java - org.springframework.web.bind.MissingServletRequestParameterException异常

Question

向服务器端发送调用时遇到问题

异常堆栈跟踪:

"org.springframework.web.bind.MissingServletRequestParameterException: Required int parameter 'answerId' is not present\r\n\tat org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.raiseMissingParameterException(AnnotationMethodHandlerAdapter.java:773)\r\n\tat org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveRequestParam(HandlerMethodInvoker.java:509)

controller.js 中的 Javascript 调用

$scope.saveCorrectAnswer = function(answerId) {

        var answerIdVal = 0;
        answerIdVal = answerId;
        if(document.getElementById(answerId).className == 'ico-white-check') {
            $scope.answer.correct = 'Y';
        } else{
            $scope.answer.correct = 'N';
        }

        Answer.update({answerId: answerIdVal, correct: $scope.answer.correct}, function(response) {
            // On success go to Exchange
            //$route.reload();
        },

在java服务 Controller 中的映射:

@RequestMapping(method = RequestMethod.PUT, consumes = "application/json", produces = "application/json")
@ResponseBody
public void addCorrectAnswer(@RequestParam int answerId, @RequestParam String correct) {

    getAnswerDAC().addCorrectAnswer(answerId, correct);

}

Answer 1

@RequestParam 有一个属性required，默认为真。如果不需要answerId，修改注解和参数类型如下...

@RequestMapping(method = RequestMethod.PUT, consumes = "application/json", produces = "application/json")
@ResponseBody
public void addCorrectAnswer(@RequestParam(required = false) Integer answerId, @RequestParam String correct) {
     getAnswerDAC().addCorrectAnswer(answerId, correct);
}

编辑:由于 answerId 在您的示例中是一个原始值，因此您还需要在注释中提供一个 defaultValue。提供 defaultValue 隐式设置 required 为 false，所以我将把它排除在示例之外......

@RequestMapping(method = RequestMethod.PUT, consumes = "application/json", produces = "application/json")
@ResponseBody
public void addCorrectAnswer(@RequestParam(defaultValue = 0) int answerId, @RequestParam String correct) {
     getAnswerDAC().addCorrectAnswer(answerId, correct);
}

希望对你有帮助