http在request中放参数并在前台获取_http-request携带参数

//java部分

ActionContext ctx = ActionContext.getContext();
HttpServletRequest request = (HttpServletRequest)ctx.get(ServletActionContext.HTTP_REQUEST);   
HttpServletResponse response = (HttpServletResponse)ctx.get(ServletActionContext.HTTP_RESPONSE);

request.setAttribute("req", java.net.URLEncoder.encode(req,"utf-8"));
request.setAttribute("cmd", "toCD");
request.setAttribute("sys", "1");

//jsp页面

<input type="hidden" name="req" value=${req}></input>
<input type="hidden" name="cmd" value=${cmd}></input>
<input type="hidden" name="sys" value=${sys}></input>