String与XML互转以及从XML取节点值并修改的方法

     批量业务现存00852135606225885517843413201958.65020170801101030CNY201958.65100000.00
  101019WCS00002006323765310000095200000020170821CBSWCSSYN1.0 1012160000000020170809ESBWCS

 package com.adtec.mq.client; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.InputStream; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import javax.xml.xpath.XPath; import javax.xml.xpath.XPathConstants; import javax.xml.xpath.XPathExpressionException; import javax.xml.xpath.XPathFactory; import org.w3c.dom.Document; import org.w3c.dom.Node; public class Test { /** * * @param document *   Document对象（读xml生成的） * @return String字符串 * @throws Throwable */ public String xmlToString(Document document) throws Throwable { TransformerFactory ft = TransformerFactory.newInstance(); Transformer ff = ft.newTransformer(); ff.setOutputProperty("encoding", "GB2312"); ByteArrayOutputStream bos = new ByteArrayOutputStream(); ff.transform(new DOMSource(document), new StreamResult(bos)); return bos.toString(); } /** * * @param xml形状的str串 * @return Document 对象 */ public Document StringTOXml(String str) { StringBuilder sXML = new StringBuilder(); sXML.append(str); DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); Document doc = null; try { InputStream is = new ByteArrayInputStream(sXML.toString().getBytes("utf-8")); doc = dbf.newDocumentBuilder().parse(is); is.close(); } catch (Exception e) { e.printStackTrace(); } return doc; } /** * * @param document * @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 */ public String getNodeValue(Document document, String nodePaht) { XPathFactory xpfactory = XPathFactory.newInstance(); XPath path = xpfactory.newXPath(); String servInitrBrch = ""; try { servInitrBrch = path.evaluate(nodePaht, document); } catch (XPathExpressionException e) { e.printStackTrace(); } return servInitrBrch; } /** * * @param document * @param nodePath *   需要修改的节点相对根节点所在位置 * @param vodeValue *   替换的值 */ public void setNodeValue(Document document, String nodePath, String vodeValue) { XPathFactory xpfactory = XPathFactory.newInstance(); XPath path = xpfactory.newXPath(); Node node = null; ; try { node = (Node) path.evaluate(nodePath, document, XPathConstants.NODE); } catch (XPathExpressionException e) { e.printStackTrace(); } node.setTextContent(vodeValue); } public static void main(String[] args) throws Throwable { // 读取xml文件，生成document对象 DocumentBuilder builder = 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） Document document = builder.parse(new File("a.xml")); Test t = new Test(); // XML――――》String String str = t.xmlToString(document); System.out.println("str:" + str); // String ――――》XML Document doc = t.StringTOXml(str); String nodePath = "/transaction/header/msg/sndMbrCd"; // getNodeValue String nodeValue = 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)); } }

 str:   批量业务现存00852135606225885517843413201958.65020170801101030CNY201958.65100000.00
  101019WCS00002006323765310000095200000020170821CBSWCSSYN1.0 1012160000000020170809ESBWCS 修改前nodeValue：5200 修改后nodeValue：5200hello