actioncontext.java

如果遇到MD5加密文件

package com.easyjf.web;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
*
* <p>Title:Servlet上下文件处理类</p>
* <p>Description: 通过使用ThreadLocal变量,实现用户当前访问的Servlet上下文环境访问！<br>
*    通过使用ActionContext，在用户的Action类可以访问servlet相关资源.如要访问session对象，直接使用ActionContext.getContext().getSession()即可！</p>
* <p>Copyright: Copyright (c) 2006</p>
* <p>Company: www.easyjf.com</p>
* @author 蔡世友
* @version 1.0
*/
public class ActionContext {
	public static final String HTTP_REQUEST="request";
	public static final String HTTP_RESPONSE="response";
	public static final String HTTP_SESSION="session";
	public static final String HTTP_PARAMETERS="parameters";
	static ThreadLocal actionContext = new ActionContextThreadLocal();
	Map context;
	public ActionContext(Map context)
	{	
		this.context=context;
	}
	/**
     * Sets the action context for the current thread.
     *
     * @param context the action context.
     */
    public static void setContext(ActionContext context) {
        actionContext.set(context);
    }

    /**
     * Returns the ActionContext specific to the current thread.
     *
     * @return the ActionContext for the current thread.
     */
    public static ActionContext getContext() {
        ActionContext context = (ActionContext) actionContext.get();
        if (context == null) {           
            context = new ActionContext(new HashMap());
            setContext(context);
        }
        return context;
    }
    
    public void setContextMap(Map contextMap) {
        getContext().context = contextMap;
    }
    public Map getContextMap() {
        return context;
    }
    public HttpServletRequest getRequest()
    {
    	 HttpServletRequest ret=null;    	
    	if(context.containsKey(HTTP_REQUEST))ret=( HttpServletRequest)context.get(HTTP_REQUEST);
    	return ret;
    }
    public HttpServletResponse getResponse()
    {
    	HttpServletResponse ret=null;    	
    	if(context.containsKey(HTTP_RESPONSE))ret=(HttpServletResponse)context.get(HTTP_RESPONSE);
    	return ret;
    }
    public HttpSession getSession()
    {
    	HttpSession ret=null;    	
    	if(context.containsKey(HTTP_SESSION))ret=(HttpSession)context.get(HTTP_SESSION);
    	else
    	{
    		HttpServletRequest request=getRequest();    		
    		if(request!=null)ret=request.getSession();
    	}    	
    	return ret;
    }
    public Map getParameters()
    {
    	Map ret=null;    	
    	if(context.containsKey(HTTP_PARAMETERS))ret=(Map)context.get(HTTP_PARAMETERS);
    	else
    	{
    		HttpServletRequest request=getRequest();    		
    		if(request!=null)ret=request.getParameterMap();
    	}    	
    	return ret;
    }
    public Object get(Object key) {
        return context.get(key);
    }  
    public void put(Object key, Object value) {
        context.put(key, value);
    }    
	private static class ActionContextThreadLocal extends ThreadLocal {
		protected synchronized Object initialValue() {
            return new ActionContext(new HashMap());
        }
	}
	

}