imageservlet.java~22~

来自「Java 集成开发实例精解」· JAVA~22~ 代码 · 共 85 行

package cmp2image;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.sql.*;
import javax.naming.*;
import javax.rmi.PortableRemoteObject;

public class ImageServlet
    extends HttpServlet {
  private CatalogHome catalogHome;

  public void init() throws ServletException {
  }
  //Process the HTTP Get request
  public void service(HttpServletRequest request, HttpServletResponse response) throws
        ServletException, IOException {
      Flower flower = null;
      		HttpSession session = request.getSession(true);
      try {
       Context context = getInitialContext();

        //look up jndi name
        Object ref = context.lookup("Catalog");
        //look up jndi name and cast to Home interface
        catalogHome = (CatalogHome) PortableRemoteObject.narrow(ref, CatalogHome.class);

        Catalog catalog = catalogHome.create();
        String str = request.getParameter("pic");
        String name=str.trim();
        ArrayList collection = catalog.findOne(name);
        byte[] buf=null;
        Iterator i = collection.iterator();
        while (i.hasNext()) {
          Object obj = i.next();

          if (obj instanceof byte[]) {
            buf = (byte[]) obj;
          }
        }

        response.getOutputStream().write(buf);
        str = request.getParameter("action");
        String action=str.trim();
       // if (action.equals("all"))

        getServletContext().getRequestDispatcher("/display.jsp").include(request,
            response);

      }
      catch (Exception ex) {
        ex.printStackTrace();
      }

    }
    private Context getInitialContext() throws Exception {
  String url = "t3://localhost:7001";
  String user = null;
  String password = null;
  Properties properties = null;
  try {
    properties = new Properties();
    properties.put(Context.INITIAL_CONTEXT_FACTORY,
                   "weblogic.jndi.WLInitialContextFactory");
    properties.put(Context.PROVIDER_URL, url);
    if (user != null) {
      properties.put(Context.SECURITY_PRINCIPAL, user);
      properties.put(Context.SECURITY_CREDENTIALS,
                     password == null ? "" : password);
    }

    return new InitialContext(properties);
  }
  catch (Exception e) {
    System.out.println("Unable to connect to WebLogic server at " + url);
    System.out.println("Please make sure that the server is running.");
    throw e;
  }
    }
  //Clean up resources
  public void destroy() {
  }
}