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

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

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{@Autowiredprivate  HttpServletRequest request2;@RequestMapping("test")@ResponseBodypublic 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：</br>{1}</br>{2}</br>{3}</br>{4}</br>{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：</br>{1}</br>{2}</br>{3}</br>{4}</br>{5}", StringExtend.getString(time), sessionId, session1.getId(), request2.getSession().getId(), request3.getSession().getId(), request4.getSession().getId()));}} catch (IOException e) {// TODO Auto-generated catch blocke.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


<!-- 5. spring 注册监听，获取上下文中的 HttpServletRequest 对象（对 Global 支持）  -->

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