Spring拦截器获取request请求体中的json数据，并转换成Java对象的解决办法

@ResourceprivateUserServiceuserService;
/*** 更新用户信息** @param request* @param userInfo* @return*/@RequestMapping(value="/updateUserInfo", produces="application/json;charset=UTF-8",
method=RequestMethod.POST)
publicJSONObjectupdateUserInfo(HttpServletRequestrequest, @RequestBodyUserInfouserInfo) {
   ...
userService.updateUserInfo(userInfo);  
    ...
}

@OverridepublicbooleanpreHandle(HttpServletRequestrequest, HttpServletResponseresponse, Objecto) {
   ......
// user ID为string类型，所以可以直接拿到数据，// 但是如果参数是对象类型/JSON类型数据，则无法通过这种方式获取！StringuserId=request.getParameter("userId");
   .....
}

classRequestWrapperextendsHttpServletRequestWrapper {

/*** 拦截器: ** @author csp* @date 2022-01-06 15:36:41*/publicclassUserInterceptorimplementsHandlerInterceptor {
privatefinalstaticLoggerlogger=LoggerFactory.getLogger(UserInterceptor.class);
@ResourceprivateUserServiceuserService;
/*** 前置拦截** @param request* @param response* @param o* @return* @throws Exception*/@OverridepublicbooleanpreHandle(HttpServletRequestrequest, HttpServletResponseresponse, Objecto) throwsException {
// 从request请求体中拿到body中的JSON对象参数RequestWrapperrequestWrapper=newRequestWrapper(request);
StringjsonBody=requestWrapper.getBody();
UserInfouserInfo=JSONObject.toJavaObject(JSONObject.parseObject(jsonBody), UserInfo.class);
// 根据userInfo校验是否具备权限BooleanisAuth=userService.getAuthByUserInfo(userInfo);
if (!isAuth) {
// response响应给浏览器无权限,代码略           ...
returnfalse;
        }
returntrue;
    }
@OverridepublicvoidpostHandle(HttpServletRequestrequest, HttpServletResponseresponse, Objecto, ModelAndViewmodelAndView) throwsException {}
@OverridepublicvoidafterCompletion(HttpServletRequestrequest, HttpServletResponseresponse, Objecto, Exceptione) throwsException {}
// RequestWrapper 内部类classRequestWrapperextendsHttpServletRequestWrapper {
privatefinalStringbody;
publicRequestWrapper(HttpServletRequestrequest) {
super(request);
StringBuilderstringBuilder=newStringBuilder();
BufferedReaderbufferedReader=null;
InputStreaminputStream=null;
try {
inputStream=request.getInputStream();
if (inputStream!=null) {
bufferedReader=newBufferedReader(newInputStreamReader(inputStream));
char[] charBuffer=newchar[128];
intbytesRead=-1;
while ((bytesRead=bufferedReader.read(charBuffer)) >0) {
stringBuilder.append(charBuffer, 0, bytesRead);
                    }
                } else {
stringBuilder.append("");
                }
            } catch (IOExceptionex) {
            } finally {
if (inputStream!=null) {
try {
inputStream.close();
                    } catch (IOExceptione) {
e.printStackTrace();
                    }
                }
if (bufferedReader!=null) {
try {
bufferedReader.close();
                    } catch (IOExceptione) {
e.printStackTrace();
                    }
                }
            }
body=stringBuilder.toString();
        }
@OverridepublicServletInputStreamgetInputStream() throwsIOException {
finalByteArrayInputStreambyteArrayInputStream=newByteArrayInputStream(body.getBytes());
ServletInputStreamservletInputStream=newServletInputStream() {
@OverridepublicbooleanisFinished() {
returnfalse;
                }
@OverridepublicbooleanisReady() {
returnfalse;
                }
@OverridepublicvoidsetReadListener(ReadListenerreadListener) {
                }
@Overridepublicintread() throwsIOException {
returnbyteArrayInputStream.read();
                }
            };
returnservletInputStream;
        }
@OverridepublicBufferedReadergetReader() throwsIOException {
returnnewBufferedReader(newInputStreamReader(this.getInputStream()));
        }
publicStringgetBody() {
returnthis.body;
        }
    }
}