struts2的Action中如何取得request ,session,application域对象（IOC方式和非IOC方式）

傷城~ 2022-06-06 03:07 129阅读 0赞

**struts2的Action中如何取得request ,session,application域对象（IOC方式和非IOC方式）**

**IOC方式获取域对象的方法有两种：**

1、实现ApplicationAware, RequestAware, SessionAware接口,通过IoC取得Map类型。

public class User4Action implements ApplicationAware, RequestAware, SessionAware {
    
    	/*域对象传值方法（IOC方式）
    	 域对象--范围对象
    	 application---ServletContext
    	 session---HttpSession
    	 request---HttpServletRequest
    	 response--HttpServletResponse*/
    	 
    	 // 声明application属性
    	private Map<String, Object> application;
    	 // 声明 request属性
    	private Map<String, Object> request;
    	 // 声明session属性
    	private Map<String, Object> session;
    
    	@Override
    	public void setSession(Map<String, Object> session) {
    		this.session = session;
    	}
    
    	@Override
    	public void setRequest(Map<String, Object> request) {
    		this.request = request;
    	}
    
    	@Override
    	public void setApplication(Map<String, Object> application) {
    		this.application = application;
    	}
    
    	public String insert() {
    		// 从域中取出值
    		Object id = application.get("id");
    		Object name = request.get("name");
    		Object content = session.get("content");
    
    		System.out.println(id + "," + name + "," + content);
    		// 设置值到域中
    		application.put("id", "application");
    		request.put("name", "request");
    		session.put("content", "session");
    
    		return "insert";
    	}
    }

2、实现ServletRequestAware,ServletContextAware接口，通过IoC取得真实类型。

public class User2Action implements ServletContextAware, ServletRequestAware, ServletResponseAware {
    
    	/* 域对象传值方法（IOC方式）
    	 域对象--范围对象
    	 application---ServletContext
    	 session---HttpSession
    	 request---HttpServletRequest
    	 response--HttpServletResponse*/
    	 
    	private ServletContext application;
    	private HttpServletRequest request;
    	private HttpServletResponse response;
    	private HttpSession session;
    
    	@Override
    	public void setServletResponse(HttpServletResponse response) {
    		this.response = response;
    	}
    
    	@Override
    	public void setServletRequest(HttpServletRequest request) {
    		this.request = request;
    	}
    
    	@Override
    	public void setServletContext(ServletContext application) {
    		this.application = application;
    	}
    
    
    	public String insert() {
    		//从域对象中取出值
    		String id = (String) application.getAttribute("id");
    		String name = (String) request.getAttribute("name");
    		String content = (String) request.getSession().getAttribute("content");
    		System.out.println(id + "," + name+","+content);
    
    		//将值添加到域对象中
    
    		application.setAttribute("id", "application");
    		session.setAttribute("name", "session");
    		request.setAttribute("content", "request");
    
    		return "insert";
    	}
    
    }

**非IOC方式方式获取域对象：**

public class UserAction {
    	// 域对象传值方法（非IOC方式）
    	
    
    	public String insert() {
    		// 获取域对象
    		ServletContext application = ServletActionContext.getServletContext();
    		HttpServletRequest request = ServletActionContext.getRequest();
    		HttpSession session = ServletActionContext.getRequest().getSession();
    		HttpServletResponse response = ServletActionContext.getResponse();
    
    		// 取出域对象值
    		String id = (String) application.getAttribute("id");
    		String name = (String) request.getAttribute("name");
    		String sessionvalue = (String) session.getAttribute("session");
    		System.out.println(id + "," + name + "," + sessionvalue);
    
    		// 给域对象添加值
    		application.setAttribute("key", "application");
    		session.setAttribute("key", "session");
    		request.setAttribute("key", "request");
    
    		return "insert";
    	}
    
    }