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：
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<?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>
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java实现实例：
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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));
}
}
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测试结果：
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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
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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服务器之家。
原文链接：https://blog.csdn.net/leisure_life/article/details/78931577