paramservlet.java

一个网上购书系统

/*
 * Created on 2006-4-15
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package com.bookstore.svlt;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
 * @author chengqiang
 *
 */
public class ParamServlet  extends HttpServlet
{
    /**
	 * 
	 */
	private static final long serialVersionUID = -1786344672836615104L;
	public String url;
    public String pid;
    public String targetId;
    public String urlerr;
    public String callerUrl;
    public String action;
    public String actionCmd;
    public String msg;
    public String unitId;
    public String unitName;
    public HttpSession bySession;
    public boolean debug;
    
    
    public void byHttpService(HttpServletRequest request, HttpServletResponse response , String charSet)
    throws ServletException, IOException
    {
	    request.setCharacterEncoding(charSet);
     	response.setContentType("text/html;charset="+charSet);
	    bySession = createGetSession(request);
	    getByUrl(request);
	    getByUnitId(request);
	    getByUrlErr(request);
	    actionCmd = getByAction(request);
	    getByTargetId(request);
	    getByPid(request);
	    getByMsg(request);
	    callerUrl = url;
	    request.setAttribute("callerUrl", callerUrl);
	    bySession.setAttribute("callerUrl", callerUrl);
    }
    
    public HttpSession createGetSession(HttpServletRequest request)
    {
        HttpSession s = request.getSession(false);
        if(s == null)
            s = request.getSession(true);
        return s;
    }
    public void getByUrl(HttpServletRequest request)
    {
        try
        {
            url = request.getParameter("url");
            if(url == null || url == "")
                url = (String)bySession.getAttribute("url");
            if(url == null || url == "")
                url = (String)request.getAttribute("url");
        }
        catch(Exception exception) { }
        finally { }
    }


    public String getByAction(HttpServletRequest request)
    {
        try
        {
            action = request.getParameter("action");
            if(action == null || action == "")
                action = (String)bySession.getAttribute("action");
            if(action == null || action == "")
                action = (String)request.getAttribute("action");
            return action;
        }
        catch(Exception ex)
        {
            return null;
        }
    }

    public void getByUnitId(HttpServletRequest request)
    {
        try
        {
            unitId = request.getParameter("unitId");
            if(unitId == null || unitId == "")
                unitId = (String)bySession.getAttribute("unitId");
            if(unitId == null || unitId == "")
                unitId = (String)request.getAttribute("unitId");
        }
        catch(Exception exception) { }
        finally { }
    }

    public void getByTargetId(HttpServletRequest request)
    {
        try
        {
            targetId = request.getParameter("targetId");
            if(targetId == null || targetId == "")
                targetId = (String)bySession.getAttribute("targetId");
            if(targetId == null || targetId == "")
                targetId = (String)request.getAttribute("targetId");
        }
        catch(Exception exception) { }
        finally { }
    }

    public void getByPid(HttpServletRequest request)
    {
        try
        {
            pid = request.getParameter("pid");
            if(pid == null || pid == "")
                pid = (String)bySession.getAttribute("pid");
            if(pid == null || pid == "")
                pid = (String)request.getAttribute("pid");
        }
        catch(Exception exception) { }
    }

    public void getByMsg(HttpServletRequest request)
    {
        try
        {
            msg = request.getParameter("msg");
            if(msg == null || msg == "")
                msg = (String)bySession.getAttribute("msg");
            if(msg == null || msg == "")
                msg = (String)request.getAttribute("msg");
        }
        catch(Exception exception) { }
    }

    public void getByUrlErr(HttpServletRequest request)
    {
        try
        {
            urlerr = request.getParameter("urlerr");
            if(urlerr == null || urlerr == "")
                urlerr = (String)bySession.getAttribute("urlerr");
            if(urlerr == null || urlerr == "")
                urlerr = (String)request.getAttribute("urlerr");
        }
        catch(Exception exception) { }
        finally { }
    }
    

}