Write a file programatically

How to write a file programatically

//ensure we're in the offline project.
CmsRequestContext cmsContext = cmsObj.getRequestContext();
CmsProject curProject = cmsContext.currentProject();
if(curProject.isOnlineProject()){
      CmsProject offlineProject = cmsObj.readProject("Offline");
      cmsContext.setCurrentProject(offlineProject);
}

byte [] content = your data
List properties = list of CmsProperties 

//get the fixed up filename as shown in CmsNewResourceUpload
String newResname = cmsObj.getRequestContext().getFileTranslator().translateResource(path + filename);

int resTypeId = OpenCms.getResourceManager().getDefaultTypeForName(newResname).getTypeId();

cmsObj.createResource(newResname, resTypeId, content, properties);
cmsObj.unlockResource(newResname);
cmsObj.publishResource(newResname);

You can also try looking at CmsNewResourceUpload.java from the OpenCms sourcecode. It's available from opencms.org via an interactive html browser.