java讀寫xml

❶ java 讀取和修改本地xml配置文件

dom4j解析
package demo;
import java.io.*;

import org.dom4j.*;
import org.dom4j.io.*;
import java.util.*;

public class WriteXML {
public void writer(){
//在內存中創建一個文檔對象
Document doc=DocumentHelper.createDocument();
//往文檔對象中添加一個元素
Element root=doc.addElement("users");
//將上面創建元素的設為根元素
doc.setRootElement(root);

//為根元素添加一個名稱為user的子元素
Element user1=root.addElement("user");
//為user子元素添加一個id的屬性 並賦值
user1.addAttribute("id","1");
//為user子元素添加一個子元素
Element name1=user1.addElement("name");
//為name子元素設置文本
name1.setText("zz");
Element config1=user1.addElement("config");
config1.setText("fullscreen");

Element user2=root.addElement("user");
//為user子元素添加一個id的屬性 並賦值
user2.addAttribute("id","2");
//為user子元素添加一個子元素
Element name2=user2.addElement("name");
//為name子元素設置文本
name2.setText("xx");
Element config2=user2.addElement("config");
config2.setText("widescreen");

//下面將會進行輸出產生XML文件
OutputFormat format=OutputFormat.createPrettyPrint();
format.setEncoding("GBK");
format.setIndent(true);
format.setNewLineAfterNTags(1);
format.setNewlines(true);

try {
XMLWriter writer=new XMLWriter(new FileOutputStream("users.xml"),format);
writer.write(doc);
writer.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

/*
Element user2=user1.createCopy();
user2.attribute("id").setValue("2");
Iterator it=user2.elementIterator();
while(it.hasNext()){
it.next();
}*/

}
}

❷ java讀取配置文件的方法(xml)

#include <XMLDoc.hpp>
——相關說明
_di_IXMLDocument 為模板類
typedef System::DelphiInterface< IXMLDocument > _di_IXMLDocument;

_di_IXMLNode
typedef System::DelphiInterface< IXMLNode > _di_IXMLNode;

_di_IXMLNodeList 同

——類方法
//設置參數
void TXXX::setOptions(String name,String value){

//創建文檔對象
_di_IXMLDocument XMLDoc = LoadXMLDocument(L"文件路徑");

XMLDoc->Active=true;

//文檔根節點
_di_IXMLNode root = XMLDoc->DocumentElement;

//想要查找節點
_di_IXMLNode tempNode;

//調用搜索方法
searchXml(name,root,tempNode);

// 處理
if(tempNode!=NULL)
tempNode->SetText(value);
XMLDoc->SaveToFile(L"文件路徑");
}
//遞歸搜索參數節點樹
void TXXX::searchXml(String name,_di_IXMLNode &Parent_Node,_di_IXMLNode& tempNode){

_di_IXMLNode Child_Node; //子結點
//子節點列表
_di_IXMLNodeList list = Parent_Node->ChildNodes;
for(int i=0;i<list->Count;i++)
{
Child_Node = list->Get(i);
//遞歸結束條件
if(Child_Node->GetNodeName()==name)
{
tempNode = Child_Node;
break;
}
else
{
//遞歸函數
searchXml(name,Child_Node,tempNode);
}
}
}

❸ java怎樣讀寫和修改XML文件

xml:

<?xml version="1.0" encoding="UTF-8"?>

<users>

<Messages>
<sendName>sendUsers</sendName>
<receiveName>snake</receiveName>
<date>2007-12-04 12:20:00</date>
<status>0</status>
<message>this is Content</message>
</Messages>

</users>

java:

package com.lianxi.DAO;
import java.io.File;

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 org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class UpdateXml {
public static boolean doc2XmlFile(Document document,String filename)
{
boolean flag = true;
try
{
/** 將document中的內容寫入文件中 */
TransformerFactory tFactory = TransformerFactory.newInstance();
Transformer transformer = tFactory.newTransformer();
/** 編碼 */
//transformer.setOutputProperty(OutputKeys.ENCODING, "GB2312");
DOMSource source = new DOMSource(document);
StreamResult result = new StreamResult(new File(filename));
transformer.transform(source, result);
}catch(Exception ex)
{
flag = false;
ex.printStackTrace();
}
return flag;
}

public static Document load(String filename)
{
Document document = null;
try
{
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder=factory.newDocumentBuilder();
document=builder.parse(new File(filename));
document.normalize();
}
catch (Exception ex){
ex.printStackTrace();
}
return document;
}
/**
* 演示修改文件的具體某個節點的值
*/
public static void xmlUpdateDemo()
{
Document document = load("c://Message.xml");
Node root=document.getDocumentElement();
/** 如果root有子元素 */
if(root.hasChildNodes())
{
/** ftpnodes */
NodeList ftpnodes = root.getChildNodes();
/** 循環取得ftp所有節點 */
for (int i=0;i<ftpnodes.getLength();i++)
{
NodeList ftplist = ftpnodes.item(i).getChildNodes();
for (int k=0;k<ftplist.getLength();k++)
{
Node subnode = ftplist.item(k);
/** 刪除ftp-chn節點 */
// if (subnode.getNodeType()==Node.ELEMENT_NODE&&subnode.getNodeName()=="ftp-chn")
// {
// ftpnodes.item(i).removeChild(subnode);
// }
/** 修改ftp-host的值為 192.168.0.1 */
if (subnode.getNodeType()==Node.ELEMENT_NODE&&subnode.getNodeName()=="status")
{
subnode.getFirstChild().setNodeValue("1");
}
}

}
}

doc2XmlFile(document,"c://Message.xml");
}
public static void main(String args[])throws Exception
{
UpdateXml.xmlUpdateDemo();
}
}

❹ 如何用Java實現對xml文件的讀取和寫入以及保存

直接附源碼import java.io.FileWriter;
import java.io.IOException;
import java.util.Iterator;import org.dom4j.*;
import org.dom4j.io.XMLWriter;
public class Dom4jSample { public static void main(String[] args) {
Dom4jSample dom4jSample = new Dom4jSample();
Document document = dom4jSample.createDocument();
try{
dom4jSample.FileWrite(document);

Document documentStr = dom4jSample.StringToXML("<China>I Love!</China>");
dom4jSample.XMLWrite(documentStr);

Element legend = dom4jSample.FindElement(document);
System.out.println(legend.getText());
}
catch(Exception e)
{

}
}

/*
* Create a XML Document
*/
public Document createDocument()
{
Document document = DocumentHelper.createDocument();

Element root = document.addElement("root");

Element author1 = root.addElement("Lynch");
author1.addAttribute("Age","25");
author1.addAttribute("Country","China");
author1.addText("I am great!");

Element author2 = root.addElement("Legend");
author2.addAttribute("Age","25");
author2.addAttribute("Country","China");
author2.addText("I am great!too!");

return document;
}

/*
* Create a XML document through String
*/
public Document StringToXML(String str) throws DocumentException
{
Document document = DocumentHelper.parseText(str);
return document;
}
public Element FindElement(Document document)
{
Element root = document.getRootElement();
Element legend = null;
for(Iterator i=root.elementIterator("legend");i.hasNext();)
{
legend = (Element)i.next();
}
return legend;
}

/*
* Write a XML file
*/
public void FileWrite(Document document) throws IOException
{
FileWriter out = new FileWriter("C:/Dom2jSample.xml");
document.write(out);
out.close();
}

/*
* Write a XML format file
*/
public void XMLWrite(Document document) throws IOException
{
XMLWriter writer = new XMLWriter(new FileWriter("C:/Dom2jSampleStr.xml"));
writer.write(document);
writer.close();
}
}