graphicsservlet.java

esri的ArcGIS Server超级学习模板程序（for java）

package com.esri.solutions.jitk.web.tasks.redlining.graphics;

import javax.faces.FactoryFinder;
import javax.faces.context.FacesContext;
import javax.faces.context.FacesContextFactory;
import javax.faces.lifecycle.LifecycleFactory;
import javax.faces.lifecycle.Lifecycle;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletOutputStream;
import java.text.DateFormat;
import java.util.Date;
import java.io.FileOutputStream;
import java.io.File;


/**
 * This servlet returns requested uploaded graphics.
 */
public class GraphicsServlet extends HttpServlet{    
	private static final long serialVersionUID = 9208915312769835525L;

	public void init(ServletConfig config) throws ServletException{
        super.init(config);
    }

	@SuppressWarnings("unchecked")
	public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException{
    	try{
			String id = request.getParameter("id");
			String filename = request.getParameter("filename");
			String fullpath = request.getParameter("fullpath");
			String fid = request.getParameter("fid");
			String mode = request.getParameter("mode");
			FacesContext facesContext = FacesContext.getCurrentInstance();
			
			if (facesContext == null){
				FacesContextFactory contextFactory = (FacesContextFactory)FactoryFinder.getFactory(FactoryFinder.FACES_CONTEXT_FACTORY);
				LifecycleFactory lifecycleFactory = (LifecycleFactory)FactoryFinder.getFactory(FactoryFinder.LIFECYCLE_FACTORY);
				Lifecycle lifecycle = lifecycleFactory.getLifecycle(LifecycleFactory.DEFAULT_LIFECYCLE);

				facesContext = contextFactory.getFacesContext(request.getSession().getServletContext(), request, response, lifecycle);
			}
			
			byte[] data = null;
			if (id != null) {
				data = (byte[])facesContext.getExternalContext().getSessionMap().get(id);
			}
			
			if (filename != null){
				String fileId = id + "_" + filename;
				
				if (filename.toUpperCase().endsWith(".ICO")) {
					String dstr = DateFormat.getDateTimeInstance().format(new Date());
					String pngfilename = dstr.replaceAll(" ", "_");
					pngfilename = "jitk_" + id + "_" + pngfilename.replaceAll(":", "_") + ".ico";
					FileOutputStream fos = new FileOutputStream(pngfilename);
					fos.write(data, 0, data.length);
					fos.close();
					data = GraphicsRedliningTaskUtil.getBytesFromFile(pngfilename, fid);
					facesContext.getExternalContext().getSessionMap().put(fileId, data);
					File pngfile = new File(pngfilename);
					pngfile.delete();
				}
				else {
					facesContext.getExternalContext().getSessionMap().put(fileId, data);
				}
			}
			
			if (mode != null && mode.equalsIgnoreCase("checksize")) {
				String heightParam = (String)facesContext.getExternalContext().getSessionMap().get("jitkGraphicsHeightParam");
				String widthParam = (String)facesContext.getExternalContext().getSessionMap().get("jitkGraphicsWidthParam");
				String sizeParam = (String)facesContext.getExternalContext().getSessionMap().get("jitkGraphicsSizeParam");

				String msg = GraphicsRedliningTaskUtil.checkSize(data, Integer.parseInt(widthParam), Integer.parseInt(heightParam), Integer.parseInt(sizeParam));
				ServletOutputStream out = response.getOutputStream();
				out.write(msg.getBytes());
				out.flush();
				out.close();
				return;
			}
			
			if (fullpath != null){
				data = GraphicsRedliningTaskUtil.getBytesFromFile(fullpath, fid);
			}
			
//			response.setContentType(CONTENT_TYPE);
			ServletOutputStream out = response.getOutputStream();
			out.write(data);
			out.flush();
			out.close();
		}
    	catch (Exception e) {
			e.printStackTrace();
		}
    }
}