Including structure form in our custom portlet

Step 1: Create a structure in portal.

To know how to create structure :
http://liferayplanet.blogspot.in/2015/01/structure-and-template-in-liferay-62.html

Step 2: Then in your jsp page

long structureId= 12345;
ServiceContext serviceContext = ServiceContextFactory.getInstance(request);
DDMStructure ddm = null;
ddm = DDMStructureLocalServiceUtil.getDDMStructure(structureId);
Fields newFields = DDMUtil.getFields(
ddm.getStructureId(), serviceContext);

 Here we get ddmstructure and we will use DDMUtil.getFields to get all the form fields.

Step 3:Then use the below tag
<%@ taglib uri="http://liferay.com/tld/ddm" prefix="liferay-ddm"%>
<liferay-ddm:html
classNameId="<%= PortalUtil.getClassNameId(DDMStructure.class)%>"
classPK="<%= ddm.getStructureId() %>"
fields="<%= newFields %>"
/>

Step 4:Then to get in controller use

               ServiceContext serviceContext;
DDMStructure ddmStructure = null;

serviceContext = ServiceContextFactory.getInstance(
JournalArticle.class.getName(), actionRequest);
Object[] contentAndImages = null;

ddmStructure = DDMStructureLocalServiceUtil
.getDDMStructure(structureId);
Locale locale = LocaleUtil.getDefault();

contentAndImages =  getContentAndImages(
ddmStructure, locale, serviceContext);
content = (String) contentAndImages[0];

            public static Object[] getContentAndImages(
DDMStructure ddmStructure, Locale locale,
ServiceContext serviceContext)
throws Exception {

Fields fields = DDMUtil.getFields(
ddmStructure.getStructureId(), serviceContext);


Map<String, byte[]> images = getImages(fields, locale);

return new Object[] {
JournalConverterUtil.getContent(ddmStructure, fields), images
};
}
protected static Map<String, byte[]> getImages(Fields fields, Locale locale)
throws Exception {

Map<String, byte[]> images = new HashMap<String, byte[]>();

for (Field field : fields) {
String dataType = field.getDataType();

if (!dataType.equals(FieldConstants.IMAGE)) {
continue;
}

List<Serializable> values = field.getValues(locale);

for (int i = 0; i < values.size(); i++) {
String content = (String)values.get(i);

if (content.equals("update")) {
continue;
}

StringBundler sb = new StringBundler(6);

sb.append(StringPool.UNDERLINE);
sb.append(field.getName());
sb.append(StringPool.UNDERLINE);
sb.append(i);
sb.append(StringPool.UNDERLINE);
sb.append(LanguageUtil.getLanguageId(locale));

images.put(sb.toString(), UnicodeFormatter.hexToBytes(content));
}
}

return images;
}