java修改xml代码 java设置xml文件编码格式
求一段 修改 xml文件的java代码
主要是这几个包：
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javax.xml.parsers
javax.xml.transform
javax.xml.transform.dom.DOMSource
javax.xml.transform.stream.StreamResult
org.w3c.dom
import java.io.*;
import java.util.*;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import tools.Vote;//自己的类
//载入
private DocumentBuilderFactory dbf=null;
private DocumentBuilder db=null;
private Document doc=null;
private List listXml=null;
public Document loadXml(File file)
{
try
{
dbf=DocumentBuilderFactory.newInstance();
db=dbf.newDocumentBuilder();
doc=db.parse(file);
}
catch(Exception e)
{
e.printStackTrace();
}
return doc;
}
// 添加节点
public void addOptionXmlData(File file,int parentPos,String option)
{
if(doc==null){
doc=loadXml(file);
}
try
{
Element root=doc.getDocumentElement();
Element voot=(Element)root.getElementsByTagName("vote").item(parentPos);
Element optionNode=doc.createElement("option");
voot.appendChild(optionNode);
optionNode.setTextContent(option);
optionNode.setAttribute("sum", "0");
}catch(Exception ex){
ex.printStackTrace();
}
try//保存到XML文件
{
TransformerFactory tf=TransformerFactory.newInstance();
Transformer t=tf.newTransformer();
Properties props=t.getOutputProperties();
props.setProperty(OutputKeys.ENCODING, "gb2312");
t.setOutputProperties(props);
DOMSource dom=new DOMSource(doc);
StreamResult sr=new StreamResult(file);
t.transform(dom, sr);
}catch(Exception ex)
{
ex.printStackTrace();
}
}
java修改XMl文件，请高手指点
楼主这个思路是没有什么问题的，存入map中可以方便整个项目使用，特别是针对那些项目中经常要读取的xml,可以使用xpath
public static void modifyXMLFile(String name,String value) {
String oldStr = "E:/Work/Proj/gfweb/src/configuration.xml";
String newStr = "E:/Work/Proj/gfweb/src/configuration.xml";
Document document = null;
try {
SAXReader saxReader = new SAXReader(); // 用来读取xml文档
saxReader.setEncoding("GBK");
document = saxReader.read(new File(oldStr)); // 读取xml文档
List list = document.selectNodes("/system/category/item");// 用xpath查找节点book的属性
Iterator iter = list.iterator();
while (iter.hasNext()) {
Element element = (Element) iter.next();
//Attribute attribute = (Attribute) iter.next();
String itemname = element.attributeValue("name");
if(name.equals(itemname)){
element.setAttributeValue("value",value);
}
}
} catch (Exception e) {
e.printStackTrace();
}
try {
OutputFormat outFmt = OutputFormat.createPrettyPrint();
outFmt.setEncoding("GBK");
outFmt.setIndent(true);
XMLWriter writer = new XMLWriter(new FileWriter(new File(newStr)),outFmt);
writer.write(document);
writer.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
求一段 读出\修改 xml文件的java代码
javax.xml.parsers
javax.xml.transform
javax.xml.transform.dom.DOMSource
javax.xml.transform.stream.StreamResult
org.w3c.dom
测试的时候写的一个完整的操作XML的类，检测的投票系统
package tools;
import java.io.*;
import java.util.*;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import tools.Vote;
public class XmlHandler {
private DocumentBuilderFactory dbf=null;
private DocumentBuilder db=null;
private Document doc=null;
private List listXml=null;
public Document loadXml(File file)
{
try
{
dbf=DocumentBuilderFactory.newInstance();
db=dbf.newDocumentBuilder();
doc=db.parse(file);
}
catch(Exception e)
{
e.printStackTrace();
}
return doc;
}
public List getXmlData(File file)
{
if(doc==null){
doc=loadXml(file);
}
listXml=new ArrayList();
Element root=doc.getDocumentElement();//得到根节点votes
NodeList votes=root.getElementsByTagName("vote");//得到vote节点的集合
for(int i=0;ivotes.getLength();i++)
{
Vote form=new Vote();
Element vote=(Element)votes.item(i);
form.setId(vote.getAttribute("id"));
form.setSum(vote.getAttribute("sum"));
form.setTitle(vote.getAttribute("title"));
form.setTime(vote.getAttribute("time"));
NodeList options=vote.getElementsByTagName("option");
String[] sums=new String[options.getLength()];//存储vote下每个option的sum
String[] opts=new String[options.getLength()];//存储vote下每个option的text
for(int k=0;koptions.getLength();k++)
{
Element option=(Element)options.item(k);
sums[k]=option.getAttribute("sum");
opts[k]=option.getTextContent();
}
form.setSums(sums);
form.setOptions(opts);
listXml.add(form);
}
return listXml;
}
public void modifyXmlData(File file,int parentPos,int childPos)
{
if(doc==null){
doc=loadXml(file);
}
try{
Element root=doc.getDocumentElement();
NodeList votes=root.getElementsByTagName("vote");
Element vote=(Element)votes.item(parentPos);
int sum=Integer.parseInt(vote.getAttribute("sum"))+1;
//System.out.println(sum);
//vote.removeAttribute("sum");
vote.setAttribute("sum", String.valueOf(sum));
NodeList options=vote.getElementsByTagName("option");
//System.out.println(options.getLength());
Element option=(Element)options.item(childPos);
int opt_sum=Integer.parseInt(option.getAttribute("sum"))+1;
//option.removeAttribute("sum");
option.setAttribute("sum", String.valueOf(opt_sum));
}
catch(Exception e)
{
e.printStackTrace();
}
try//保存到XML文件
{
TransformerFactory tf=TransformerFactory.newInstance();
Transformer t=tf.newTransformer();
Properties props=t.getOutputProperties();
props.setProperty(OutputKeys.ENCODING, "gb2312");
t.setOutputProperties(props);
DOMSource dom=new DOMSource(doc);
StreamResult sr=new StreamResult(file);
t.transform(dom, sr);
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
public void deleteXmlData(File file,int parentPos,int childPos)//注：该方法不支持批量删除，批量删除可用split分割位置
{
if(doc==null)
{
doc=loadXml(file);
}
try
{
boolean flag;
if(childPos==-1)
{
flag=true;//删除父节点
}else{
flag=false;//删除子节点
}
Element root=doc.getDocumentElement();
Element vote=(Element)root.getElementsByTagName("vote").item(parentPos);
if(flag)//对父节点vote进行删除
{
root.removeChild(vote);
}else if(!flag)
{
Element option=(Element)vote.getElementsByTagName("option").item(childPos);
vote.setAttribute("sum", String.valueOf(Integer.parseInt(vote.getAttribute("sum"))-Integer.parseInt(option.getAttribute("sum"))));
vote.removeChild(option);
}
}
catch(Exception e)
{
e.printStackTrace();
}
try
{
TransformerFactory tf=TransformerFactory.newInstance();
Transformer t=tf.newTransformer();
Properties props=t.getOutputProperties();
props.setProperty(OutputKeys.ENCODING, "gb2312");
t.setOutputProperties(props);
DOMSource ds=new DOMSource(doc);
StreamResult sr=new StreamResult(file);
t.transform(ds, sr);
}
catch(Exception e)
{
e.printStackTrace();
}
}
public void appendXmlData(File file,String title,String[] options)
{
if(doc==null)
{
doc=loadXml(file);
}
try
{
Element root=doc.getDocumentElement();
Element vote=doc.createElement("vote");
root.appendChild(vote);
vote.setAttribute("time", new Date().toLocaleString());
vote.setAttribute("id", String.valueOf(root.getElementsByTagName("vote").getLength()));
vote.setAttribute("sum", "0");
vote.setAttribute("title", title);
for(int i=0;ioptions.length;i++)
{
Element option=doc.createElement("option");
vote.appendChild(option);
option.setAttribute("sum", "0");
option.setTextContent(options[i]);
}
}
catch(Exception ex){
ex.printStackTrace();
}
try{
TransformerFactory tf=TransformerFactory.newInstance();
Transformer t=tf.newTransformer();
Properties props=t.getOutputProperties();
props.setProperty(OutputKeys.ENCODING, "gb2312");
t.setOutputProperties(props);
DOMSource dom=new DOMSource(doc);
StreamResult sr=new StreamResult(file);
t.transform(dom, sr);
}catch(Exception ex){
ex.printStackTrace();
}
}
public Vote selectSingleOne(File file,int parentPos)
{
if(doc==null)
{
doc=loadXml(file);
}
Element root=doc.getDocumentElement();
Element vote=(Element)root.getElementsByTagName("vote").item(parentPos);
Vote form=new Vote();
form.setId(vote.getAttribute("id"));
form.setTime(vote.getAttribute("time"));
form.setTitle(vote.getAttribute("title"));
form.setSum(vote.getAttribute("sum"));
int len=vote.getElementsByTagName("option").getLength();
NodeList nodeList=vote.getElementsByTagName("option");
String[] sums=new String[len];
String[] opts=new String[len];
for(int i=0;ilen;i++)
{
Element option=(Element)nodeList.item(i);
sums[i]=option.getAttribute("sum");
opts[i]=option.getTextContent();
}
form.setOptions(opts);
form.setSums(sums);
return form;
}
public void modifyOneXmlData(File file,int parentPos,String title,String[] options)
{
if(doc==null){
doc=loadXml(file);
}
try
{
Element root=doc.getDocumentElement();
Element vote=(Element)root.getElementsByTagName("vote").item(parentPos);
vote.setAttribute("title", title);
vote.setAttribute("sum", "0");
int len=vote.getElementsByTagName("option").getLength();
for(int i=0;ilen;i++)
{
Element option=(Element)vote.getElementsByTagName("option").item(i);
option.setAttribute("sum", "0");
option.setTextContent(options[i]);
}
}catch(Exception ex){
ex.printStackTrace();
}
try
{
TransformerFactory tf=TransformerFactory.newInstance();
Transformer t=tf.newTransformer();
Properties props=t.getOutputProperties();
props.setProperty(OutputKeys.ENCODING, "gb2312");
t.setOutputProperties(props);
DOMSource dom=new DOMSource(doc);
StreamResult sr=new StreamResult(file);
t.transform(dom, sr);
}catch(Exception ex){
ex.printStackTrace();
}
}
public void addOptionXmlData(File file,int parentPos,String option)
{
if(doc==null){
doc=loadXml(file);
}
try
{
Element root=doc.getDocumentElement();
Element voot=(Element)root.getElementsByTagName("vote").item(parentPos);
Element optionNode=doc.createElement("option");
voot.appendChild(optionNode);
optionNode.setTextContent(option);
optionNode.setAttribute("sum", "0");
}catch(Exception ex){
ex.printStackTrace();
}
try
{
TransformerFactory tf=TransformerFactory.newInstance();
Transformer t=tf.newTransformer();
Properties props=t.getOutputProperties();
props.setProperty(OutputKeys.ENCODING, "gb2312");
t.setOutputProperties(props);
DOMSource dom=new DOMSource(doc);
StreamResult sr=new StreamResult(file);
t.transform(dom, sr);
}catch(Exception ex)
{
ex.printStackTrace();
}
}
}
java修改xml文档
最好还是自己写，我这里有个xml处理类 你自己看着写吧， 给个邮箱
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