如何判断以上xml文件里的节点里没有内容,没有内容则去掉该节点如<XFtp>
<id>89</id>
<name></name>
<serid>asdfasdf</serid>
</XFtp>name节点没有内容 则结果应该是
<XFtp>
<id>89</id>
<serid>asdfasdf</serid>
</XFtp>
方法如下,哪位大哥帮忙补充一下方法体
//参数xml文件内容的字符串
//返回去掉空节点的字符串
public static String removeEmpty(String xml)
{
}
<id>89</id>
<name></name>
<serid>asdfasdf</serid>
</XFtp>name节点没有内容 则结果应该是
<XFtp>
<id>89</id>
<serid>asdfasdf</serid>
</XFtp>
方法如下,哪位大哥帮忙补充一下方法体
//参数xml文件内容的字符串
//返回去掉空节点的字符串
public static String removeEmpty(String xml)
{
}
是字符串或xml文件都无所谓,主要效果达到了就可以了
DocumentBuilderFactory df = DocumentBuilderFactory.newInstance();
Document doc = df.newDocumentBuilder().parse(inputstream);
Element root = doc.getDocumentElement();
NodeList nls = root.getChildNodes();
Node node;
for(int i = nls.getLength() - 1; i >= 0; i--){
node = nls.item(i);
if(!(node instanceof Element)){
root.removeChild(node);
continue;
}
System.out.println(node.getNodeName());
if(node.getFirstChild() == null || node.getFirstChild().getNodeValue() == null || node.getFirstChild().getNodeValue().length() == 0){
root.removeChild(node);
continue;
}
}
ByteArrayOutputStream outBos = new ByteArrayOutputStream();
Transformer transfor = TransformerFactory.newInstance().newTransformer();
transfor.setOutputProperty("version", "1.0");
transfor.setOutputProperty("encoding", "UTF-8");
transfor.transform(new DOMSource(doc), new StreamResult(outBos));
outBos.flush();
System.out.println(outBos.toString());
if (!file.exists()) {
file.createNewFile();
} // 输出流
FileOutputStream outBos = new FileOutputStream(file);
Transformer transfor = null;
try {
transfor = TransformerFactory.newInstance().newTransformer();
transfor.setOutputProperty("version", "1.0");
transfor.setOutputProperty("encoding", "UTF-8");
transfor
.transform(new DOMSource(doc), new StreamResult(outBos));
outBos.flush();
} finally {
outBos.close();
}
public static String removeEmpty(String xml){
String regEx="<\\w*>[ \t\r\n]*</\\w*>"; //表示一个或多个a
Pattern p=Pattern.compile(regEx);
Matcher m=p.matcher(test); String s=m.replaceAll("-Oh yeah!-");
return s;
}
我写了一个,你试试看吧
import java.io.StringReader;
import java.io.StringWriter;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.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;/**
* @author JMSS
*/
public class XMLUtil { public static void main(String... strings) throws Exception {
String source = "<A><AA name=\"1\"></AA><AB>OK</AB><AC><ACA>OK</ACA><ACB></ACB></AC><AD /><AE><![CDATA[]]></AE></A>";
String result = removeEmpty(source);
System.out.println(result);
} public static String removeEmpty(String xml) throws Exception {
StringReader reader = new StringReader(xml);
DocumentBuilderFactory domfac = DocumentBuilderFactory.newInstance();
DocumentBuilder dombuilder = domfac.newDocumentBuilder();
Document doc = dombuilder.parse(new InputSource(reader));
Element root = doc.getDocumentElement();
removeEmprty(root);
DOMSource xmlSource = new DOMSource(doc);
StringWriter writer = new StringWriter();
StreamResult result = new StreamResult(writer);
TransformerFactory tfactory = TransformerFactory.newInstance();
Transformer transformer = tfactory.newTransformer();
// transformer.setOutputProperty("encoding", "UTF-8");
transformer.transform(xmlSource, result);
return writer.toString();
} private static void removeEmprty(Node parent) {
NodeList nodes = parent.getChildNodes();
for (int i = 0; i < nodes.getLength();) {
Node node = nodes.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
if (!node.hasAttributes() && !node.hasChildNodes()) {
parent.removeChild(node);
continue;
} else {
removeEmprty(node);
}
} else if (node.getNodeType() == Node.TEXT_NODE
|| node.getNodeType() == Node.CDATA_SECTION_NODE) {
String value = node.getNodeValue();
// if (value.trim().length() == 0) {
if (value.length() == 0) {
parent.removeChild(node);
continue;
}
}
i++;
}
}}
但如果不考虑注释或CDATA类型,那种方法是最高效的
import java.io.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.stream.*;
import org.w3c.dom.*;
import org.xml.sax.*;/**
* @author JMSS
*/
public class XMLUtil { public static String removeEmpty(String xml) throws Exception {
StringReader reader = new StringReader(xml);
DocumentBuilderFactory domfac = DocumentBuilderFactory.newInstance();
DocumentBuilder dombuilder = domfac.newDocumentBuilder();
Document doc = dombuilder.parse(new InputSource(reader));
Element root = doc.getDocumentElement();
removeEmprty(root);
DOMSource xmlSource = new DOMSource(doc);
StringWriter writer = new StringWriter();
StreamResult result = new StreamResult(writer);
TransformerFactory tfactory = TransformerFactory.newInstance();
Transformer transformer = tfactory.newTransformer();
// transformer.setOutputProperty("version", "1.0");
// transformer.setOutputProperty("encoding", "UTF-8");
transformer.transform(xmlSource, result);
return writer.toString();
} private static void removeEmprty(Node parent) {
NodeList nodes = parent.getChildNodes();
for (int i = 0; i < nodes.getLength();) {
Node node = nodes.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
if (!node.hasAttributes() && !node.hasChildNodes()) {
parent.removeChild(node);
continue;
} else {
removeEmprty(node);
}
} else if (node.getNodeType() == Node.TEXT_NODE
|| node.getNodeType() == Node.CDATA_SECTION_NODE) {
String value = node.getNodeValue();
// if (value.trim().length() == 0) {
if (value.length() == 0) {
parent.removeChild(node);
continue;
}
}
i++;
}
}}