Java DOM Parser XML [英] Java DOM Parser XML
本文介绍了Java DOM Parser XML的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我需要从以下XML文件中提取< Item Name =CanonicalSmiles> 中的属性值（部分显示）？
I need to extract attribute values from <Item Name="CanonicalSmiles"> from following XML file (part is shown) ?
我试过 getElementsByTagName（Item）。item（12）.getTextContent（））; 但是对于不同的< DocSum> s项目（i）不同（即不总是12个！）
I tried getElementsByTagName("Item").item(12).getTextContent()); But for different <DocSum>s item(i) is different (ie not 12 always!)
我该怎么办这个？？
<?xml version="1.0"?>
<!DOCTYPE eSummaryResult PUBLIC "-//NLM//DTD eSummaryResult, 29 October 2004//EN" "http://www.ncbi.nlm.nih.gov/entrez/query/DTD/eSummary_041029.dtd">
<eSummaryResult>
<DocSum>
<Id>53359352</Id>
<Item Name="CID" Type="Integer">53359352</Item>
<Item Name="SourceNameList" Type="List"></Item>
<Item Name="SourceIDList" Type="List"></Item>
<Item Name="SourceCategoryList" Type="List">
<Item Name="string" Type="String">Journal Publishers</Item>
</Item>
<Item Name="CreateDate" Type="Date">2011/09/19 00:00</Item>
<Item Name="SynonymList" Type="List"></Item>
<Item Name="MeSHHeadingList" Type="List"></Item>
<Item Name="MeSHTermList" Type="List"></Item>
<Item Name="PharmActionList" Type="List"></Item>
<Item Name="CommentList" Type="List"></Item>
<Item Name="IUPACName" Type="String">2-hydroxy-6-[2-(4-hydroxyphenyl)-2-oxoethyl]benzoic acid</Item>
<Item Name="CanonicalSmiles" Type="String">C1=CC(=C(C(=C1)O)C(=O)O)CC(=O)C2=CC=C(C=C2)O</Item>
<Item Name="RotatableBondCount" Type="Integer">4</Item>
<Item Name="MolecularFormula" Type="String">C15H12O5</Item>
<Item Name="MolecularWeight" Type="String">272.252780</Item>
<Item Name="TotalFormalCharge" Type="Integer">0</Item>
<Item Name="XLogP" Type="String"></Item>
<Item Name="HydrogenBondDonorCount" Type="Integer">3</Item>
<Item Name="HydrogenBondAcceptorCount" Type="Integer">5</Item>
<Item Name="Complexity" Type="String">359.000000</Item>
<Item Name="HeavyAtomCount" Type="Integer">20</Item>
<Item Name="AtomChiralCount" Type="Integer">0</Item>
<Item Name="AtomChiralDefCount" Type="Integer">0</Item>
<Item Name="AtomChiralUndefCount" Type="Integer">0</Item>
<Item Name="BondChiralCount" Type="Integer">0</Item>
<Item Name="BondChiralDefCount" Type="Integer">0</Item>
<Item Name="BondChiralUndefCount" Type="Integer">0</Item>
<Item Name="IsotopeAtomCount" Type="Integer">0</Item>
<Item Name="CovalentUnitCount" Type="Integer">1</Item>
<Item Name="TautomerCount" Type="Integer">67</Item>
<Item Name="SubstanceIDList" Type="List"></Item>
<Item Name="TPSA" Type="String">94.8</Item>
<Item Name="AssaySourceNameList" Type="List"></Item>
<Item Name="MinAC" Type="String"></Item>
<Item Name="MaxAC" Type="String"></Item>
<Item Name="MinTC" Type="String"></Item>
<Item Name="MaxTC" Type="String"></Item>
<Item Name="ActiveAidCount" Type="Integer">0</Item>
<Item Name="InactiveAidCount" Type="Integer">0</Item>
<Item Name="TotalAidCount" Type="Integer">0</Item>
<Item Name="InChIKey" Type="String">YIGHIFUVVSYMFG-UHFFFAOYSA-N</Item>
<Item Name="InChI" Type="String">InChI=1S/C15H12O5/c16-11-6-4-9(5-7-11)13(18)8-10-2-1-3-12(17)14(10)15(19)20/h1-7,16-17H,8H2,(H,19,20)</Item>
</DocSum>
<DocSum>
<Id>53346823</Id>
<Item Name="CID" Type="Integer">53346823</Item>
<Item Name="SourceNameList" Type="List"></Item>
<Item Name="SourceIDList" Type="List"></Item>
<Item Name="SourceCategoryList" Type="List">
<Item Name="string" Type="String">Biological Properties</Item>
</Item>
<Item Name="CreateDate" Type="Date">2011/09/01 00:00</Item>
<Item Name="SynonymList" Type="List">
<Item Name="string" Type="String">HMS2478O14</Item>
</Item>
<Item Name="MeSHHeadingList" Type="List"></Item>
<Item Name="MeSHTermList" Type="List"></Item>
<Item Name="PharmActionList" Type="List"></Item>
<Item Name="CommentList" Type="List">
<Item Name="string" Type="String">Asinex Ltd.:BAS 02768155</Item>
</Item>
<Item Name="IUPACName" Type="String">ethyl 3-amino-3-(1,3-benzodioxol-5-yl)propanoate chloride</Item>
<Item Name="CanonicalSmiles" Type="String">CCOC(=O)CC(C1=CC2=C(C=C1)OCO2)N.[Cl-]</Item>
<Item Name="RotatableBondCount" Type="Integer">5</Item>
<Item Name="MolecularFormula" Type="String">C12H15ClNO4-</Item>
<Item Name="MolecularWeight" Type="String">272.704800</Item>
<Item Name="TotalFormalCharge" Type="Integer">-1</Item>
<Item Name="XLogP" Type="String"></Item>
<Item Name="HydrogenBondDonorCount" Type="Integer">1</Item>
<Item Name="HydrogenBondAcceptorCount" Type="Integer">6</Item>
<Item Name="Complexity" Type="String">271.000000</Item>
<Item Name="HeavyAtomCount" Type="Integer">18</Item>
<Item Name="AtomChiralCount" Type="Integer">1</Item>
<Item Name="AtomChiralDefCount" Type="Integer">0</Item>
<Item Name="AtomChiralUndefCount" Type="Integer">1</Item>
<Item Name="BondChiralCount" Type="Integer">0</Item>
<Item Name="BondChiralDefCount" Type="Integer">0</Item>
<Item Name="BondChiralUndefCount" Type="Integer">0</Item>
<Item Name="IsotopeAtomCount" Type="Integer">0</Item>
<Item Name="CovalentUnitCount" Type="Integer">2</Item>
<Item Name="TautomerCount" Type="Integer">1</Item>
<Item Name="SubstanceIDList" Type="List"></Item>
<Item Name="TPSA" Type="String">70.8</Item>
<Item Name="AssaySourceNameList" Type="List"></Item>
<Item Name="MinAC" Type="String"></Item>
<Item Name="MaxAC" Type="String"></Item>
<Item Name="MinTC" Type="String"></Item>
<Item Name="MaxTC" Type="String"></Item>
<Item Name="ActiveAidCount" Type="Integer">0</Item>
<Item Name="InactiveAidCount" Type="Integer">0</Item>
<Item Name="TotalAidCount" Type="Integer">0</Item>
<Item Name="InChIKey" Type="String">NKQHQIJWIYNEIX-UHFFFAOYSA-M</Item>
<Item Name="InChI" Type="String">InChI=1S/C12H15NO4.ClH/c1-2-15-12(14)6-9(13)8-3-4-10-11(5-8)17-7-16-10;/h3-5,9H,2,6-7,13H2,1H3;1H/p-1</Item>
</DocSum>
推荐答案
XPathFactory xpf = XPathFactory.newInstance();
XPath xp = xpf.newXPath();
XPathExpression xe = xp.compile("//DocSum/Item[@Name='CanonicalSmiles']/text()");
NodeList nodes = (NodeList)xe.evaluate(yourdom, XPathConstants.NODESET);
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