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I have sale tag as child node that exists for multiple times but in that Employee tag doesn't exists for all sale tag.need to parse this xml.Got Null pointer exception when there is no employee tag.How to parse this xml even if some child tag name doesn't exists?

<?xml version="1.0" encoding="ISO-8859-1"?>
   <Transactions>
      <DocumentInfo TransferType="Transactions" Copyright="2010, Hectronic GmbH" CreatedBy="HecPoll">
       <CreateDate Year="2011" Month="7" Day="13"/>
       <CreateTime Hour="6" Minute="0" Second="16"/>
      </DocumentInfo>
      <DocumentData>
      <Sale RcpNum="151" Amount="228.760" Station="1" Customer="000003" Terminal="1">
        <Date Year="2011" Month="07" Day="12"/>
        <Time Hour="07" Minute="23" Second="00"/>
        <ArticleSale Quantity="6.020" SglPriceAsSold="38.000" SglPriceAsStored="38.000" SglPrice="38.000" Amount="228.760" FCCAmount="228.760" Taxrate="18" LogicalFPNumber="1" TankNumber="3" ArtNum="3" SaleNum="1"/>
        <Payment PAN="000000002117904490D" Amount="228.760" TenderCode="0" PayNum="1"/>
        <Employee Lastname="V KALYANI"/>
        <Vehicle LicensePlate="10K"/>
      </Sale>
      <Sale RcpNum="255" Amount="6650.000" Station="1" Customer="ZZZZZZ" Terminal="0">
        <Date Year="2011" Month="07" Day="12"/>
        <Time Hour="07" Minute="24" Second="00"/>
        <ArticleSale Quantity="175.000" SglPriceAsSold="38.000" SglPriceAsStored="38.000" SglPrice="38.000" Amount="6650.000" FCCAmount="6650.000" Taxrate="19" LogicalFPNumber="1" TankNumber="1" ArtNum="3" SaleNum="1"/>
        <Payment PAN="000000001885018677D" Amount="6650.000" TenderCode="0" PayNum="1"/>
      </Sale>
      <Sale RcpNum="152" Amount="3078.000" Station="1" Customer="000003" Terminal="1">
        <Date Year="2011" Month="07" Day="12"/>
        <Time Hour="07" Minute="27" Second="00"/>
        <ArticleSale Quantity="81.000" SglPriceAsSold="38.000" SglPriceAsStored="38.000" SglPrice="38.000" Amount="3078.000" FCCAmount="3078.000" Taxrate="18" LogicalFPNumber="1" TankNumber="3" ArtNum="3" SaleNum="1"/>
        <Payment PAN="000000002117928224D" Amount="3078.000" TenderCode="0" PayNum="1"/>
        <Employee Lastname="A MUNIYANDI"/>
        <Vehicle LicensePlate="10F"/>
      </Sale>
   </DocumentData>
</Transactions>

Thanks,

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1 回答 1

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我假设您正在使用 dom 解析器。如果您正在使用getElementsByTagName()方法，如果没有找到这样的元素，它将返回 null。您最好检查 Employee 标签的空值。

于 2013-03-28T07:01:35.383 回答