Question

这是我的问题：

我有一个从我的Web服务返回的Java字符串，格式如下：

21,6.417,0.3055714,27,0.7778,0.04761905
现在我已经使用逗号分隔符的split函数将此字符串拆分为单独的字符串。

dataList = Arrays.asList（data.split（“，”））;

我需要遍历此列表并将这些值分配到单独的字符串中，如下所示：

int playsCount = Integer.parseInt(dataList.get(0));
float sumTimeViewed = Float.valueOf(dataList.get(1));
float avgTimeViewed = Float.valueOf(dataList.get(2));
int loadsCount = Integer.parseInt(dataList.get(3));
float loadPlayRatio = Float.valueOf(dataList.get(4));
float avgViewDropOff = Float.valueOf(dataList.get(5));

现在获取值并分配给Individual int和float，获取ArrayIndexOutofBoundsException。这是因为有时列表返回的大小为4而不是6.这是代码：

reportDataList = getReportData(entry.id);
    //System.out.println("reportDataList.size()"+reportDataList.size());
    if(reportDataList.size() >= 1) {
        for(int i=0;i<reportDataList.size();i++) { 
            if(!reportDataList.get(0).equals("")) {
                playsCount = Integer.parseInt(reportDataList.get(0));
                }
            if(!reportDataList.get(1).equals("")) {
                sumTimeViewed = Float.valueOf(reportDataList.get(1));
                }
            if(!reportDataList.get(2).equals("")) {
                avgTimeViewed = Float.valueOf(reportDataList.get(2));
                }
            if(!reportDataList.get(3).equals("")) {
                loadsCount = Integer.parseInt(reportDataList.get(3));
                }
            if(!reportDataList.get(4).equals("")) {
                loadPlayRatio =Float.valueOf(reportDataList.get(4));
                }
            if(!reportDataList.get(5).equals("")) {
                avgViewDropOff = Float.valueOf(reportDataList.get(5));
        }
        }
    }

这是getReportData方法：

private List<String> getReportData(String id) throws KalturaApiException {
    List<String> headerList = null;
    List<String> dataList = new ArrayList<String>();
    ReportService reportService = client.getReportService();
    ReportType reportType = ReportType.TOP_CONTENT;
    ReportInputFilter reportInputFilter = new ReportInputFilter();
    reportInputFilter.fromDate = 1390156200;
    reportInputFilter.toDate = 1453660200;
    ReportTotal reportTotal = reportService.getTotal(reportType, reportInputFilter, id);
    String data = reportTotal.data;
    if(data != null) {
        dataList = Arrays.asList(data.split(","));
    }
    if(dataList.size() >= 1) {
        System.out.println("dataList.size() ------->"+dataList.size());
    }
    return dataList;
    }

如何为任何可接受的列表大小解决此问题？

先谢谢的Raji

Answer 1

我认为您的问题是由于来自互联网的返回字符串的长度不可预测。

如果你的字符串可以有4个用'，'分隔的数字，你将获得4个字符串，索引从0到3。

但是如果你有6个用逗号分隔的数字，那么你将得到6个索引从0到5的字符串。

由于这个原因，我认为你必须检测列表的大小（使用dataList.size()），然后处理不同的代码部分，例如，size = 4或size = 6。

此外，如果来自互联网的输入字符串将始终具有“固定”不同的可能大小（即siez = 4或大小= 6而没有其他大小），您可以使用switch(dataList.size())来解决问题，但是如果你的长度不可预测，所以你的大小总是不同的，我建议你以语义的方式修改你的代码，这会导致你编写更好的代码，因为我认为你的代码对于特定的代码来说是“固定的”案件。如果是这种情况，那么继续编码。但如果不是，我建议考虑更多适应性解决方案。

Answer 2

这是我现在修复的方式：

if(reportDataList.size() == 4) {
            //System.out.println("Size is 4");
            for(int i=0;i<reportDataList.size();i++) { 
                if(!reportDataList.get(0).equals("")) {
                    playsCount = Integer.parseInt(reportDataList.get(0));
                    //System.out.println("playsCount :"+playsCount);
                    accountVO.setMediaPlays(playsCount);
                }
                if(!reportDataList.get(1).equals("")) {
                    sumTimeViewed = Float.valueOf(reportDataList.get(1));
                    //System.out.println("sumTimeViewed :"+sumTimeViewed);
                    accountVO.setSumTimeViewed(sumTimeViewed);
                }
                if(!reportDataList.get(2).equals("")) {
                    avgTimeViewed = Float.valueOf(reportDataList.get(2));
                    //System.out.println("avgTimeViewed :"+avgTimeViewed);
                    accountVO.setAvgViewTime(avgTimeViewed);
                }
                if(!reportDataList.get(3).equals("")) {
                    loadsCount = Integer.parseInt(reportDataList.get(3));
                    //System.out.println("loadsCount :"+loadsCount);

                }
            }
        }
        else {
            //System.out.println("Size is not 4");
            for(int i=0;i<reportDataList.size();i++) { 
                if(!reportDataList.get(0).equals("")) {
                    playsCount = Integer.parseInt(reportDataList.get(0));
                    accountVO.setMediaPlays(playsCount);
                    //System.out.println("playsCount :"+playsCount);
                }
                if(!reportDataList.get(1).equals("")) {
                    sumTimeViewed = Float.valueOf(reportDataList.get(1));
                    //System.out.println("sumTimeViewed :"+sumTimeViewed);
                    accountVO.setSumTimeViewed(sumTimeViewed);
                }
                if(!reportDataList.get(2).equals("")) {
                    avgTimeViewed = Float.valueOf(reportDataList.get(2));
                    //System.out.println("avgTimeViewed :"+avgTimeViewed);
                    accountVO.setSumTimeViewed(sumTimeViewed);
                }
                if(!reportDataList.get(3).equals("")) {
                    loadsCount = Integer.parseInt(reportDataList.get(3));
                    //System.out.println("loadsCount :"+loadsCount);
                }
                if(!reportDataList.get(4).equals("")) {
                    loadPlayRatio =Float.valueOf(reportDataList.get(4));
                    //System.out.println("loadPlayRatio :"+loadPlayRatio);
                    accountVO.setPlayToImpressionRatio(loadPlayRatio);
                }
                if(!reportDataList.get(5).equals("")) {
                    avgViewDropOff = Float.valueOf(reportDataList.get(5));
                    //System.out.println("avgViewDropOff :"+avgViewDropOff);
                    accountVO.setAvgViewDropOff(avgViewDropOff);
                }
            }

        }

Java ArrayList of Strings Throwing ArrayIndexOutOfBoundException

2 个答案: