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：

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:
 
  
   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
  
 

修改前nodeValue：5200
修改后nodeValue：5200hello

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