前后端分离上传歌手信息提示空指针

Question

本人在做前后端分离的音乐网页中，尝试在管理页中添加新歌手时提示了空指针异常，请问要怎么解决

    @ResponseBody
    @RequestMapping(value = "/add",method = RequestMethod.POST)
    public JSONObject addSinger(HttpServletRequest request){
        JSONObject jsonObject = new JSONObject();
        String name = request.getParameter("name").trim();
        String sex = request.getParameter("sex").trim();
        String pic = request.getParameter("pic").trim();
        String birthday = request.getParameter("birthday").trim();
        String location = request.getParameter("location").trim();
        String introductionParam = request.getParameter("introduction");
        System.out.println("Introduction parameter value: " + introductionParam);
        String introduction = (introductionParam != null) ? introductionParam.trim() : "";
        System.out.println("Introduction after trim: " + introduction);
        //将生日转换为Date格式
        Singer singer = new Singer();
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        Date birthDate = new Date();
        try {
            birthDate = dateFormat.parse(birthday);
        }catch (Exception e){
            e.printStackTrace();
        }

        singer.setName(name);
        singer.setSex(new Byte(sex));
        singer.setPic(pic);
        singer.setBirthday(birthDate);
        singer.setLocation(location);
        singer.setIntroduction(introduction);
        boolean res = singerService.insert(singer);
        if(res){
            jsonObject.put(Consts.CODE,1);
            jsonObject.put(Consts.MSG,"添加成功");
            return jsonObject;
        }else{
            jsonObject.put(Consts.CODE, 0);
            jsonObject.put(Consts.MSG,"添加失败");
            return jsonObject;
        }
    }

2023-11-23 16:17:02.580 ERROR 2360 --- [nio-8888-exec-5] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause

java.lang.NullPointerException: null
    at com.javassm.music.controller.SingerController.addSinger(SingerController.java:33) ~[classes/:na]
33为String name = request.getParameter("name").trim();

        addSinger(){
            let d = this.registerForm.birthday;
            let datetime = d.getFullYear() + '-' + (d.getMonth() + 1) + '-' + d.getDate();
            let params = new URLSearchParams();
            params.append('name',this.registerForm.name);
            params.append('sex',this.registerForm.sex);
            params.append('pic','/img/singerPic/abc.jpg');
            params.append('birthday',datetime);
            params.append('location',this.registerForm.location);
            params.append('introduction',this.registerForm.introduction);

            setSinger({params})
            .then(res => {
                if(res.code == 1){
                    this.getData()
                    this.registerForm = {}
                    this.notify("添加成功","success")
                }else{
                    this.notify("添加失败","error")
                }
            })
            .catch(err =>{
                console.log(err);
            });
            this.centerDialogVisible=false;
        },

api中所调用的方法
export const setSinger = (params) => post('singer/add', params);

若需要更多代码我可以提供，或者远程控制也行

Answer 1

request.getParameter("name")

获取name属性值时结果为空，导致调用trim方法报空指针。