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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：
<?xml version="1.0" encoding="UTF-8"?> <transaction> <body> <request> <tranTyp>批量业务现存</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实现实例：
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));
}
}
测试结果：
str:<?xml version="1.0" encoding="UTF-8" standalone="no"?><transaction> <body> <request> <tranTyp>批量业务现存</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
以上这篇String与XML互转以及从XML取节点值并修改的方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持亿速云。
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