在Action类中操作request,session与前端传递数据 与 jsp获取action传来的session值问题的方法

Action类中操作request,session

法一（推荐）：使用RequestAware,SessionAware接口

1.实现这两个接口

public class NewsAction extends ActionSupport implements RequestAware,SessionAware {}

2.定义两个成员变量

private Map<String,Object> session;
private Map<String,Object> request;

3.重写接口中的方法。

　　 @Override
    public void setRequest(Map<String, Object> arg0) {
        this.request = arg0;
        
    }
    @Override
    public void setSession(Map<String, Object> arg0) {
        // TODO Auto-generated method stub
        this.session = arg0;
    }  

4.使用session.put(),session.get(),request.put(),request.get()

request.put(key, value);
request.get(key);
        
session.put(key, value);
session.get(key);

法二：使用ActionContext.getContext().get("request")

Map<String,Object> request = (Map<String,Object>)ActionContext.getContext().get("request");
request.put(key, value);
request.get(key);

Map<String,Object> session = ActionContext.getContext().getSession();
session.put(key, value);
session.get(key);

法三：使用ServletActionContext.getRequest()

HttpServletRequest request = ServletActionContext.getRequest();
request.setAttribute(arg0, arg1);
request.getAttribute(arg0)

HttpServletRequest req = ServletActionContext.getRequest();
HttpSession session = req.getSession();
session.setAttribute(arg0, arg1);
session.getAttribute(arg0);

jsp获取action传来的session值

法一：用struts标签获取

<s:property value="#session.sessionid"/>

法二：直接用session或request.getSession

<%=session.getAttribute("sessionid");>

<%=request.getSession.getAttribute("sessionid");>

法三：el表达式获取

${sessionScope.sessionid}