String與XML互轉以及從XML取節點值並修改
阿新 • • 發佈：2019-01-27
- 讀取xml檔案生成Document物件
- Document轉換成String型別串
- 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檔案：
<?xml version="1.0" encoding="UTF-8"?>
<transaction>
<body>
<request>
<tranTyp>批量業務現存</tranTyp>
<acctNm>0085213560</acctNm>
<acctNo java實現例項：
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物件（讀xml生成的）
* @return String字串
* @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 物件
*/
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檔案，生成document物件
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
// 檔案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("修改後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
修改後nodeValue：5200hello