    	return "com.gd.action.GdAction";
	    } else {
	    	return "com." + systemName + ".action." + actionName;
	    }
	}
	
	private void forward(HttpServletRequest req, HttpServletResponse res) throws Exception {
		HashMap infoOut = (req.getAttribute("infoOut") == null) ? new HashMap() : (HashMap)req.getAttribute("infoOut");
		String forwardJsp = (String)infoOut.get("forwardJsp");
		String sendRedirectJsp = (String)infoOut.get("sendRedirectJsp");
		
		if (null != sendRedirectJsp && !"".equals(sendRedirectJsp)) {
			res.sendRedirect(sendRedirectJsp);
		} else {
			RequestDispatcher rd = req.getRequestDispatcher("/"+ (String)infoOut.get("systemName") +"/jsp/" + forwardJsp+ ".jsp");
			rd.forward(req, res);
		}
	}

	public void destroy() {		
	}
}