controller层接收前台参数
1.利用@RequestParam注解
代码：

@Controller
public class Login{
    @RequestMapping("/login")
    //使用@RequestParam注解接收前台参数
    public String login(@RequestParam("userName") String userName , @RequestParam("passWord") String passWord , Model model){
        if("admin".equals(userName) && "admin".equals(passWord)){
            model.addAttribute("username" , userName);
            model.addAttribute("password" , passWord);
            return "loginSuccess.jsp";
        }else {
              returne "login.jsp";
        }
    }

}

2.当参数少时，直接在方法中写参数
代码：

@Controller
publib class Login{
    public  String login(String userName , String passWord , Model model){
        if("admin".equals(userName) && "admin".equals(passWord)){
            model.addAttribute("username" , userName);
            model.addAttribute("password" , passWord);
            return "loginSuccess.jsp"
        }else{
             returne "login.jsp";  
        }
    }

}

3.使用HttpServletRequest接收(get和post方式都可以)
代码：

public String login(HttpServletRequest request){
    String username = request.getParameter("userName");
    String password = request.getParameter("password"); 
    System.out.print(username);
    System.out.print(password);
}

4.将参数封装到bean中

 public class User{  
  private String name;  
  private String pass;  
}  

@RequestMapping("/login.do")  
public String login(User user)  {  
    syso(user.getName());  
    syso(user.getPass());  
}