讀取xml文件生成Document對象
Document轉換成String類型串
String串轉成xml
已知xml節點取節點值
已知xml節點修改節點值
一個xml文件：
<?xml version="1.0" encoding="UTF-8"?><transaction> <body> <request> <tranTyp>批量業務現存</tranTyp> <acctNm>0085213560</acctNm> <acctNo>6225885517843413</acctNo> <avlBal>201958.65</avlBal> <acctTyp>0</acctTyp> <tranTime>20170801101030</tranTime> <currencyTyp>CNY</currencyTyp> <tranDesc></tranDesc> <bal>201958.65</bal> <tranAmt>100000.00</tranAmt> </request> </body> <header> <msg> <sndTm>101019</sndTm> <msgCd>WCS0000200</msgCd> <seqNb>632376531000009</seqNb> <sndMbrCd>5200</sndMbrCd> <rcvMbrCd>0000</rcvMbrCd> <sndDt>20170821</sndDt> <sndAppCd>CBS</sndAppCd> <rcvAppCd>WCS</rcvAppCd> <callTyp>SYN</callTyp> </msg> <ver>1.0</ver> <pnt> <sndTm>101216</sndTm> <sndMbrCd>0000</sndMbrCd> <rcvMbrCd>0000</rcvMbrCd> <sndDt>20170809</sndDt> <sndAppCd>ESB</sndAppCd> <rcvAppCd>WCS</rcvAppCd> </pnt> </header></transaction>
java實現實例：
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對象（讀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形狀的str串 * @return Document 對象 */ 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 某個節點的值 前提是需要知道xml格式，知道需要取的節點相對根節點所在位置 */ 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 * 需要修改的節點相對根節點所在位置 * @param vodeValue * 替換的值 */ 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 { // 讀取xml文件，生成document對象 DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); // 文件的位置在工作空間的根目錄（位置隨意，只要寫對就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)); }}測試結果：
str:<?xml version="1.0" encoding="UTF-8" standalone="no"?><transaction> <body> <request> <tranTyp>批量業務現存</tranTyp> <acctNm>0085213560</acctNm> <acctNo>6225885517843413</acctNo> <avlBal>201958.65</avlBal> <acctTyp>0</acctTyp> <tranTime>20170801101030</tranTime> <currencyTyp>CNY</currencyTyp> <tranDesc/> <bal>201958.65</bal> <tranAmt>100000.00</tranAmt> </request> </body> <header> <msg> <sndTm>101019</sndTm> <msgCd>WCS0000200</msgCd> <seqNb>632376531000009</seqNb> <sndMbrCd>5200</sndMbrCd> <rcvMbrCd>0000</rcvMbrCd> <sndDt>20170821</sndDt> <sndAppCd>CBS</sndAppCd> <rcvAppCd>WCS</rcvAppCd> <callTyp>SYN</callTyp> </msg> <ver>1.0</ver> <pnt> <sndTm>101216</sndTm> <sndMbrCd>0000</sndMbrCd> <rcvMbrCd>0000</rcvMbrCd> <sndDt>20170809</sndDt> <sndAppCd>ESB</sndAppCd> <rcvAppCd>WCS</rcvAppCd> </pnt> </header></transaction>修改前nodeValue：5200修改后nodeValue：5200hello
以上這篇String與XML互轉以及從XML取節點值并修改的方法就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持VeVb武林網。
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