【300天】每日項目總結系列038（2017.12.02）

叨叨兩句

1. ~

Filter

自動登陸

1. 登陸頁面填寫信息，提交後跳轉至loginServlet
2. 調用service方法處理登陸業務
3. 判斷返回是否爲空，若不爲空，則說明登陸成功
4. 若是登陸成功，判斷是否須要自動登陸
5. 若是須要就將用戶名和密碼存儲到cookie中，並經過response發送客戶端
6. filter到cookie中獲取用戶名和密碼
7. 調用service的方法，根據用戶名和密碼查詢user對象
8. 將user對象存儲到session中
9. 放行

public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try {
            //1.得到用戶名和密碼
            String username = request.getParameter("username");
            String password = request.getParameter("password");
            
            //2.調用業務,進行登陸
            LoginService loginService = new LoginService();
            User user = loginService.login(username,password);
            
            //3.判斷用戶是否爲空
            if(user != null){
                //登陸成功
                //response.getWriter().print("Login Success...");
                String auto = request.getParameter("auto");
                
                if(auto != null && "ok".equalsIgnoreCase(auto)){
                    System.out.println("用戶勾選了自動登陸...");
                    Cookie cookie = new Cookie("autoLogin", username+"-"+password);
                    cookie.setPath(request.getContextPath());
                    cookie.setMaxAge(60*60*24);
                    response.addCookie(cookie);    
                }
                
            
                
                request.getSession().setAttribute("user", user);
                response.sendRedirect(request.getContextPath()+"/WEB01/index.jsp");
            }else{
                //登陸失敗
                response.getWriter().print("Login Fail...");
            }
            
        } catch (SQLException e) {
            e.printStackTrace();
            //登陸失敗
            response.getWriter().print("Login Fail...");
        }

    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}