SpringMVC @RequestBody接收Json對象字符串

之前，一直覺得在SpringMVC環境中，@RequestBody接收的是一個Json對象，一直在調試代碼都沒有成功，後來發現，其實 @RequestBody接收的是一個Json對象的字符串，而不是一個Json對象。然而在ajax請求每每傳的都是Json對象，後來發現用 JSON.stringify(data)的方式就能將對象變成字符串。同時ajax請求的時候也要指定dataType: "json",contentType:"application/json" 這樣就能夠輕易的將一個對象或者List傳到Java端，使用@RequestBody便可綁定對象或者List.

JavaScript 代碼：

<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代碼

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

使用API工具調用方法：

json數據

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

java代碼

　　 @PostMapping("/check_version")
    @ApiOperation(value = "檢測app版本信息", notes = "檢測app版本信息")
    public ResponseEntity<JsonResponseVM<DetectVersionResponseVM>> detectVersion(@Validated @RequestBody DetectVersionRequestVM requestVM) {
        log.info("檢測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);
    }

用於接收的對象，能夠自定義校驗規範

@ApiModel
public class DetectVersionRequestVM {
    @Size(max = 20, message = "手機app版本號長度不能大於20")
    @ApiModelProperty(dataType = "java.lang.String", value = "版本號")
    private String versionNumbern;

    @Pattern(regexp = "(ios|android)")
    @Size(max = 20, message = "渠道長度不能大於20")
    @NotEmpty(message = "渠道號不能爲空")
    @ApiModelProperty(dataType = "java.lang.String", value = "類型: ios、android", example = "ios")
    private String channel;

    //get  set

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