Question

        private static final String[] columns = new String[] {
             "policyID","statecode","county","eq_site_limit","hu_site_limit","fl_site_limit",
             "fr_site_limit","tiv_2011","tiv_2012","eq_site_deductible","hu_site_deductible","fl_site_deductible",
             "fr_site_deductible","point_latitude","point_longitude","line","construction","point_granularity"
        }

        String file = props.getProperty("file");

        ColumnPositionMappingStrategy<Weather> strateg = new ColumnPositionMappingStrategy<Weather>();
        strateg.setType(Weather.class);

        strateg.setColumnMapping(columns);

        CsvToBean<Weather> csv = new CsvToBean<Weather>();
        CSVReader reader = new CSVReader(new FileReader(file),',','\"',1);
        List<Weather> list = csv.parse(strateg, reader);

        for(Object object: list){
            Weather weather = (Weather)object;
            conection.importCsvData(weather);
        }

，错误是这样的：

 Exception in thread "main" java.lang.RuntimeException: Error parsing CSV line: 1 values: [119736, FL, CLAY COUNTY, 498960, 498960,
 498960, 498960, 498960, 792148.9, 0, 9979.2, 0, 0, 30.102261,
 -81.711777, Residential, Masonry, 1]
            at com.opencsv.bean.CsvToBean.parse(CsvToBean.java:100)
            at com.opencsv.bean.CsvToBean.parse(CsvToBean.java:72)
            at Test.main(Test.java:44)
         Caused by: java.lang.NullPointerException
            at com.opencsv.bean.CsvToBean.processProperty(CsvToBean.java:138)
            at com.opencsv.bean.CsvToBean.processLine(CsvToBean.java:127)
            at com.opencsv.bean.CsvToBean.processLine(CsvToBean.java:106)
            at com.opencsv.bean.CsvToBean.parse(CsvToBean.java:96)
            ... 2 more

我每次都会收到此错误。如果有人有想法会很好！当我上次遇到这个错误时，那是因为我忘了在列上的两个单词之间加一个逗号。如果您有任何想法，请尽快给我写信。谢谢。

Answer 1

问题是：java.lang.NullPointerException。解决方案：转到第138行的文件CsvToBean.java。在开始使用任何参数之前检查null。

在库中包含CsvToBean文件，您需要查看此类中的哪个参数获得Null。之后，在调用此库之前验证输入数据，如果输入无效，则不再调用此类。

解析没有解决方案的CSV行时出错

1 个答案: