SpringMVC @RequestBody接收Json对象字符串

之前，一直觉得在SpringMVC环境中，@RequestBody接收的是一个Json对象，一直在调试代码都没有成功，后来发现，其实 @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请求每每传的都是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" 这样就能够轻易的将一个对象或者List传到Java端，使用@RequestBody便可绑定对象或者List.

JavaScript 代码：

<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> 

Java代码

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

使用API工具调用方法：

json数据

{"versionNumbern":"1.0","channel":"ios"}

java代码

　　 @PostMapping("/check_version")
    @ApiOperation(value = "检测app版本信息", notes = "检测app版本信息")
    public ResponseEntity<JsonResponseVM<DetectVersionResponseVM>> detectVersion(@Validated @RequestBody DetectVersionRequestVM requestVM) {
        log.info("检测app版本信息: {}", JSON.toJSONString(requestVM));
        DetectVersionResponseVM responseVM = appService.detectVersion(requestVM);
        if (responseVM == null) {
            return ResponseEntity.ok(new JsonResponseVM(new ErrorVM(ErrorConstants.ERR_VERSION_VAILD_FAIL_CODE, ErrorConstants.ERR_VERSION_VAILD_FAIL, Constants.RETCODE_FAIL)));
        }
        if (requestVM.getChannel().equals(Constants.CHANNEL_IOS)) {
            responseVM.setDownloadUrl(hxjInitConfig.getIosDownloadUrl());
        }
        return new ResponseEntity<JsonResponseVM<DetectVersionResponseVM>>(new JsonResponseVM(new ErrorVM(Constants.RETCODE_SUCCEED), responseVM), HttpStatus.OK);
    }

用于接收的对象，能够自定义校验规范

@ApiModel
public class DetectVersionRequestVM {
    @Size(max = 20, message = "手机app版本号长度不能大于20")
    @ApiModelProperty(dataType = "java.lang.String", value = "版本号")
    private String versionNumbern;

    @Pattern(regexp = "(ios|android)")
    @Size(max = 20, message = "渠道长度不能大于20")
    @NotEmpty(message = "渠道号不能为空")
    @ApiModelProperty(dataType = "java.lang.String", value = "类型: ios、android", example = "ios")
    private String channel;

    //get  set

    @Override
    public String toString() {
        return "DetectVersionRequestVM{" +
                "versionNumbern='" + versionNumbern + '\'' +
                ", channel='" + channel + '\'' +
                '}';
    }
}