Java org.springframework.web.bind.MissingServletRequestParameterException

在向服务器端发送呼叫时遇到问题

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)

Javascript调用

controller.js

$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();
        },

java中服务控制器中的映射：

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

    getAnswerDAC().addCorrectAnswer(answerId, correct);

}

---

@RequestParam有一个属性

required

，默认为true。如果不需要answerId，请按如下所示更改注释和参数类型

@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：因为answerId在您的示例中是一个基本值，所以您还需要在注释中提供一个defaultValue。提供一个defaultValue隐式地将required设置为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);
}

---

希望这有帮助

@RequestParam有一个属性

required

，默认情况下该属性为true。如果不需要answerId，请按如下所示更改注释和参数类型

@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：因为answerId在您的示例中是一个基本值，所以您还需要在注释中提供一个defaultValue。提供一个defaultValue隐式地将required设置为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);
}

---

希望这对您有所帮助

在AJAX调用之前，answerIdVal的值是多少？您是否可以使用客户端调试器（如firebug）来查看该值是否已提交？另一种调试方法是通过删除

@RequestParam

来更改方法签名，并获取

HttpServletRequest

，查看参数是否存在于

请求中。getParameterMap（）

。在AJAX调用之前，answerIdVal的值是多少？您是否可以使用客户端调试器（如firebug）来查看该值是否已提交？另一种调试方法是通过删除

@RequestParam

来更改方法签名，并获取

HttpServletRequest

，查看该参数是否存在于

request.getParameterMap（）

中。