Question

控制器方法：

@RequestMapping(value = "channelIntentionDetails.html", method = RequestMethod.POST)
  public @ResponseBody
  Report getChannelIntentionDetails(@RequestBody SearchParameters searchParameters) {
    LOGGER.info("In ReportController.getChannelIntentionDetails(...), searchParameters " + searchParameters);

    return channelDetailsService.getIntentionDetails(searchParameters);
  }

报告POJO：

public class Report {

  private Map<String, Collection<String>> parameterWiseResult;
  private Collection<String>              results;
  private String                          result;
  private String                          spid;
.
.
.
}

结果集合包含从MongoDB集合返回的JSON字符串

JS AJAX片段：

    var xmlhttp = new XMLHttpRequest();
    xmlhttp.open("POST","channelIntentionDetails.html",false);
    xmlhttp.setRequestHeader("Content-Type","application/json");
    xmlhttp.setRequestHeader("Accept","application/json");
    xmlhttp.send(stringifiedSearchParameter);

    alert("Plain AJAX response "+ xmlhttp.response);
    alert("After JSON.parse(...) "+ (JSON.parse(xmlhttp.response)).results);

drawIntentionPieChart((JSON.parse(xmlhttp.response)).results);

function drawIntentionPieChart(data) {

        //alert("In drawIntentionPieChart(...) " + intentionGooglePieChart);

        if (intentionGooglePieChart == null
                || intentionGooglePieChart == 'undefined') {
            //alert("Creating new intentionPiechart");
            intentionGooglePieChart = new google.visualization.PieChart(
                    document.getElementById('intentionPiechart'));
        }

        intentionGooglePieChart.clearChart();

        //var jsonData = JSON.parse(data);
        var jsonData = data;

        var data = new google.visualization.DataTable();
        data.addColumn('string', 'Intention');
        data.addColumn('number', 'Share');

        for (i = 0; i < jsonData.length; i++) {

            /* alert("Intention : " + jsonData[i]._id.Intention_category
                    + " Count : " + jsonData[i].count); */

            data.addRows([ [ jsonData[i]._id.Intention_category,
                    parseInt(jsonData[i].count) ] ]);

        }

        var options = {
            title : 'Intention Analysis',
            titleTextStyle : {
                color : '#0E5EAE'
            },
            fontSize : 14,
            width : 390,
            height : 200

        };

        intentionGooglePieChart.draw(data, options);
    }

第一次提醒，其中“results”是一个数组

Plain AJAX response {"parameterWiseResult":null,"results":["{ \"_id\" : { \"SpId\" : 352 , \"Intention_category\" : \"Opine\" , \"Report_Id\" : 2 , \"Channel_Id\" : 1} , \"count\" : 1}","{ \"_id\" : { \"SpId\" : 352 , \"Intention_category\" : \"Wish,Purchase\" , \"Report_Id\" : 2 , \"Channel_Id\" : 1} , \"count\" : 1}","{ \"_id\" : { \"SpId\" : 352 , \"Intention_category\" : \"Complain\" , \"Report_Id\" : 2 , \"Channel_Id\" : 1} , \"count\" : 1}","{ \"_id\" : { \"SpId\" : 352 , \"Intention_category\" : \"Purchase\" , \"Report_Id\" : 2 , \"Channel_Id\" : 1} , \"count\" : 2}","{ \"_id\" : { \"SpId\" : 352 , \"Intention_category\" : \"None\" , \"Report_Id\" : 2 , \"Channel_Id\" : 1} , \"count\" : 93}"],"result":null,"spid":null,"idvallistsearchprofile":null,"idvallisttags":null,"spmaster":null,"competitiveParameters":null}

第二个警告在JSON.parse（...）之后，数组括起来。 []不见了：

After JSON.parse(...) { "_id" : { "SpId" : 352 , "Intention_category" : "Opine" , "Report_Id" : 2 , "Channel_Id" : 1} , "count" : 1},{ "_id" : { "SpId" : 352 , "Intention_category" : "Wish,Purchase" , "Report_Id" : 2 , "Channel_Id" : 1} , "count" : 1},{ "_id" : { "SpId" : 352 , "Intention_category" : "Complain" , "Report_Id" : 2 , "Channel_Id" : 1} , "count" : 1},{ "_id" : { "SpId" : 352 , "Intention_category" : "Purchase" , "Report_Id" : 2 , "Channel_Id" : 1} , "count" : 2},{ "_id" : { "SpId" : 352 , "Intention_category" : "None" , "Report_Id" : 2 , "Channel_Id" : 1} , "count" : 93}

稍后，当我尝试迭代此解析结果时，我收到错误。

TypeError：jsonData [i] ._ id未定义

data.addRows([ [ jsonData[i]._id.Intention_category,
parseInt(jsonData[i].count) ] ]);

我在哪里弄乱？

Answer 1

有两种解决方案可以解决您的问题。

选项1：更改从服务返回的数据格式

如果您想从Web服务返回对象的集合/数组，您的POGO应如下所示。

public class Report {

    private Map<String, Collection<String>> parameterWiseResult;
    private Collection<MyObject>            results;
    private String                          result;
    private String                          spid;

    //Setters and Getters
}

public class MyObject {

    private Id _id;
    private int count;

    //Setters and Getters

    private class Id {
         int SpId;
         String Intention_category;
         int Report_Id;
         int Channel_Id;

         //Setters and Getters 
    }
}

选项2：双解析字符串以在Javascript中将内部String转换为Object。在for循环中，您需要将数组的每个元素解析为JSON，如下所示：

var myJson = JSON.parse(jsonData[i]);
data.addRows([ [ myJson._id.Intention_category, parseInt(myJson.count) ] ]);

JSON.parse（...）后输出不正确

1 个答案: