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{
	@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

  
	  
		org.springframework.web.context.request.RequestContextListener