Springmvc简单的修改删除表格

package com.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.ke.model.Student; @Controller @RequestMapping("student") //用来区分模块 public class StudentController { private static List studentlist=new ArrayList<Student>(); static{ studentlist.add(new Student(1,"张三",23)); studentlist.add(new Student(2,"李四",22)); studentlist.add(new Student(3,"娃娃",21)); } @RequestMapping("/list") public ModelAndView list(){ ModelAndView mav=new ModelAndView(); mav.addObject("studentlist",studentlist);//添加 mav.setViewName("student/list"); return mav; } @RequestMapping("/preSave") public ModelAndView preSave(@RequestParam(value="id",required=false) String id){ //传递参数注解,默认为true 改成false是为了不报获取不到参数的错， //默认是必须要参数，获取不到就会报错，false为不需要 ModelAndView mav=new ModelAndView(); //System.out.println(id); if(id != null){ mav.addObject("student",studentlist.get(Integer.parseInt(id)-1));//因为是索引 所以减去一 mav.setViewName("student/update"); }else{ mav.setViewName("student/add"); } return mav; } @RequestMapping("/save") public String save(Student student){ if(student.getId()!=0){ Student s=(Student) studentlist.get(student.getId()-1); s.setName(student.getName()); s.setAge(student.getAge()); }else{ studentlist.add(student); } //return "redirect:/student/list.do"; return "forward:/student/list.do"; } @RequestMapping("/delete") public String delete(@RequestParam("id") int id){ studentlist.remove(id-1); return "redirect:/student/list.do"; } }