XML文件：
<?xml version="1.0" encoding="UTF-8"?> <vrvscript>
<item ID="1021" isSelf="n"/>
<item ID="1023" isSelf="n"/>
<item ID="1003" isSelf="n"/>
<item ID="1020" isSelf="n"/>
<item ID="1022" isSelf="n"/>
</vrvscript>
修改属性值：要把每个item元素的“isSelf”属性值修改为“y”
// 获取XML
Document document = XMLUtil.getDocument(xmlPath);
Element root = document.getRootElement(); Iterator<?> ruleNodes = root.elementIterator("item");
while (ruleNodes.hasNext()) {
Element ruleElement = (Element) ruleNodes.next();
// 修改isSelf的属性值
Attribute isSelfAttr = ruleElement.attribute("isSelf");
isSelfAttr.setValue("n");
}
writeXml(document, xmlPath.getPath());
/**
* 输出xml文件
*
* @param document
* @param filePath
* @throws IOException
*/
public static void writeXml(Document document, String filePath) throws IOException {
File xmlFile = new File(filePath);
XMLWriter writer = null;
try {
if (xmlFile.exists())
xmlFile.delete();
writer = new XMLWriter(new FileOutputStream(xmlFile), OutputFormat.createPrettyPrint());
writer.write(document);
writer.close();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (writer != null)
writer.close();
}
}
获取属性值：采用Element类的attributeValue方法
String policyName = root.attributeValue("PolicyName");
给XML元素增加属性
Element ruleElement = root.addElement("item");
ruleElement.addAttribute("ID", "1101");
ruleElement.addAttribute("isSelf", "y");
一些提供一个dom4j操作XML的工具类：
package com.vrv.paw.utils; import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Iterator;
import java.util.Map; import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter; /**
* 操作XML文件的工具类
*
* @author glw
*/
public class XMLUtil {
/**
* 得到XML文档
*
* @param xmlFile
* 文件名（路径）
* @return XML文档对象
* @throws DocumentException
*/
public static Document getDocument(String xmlFile) {
SAXReader reader = new SAXReader();
reader.setEncoding("UTF-8");
File file = new File(xmlFile);
try {
if (!file.exists()) {
return null;
} else {
return reader.read(file);
}
} catch (DocumentException e) {
throw new RuntimeException(e + "->指定文件【" + xmlFile + "】读取错误");
}
} /**
* 得到XML文档(编码格式-gb2312)
*
* @param xmlFile
* 文件名（路径）
* @return XML文档对象
* @throws DocumentException
*/
public static Document getDocument_gb2312(String xmlFile) {
SAXReader reader = new SAXReader();
reader.setEncoding("gb2312");
File file = new File(xmlFile);
try {
if (!file.exists()) {
return null;
} else {
return reader.read(file);
}
} catch (DocumentException e) {
throw new RuntimeException(e + "->指定文件【" + xmlFile + "】读取错误");
}
} public static String getText(Element element) {
try {
return element.getTextTrim();
} catch (Exception e) {
throw new RuntimeException(e + "->指定【" + element.getName() + "】节点读取错误");
} } /**
* 增加xml文件节点
*
* @param document
* xml文档
* @param elementName
* 要增加的元素名称
* @param attributeNames
* 要增加的元素属性
* @param attributeValues
* 要增加的元素属性值
*/
public static Document addElementByName(Document document, String elementName, Map<String, String> attrs, String cdata) {
try {
Element root = document.getRootElement();
Element subElement = root.addElement(elementName);
for (Map.Entry<String, String> attr : attrs.entrySet()) {
subElement.addAttribute(attr.getKey(), attr.getValue());
}
subElement.addCDATA(cdata);
} catch (Exception e) {
throw new RuntimeException(e + "->指定的【" + elementName + "】节点增加出现错误");
}
return document;
} /**
* 删除xml文件节点
*/
@SuppressWarnings("unchecked")
public static Document deleteElementByName(Document document, String elementName) {
Element root = document.getRootElement();
Iterator<Object> iterator = root.elementIterator("file");
while (iterator.hasNext()) {
Element element = (Element) iterator.next();
// 根据属性名获取属性值
Attribute attribute = element.attribute("name");
if (attribute.getValue().equals(elementName)) {
root.remove(element);
document.setRootElement(root);
break;
}
}
return document;
} /**
* 输出xml文件
*
* @param document
* @param filePath
* @throws IOException
*/
public static void writeXml(Document document, String filePath) throws IOException {
File xmlFile = new File(filePath);
XMLWriter writer = null;
try {
if (xmlFile.exists())
xmlFile.delete();
writer = new XMLWriter(new FileOutputStream(xmlFile), OutputFormat.createPrettyPrint());
writer.write(document);
writer.close();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (writer != null)
writer.close();
}
} /**
* 创建Document及根节点
*
* @param rootName
* @param attributeName
* @param attributeVaule
* @return
*/
public static Document createDocument(String rootName, String attributeName, String attributeVaule) {
Document document = null;
try {
document = DocumentHelper.createDocument();
Element root = document.addElement(rootName);
root.addAttribute(attributeName, attributeVaule);
} catch (Exception e) {
throw new RuntimeException(e + "->创建的【" + rootName + "】根节点出现错误");
}
return document;
} /**
* 删除xml文件节点
*/
@SuppressWarnings("unchecked")
public static Document deleteElementAddressByName(Document document, String elementName) {
Element root = document.getRootElement();
Iterator<Object> iterator = root.elementIterator("address");
while (iterator.hasNext()) {
Element element = (Element) iterator.next();
// 根据属性名获取属性值
Attribute attribute = element.attribute("name");
if (attribute.getValue().equals(elementName)) {
root.remove(element);
document.setRootElement(root);
break;
}
}
return document;
} /**
* 删除属性等于某个值的元素
* @param document XML文档
* @param xpath xpath路径表达式
* @param attrName 属性名
* @param attrValue 属性值
* @return
*/
@SuppressWarnings("unchecked")
public static Document deleteElementByAttribute(Document document, String xpath, String attrName, String attrValue) {
Iterator<Object> iterator = document.selectNodes(xpath).iterator();
while (iterator.hasNext()) {
Element element = (Element) iterator.next();
Element parentElement = element.getParent();
// 根据属性名获取属性值
Attribute attribute = element.attribute(attrName);
if (attribute.getValue().equals(attrValue)) {
parentElement.remove(element);
}
}
return document;
}
}