Java格式化XML输出

Java格式化输出XML，范例已清晰演示两接口使用。

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.DOMConfiguration;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.bootstrap.DOMImplementationRegistry;
import org.w3c.dom.ls.DOMImplementationLS;
import org.w3c.dom.ls.LSOutput;
import org.w3c.dom.ls.LSSerializer;
import org.xml.sax.InputSource;


public class XmlUtils {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		byte[] data = outPut("test");
		
		if (data != null) {
			try {
				System.out.println(new String(data, "UTF-8"));
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
	}
	
	/**
	 * 格式化XML输出.
	 * @param xmlStr xml文本内容.
	 * @return
	 */
	public static byte[] outPut(String xmlStr) {
		
		byte[] data = null;
		StringReader stringReader = null;
		
		try {
			
	        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
	        DocumentBuilder db = dbf.newDocumentBuilder();
	        stringReader =  new StringReader(xmlStr);
	        InputSource is = new InputSource(stringReader);
	        Document doc = db.parse(is);
	        
	        data = outPut(doc);
			
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			
			if (stringReader != null) {
				stringReader.close();
			}
			
		}
		
		return data;
	}
	
	/**
	 * 格式化输出.
	 * @param node
	 * @return
	 */
	public static byte[] outPut(Node node) {

		ByteArrayOutputStream byteArrayOutputStream = null;
		byte[] data = null;
		
		try {
			DOMImplementationRegistry registry = DOMImplementationRegistry.newInstance();    
	        DOMImplementationLS impl = (DOMImplementationLS) registry.getDOMImplementation("XML 3.0");
	        LSSerializer serializer = impl.createLSSerializer();
	        
	        DOMConfiguration domConfiguration = serializer.getDomConfig();
	        boolean isSupport = domConfiguration.canSetParameter("format-pretty-print", true);
	        if (isSupport) {
	        	domConfiguration.setParameter("format-pretty-print", true);
	        }
	        
	        LSOutput output = impl.createLSOutput();
	        output.setEncoding("UTF-8");
	        byteArrayOutputStream = new ByteArrayOutputStream();
	        output.setByteStream(byteArrayOutputStream);
	        serializer.write(node, output);
	        data = byteArrayOutputStream.toByteArray();
	        
		} catch (Exception e) {
			
			e.printStackTrace();
			
		} finally {
			
			if (byteArrayOutputStream != null) {
				try {
					byteArrayOutputStream.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			
		}
		
		return data;

	}

}