0

我有一个javascript数组，我用元素填充数组结构是：

 var citizens1 = [{"startLat":null,"startLng":null,"socialSecurityNumber":null}];

数组获取数据但是我需要将此数据推送到服务器进行处理。该数组包含500 条记录。我没有向服务器发出 500 个Web 服务请求，而是将数组数据转换为JSON字符串，并将所有数据传递到服务器，在服务器上我一次处理所有记录，从而进行一次ajax 调用。

我不确定我是否将数据正确传递到服务器。我遇到错误。下面是我的代码：

Javascript

 citizens1.push({startLat:marker[index].getPosition().lat(),startLng:marker[index].getPosition().lng(),socialSecurityNumber:global_citizens[index].socialSecurityNumber});

 if(citizens1.length == 500){            
     console.log('500 records saved');          
     window.clearTimeout( timerHandle);

     for(var i = 0; i < citizens1.length ; i++){
        var myJsonString = JSON.stringify(citizens1);
        //console.log(myJsonString);

         //console.log(citizens1[i].lat +',' +citizens1[i].lng+','+citizens1[i].socialSecurityNumber); 
        $.ajax({
                type:'POST',
                url:'logMovement.htm',
                contentType: "application/json; charset=utf-8",
                async: false,
                cache: false, 
                data:myJsonString,
                dataType: 'json',
                success:function(data){

                    if (data == false){
                        console.log('error occured in logging data');
                    }

                }

            });          

     }

     citizens1 = [];
 }

控制器

 @RequestMapping(value="logMovement.htm", method={RequestMethod.POST},produces = "application/json; charset=utf-8")
     public @ResponseBody Movement logMovement(@RequestBody Movement movement)throws Exception{

         logger.info("About to log movement");

         JSONObject jsonObj = JSONObject.fromObject(movement);
         ObjectMapper mapper = new ObjectMapper();

         List<Movement> move = mapper.readValue(jsonObj.toString(), new TypeReference<Movement>(){});

        logger.info(move);
        return null;

         /*if((!lat.equals(null)) || (!(lat == null)) || (!(lat.length() == 0))){
             double dLat = Double.parseDouble(lat);
             double dLng = Double.parseDouble(lng);
             int iSocialSecurityNumber = Integer.parseInt(socialSecurityNumber);

             this.markerManager.logMovement(dLat, dLng, iSocialSecurityNumber);

         }*/


     }

运动类

public class Movement implements Serializable{

    private List<Integer>socialSecurityNumber;
    private List<Double> startLat;
    private List<Double> startLng;
    /**
     * @param socialSecurityNumber
     * @param startLat
     * @param startLng
     */

    public Movement(){}

    public Movement(List<Integer> socialSecurityNumber, List<Double> startLat,
            List<Double> startLng) {
        super();
        this.socialSecurityNumber = socialSecurityNumber;
        this.startLat = startLat;
        this.startLng = startLng;
    }
//getters and setters

发布到服务器的 Json 数据示例

我看到第一行是“空”我不确定这是否导致问题

[{"startLat":null,"startLng":null,"socialSecurityNumber":null},{"startLat":10.537749449700717,"startLng":-61.44420048947677,"socialSecurityNumber":198501012},{"startLat":10.537208514171011," startLng":-61.443589321013235,"socialSecurityNumber":198501012},{"startLat":10.536667622323245,"startLng":-61.44297811322531,"socialSecurityNumber":198501012},{"startLat":10.536131483465244,"startLng":-61.442362603115384,"socialSecurityNumber ":198501012},{"startLat":10.53566878133931,"startLng":-61.44168979108997,"socialSecurityNumber":198501012},{"startLat":10.535227295591238,"startLng":-61.44010009433986862"startLat":10.170058041417015,"startLng":-61.67893982108137,"socialSecurityNumber":194302025}

错误

我正在查看这个SO question，它处理了jQuery Datatables 中不存在必需的 JSON 参数的问题

org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Can not deserialize instance of com.crimetrack.business.Movement out of START_ARRAY token 

org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Can not deserialize instance of com.crimetrack.business.Movement out of START_ARRAY token
 at [Source: org.apache.catalina.connector.CoyoteInputStream@72f1db9d; line: 1, column: 1]; nested exception is org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of com.crimetrack.business.Movement out of START_ARRAY token
 at [Source: org.apache.catalina.connector.CoyoteInputStream@72f1db9d; line: 1, column: 1]
    at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.readInternal(MappingJacksonHttpMessageConverter.java:127)
    at org.springframework.http.converter.AbstractHttpMessageConverter.read(AbstractHttpMessageConverter.java:153)
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:120)
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:91)
    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:71)
    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:75)
    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:156)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:117)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1008)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of com.crimetrack.business.Movement out of START_ARRAY token
 at [Source: org.apache.catalina.connector.CoyoteInputStream@72f1db9d; line: 1, column: 1]
    at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java:159)
    at org.codehaus.jackson.map.deser.StdDeserializationContext.mappingException(StdDeserializationContext.java:131)
    at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeUsingCreator(BeanDeserializer.java:397)
    at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:296)
    at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:1282)
    at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:941)
    at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.readInternal(MappingJacksonHttpMessageConverter.java:124)
    ... 33 more
4

3 回答 3

2

Your JSON is invalid, the values on the left hand side of the colon need to be Strings.

[
    {
        "lat": null,
        "lng": null,
        "socialSecurityNumber": null
    }
]

Also, you appear to be using the wrong annotation, @RequestBody is used to parse the contents of the JSON rather than @RequestParam which is used to get variables from a paramter like

?var=1&newvar=2

Also, in your javascript, change data:{'myData':myJsonString } to just data:myJsonString,

You should make a dumb object to populate, check out this tutorial at the bottom of the page where they populate a dumb Person object hmkcode.com/spring-mvc-json-json-to-java

于 2013-10-14T14:51:32.627 回答
0

您可以像这样在控制器中编写响应

希望这“会有所帮助

    //get "hie" string from the service class, String is in JSON format
    String hie = svc.getHierarchysvc();

    response.setContentType("application/json");

    PrintWriter out = response.getWriter();
    out.write(hie);
于 2013-10-15T03:45:24.103 回答
0

我对运动类和控制器进行了一些调整，这为我提供了解决方案。下面是那些可能有兴趣解决此错误的代码：

运动.java

拥有默认构造函数非常重要。如果不存在，json 将抛出与application/json 相关的错误；charset=utf-8不支持 http 415 不支持的媒体。

public class Movement implements Serializable{

    private int socialSecurityNumber;
    private double startLat;
    private double startLng;
    /**
     * @param socialSecurityNumber
     * @param startLat
     * @param startLng
     */

    public Movement(){}
    /**
     * @param socialSecurityNumber
     * @param startLat
     * @param startLng
     */
    public Movement(int socialSecurityNumber, double startLat, double startLng) {
        super();
        this.socialSecurityNumber = socialSecurityNumber;
        this.startLat = startLat;
        this.startLng = startLng;
    }
//getters and setters

控制器

由于它是一个数据数组，因此定义@RequestBody使用List很重要。此外，声明JSONArray对于保存列表也很重要。完成后，您可以根据其类型“获取”数据。下面是代码。

@RequestMapping(value="logMovement.htm", method = {RequestMethod.POST},consumes = "application/json")
     public @ResponseBody Movement logMovement(@RequestBody List<Movement> movement)throws Exception{

         logger.info("About to log movement");

         JSONArray nameArray =(JSONArray) JSONSerializer.toJSON(movement);

         System.out.println(nameArray.size());

          for(Object js : nameArray){
              JSONObject json = (JSONObject)js;
              //System.out.println(json.get("socialSecurityNumber"));
              if((!json.get("startLat").equals(null))){     

                     this.markerManager.logMovement(json.getDouble("startLat"),json.getDouble("startLng"), json.getInt("socialSecurityNumber"));

                }
          }


        return null;    

     }
于 2013-10-15T14:59:09.673 回答