java xml 格式化输出

import java.io.FileReader;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import org.dom4j.Document;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public static String formatXML_str(String inputXMLString) throws Exception
{
SAXReader reader = new SAXReader();
Document document = reader.read(new StringReader(inputXMLString));
String requestXML = null;
XMLWriter writer = null;
if (document != null)
{
try
{
StringWriter stringWriter = new StringWriter();
OutputFormat format = OutputFormat.createPrettyPrint();
writer = new XMLWriter(stringWriter, format);
writer.write(document);
writer.flush();
requestXML = stringWriter.getBuffer().toString();
}
finally
{
if (writer != null)
{
try
{
writer.close();
}
catch (IOException e)
{
}
}
}
}
return requestXML;
}

public static String formatXML_file(String inputXML_URL) throws Exception
{
SAXReader reader = new SAXReader();
Document document = reader.read(new FileReader(inputXML_URL));
String requestXML = null;
XMLWriter writer = null;
if (document != null)
{
try
{
StringWriter stringWriter = new StringWriter();
OutputFormat format = OutputFormat.createPrettyPrint();
writer = new XMLWriter(stringWriter, format);
writer.write(document);
writer.flush();
requestXML = stringWriter.getBuffer().toString();
}
finally
{
if (writer != null)
{
try
{
writer.close();
}
catch (IOException e)
{
}
}
}
}
return requestXML;
}