readperspectivelistservlet.java

《Java网络程序设计.rar》包括三个网络程序的源代码。

/*
 * ReadPerspectivestrServlet.java
 *
 * Created on October 4, 2001, 5:13 PM
 */

package org.impact.stars.control.web.outputs;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

import java.util.Collection;
import java.util.Vector;
import java.util.Iterator;
import java.util.ArrayList;
import java.sql.Date;
import java.text.ParseException;
import java.text.DateFormat;

import org.impact.stars.control.web.*;
import org.impact.stars.perspectivemd.perspective.model.PerspectiveModel;
import org.impact.stars.util.*;
import org.impact.stars.control.exceptions.StarsAppException;

import org.impact.stars.perspectivemd.perspective.ejb.PerspectiveLocal;
import org.impact.stars.perspectivemd.perspective.ejb.PerspectiveLocalHome;

/**
 *
 * @author  cai
 * @version
 */
public class ReadPerspectiveListServlet extends HttpServlet {
    
    /** Initializes the servlet.
     *
     */
    String defaultcstrID;
    Streamoutput s_output;
    private AppModelManager apmm;
    private PerspectiveLocalHome pEjbLH;
    
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        defaultcstrID = "1";
        s_output = new Streamoutput();
        Debug.println("ReadPerspectivestrServlet: Initializing");
        /*
        apmm = (AppModelManager)getServletContext().getAttribute(WebKeys.AppModelManagerKey);
        if (apmm == null)
        {
            Debug.println("Error: AppModelManger not accessed in ReadPerspectivestrServlet...");
        }*/
        try {
            getPerspectiveLocalHome();
        }
        catch (Exception ex) {
            System.out.println(ex);
        }
        
    }
    
    private void getPerspectiveLocalHome() throws StarsAppException{
        if (pEjbLH == null) {
            //perspectiveEjb = mm.getPerspectiveEJB();
            try {
                PerspectiveLocalHome phome = EJBUtil.getPerspectiveLocalHome();
                pEjbLH = phome;
            } catch (javax.naming.NamingException nme) {
                Debug.println("ConceptWebImpl naming exception: ");
                throw new StarsAppException("Irrecoverable error while updating perspective : ");
            }
        }
    }
    /** Destroys the servlet.
     */
    public void destroy() {
        
    }
    
    /** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, java.io.IOException {
        //System.out.println("in doGet(...)");
        Debug.println("ReadPerspectivestrServlet :");
        String projectID = null;
        projectID = request.getParameter("projectID");
        
        String conceptID = null;
        conceptID = request.getParameter("conceptID");
        
        String stakeholderID = null;
        stakeholderID = request.getParameter("conceptID");
        
        String perspectiveID = null;
        projectID = request.getParameter("perspectiveID");
        
        String declaretime = null;
        projectID = request.getParameter("declaretime");
        
        Vector perspectivevector = null;
        
        if (conceptID != null) {
            try {
                perspectivevector = new Vector();
                collectVector(perspectivevector, pEjbLH.findByConceptID(conceptID));
                s_output.sendObjecttoClient(response, perspectivevector );
            } catch (javax.ejb.FinderException fde) {
                System.out.println(fde);
            } catch (javax.ejb.NoSuchEntityException nee) {
                System.out.println(nee);
            }
            return;
        }
        
        if (stakeholderID != null) {
            try {
                perspectivevector = new Vector();
                collectVector(perspectivevector, pEjbLH.findByStakeholderID(stakeholderID));
                
                s_output.sendObjecttoClient(response, perspectivevector );
            } catch (javax.ejb.FinderException fde) {
                System.out.println(fde);
            } catch (javax.ejb.NoSuchEntityException nee) {
                System.out.println(nee);
            }
            
            return;
        }
        
        if (projectID != null) {
            try {
                
                perspectivevector = new Vector();
                collectVector(perspectivevector, pEjbLH.findByProjectID(projectID));
                
                s_output.sendObjecttoClient(response, perspectivevector );
                
                
            } catch (javax.ejb.FinderException fde) {
                System.out.println(fde);
            } catch (javax.ejb.NoSuchEntityException nee) {
                System.out.println(nee);
            }
            
            
            return;
        }
/*
                                if (perspectiveID != null) {
            perspective = new Vector(pEjbLH.findByPrimaryKey(perspectiveID));
            s_output.sendObjecttoClient(response, perspectivevector );
            return;
        }
 */
        if (declaretime != null) {
            try {
                java.text.DateFormat df = java.text.DateFormat.getDateInstance();
                perspectivevector = new Vector();
                collectVector(perspectivevector, pEjbLH.findByDeclaretime((java.sql.Date)df.parse(declaretime)));
                s_output.sendObjecttoClient(response, perspectivevector );
            } catch (javax.ejb.FinderException fde) {
                System.out.println(fde);
            } catch (javax.ejb.NoSuchEntityException nee) {
                System.out.println(nee);
            } catch (ParseException pex) {
                System.out.println(pex);
            }
            
            return;
        }
        
    }
    
    /** Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, java.io.IOException {
        processRequest(request, response);
    }
    
    /** Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, java.io.IOException {
        processRequest(request, response);
    }
    
    /** Returns a short description of the servlet.
     */
    public String getServletInfo() {
        return "Short description";
    }
    
    private void collectVector(Vector vector, Collection pclt) {
        Iterator itr = pclt.iterator();
        while (itr.hasNext()) {
            PerspectiveLocal psl = (PerspectiveLocal)itr.next();
            PerspectiveModel pml = new PerspectiveModel(psl.getPerspectiveID(), psl.getName(),
            psl.getConceptID(), psl.getStakeholderID(), psl.getDeclaretime(),
            psl.getProjectID(), psl.getPpurpose(), psl.getPcontext(), psl.getPcontent());
            vector.add(pml);
        }
    }
}