login/logout切换

<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;  width: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;  width:70px; "/>
<%} %>

<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>

@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";
}