求java读写XML的例子。谢谢。给分100。

seikoo 2004-07-08 01:44:29

要读xml的，和写xml的。
最好有dom，或者Jdom的。
谢谢了。。。

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apple21 2004-07-08

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学习

qsfsea 2004-07-08

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mygia 2004-07-08

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好收藏!

liusoft 2004-07-08

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疯了，狂贴代码！

去下载个Digester (apache-jakarta)

http://www.javayou.com/showlog.jspe?cat_id=-1&log_id=154

http://www.javayou.com (Java自由人)

yiqiangyang 2004-07-08

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public static void main(String argv[])
{
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
document = builder.parse( new File("tag.xml") );

NodeList listProperty = document.getElementsByTagName("tag");
for (int i=0; i< listProperty.getLength(); i++)
{

Node node = listProperty.item(i);
NamedNodeMap attrs = node.getAttributes();
Node attrNode = attrs.item(0);
String attrValue = attrNode.getNodeValue();
if(attrValue.equals("Table"))
{
NodeList childs = node.getChildNodes() ;
for (int j=0; j< childs.getLength(); j++)
{

Node current = childs.item(j);
if(current.getNodeType() == current.ELEMENT_NODE)
{
NamedNodeMap propertyAttrs = current.getAttributes();
Node proprtyattrNode = propertyAttrs.item(0);
String proList = proprtyattrNode.getNodeValue();
System.out.println(proList);
//System.out.print(proprtyattrNode.getNodeValue() +" = ");

Node fisrtchild = current.getFirstChild();
if(fisrtchild != null){
String value = fisrtchild.getNodeValue();
//System.out.println(value);
}
else
System.out.println("no value exists");
}

}

}

}

}

catch (SAXParseException spe) {

// Error generated by the parser
System.out.println("\n** Parsing error"
+ ", line " + spe.getLineNumber()
+ ", uri " + spe.getSystemId());
System.out.println(" " + spe.getMessage() );

// Use the contained exception, if any
Exception x = spe;
if (spe.getException() != null)
x = spe.getException();
x.printStackTrace();

}

catch (SAXException sxe) {

// Error generated during parsing
Exception x = sxe;
if (sxe.getException() != null)
x = sxe.getException();
x.printStackTrace();

}

catch (ParserConfigurationException pce) {

// Parser with specified options can't be built
pce.printStackTrace();

}

catch (IOException ioe) {

// I/O error
ioe.printStackTrace();
}

}// main

/***************************************/
/**
public static void main(String args[]) throws Exception{
DocumentBuilderFactory dof=DocumentBuilderFactory.newInstance();
DocumentBuilder db=dof.newDocumentBuilder();
Document d=db.parse(new File("Tag.xml"));
Element e=d.getDocumentElement();//取根元素webapp
System.out.println(e);
// NodeList nl=e.getElementsByTagName("urlName");//取urlName元素列表
NodeList nl=e.getElementsByTagName("tag");
System.out.println(nl.item(0).getAttributes().getNamedItem("name").getNodeValue());
NodeList nlChild = e.getElementsByTagName("pro");
System.out.println(nlChild.item(0).getAttributes().getNamedItem("name").getNodeValue());

//nl.item(0)取的列表中第一\u9879
// System.out.println(nl);

}
*/
}
里面有你要的方法，呵呵，自己慢慢整理一下把

yiqiangyang 2004-07-08

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package xml;

import javax.xml.parsers.*;
import org.w3c.dom.*;
import java.io.*;
//import java.lang.String;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import java.io.File;
import java.io.IOException;

import org.w3c.dom.*;

public class Xml{
private Element e;
Node[] tagNode;
Node[] proNode;
private String[] tagNameList;
private String[] proNameList;
//set xml's object from xml's name
public void xmlObj(String name) {
try{
DocumentBuilderFactory dof=DocumentBuilderFactory.newInstance();
DocumentBuilder db=dof.newDocumentBuilder();
Document document = db.parse(new File(name));
e = document.getDocumentElement();
}
catch(Exception e){
System.out.println("file's Exception");
}

}

//get xml's object
public Element getElement(){
System.out.println(e);
return e;
}
/**
//set tag's name by tagNode
public void setTag(String eleName){
Element el = getElement();
int length = el.getElementsByTagName(eleName).getLength();
tagNode = new Node[length];
int loop;
for(loop = 0;loop < length;loop++){
tagNode[loop] = el.getElementsByTagName(eleName).item(loop);
System.out.println(tagNode[loop]);
}
}

//get tag's name from tagNode
public Node[] getTag(){

return tagNode;

}
**/

//set tag's name by tagNameList
public void setTagName(String name) {
try{
//this.name = name;
//xml.xmlObj("Tag.xml");
int length = e.getElementsByTagName("tag").getLength();
tagNameList = new String[length];
for(int loop = 0;loop < length;loop++){
tagNameList[loop] = e.getElementsByTagName("tag").item(loop).getAttributes().getNamedItem(name).getNodeValue();
System.out.println(tagNameList[loop]);
}
//for(int step = 0;step<nameList.length;step++)
//System.out.println(nameList[step]);
}
catch(Exception e){
System.out.println(e);
}
}

//get tag's name from tagNameList
public String[] getTagName(){
// System.out.println(nameList[0]);
return tagNameList;

}

// public void setPro(String tagName,String proName){
// setTag(tagName);
// tagNode = getTag();
//tagNode[0].getChildNodes();
// System.out.println(tagNode[2].getAttributes());//getChildNodes().item(2).getOwnerDocument().getElementsByTagName("property").item(6).getNodeName());//.getNodeType());
// }
//public Node getPro(){

//}

//set property's name by proName
public void setPro(String proName){
try{
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse( new File("g:/hyper editor/Tag.xml") );
NodeList listProperty = document.getElementsByTagName("tag");
for (int i=0; i< listProperty.getLength(); i++){
Node node = listProperty.item(i);
NamedNodeMap attrs = node.getAttributes();
Node attrNode = attrs.item(0);
String attrValue = attrNode.getNodeValue();
/////////////!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!///////////
if(attrValue.equals(proName)){
NodeList childs = node.getChildNodes() ;
int a = 0;
for (int j=0; j< childs.getLength(); j++){
Node current = childs.item(j);
if(current.getNodeType() == current.ELEMENT_NODE){
NamedNodeMap propertyAttrs = current.getAttributes();
Node proprtyattrNode = propertyAttrs.item(0);
//String proList = proprtyattrNode.getNodeValue();
String[] proList = new String[100];
for(int loop = 0;loop < proList.length; loop ++)
proList[loop] = proprtyattrNode.getNodeValue();
//proListName[0] = proList;
// System.out.println(proList);
//System.out.print(proprtyattrNode.getNodeValue() +" = ");

Node fisrtchild = current.getFirstChild();
if(fisrtchild != null){
String value = fisrtchild.getNodeValue();
//System.out.println(value);
}
// else
// System.out.println("no value exists");
if(proList != null){

System.out.println(proList[4]);
//proListName[loop++] = proList;
//System.out.println(proListName[loop++]);
}
}
}
}
}

}
catch (SAXParseException spe) {

// Error generated by the parser
System.out.println("\n** Parsing error"
+ ", line " + spe.getLineNumber()
+ ", uri " + spe.getSystemId());
System.out.println(" " + spe.getMessage() );

// Use the contained exception, if any
Exception x = spe;
if (spe.getException() != null)
x = spe.getException();
x.printStackTrace();

}

catch (SAXException sxe) {

// Error generated during parsing
Exception x = sxe;
if (sxe.getException() != null)
x = sxe.getException();
x.printStackTrace();

}

catch (ParserConfigurationException pce) {

// Parser with specified options can't be built
pce.printStackTrace();

}

catch (IOException ioe) {

// I/O error
ioe.printStackTrace();
}

}

//get property's name from tag's name
public String getPro(){
// System.out.println(proListName[1]);
// return proListName;
return "hehehehhehehe";
}

public static void main(String args[]) throws Exception{
Xml xml = new Xml();
xml.xmlObj("g:/hyper editor/Tag.xml");
//xml.getElement();
xml.setTagName("name");
xml.getTagName();
//xml.setPro("tag","name");
xml.setPro("Table");
}

/** thinking
static Document document;

mail25 2004-07-08

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上面有些不适合的地方,就跳过吧!

mail25 2004-07-08

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下面这是个写XML的,不过是基于GUI的,道理是一样嘛!
===============================================
要导入
import javax.xml.parsers.*;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
才行
private void saveData(){
String DES ;
try{
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.newDocument();
// Create DOM Tree
Element root = document.createElement("AimsLicense");
document.appendChild(root);
Element Company = document.createElement("Company");
Element ComInfo = document.createElement("ComInfo");
Element UseInfo = document.createElement("UseInfo");
Element OthInfo = document.createElement("OthInfo");
root.appendChild(Company);
Element NameLong = document.createElement("NameLong");
Element NameShort = document.createElement("NameShort");
Element Location = document.createElement("Location");
Element Address = document.createElement("Address");
Element TermDate = document.createElement("TermDate");
Element Contact = document.createElement("Contact");
Element ContactMail = document.createElement("ContactMail");
Element IssueDate = document.createElement("IssueDate");
Element UserNum = document.createElement("UserNum");
Element PassDue = document.createElement("PassDue");
Element LicEnc = document.createElement("LicEnc");
Element SoftwareName = document.createElement("SoftwareName");
Element ComponentName = document.createElement("ComponentName");
Element SoftekMail = document.createElement("SoftekMail");

Company.appendChild(ComInfo);
Company.appendChild(UseInfo);
Company.appendChild(OthInfo);

ComInfo.appendChild(NameLong);
ComInfo.appendChild(NameShort);
ComInfo.appendChild(Location);
ComInfo.appendChild(Address);

UseInfo.appendChild(Contact);
UseInfo.appendChild(ContactMail);
UseInfo.appendChild(TermDate);
UseInfo.appendChild(IssueDate);
UseInfo.appendChild(UserNum);
UseInfo.appendChild(PassDue);

OthInfo.appendChild(SoftwareName);
OthInfo.appendChild(ComponentName);
OthInfo.appendChild(SoftekMail);
OthInfo.appendChild(LicEnc);

DES = LicenseAdmin.getInstance().LicenseEnc(txtLong.getText()+txtTerm.getText()+txtUser.getText()+txtPass.getText()+txtSoftek.getText()+txtSoft.getText()+txtCompo.getText());

NameLong.appendChild(document.createTextNode(txtLong.getText()));
NameShort.appendChild(document.createTextNode(txtShort.getText()));
Location.appendChild(document.createTextNode(txtLocation.getText()));
Address.appendChild(document.createTextNode(txtAddress.getText()));
Contact.appendChild(document.createTextNode(txtContact.getText()));
ContactMail.appendChild(document.createTextNode(txtContactMail.getText()));
TermDate.appendChild(document.createTextNode(txtTerm.getText()));
IssueDate.appendChild(document.createTextNode(txtIssue.getText()));
UserNum.appendChild(document.createTextNode(txtUser.getText()));
PassDue.appendChild(document.createTextNode(txtPass.getText()));
SoftwareName.appendChild(document.createTextNode(txtSoft.getText()));
ComponentName.appendChild(document.createTextNode(txtCompo.getText()));
SoftekMail.appendChild(document.createTextNode(txtSoftek.getText()));

LicEnc.appendChild(document.createCDATASection(DES));

if(LicenseAdmin.getInstance().generateLicXML(document)){
JOptionPane.showConfirmDialog(this, "生成License文件成功,请查看!", "提示信息",
JOptionPane.DEFAULT_OPTION,
JOptionPane.INFORMATION_MESSAGE);
}else{
JOptionPane.showConfirmDialog(this, "生成License文件失败,请查看!", "错误信息",
JOptionPane.DEFAULT_OPTION,
JOptionPane.WARNING_MESSAGE);
}

}catch(Exception e){ e.printStackTrace(); }

}

====================================
读的方法在这
private DocumentBuilderFactory factory;
private DocumentBuilder builder;
private Document doc;
private int Days;

private static final String BASEDIR="app.basedir";//web.xml中指定了初始化目录的地址,也可以用String

指定,不用Properties属性
private static final String SEPARATOR="file.separator";//不同操作系统中的分隔符

private String file_uri = "";

Properties properties = System.getProperties();
String separator = properties.getProperty(SEPARATOR);
file_uri = softeksystem.com.PropertyMgr.getInstance().getProperty(BASEDIR);
file_uri = file_uri.concat("AimsLicense.xml");
try {
factory = DocumentBuilderFactory.newInstance();
builder = factory.newDocumentBuilder();
doc = builder.parse(file_uri);//这个doc可以取代上面新产生的那个,做为读入的,然后可以进行相应的修改,上面是的GUI用的!
有点乱,不知道能看明白了!
}catch(Ex

mail25 2004-07-08