本文介绍了一个用于操作XML文件的Java类XMLEditor。该类提供了加载XML文件、设置节点属性值、设置节点文本内容、添加新节点及删除节点等功能。通过实例演示了如何使用这些方法来修改XML文件。
public class XMLEditor {
private Document doc;
private String fileName;
public XMLEditor() {
// TODO Auto-generated constructor stub
}
public XMLEditor(String fileName) {
try {
// Create a builder factory
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setValidating(false);
// Create the builder and parse the file
doc = factory.newDocumentBuilder().parse(new File(fileName));
// Save file name
this.fileName = fileName;
} catch (SAXException e) {
} catch (ParserConfigurationException e) {
} catch (IOException e) {
}
}
public XMLEditor(InputStream stream) {
try {
// Create a builder factory
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setValidating(false);
// Create the builder and parse the file
doc = factory.newDocumentBuilder().parse(stream);
// Save file name
this.fileName = null;
} catch (Exception e) {
e.printStackTrace();
}
}
public XMLEditor(Document doc) {
try {
// Create the builder and parse the file
this.doc = doc;
// Save file name
this.fileName = null;
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 设置指定节点的属性值
*
* @param xPath 节点路径
* @param attrName 属性名称
* @param attrValue 属性值
*/
public void setNodeAttr(String xPath, String attrName, String attrValue) {
try {
// Get the matching elements
NodeList nodelist = XPathAPI.selectNodeList(doc, xPath);
// Process the elements in the nodelist
for (int i=0; i<nodelist.getLength(); i++) {
// Get element
Element elem = (Element)nodelist.item(i);
elem.setAttribute(attrName, attrValue);
}
// save
save();
} catch (javax.xml.transform.TransformerException e) {
}
}
/**
* 设置节点的文本内容
*
* @param xPath 节点的路径
* @param textValue 节点的文本内容
* @return
*/
public void setNodeText(String xPath, String textValue) {
try {
// Get the matching elements
NodeList nodelist = XPathAPI.selectNodeList(doc, xPath);
// Process the elements in the nodelist
for (int i=0; i<nodelist.getLength(); i++) {
// Get element
Element elem = (Element)nodelist.item(i);
elem.appendChild(doc.createTextNode(textValue));
}
// save
save();
} catch (javax.xml.transform.TransformerException e) {
}
}
/**
* 添加一个新节点
*
* @param xPath 父节点路径
* @param nodeName 新建节点名称
* @param attrMap 属性集合
* @param nodeText 节点包括的文本内容
* @return
*/
public void addChildNode(String xPath, String nodeName, HashMap attrMap, String nodeText) {
try {
// Get the matching elements
NodeList nodelist = XPathAPI.selectNodeList(doc, xPath);
// Process the elements in the nodelist
for (int i=0; i<nodelist.getLength(); i++) {
// Get element
Element elem = (Element)nodelist.item(i);
Element elem1 = doc.createElement(nodeName);
if (attrMap!=null && attrMap.size()>0) {
for (Iterator its=attrMap.keySet().iterator();its.hasNext();) {
String strKey = (String) its.next();
elem1.setAttribute(strKey, attrMap.get(strKey)==null?"":attrMap.get(strKey).toString());
}
}
if (nodeText!=null && nodeText.length()>0) {
Text text = doc.createTextNode(nodeText);
elem1.appendChild(text);
}
elem.appendChild(elem1);
}
// save
save();
} catch (javax.xml.transform.TransformerException e) {
}
}
/**
* 删除指定路径和包括文本的节点
*
* @param xPath 节点的路径
* @param nodeText 节点包括的文本，为null时不判断文本
*/
public void removeChildNode(String xPath, String nodeText) {
try {
NodeList nodelist = XPathAPI.selectNodeList(doc, xPath);
for (int j = 0; j < nodelist.getLength(); j++) {
Node n01 = nodelist.item(j);
if (nodeText!=null) {
Text t01 = (Text) n01.getFirstChild();
if (t01!=null && t01.getData() != null && t01.getData().equals(nodeText)) {
Node parent = n01.getParentNode();
parent.removeChild(n01);
}
} else {
Node parent = n01.getParentNode();
parent.removeChild(n01);
}
}
// save
save();
} catch (javax.xml.transform.TransformerException e) {
}
}
public NodeList getNodeList(String xPath){
try {
return XPathAPI.selectNodeList(doc, xPath);
} catch (javax.xml.transform.TransformerException e) {
}
return null;
}
private void save() {
FileOutputStream fout = null;
try {
// Prepare the DOM document for writing
Source source = new DOMSource(doc);
// Prepare the output file
File file = null;
fileName = null;
if (fileName==null) {
file = File.createTempFile(System.currentTimeMillis()+"", ".xml");
} else {
file = new File(fileName);
}
fout = new FileOutputStream(file);
Result result = new StreamResult(fout); // 要及时关闭输出流
// Write the DOM document to the file
Transformer xformer = TransformerFactory.newInstance().newTransformer();
xformer.transform(source, result);
System.out.println("Save to "+ file.getPath());
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (fout!=null) {
fout.close();
fout=null;
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* @param args
*/
public static void main(String[] args) {
//XMLEditor xe = new XMLEditor("E:/eclipse_all_in_one_2.2.0/workspace_for_birt/org.eclipse.datatools.connectivity.oda.esoon/src/org/eclipse/datatools/connectivity/oda/esoon/impl/xe.xml");
System.out.println("00000000000000000000");
String fileName = "c:/reportModels.xml";
XMLEditor xe = new XMLEditor(fileName);
// xe.setAttribute("/Models/Model", "sqlScript", "9999");
// HashMap map = new HashMap();
// map.put("a1", "a01");
// map.put("a2", "a02");
// map.put("a3", "a03");
// map.put("a4", "a04");
// xe.addChildNode("/Models/Model/Field", "ftt",map,"hello world!");
HashMap map1 = new HashMap();
map1.put("a1", "a01");
map1.put("a2", "a02");
map1.put("a3", "a03");
map1.put("a4", "a04");
xe.removeChildNode("/Models/Model/Field/ftt",null);
System.out.println("11111111111111111111");
}
}
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