java-springmvc4-几种获取 HttpServletRequest 对象的方式

红太狼 2024-02-17 21:32 31阅读 0赞

以下的 request 实例都编号了，一共 4 种 方式  
1.@Autowired 方式  
2.public void Test(HttpServletRequest request1, HttpServletResponse resp,HttpSession session1) 方式  
3.((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest(); 方式  
4.Global.getHttpServletRequest(); 方式，该方式基于 第三种做的封装  
  
  
方法4 最灵活，不需要每个 action 中都定义 HttpServletRequest 参数。  
  
  
LoginController.java

@Controller
 @RequestMapping("/demo")
 public class LoginController{
 	@Autowired
 	private HttpServletRequest request2;
 
 
 
 
 	@RequestMapping("test")
 	@ResponseBody
 	public void Test(HttpServletRequest request1, HttpServletResponse resp,HttpSession session1){
 		resp.setCharacterEncoding("UTF=8");
 		resp.setContentType("text/html;charset=UTF-8");
 		 
 		String key = "test_date";
 		HttpSession session = request1.getSession();
 		session.setAttribute(key, new Date());
 		String sessionId = session.getId();
 		Date time = (Date)session.getAttribute(key);
 
 
 		HttpServletRequest request3 = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();
 		HttpServletRequest request4 = Global.getHttpServletRequest();
 		
 		//判断session是不是新创建的
 		try {
 			if (session.isNew()) {
 					resp.getWriter().print(java.text.MessageFormat.format(
 							"【{0}】session创建成功，session的id是：{1}{2}{3}{4}{5}"
 							, StringExtend.getString(time)
 							, sessionId
 							, session1.getId()
 							, request2.getSession().getId()
 							, request3.getSession().getId()
 							, request4.getSession().getId()));
 				
 			}else {
 				resp.getWriter().print(java.text.MessageFormat.format(
 						"【{0}】服务器已经存在该session了，session的id是：{1}{2}{3}{4}{5}"
 							, StringExtend.getString(time)
 							, sessionId
 							, session1.getId()
 							, request2.getSession().getId()
 							, request3.getSession().getId()
 							, request4.getSession().getId()));
 			}
 		} catch (IOException e) {
 				// TODO Auto-generated catch block
 				e.printStackTrace();
 		}
 	}

Global.java

import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpSession;
    
    
    import org.springframework.web.context.request.RequestContextHolder;
    import org.springframework.web.context.request.ServletRequestAttributes;
    
    
    
    
    /** 
    * 使用该类必须在 web.xml 中添加监听（org.springframework.web.context.request.RequestContextListener）
    * 该作用域仅适用于WebApplicationContext环境
    */
    public class Global {
    	static String _loginSessionKey="login_session";
    	/**
    	 * 获取当前请求session
    	 * @return
    	 */
    	public static HttpServletRequest getHttpServletRequest(){
    		HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder
    				.getRequestAttributes())
    				.getRequest();
    		return request;
    	}	
    	/**
    	 * 获取当前请求session
    	 * @return
    	 */
    	public static HttpSession getHttpSession(){
    		return getHttpServletRequest().getSession();
    	}
    }

web.xml 加入监听

<listener> 
 	<listener-class> 
 		org.springframework.web.context.request.RequestContextListener 
 	</listener-class> 
 </listener>