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import javax.xml.transform.*;
import javax.xml.transform.stream.*;
import java.io.*;
import java.util.*;
import java.nio.file.Paths;
import java.nio.file.Files;
import java.nio.charset.StandardCharsets;
import java.nio.charset.Charset;
public class FormatXml{
public static String formatXml(String input, int indent) {
try {
Source xmlInput = new StreamSource(new StringReader(input));
StringWriter stringWriter = new StringWriter();
StreamResult xmlOutput = new StreamResult(stringWriter);
TransformerFactory transformerFactory = TransformerFactory.newInstance();
transformerFactory.setAttribute("indent-number", indent);
Transformer transformer = transformerFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.transform(xmlInput, xmlOutput);
return xmlOutput.getWriter().toString();
} catch (Exception e) {
throw new RuntimeException(e); // simple exception handling, please review it
}
}
public static String prettyFormat(String input) {
return formatXml(input, 2);
}
public static String readFile(String path, Charset encoding)
throws IOException
{
byte[] encoded = Files.readAllBytes(Paths.get(path));
return new String(encoded, encoding);
}
public static void main(String[] args){
try{
if (args != null && args.length != 1){
System.out.println("Usage:java FormatXml xmlStr");
System.exit(-1);
}
String xmlStr = readFile(args[0], StandardCharsets.UTF_8);
System.out.println(prettyFormat(xmlStr));
}catch(Exception e){
e.printStackTrace();
}
}
}
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