login/logout切换

1. 前端按钮

 <img border="0" width="18" height="18" src="<%=basePath %>/style/images/top/user.png" /> <font style="font-size:11px; font-family:Microsoft YaHei"> ${usersession.name }
                <c:forEach items="${usersession.roles }" var="r">
                	${r.name }
                </c:forEach>
               </b></font>
			
			<%if(session.getAttribute("usersession")!=null){%>
				<input type="button"   value="Log Out" onclick="javascript:logout()" style="color:#2c3e50; font-size:12px;font-weight:bold; border-radius:3px; vertical-align:middle;height:20px;  70px; "/>
			<%}else {%>
				<input type="button"   value="Log In" onclick="javascript:login()" style="color:#2c3e50; font-size:12px;font-weight:bold; border-radius:3px; vertical-align:middle;height:20px;  70px; "/>
			<%} %>

2. js函数

<script>
		function logout(){
			$.getJSON("/portal/user/logout?rand="+Math.random(),function(data){
				if("success"==data.result){
					parent.location.href="/portal/home/index";
				}
				else{
					alert("logout failure!");
				}
			});			
		}
		function login(){
			window.open("/portal/user/loginUI","_parent");			
		}
	</script>

3. controller端实现

@RequestMapping("/login")
	public String login(String loginName, String password, HttpSession session,HttpServletRequest request){
		//session.invalidate();
		User user = userService.findByLoginNameAndPassword(loginName, password);
		if(user == null){
			request.setAttribute("loginError", "用户名或者密码错误");			
			return "/userController/loginUI";
		}
		else{
			session.setAttribute("usersession", user);
		}
		return "/homeController/index";
	}
	
	@RequestMapping("/logout")
	public String logout( HttpSession session,HttpServletResponse response){		
		session.removeAttribute("usersession");
		session.invalidate();
		JSONObject data = new JSONObject();
		try {
			data.put("result", "success");
		} catch (Exception e) {
			System.out.println(e.getMessage());
		}
		
		
		PrintWriter out = null;
		response.setCharacterEncoding("UTF-8");
		response.setContentType("text/html; charset=UTF-8"); 
	    try {
	    	out=response.getWriter();
	        out.write(data.toString());
	        out.flush();
			out.close();	
			return null;
	    } catch (IOException e) {
	        e.printStackTrace();
	    }	   
		//return "/userController/logout";
		return "/homeController/index";
	}