再session中保存用户登录信息

有时候需要在全局范围内保存用户的一些信息：

$("#loginBtn")
							.click(
									function() {
										$
												.ajax({
													type : "post",
													url : "/passport/login.do",
													data : {
														username : $(
																"#username")
																.val(),
														password : $(
																"#password")
																.val()
													},
													dataType : "json",
													success : function(data) {
														if (data.success) {
															location.href = "/admin/goAdmin.do";
														} else {
															alert(data.message);
														}
													},
													error : function(
															XMLHttpRequest,
															textStatus,
															errorThrown) {
														var obj = $
																.parseJSON(XMLHttpRequest.responseText);
														if (obj != null) {
															alert(obj.message);
														}
													}
												});
									})

@RequestMapping(value="/login.do")
	@ResponseBody
	public Map<String,Object> login(
			UserVO vo,
			HttpServletRequest request,HttpServletResponse response){
		
		if(StringUtils.isBlank(vo.getUsername())||StringUtils.isBlank(vo.getPassword())){
			throw new ClientException(Code.CODE_PASSPORT_USERNAMEPASSWORD_NULL);
		}
		userService.login(vo);
		ResponseResult result= new ResponseResult();
		result.setSuccess(true);
		return  result.returnResult();
	}

public int login(UserVO vo) throws ClientException {
		// TODO Auto-generated method stub

		vo.setPassword(MD5Utils.md5(vo.getPassword()));
		User user = getBaseDao().queryForObject("User.selectUserByNameAndPassword",vo);
		
		if (user==null) {
			throw new ClientException(Code.CODE_PASSPORT_USERNAMEPASSWORD_WRONG);
		}
		if(user.getStatus()==Constants.USER_STATUS_DISABLED){
			throw new ClientException(Code.CODE_PASSPORT_USER_DISABLED);
		}
		if(user.getStatus()==Constants.USER_STATUS_LOCKED){
			throw new ClientException(Code.CODE_PASSPORT_USER_LOCKED);
		}
		if(user.getStatus()==Constants.USER_STATUS_EXPIRED){
			throw new ClientException(Code.CODE_PASSPORT_USER_EXPIRED);
		}
		
		HttpSession session = RequestUtil.getRequest().getSession();
		session.setAttribute(Constants.SESSION_KEY, user);
		return user.getId();
	}

将用户User类放入session中。