在Struts2中访问Web页面元素request、response、session、application的四种方法-优快云博客

本文详细介绍了在Struts2中通过容器、IOC等不同方式获取request、response、session、application的方法，包括使用Map类型和原始类型的具体实现。

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在Struts2中获取Web页面元素request、response、session、application有两种形式，一种是Map类型，另一种是真实类型HttpServletRequest, HttpSession, ServletContext的引用。一共有四种获取方法，如下所示：

第一种：依赖于容器，Map类型：

private Map request; private Map session; private Map application; public LoginAction1(){ request = (Map)ActionContext.getContext().get("request"); session = ActionContext.getContext().getSession(); application = ActionContext.getContext().getApplication(); }

第二种：使用IOC，Map类型，推荐使用的一种方式：

public class LoginAction2 extends ActionSupport implements RequestAware, SessionAware, ApplicationAware { private Map<String, Object> request; private Map<String, Object> session; private Map<String, Object> application; public void setRequest(Map<String, Object> request) { this.request = request; } public void setSession(Map<String, Object> session) { this.session = session; } public void setApplication(Map<String, Object> application) { this.application = application; }

第三种：依赖于容器，原始类型：

private HttpServletRequest request; private HttpSession session; private ServletContext application; public LoginAction3(){ request = ServletActionContext.getRequest(); session = request.getSession(); application = session.getServletContext(); }

第四种：IOC，原始类型

public class LoginAction4 extends ActionSupport implements ServletRequestAware { private HttpServletRequest request; private HttpSession session; private ServletContext application; public void setServletRequest(HttpServletRequest request) { this.request = request; this.session = this.request.getSession(); this.application = this.session.getServletContext(); }