@Controller：表明該類是一個Controller；

@RequestMapping(參數) ：為類或者方法定義一個url

@RequestParam(value = "id" )：獲取請求中的參數

package com.hongcong.controller;

import java.util.ArrayList;
import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
 
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import com.hongcong.model.StudentModel;

@Controller
//訪問這個controller時，需要在url中加入/student
@RequestMapping("/student")
public class StudentController {
    
    private static List<StudentModel> studentList = new
 
 ArrayList<StudentModel>();
     private int id =3;
    static{
        studentList.add(new StudentModel(1,"張三",11));
        studentList.add(new StudentModel(2,"李六",13));
        studentList.add(new StudentModel(3,"王五",14));
    }
    
　　//訪問這個方法時，url為../student/studentList
    @RequestMapping("/studentList")
    
 
public ModelAndView studentList(){
　　　　 //ModelAndView的作用是傳遞參數和頁面跳轉
        ModelAndView mav = new ModelAndView();
　　　　 //跳轉到student目錄下的studentList.jsp頁面  註：lib目錄下的頁面無法直接訪問
        mav.setViewName("student/studentList");
　　　　 //傳遞參數 頁面可以通過jstl表達式等方法獲取參數
        mav.addObject("studentList", studentList);
        return mav;
    }
    
    @RequestMapping("/preSave")
　　 //@RequestParam(value = "otype",required = false) String otype 是獲取請求中的參數並且賦值給otype這個變量，其中參數required = true時，那這個請求必須要有otype參數，不然會報錯
    public ModelAndView preSave(@RequestParam(value = "id"  ) int id,
            @RequestParam(value = "otype",required = false) String otype){
        ModelAndView mav = new ModelAndView();        
        StudentModel studentModel = new StudentModel();
        if("update".equals(otype)){
            for (StudentModel model : studentList) {
                if(model.getId() == id){
                    studentModel = model;
                    break;
                }
            }
        }
        mav.addObject("studentModel", studentModel);
        mav.setViewName("student/StudentUpdate");        
        return mav;
    }
    
    @RequestMapping("/Save")
    public String Save(StudentModel studentModel){
        if(studentModel.getId() == 0){
            this.id++;
            studentModel.setId(this.id);
        }else{
            for (StudentModel model : studentList) {
                if(id == model.getId()){
                    studentList.remove(model);
                    break;
                }
            }
            studentModel.setId(id);
        }
        studentList.add(studentModel);
　　　　 //重定向
        return "redirect:/student/studentList.do";
    }
}

SpringMVC中的一些註解