SpringMVC將JSON數據發送到服務器（java）

Question

我有一個javascript數組，我填充數組結構的元素：

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

數組獲取數據，但我需要將此數據推送到服務器進行處理。 該陣列擁有500條記錄 。 而不是向服務器發出500 Web服務請求我將數組數據轉換為JSON字符串並將所有數據傳遞到服務器，我立即處理所有記錄，從而進行一次ajax調用 。

我不確定我是否正確地將數據傳遞給服務器。 我遇到了錯誤。 下面是我的代碼：

使用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 = [];
 }

調節器

 @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);

         }*/


     }

運動課

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

發布到服務器的Json數據示例

我看到第一行是'null'我不確定這是否導致問題

[{ “startLat”：NULL， “startLng”：NULL， “socialSecurityNumber的” 日期null}，{ “startLat”：10.537749449700717 “startLng”： - 61.44420048947677， “socialSecurityNumber的”：198501012}，{ “startLat”：10.537208514171011” startLng “： - 61.443589321013235” socialSecurityNumber的 “：198501012}，{” startLat “：10.536667622323245” startLng “： - 61.44297811322531，” socialSecurityNumber的 “：198501012}，{” startLat “：10.536131483465244” startLng “： - 61.442362603115384” socialSecurityNumber的“：198501012}，{” startLat “：10.53566878133931，” startLng “： - 61.44168979108997，” socialSecurityNumber的 “：198501012}，{” startLat “：10.535227295591238” startLng “： - 61.441000943386825” socialSecurityNumber的 “：198501012}，{” startLat “：10.170058041417015，” startLng “： - 61.67893982108137，” socialSecurityNumber的“：194302025}

錯誤

我看着這太問題，其處理這個問題必需的JSON參數不存在在jQuery的數據表

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

Answer 1

您的JSON無效，冒號左側的值必須是字符串。

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

此外，您似乎使用了錯誤的注釋，@ @RequestBody用於解析JSON的內容而不是@RequestParam ，用於從參數中獲取變量

?var=1&newvar=2

此外，在您的javascript中， change data:{'myData':myJsonString }更改為data:myJsonString,

你應該制作一個愚蠢的對象來填充，在頁面底部查看這個教程，它們填充一個愚蠢的Person對象hmkcode.com/spring-mvc-json-json-to-java

Answer 2

你可以像這樣在控制器中寫響應

希望這會“有所幫助

    //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);

Answer 3

我對機芯類和控制器進行了一些調整，這為我提供了解決方案。 Under是可能有興趣解決此錯誤的人的代碼：

Movement.java

擁有默認構造函數非常重要。 如果這不存在，json將拋出與application / json相關的錯誤; charset = utf-8不支持http 415不支持的媒體。

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

調節器

由於它是一個數據數組，因此定義@RequestBody以使用List非常重要。 同時聲明JSONArray對於保存列表很重要。 完成后，您可以根據其類型“獲取”數據。 下面是代碼。

@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;    

     }