Struts2-Action中获取ServletAPI

最新推荐文章于 2018-04-11 20:43:15 发布

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最新推荐文章于 2018-04-11 20:43:15 发布

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分类专栏： Struts2

本文链接：https://blog.youkuaiyun.com/qq_34866380/article/details/79732815

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本文介绍了在Struts2框架中通过三种方式获取HttpServletRequest、HttpSession和ServletContext的方法：利用ActionContext、ServletActionContext以及实现特定接口。文章详细展示了如何通过这些方式设置属性，并在跳转页面中检测其值。

struts2对HttpServletRequest、HttpSession、ServletContext进行了封装，
构造了三个Map对象来替代这三个对象。在action中获取这三个对象的方法有
三种。
1、通过ActionContext获取

        ActionContext ac = ActionContext.getContext();
        Map<String,Object> application = ac.getApplication();
        Map<String, Object> session = ac.getSession();

        ac.put("req", "req");
        application.put("application", "application");
        session.put("session", "session");

2、通过ServletActionContext获取

        HttpServletRequest request = ServletActionContext.getRequest();
        request.setAttribute("req", "req");
        request.getSession().setAttribute("session", "session");
        request.getServletContext().setAttribute("application", "application");

3、通过实现SessionAware，ApplicationAware，RequestAware接口，在实现方法内赋值获取

public class testAction  implements RequestAware,SessionAware,ApplicationAware{

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

    public String execute(){
        System.out.println("struts");

        request.put("req", "request");
        application.put("application", "application");
        session.put("session", "session");
        return "success";
    }
    @Override
    public void setApplication(Map<String, Object> application) {
                this.application = application;
    }
    @Override
    public void setSession(Map<String, Object> session) {
            this.session = session;
    }
    @Override
    public void setRequest(Map<String, Object> request) {
                this.request = request;
    }
}

在action后的跳转页面检测值

request = ${requestScope.req}<br>
session = ${sessionScope.session}<br>
application = ${applicationScope.application}<br>

这里写图片描述