Spring MVC中不存在必需的String参数错误

时间:2013-10-27 14:21:43

标签: java ajax spring spring-mvc

我尝试在Spring MVC中向我的控制器发出一个AJAX查询。

我的操作代码是:

@RequestMapping(value = "events/add", method = RequestMethod.POST)
public void addEvent(@RequestParam(value = "start_date") String start_date, @RequestParam(value = "end_date") String end_date, @RequestParam(value = "text") String text, @RequestParam(value = "userId") String userId){
    //some code    
}

我的Ajax查询是:

$.ajax({
        type: "POST",
        url:url,
        contentType: "application/json",
        data:     {
                start_date:   scheduler.getEvent(id).start_date,
                end_date:  scheduler.getEvent(id).end_date,
                text: scheduler.getEvent(id).text,
                userId: userId
        },
        success:function(result){
         //here some code
        }
    });

但我收到了一个错误:

  

必需的字符串参数''start_date不存在

为什么呢? 据我所知,我将其呈现为(@RequestParam(value = "start_date") String start_date

UDP
现在我给404 我班上的数据

public class EventData {
    public String end_date;
    public String start_date;
    public String text;
    public String userId;
    //Getters and setters
}

我的js AJAX调用是:

$.ajax({
    type: "POST",
    url:url,
    contentType: "application/json",
    // data: eventData,
    processData: false,
    data:    JSON.stringify({
        "start_date":   scheduler.getEventStartDate(id),
        "end_date":  scheduler.getEventEndDate(id),
        "text": scheduler.getEventText(id),
        "userId": "1"
    }),

控制器动作:

@RequestMapping(value = "events/add", method = RequestMethod.POST)
public void addEvent(@RequestBody EventData eventData){    
}

JSON数据是:

end_date: "2013-10-03T20:05:00.000Z"
start_date: "2013-10-03T20:00:00.000Z"
text: "gfsgsdgs"
userId: "1"

3 个答案:

答案 0 :(得分:37)

在服务器端,您希望您的请求参数作为查询字符串,但在客户端,您发送一个json对象。要绑定json,您需要创建一个包含所有参数的类,并使用@RequestBody注释而不是@RequestParam。

@RequestMapping(value = "events/add", method = RequestMethod.POST)
public void addEvent(@RequestBody CommandBean commandBean){
    //some code
}

Here is更详细的解释。

答案 1 :(得分:0)

我有同样的问题..我通过在post请求中指定config params来解决它:

var config = {
    transformRequest : angular.identity,
    headers: { "Content-Type": undefined }
}

$http.post('/getAllData', inputData, *config*).success(function(data,status) {
    $scope.loader.loading = false;
})

config 是我包含的参数,它开始工作.. 希望它有所帮助:)

答案 2 :(得分:0)

Spring引导代码

@RequestMapping(value = "events/add", method = RequestMethod.POST)
public void addEvent(@RequestParam(value = "start_date") String start_date, @RequestParam(value = "end_date") String end_date, @RequestParam(value = "text") String text, @RequestParam(value = "userId") String userId){
    //some code    
}

要发送的邮递员请求链接:使用邮递员中的Parmas添加参数和值,并查看以下请求链接。

http://localhost:8080/events/add?start_date=*someValue*&end_date=*someValue*&text=*someValue*&userId=*someValue*