1 public class UserFilter implements Filter {
 2
 3     @Override
 4     public void destroy() {
 5         // TODO Auto-generated method stub
 6
 7     }
 8
 9     @Override
10     public void doFilter(ServletRequest request, ServletResponse response,
11             FilterChain chain) throws IOException, ServletException {
12         HttpServletRequest req = (HttpServletRequest) request;
13         HttpServletResponse res = (HttpServletResponse) response;
14         // 判断当前session是否有用户信息
15         if(req.getSession().getAttribute("user") == null) {
16             //保存当前客户想要去的url地址
17             String goURL = req.getServletPath();//获得用户想要去的地址
18             String param = req.getQueryString(); //获得地址中携带的参数
19             if(param != null) {
20                 goURL = goURL + "?" + param; //重新拼好请求地址+参数
21             }
22             //把当前客户想要访问的地址，存储到session中
23             req.getSession().setAttribute("goURL", goURL);
24
25             //非法请求，跳转到登陆页面
26             req.getSession().setAttribute("error", "非法请求，请登录！");
27             res.sendRedirect(req.getContextPath() + "/ulogin.jsp");
28         } else {
29             //如果有下一个过滤器则跳转，否则直接到目标页面
30             chain.doFilter(request, response);
31         }
32     }
33
34     @Override
35     public void init(FilterConfig config) throws ServletException {
36         // TODO Auto-generated method stub
37
38     }
39 }

 1 @Controller("userAction")
 2 @Scope("prototype")
 3 public class UserAction extends BaseAction<User> {
 4     public String login() {
 5         //进行登陆的判断
 6         model = userService.login(model);
 7         if(model == null) {
 8             session.put("error", "登陆失败");
 9             return "login";
10         } else {
11             //登录成功，先将用户存储到session中
12             session.put("user", model);
13             //根据session中goURL是否有值而决定页面的跳转
14             if(session.get("goURL") == null) {
15                 return "index"; //跳到首页
16             } else {
17                 return "goURL";
18             }
19         }
20     }
21 }

 1 //userService接口
 2 public interface UserService extends BaseService<User> {
 3     //用户登陆，成功返回该User
 4     public User login(User user);
 5 }
 6
 7 //userServiceImpl实现类
 8 @Service("userService")
 9 public class UserServiceImpl extends BaseServiceImpl<User> implements
10         UserService {
11
12     @Override
13     public User login(User user) {
14         String hql = "from User u where u.login=:login and u.pass=:pass";
15         return (User) getSession().createQuery(hql) //
16             .setString("login", user.getLogin()) //
17             .setString("pass", user.getPass()) //
18             .uniqueResult();
19     }
20
21 }