Question

I am working on StaxParser and want to read a xml file.

我使用了以下代码：

    public class StaxParserDemo {
        public static void main(String args[]){
        try{
        List<PLQ22> plqList = new ArrayList<>();
        PLQ22 currEmp = null;
        String tagContent = null;
        XMLInputFactory factory = XMLInputFactory.newInstance();
        XMLStreamReader reader = factory.createXMLStreamReader(new FileInputStream("/home/vipul/Documents/config.xml"));

        while(reader.hasNext()){
          int event = reader.next();

          switch(event){
            case XMLStreamConstants.START_ELEMENT: 
              if ("EpsonPLQ22_PassbookPrinter".equals(reader.getLocalName())){
                currEmp = new PLQ22();
             }

              break;

            case XMLStreamConstants.CHARACTERS:
              tagContent = reader.getText().trim();
              break;

            case XMLStreamConstants.END_ELEMENT:
              switch(reader.getLocalName()){
                case "EpsonPLQ22_PassbookPrinter":
                    plqList.add(currEmp);
                 //   currEmp.Auto_Start=tagContent;

                  break;
                case "Barcode_Length":
                  currEmp.Barcode_Length = tagContent;
tagContent=null;                  
break;
                case "Lower_Barcode_length":
                  currEmp.Lower_Barcode_length = tagContent;
tagContent=null;                
  break;
                case "Upper_Barcode_Length":
                  currEmp.Upper_Barcode_Length = tagContent;
tagContent=null;                
  break;
              }
       if ("EpsonPLQ22_PassbookPrinter".equals(reader.getLocalName())){
            currEmp = null;
         }
              break;

            case XMLStreamConstants.START_DOCUMENT:
              plqList = new ArrayList<>();
              break;
          }

        }


        for ( PLQ22 emp : plqList){
          System.out.println(emp);
        }
    }
        catch(Exception e){
        e.printStackTrace();
    }
        }
    }
    class PLQ22{

        String Auto_Start;
      String Barcode_Length;
      String Lower_Barcode_length;
      String Upper_Barcode_Length;

      @Override
      public String toString(){
        return Barcode_Length+" "+Lower_Barcode_length+" "+Upper_Barcode_Length;
      }
    }

我有一个非常大的config.xml文件，它有很多节点，但我想读取EpsonPLQ22_PassbookPrinter节点的值。

在得到我真正想要的值之后，它给了我多个空值。

xml文件是这样的：

<ACU_Config_File>
  <ApplicationManager_Config>
    <ConsumerDisplay_Config>
      <Resolution>1366 x 768</Resolution>
    </ConsumerDisplay_Config>
    <Maintenance_Application>
      <Cash_Deposit_Report>ON</Cash_Deposit_Report>
      <Idle_Time>1</Idle_Time>
      <Lockout_Time>1</Lockout_Time>
      <ATM_EXE_NAME>ATM</ATM_EXE_NAME>
      <ATM_PATH>C:\Program Files\Forbes\Microbanker\Bin\ATM.exe</ATM_PATH>
    </Maintenance_Application>
    <ReportSettings_Config>
      <ChequeDeposit_ReportSettings>
        <EndorsementReportSettings_Config>
          <TransactionId Present="True" />
          <ChequeNo Present="True" />
          <Endorsement Present="False" />
        </EndorsementReportSettings_Config>
        <EndorsementSettings_Config Required="False">
.
.
.
.
.
.
.
<EpsonPLQ22_PassbookPrinter>
        <Auto_Start>Start</Auto_Start>
        <Barcode_Length>7</Barcode_Length>
    <Lower_Barcode_length>14</Lower_Barcode_length>
    <Upper_Barcode_Length>13</Upper_Barcode_Length>
      </EpsonPLQ22_PassbookPrinter>


.
.
.
.
<PassbookPrintingTimeOut>30</PassbookPrintingTimeOut>
      <InstructionTimeOut>30</InstructionTimeOut>
      <InsertChequeTimeOut>30</InsertChequeTimeOut>
      <SelectLanguageTimeOut>30</SelectLanguageTimeOut>
    </MFK_TIMERS_CONFIG>
  </MFK_ApplicationManager_Config>
</ACU_Config_File>

我需要在代码中进行哪些更改才能获取空值并直接获取节点值。

我得到的输出是这样的：

空空值空值空值空值空值空值空值空值空值空值空值空值空值空值空值空值空值 7 14 13 7 14 13 7 14 13 7 14 13 7 14 13 7 14 13 7 14 13 7 14 13 7 14 13 7 14 13 7 14 13 7 14 13 7 14 13 7 14 13 7 14 13

提前致谢。

在读取大型XML文件时使用Stax Parser提供NULL

0 个答案: