SpringMVC接收json对象

SpringMVC接收json对象

前端传的数据是json数据，后端如何接收呢？

1、以RequestParam接收

前端传来的是json数据不多时：[id:id],可以直接用@RequestParam来获取值

@Autowired
private AccomodationService accomodationService;

@RequestMapping(value = "/update")
@ResponseBody
public String updateAttr(@RequestParam ("id") int id) {
    int res=accomodationService.deleteData(id);
    return "success";
}

2、以实体类方式接收

前端传来的是一个json对象时：{【id，name】},可以用实体类直接进行自动绑定

@Autowired
private AccomodationService accomodationService;

@RequestMapping(value = "/add")
@ResponseBody
public String addObj(@RequestBody Accomodation accomodation) {
    this.accomodationService.insert(accomodation);
    return "success";
    }
}

3、以Map接收

前端传来的是一个json对象时：{【id，name】},可以用Map来获取

@Autowired
private AccomodationService accomodationService;

@RequestMapping(value = "/update")
@ResponseBody
public String updateAttr(@RequestBody Map<String, String> map) {
    if(map.containsKey("id"){
        Integer id = Integer.parseInt(map.get("id"));
    }
    if(map.containsKey("name"){
        String objname = map.get("name").toString();
    }
    // 操作 ...
    return "success";
}

4、以List接收

当前端传来这样一个json数组：[{id,name},{id,name},{id,name},...]时，用List接收

需要注意点：参数前面必须有注解 @RequestBody

@Autowired
private AccomodationService accomodationService;

@RequestMapping(value = "/update")
@ResponseBody
public String updateAttr(@RequestBody List<Accomodation> list) {
    for(Accomodation accomodation:list){
        System.out.println(accomodation.toString());
    }
    return "success";
}