我的属性文件在2 xml个文件中包含名称标记的键值，一个是源文件，另一个是目标文件。
我需要检查属性文件中具有相同值的名称标签是否存在于目标xml中，如果它在那里我不应该做任何事情，如果不存在，则应该迭代源xml文件以搜索名称标签来自属性文件的值。一旦找到相同的名称标签，就应该从source.xml文件添加到destination.xml文件..
请帮我解决这个java代码
private void updateCofigDestn() throws ParserConfigurationException, TransformerConfigurationException, TransformerException, IOException, SAXException {
prop = loadConfigProperties();
String ConfigSrcFile = prop.getProperty("ConfigSourceFile");
String ConfigDesnFile = prop.getProperty("ConfigDestnFile");
System.out.println("\nConfig Destn Path update config :: " + ConfigDesnFile);
File configSrcFile = new File(ConfigSrcFile + "\\config.xml");
File configDstnFile = new File(ConfigDesnFile + "\\config.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
dbFactory.setValidating(false);
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document docSrc = dBuilder.parse(configSrcFile);
Document docDestn = dBuilder.parse(configDstnFile);
Set < Object > keys = getAllKeys();
for (Object k: keys) {
if (k.toString().startsWith("JDBC")) {
System.out.println("Inside Keys");
String key = (String) k;
keyVal = getPropertyValue(key);
System.out.println(key + ": " + getPropertyValue(key));
NodeList listSrc =
docSrc.getElementsByTagName("jdbc-system-resource");
NodeList listDsn =
docDestn.getElementsByTagName("jdbc-system-resource");
System.out.println("listDsn.item(0)" + listDsn.item(0).getTextContent());
if (listDsn.item(0) != null) {
for (int t = 0; t < listDsn.getLength(); t++) {
Element elmntDsn1 = (Element) listDsn.item(t);
String DsNameDsn1 = elmntDsn1.getElementsByTagName("name").item(0).getTextContent();
System.out.println("DS At DESTN in Update Conf " + DsNameDsn1);
if (keyVal.equalsIgnoreCase(DsNameDsn1)) {} else {
for (int temp = 0; temp < listSrc.getLength(); temp++) {
Element elmntSrc = (Element) listSrc.item(temp);
String DsNameSrc = elmntSrc.getElementsByTagName("name").item(0).getTextContent();
// elmntSrc.getElementsByTagName(keyVal).item(0).getTextContent();
// configDestn(keyVal);
//System.out.println("value bool >>>>> " +res ) ;
if (keyVal.equalsIgnoreCase(DsNameSrc) && keyVal != null) {
Node copiedNode = docDestn.importNode(elmntSrc, true);
docDestn.getDocumentElement().appendChild(copiedNode);
System.out.println(" Updating the destination Config File");
TransformerFactory.newInstance().newTransformer().transform(new DOMSource(docDestn),
new StreamResult(new FileWriter(configDstnFile)));
}
}
}
}
} else {
System.out.println("Destination List is null ");
for (int temp = 0; temp < listSrc.getLength(); temp++) {
Element elmntSrc = (Element) listSrc.item(temp);
String elmntValSrc = elmntSrc.getElementsByTagName("name").item(0).getTextContent();
if (keyVal.equalsIgnoreCase(elmntValSrc) &&
keyVal != null) {
Node copiedNode = docDestn.importNode(elmntSrc, true);
docDestn.getDocumentElement().appendChild(copiedNode);
System.out.println(" Updating the destination Config File in NULL");
TransformerFactory.newInstance().newTransformer().transform(new DOMSource(docDestn),
new StreamResult(new FileWriter(configDstnFile)));
}
}
}
}
}
}
对于前..
config.properties
file1 = def
file2 = xyz
file3 = abc
source.xml
<domain>
<node0>
<name>xyz</name>
</node0>
<node1>
<name>abc</name>
</node1>
<node2>
<name>def</name>
</node2>
</domain>
destination.xml
<domain>
<node1>
<name>abc</name>
</node1>
</domain>
Step1：它从属性文件获取文件1'def'的键值并检入destination.xml文件，因为它不存在它会附加它。
Step2：它从属性文件获取文件2'xyz'值的下一个键值并检入destination.xml文件，因为它不存在它将附加它。
Step3：它从属性文件获取文件3'abc'的下一个键值，并检查destination.xml与否，因为它不会附加。
现在destination.xml应该是，
<domain>
<node1>
<name>abc</name>
</node1>
<node0>
<name>xyz</name>
</node0>
<node2>
<name>def</name>
</node2>
</domain>
这是我在JAVA中的要求，我尝试过很多编码。
请帮我解决这个问题..
答案 0 :(得分：0)
你快到了。
你正在做的错误是使用内部3级嵌套for循环，而只需要2级嵌套for循环。
listSrc的for循环应该在destSrc之外。
请尝试以下方法。
package com.tmp;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Map;
import java.util.Properties;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class Tmp {
public static void main( String[] args ) {
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder builder = builderFactory.newDocumentBuilder();
XPath path = XPathFactory.newInstance().newXPath();
Document destDocument = builder.parse( new FileInputStream( "D:\\tmp\\destination.xml" ) );
Document srcDocument = builder.parse( new FileInputStream( "D:\\tmp\\source.xml" ) );
Element destRootEle = destDocument.getDocumentElement();
Element srcRootEle = srcDocument.getDocumentElement();
Properties properties = new Properties();
properties.load( new FileInputStream( "D:\\tmp\\config.properties" ) );
// read properties from config.properties file one by one
for ( Map.Entry<Object, Object> entry : properties.entrySet() ) {
String propVal = (String) entry.getValue();
NodeList destNodeList = (NodeList) path.evaluate( "//name", destRootEle, XPathConstants.NODESET );
boolean destNodeNotExist = true;
// iterate through the destination.xml to check whether property value is exist or not
for ( int i = 0; i < destNodeList.getLength(); i++ ) {
Node node = destNodeList.item( i );
if ( propVal.trim().equals( node.getTextContent().trim() ) ) {
destNodeNotExist = false;
break;
}
}
// if the property value is not found in destination.xml then check for the node in source.xml to add to the destination.xml
if ( destNodeNotExist ) {
NodeList srcNodeList = (NodeList) path.evaluate( "//name", srcRootEle, XPathConstants.NODESET );
for ( int i = 0; i < srcNodeList.getLength(); i++ ) {
Node missingNodeToAdd = srcNodeList.item( i );
if ( propVal.trim().equals( missingNodeToAdd.getTextContent().trim() ) ) {
destRootEle.appendChild( destDocument.adoptNode( missingNodeToAdd.getParentNode() ) );
break;
}
}
}
}
// save the changes made to destination.xml file into file system
Transformer tr = TransformerFactory.newInstance().newTransformer();
tr.setOutputProperty( OutputKeys.INDENT, "yes" );
tr.setOutputProperty( OutputKeys.OMIT_XML_DECLARATION, "yes" );
tr.setOutputProperty( OutputKeys.ENCODING, "UTF-8" );
tr.transform( new DOMSource( destDocument ), new StreamResult( new FileOutputStream( "D:\\tmp\\destination.xml" ) ) );
} catch ( Exception e ) {
e.printStackTrace();
}
}
}