讲解一下RequestMapping,Request请求参数和ModelAndView返回模型和视图

@Controller

@RequestMapping("/student")

public class StudentController {

    private static List studentList=new ArrayList();

    static{

        studentList.add(new Student(1,"ÕÅÈý",11));

        studentList.add(new Student(2,"ÀîËÄ",12));

        studentList.add(new Student(3,"ÍõÎå",13));

    }

    @RequestMapping("/list")

    public ModelAndView list(){

        ModelAndView mav=new ModelAndView();

        mav.addObject("studentList", studentList);

        mav.setViewName("student/list");

        return mav;

    }

    @RequestMapping("/preSave")

    public ModelAndView preSave(@RequestParam(value="id",required=false) String id){

        ModelAndView mav=new ModelAndView();

        if(id!=null){

            mav.addObject("student", studentList.get(Integer.parseInt(id)-1));

            mav.setViewName("student/update");

        }else{

            mav.setViewName("student/add");           

        }

        return mav;

    }