SpringMVC的RequestBody注解

RequestBody的用法

@RequestBody接收的是一个Json对象的字符串，而不是一个Json对象。然而在ajax请求往往传的都是Json对象，后来发现用 JSON.stringify(data)的方式就能将对象变成字符串。同时ajax请求的时候也要指定dataType: "json",contentType:"application/json" 这样就可以轻易的将一个对象或者List传到Java端，使用@RequestBody即可绑定对象或者List.

• js写法

<script type="text/javascript"> 
    $(document).ready(function(){ 
        var saveDataAry=[]; 
        var data1={"userName":"test","address":"gz"}; 
        var data2={"userName":"ququ","address":"gr"}; 
        saveDataAry.push(data1); 
        saveDataAry.push(data2);        
        $.ajax({
            type:"POST",
            url:"user/saveUser",
            dataType:"json",     
            contentType:"application/json",              
            data:JSON.stringify(saveData),
            success:function(data){
            }
         });
    }); 
</script>

• spring写法

@RequestMapping(value = "saveUser", method = {RequestMethod.POST }})
    @ResponseBody 
    public void saveUser(@RequestBody List<User> users) {
         userService.batchSave(users);
    } 

RequestBody的支持

• RequestMappingHandlerAdapter

• RequestResponseBodyMethodProcessor

• AbstractMessageConverterMethodArgumentResolver

• HttpMessageConverter

• MappingJackson2HttpMessageConverter