问题
I referred to the following tutorial to create XML file using JAVA. http://www.mkyong.com/java/how-to-create-xml-file-in-java-dom/
However, when I open the xml file, it appears in 1 extremely long single line. This makes it very hard for me to verify the result, and I am sure it is possible to have linebreaks for every element tag. But I do not have any clue how to do that. Please advise. Following is my code:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package ir;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
//##############################################################################################################
public class IR {
public static void main(String[] args) {
IR obj = new IR();
obj.Reader();
}//end main
//##############################################################################################################
public void Reader() {
String csvFile = "TWEETS.csv";
BufferedReader br = null;
String line = "";
String cvsSplitBy = ",";
String[] heading = {}; //The headings (E.g. ID, Message, Link)
String[] content = {};
int counter = 0; //Num of columns
boolean isheading = true; //First line is heading
try
{
//##############################################################################################################
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
// <add> elements
Document doc = docBuilder.newDocument();
Element rootElement = doc.createElement("add");
doc.appendChild(rootElement);
//##############################################################################################################
br = new BufferedReader(new FileReader(csvFile));
while ((line = br.readLine()) != null)
{
//The first line is heading
if(isheading)
{
//The headings (E.g. ID, Message, Link)
heading = line.split(cvsSplitBy);
counter = heading.length; //get number of columns
isheading = false;
continue; //Go to next loop
}else{ //2nd line onwards
content = line.split(cvsSplitBy);
System.out.println("SG News "
+ "[ID= " + content[0]
+ " , FULL_MESSAGE=" + content[1] + "]");
}
//##############################################################################################################
// <doc> elements
Element docEle = doc.createElement("doc");
rootElement.appendChild(docEle);
//Loop according to number of columns
for(int i=0; i<counter; i++)
{
// <field> elements
Element fieldEle = doc.createElement("field");
rootElement.appendChild(fieldEle);
// set attribute to <field> element
Attr attr = doc.createAttribute("name");
attr.setValue(heading[i]);
fieldEle.setAttributeNode(attr);
fieldEle.appendChild(doc.createTextNode(content[i]));
}
//##############################################################################################################
}
//##############################################################################################################
// write the content into xml file
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(new File("TWEETs_solr.xml"));
// Output to console for testing
transformer.transform(source, result);
System.out.println("File saved!");
//##############################################################################################################
}catch (ParserConfigurationException pce) {
pce.printStackTrace();
}catch (TransformerException tfe) {
tfe.printStackTrace();
}catch (FileNotFoundException e) {
e.printStackTrace();
}catch (IOException e) {
e.printStackTrace();
}finally {
if (br != null)
{
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
System.out.println("Done");
}//end Reader
//##############################################################################################################
}//end class
回答1:
You need to add properties to your transformer object. Like this:
Transformer transformer = transformerFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
it should do the trick.
来源：https://stackoverflow.com/questions/22790146/create-xml-file-with-linebreaks