String与XML互转以及从XML取节点值并修改的方法
读取xml文件生成Document对象
Document转换成String类型串
String串转成xml
已知xml节点取节点值
已知xml节点修改节点值
一个xml文件：
批量业务现存 0085213560 6225885517843413 201958.65 0 20170801101030 CNY 201958.65 100000.00 101019 WCS0000200 632376531000009 5200 0000 20170821 CBS WCS SYN 1.0 101216 0000 0000 20170809 ESB WCS
java实现实例：
packagecom.adtec.mq.client;
importjava.io.ByteArrayInputStream;
importjava.io.ByteArrayOutputStream;
importjava.io.File;
importjava.io.InputStream;
importjavax.xml.parsers.DocumentBuilder;
importjavax.xml.parsers.DocumentBuilderFactory;
importjavax.xml.transform.Transformer;
importjavax.xml.transform.TransformerFactory;
importjavax.xml.transform.dom.DOMSource;
importjavax.xml.transform.stream.StreamResult;
importjavax.xml.xpath.XPath;
importjavax.xml.xpath.XPathConstants;
importjavax.xml.xpath.XPathExpressionException;
importjavax.xml.xpath.XPathFactory;
importorg.w3c.dom.Document;
importorg.w3c.dom.Node;
publicclassTest{
/**
*
*@paramdocument
*Document对象（读xml生成的）
*@returnString字符串
*@throwsThrowable
*/
publicStringxmlToString(Documentdocument)throwsThrowable{
TransformerFactoryft=TransformerFactory.newInstance();
Transformerff=ft.newTransformer();
ff.setOutputProperty("encoding","GB2312");
ByteArrayOutputStreambos=newByteArrayOutputStream();
ff.transform(newDOMSource(document),newStreamResult(bos));
returnbos.toString();
}
/**
*
*@paramxml形状的str串
*@returnDocument对象
*/
publicDocumentStringTOXml(Stringstr){
StringBuildersXML=newStringBuilder();
sXML.append(str);
DocumentBuilderFactorydbf=DocumentBuilderFactory.newInstance();
Documentdoc=null;
try{
InputStreamis=newByteArrayInputStream(sXML.toString().getBytes("utf-8"));
doc=dbf.newDocumentBuilder().parse(is);
is.close();
}catch(Exceptione){
e.printStackTrace();
}
returndoc;
}
/**
*
*@paramdocument
*@return某个节点的值前提是需要知道xml格式，知道需要取的节点相对根节点所在位置
*/
publicStringgetNodeValue(Documentdocument,StringnodePaht){
XPathFactoryxpfactory=XPathFactory.newInstance();
XPathpath=xpfactory.newXPath();
StringservInitrBrch="";
try{
servInitrBrch=path.evaluate(nodePaht,document);
}catch(XPathExpressionExceptione){
e.printStackTrace();
}
returnservInitrBrch;
}
/**
*
*@paramdocument
*@paramnodePath
*需要修改的节点相对根节点所在位置
*@paramvodeValue
*替换的值
*/
publicvoidsetNodeValue(Documentdocument,StringnodePath,StringvodeValue){
XPathFactoryxpfactory=XPathFactory.newInstance();
XPathpath=xpfactory.newXPath();
Nodenode=null;
;
try{
node=(Node)path.evaluate(nodePath,document,XPathConstants.NODE);
}catch(XPathExpressionExceptione){
e.printStackTrace();
}
node.setTextContent(vodeValue);
}
publicstaticvoidmain(String[]args)throwsThrowable{
//读取xml文件，生成document对象
DocumentBuilderbuilder=DocumentBuilderFactory.newInstance().newDocumentBuilder();
//文件的位置在工作空间的根目录（位置随意，只要写对就ok）
Documentdocument=builder.parse(newFile("a.xml"));
Testt=newTest();
//XML————》String
Stringstr=t.xmlToString(document);
System.out.println("str:"+str);
//String————》XML
Documentdoc=t.StringTOXml(str);
StringnodePath="/transaction/header/msg/sndMbrCd";
//getNodeValue
StringnodeValue=t.getNodeValue(doc,nodePath);
System.out.println("修改前nodeValue："+nodeValue);
//setNodeValue
t.setNodeValue(doc,nodePath,nodeValue+"hello");
System.out.println("修改后nodeValue："+t.getNodeValue(doc,nodePath));
}
}
测试结果：
str:修改前nodeValue：5200 修改后nodeValue：5200hello 批量业务现存 0085213560 6225885517843413 201958.65 0 20170801101030 CNY 201958.65 100000.00 101019 WCS0000200 632376531000009 5200 0000 20170821 CBS WCS SYN 1.0 101216 0000 0000 20170809 ESB WCS
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