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String与XML互转以及从XML取节点值并修改的方法

程序员文章站 2024-02-13 15:17:52
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...

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。