传智Struts2笔记（10）获取request/session/application属性

一时失言乱红尘 2022-09-28 01:27 228阅读 0赞

**访问或添加request/session/application属性**

Java代码

1.  **public** String scope() **throws** Exception\{   
2.     ActionContext ctx = ActionContext.getContext();   
3.     ctx.getApplication().put("app", "应用范围");//往ServletContext里放入app   
4.     ctx.getSession().put("ses", "session范围");//往session里放入ses   
5.     ctx.put("req", "request范围");//往request里放入req   
6.     **return** "scope";   
7.  \}

public String scope() throws Exception{
       ActionContext ctx = ActionContext.getContext();
       ctx.getApplication().put("app", "应用范围");//往ServletContext里放入app
       ctx.getSession().put("ses", "session范围");//往session里放入ses
       ctx.put("req", "request范围");//往request里放入req
       return "scope";
    }

JSP:  
<body>  
    $\{applicationScope.app\} <br>  
    $\{sessionScope.ses\}<br>  
    $\{requestScope.req\}<br>  
</body>  
  
  
**获取HttpServletRequest / HttpSession / ServletContext / HttpServletResponse对象**  
  
  
  
方法一，通过ServletActionContext.类直接获取：

Java代码

1.  **public** String rsa() **throws** Exception\{   
2.      HttpServletRequest request = ServletActionContext.getRequest();   
3.      ServletContext servletContext = ServletActionContext.getServletContext();   
4.      request.getSession()       
5.      HttpServletResponse response = ServletActionContext.getResponse();   
6.      **return** "scope";   
7.  \}

public String rsa() throws Exception{
    	HttpServletRequest request = ServletActionContext.getRequest();
    	ServletContext servletContext = ServletActionContext.getServletContext();
    	request.getSession() 	
    	HttpServletResponse response = ServletActionContext.getResponse();
    	return "scope";
    }

方法二，实现指定接口，由struts框架运行时注入：

Java代码

1.  **public** **class** HelloWorldAction **implements** ServletRequestAware, ServletResponseAware, ServletContextAware\{   
2.      **private** HttpServletRequest request;   
3.      **private** ServletContext servletContext;   
4.      **private** HttpServletResponse response;   
5.      **public** **void** setServletRequest(HttpServletRequest req) \{   
6.          **this**.request=req;   
7.      \}   
8.      **public** **void** setServletResponse(HttpServletResponse res) \{   
9.          **this**.response=res;   
10.     \}   
11.     **public** **void** setServletContext(ServletContext ser) \{   
12.         **this**.servletContext=ser;   
13.     \}   
14. \}