HTTP로 XML 보내기 및 결과 XML 예쁘게 보여주기

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import java.io.File;
import java.io.InputStream;
import java.io.StringWriter;

import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.FileRequestEntity;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;
import org.w3c.dom.Document;

import org.apache.xml.serialize.OutputFormat;
import org.apache.xml.serialize.XMLSerializer;

/**
 *
 * This is a sample application that demonstrates how to use the Jakarta
 * HttpClient API.
 *
 * This application sends an XML document to a remote web server using HTTP POST
 *
 * @author Sean C. Sullivan
 * @author Ortwin Glueck
 * @author Oleg Kalnichevski
 * @author Paul King
 */
public class PostSOAP {

  /**
   *
   * Usage: java PostSOAP http://mywebserver:80/ SOAPAction c:\foo.xml
   *
   * @param args
   *            command line arguments Argument 0 is a URL to a web server
   *            Argument 1 is the SOAP Action Argument 2 is a local filename
   *
   */
  public static void main(String[] args) throws Exception {
    boolean isBeautify = false;

    if (args.length != 3 && args.length != 2) {
      System.out.print("Usage: java -classpath <classpath> [-Dorg.apache.");
      System.out.print("commons.logging.simplelog.defaultlog=<loglevel>] Post");
      System.out.print("SOAP <url> <filename> [<soapaction>] [-beautify]\n");
      System.out.print("<classpath> - must contain the commons-httpclient.jar");
      System.out.print(" and commons-logging.jar\n");
      System.out.print("<loglevel> - one of error, warn, info, debug, trace\n");
      System.out.print("<url> - the URL to post the file to\n");
      System.out.print("<filename> - file to post to the URL\n");
      System.out.print("<soapaction> - the SOAP action header value");
      System.out.print("(optional)\n");
      System.out.println("-beautify - show pretty result(optional)\n\n");
      System.exit(1);
    }
    // Get target URL
    String strURL = args[0];
    String strSoapAction = "";

    if (4 == args.length) {
      // Get SOAP action
      strSoapAction = args[2];

      if ("-beautify".equals(args[3])) {
        isBeautify = true;
      }
    }

    if (3 == args.length) {
      if ("-beautify".equals(args[2])) {
        isBeautify = true;
      } else {
        strSoapAction = args[2];
      }
    }


    // Get file to be posted
    String strXMLFilename = args[1];
    File input = new File(strXMLFilename);
    // Prepare HTTP post
    PostMethod post = new PostMethod(strURL);
    // Request content will be retrieved directly
    // from the input stream
    RequestEntity entity = new FileRequestEntity(input,
        "text/xml; charset=ISO-8859-1");
    post.setRequestEntity(entity);
    // consult documentation for your web service
    post.setRequestHeader("SOAPAction", strSoapAction);
    // Get HTTP client
    HttpClient httpclient = new HttpClient();
    // Execute request
    try {
      int result = httpclient.executeMethod(post);
      // Display status code
      System.out.println("Response status code: " + result);
      // Display response
      System.out.println("Response body: ");

      if (isBeautify) {
        System.out.println(PostSOAP.beautify(post
            .getResponseBodyAsStream()));
      } else {
        System.out.println(post.getResponseBodyAsString());
      }
    } finally {
      // Release current connection to the connection pool once you are done
      post.releaseConnection();
    }
  }

  public static String beautify(InputStream response) {
    StringWriter sFormattedXML = new StringWriter();

    try {
      Document oDocument = DocumentBuilderFactory.newInstance()
          .newDocumentBuilder().parse(response);
      OutputFormat format = new OutputFormat(oDocument, "UTF-8", true);
      format.setIndent(4);
      format.setIndenting(true);
      format.setPreserveSpace(false);

      XMLSerializer serial = new XMLSerializer(sFormattedXML, format);
      serial.asDOMSerializer();
      serial.serialize(oDocument.getDocumentElement());
    } catch (Exception e) {
      e.printStackTrace();
    }

    return sFormattedXML.toString();
  }
}

Apache HTTP Client의 예제 중 하나인 PostSOAP에 XML을 예쁘게 보여주는 beautify(InputStream) method를 추가했습니다. 참고로

import org.apache.xml.serialize.OutputFormat;
import org.apache.xml.serialize.XMLSerializer;

이 두 import문에서의 OutputFormat, XMLSerializer의 package 이름은 IBM JDK 1.5(J9 VM이라고도 하죠)에 들어있는 Xerces의 OutputFormat이나 XMLSerializer의 package 이름을 따른 것입니다. 흔히들 많이 쓰는 Sun JDK의 Xerces는 package 구조를 Sun이 손을 댄 통에 package 이름이 다릅니다. 따라서 Sun JDK에서는 위 import문을 아래와 같이 바꾸세요.

import com.sun.org.apache.xml.internal.serialize.OutputFormat;
import com.sun.org.apache.xml.internal.serialize.XMLSerializer;