starschartservlet.java

《Java网络程序设计.rar》包括三个网络程序的源代码。

/*
 * StarsChartServlet.java
 *
 * Created on January 27, 2002, 8:03 PM
 */

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

import javax.servlet.*;
import javax.servlet.http.*;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.io.*;
import java.util.*;
import javax.swing.*;

import com.sun.image.codec.jpeg.*;

import com.jrefinery.chart.*;
import com.jrefinery.chart.data.*;
import com.jrefinery.chart.ui.*;
import com.jrefinery.data.*;
import com.jrefinery.ui.*;

import org.impact.stars.control.web.*;
import org.impact.stars.perspectivemd.review.model.ReviewModel;
import org.impact.stars.util.*;
import org.impact.stars.control.exceptions.StarsAppException;

import org.impact.stars.perspectivemd.review.ejb.ReviewLocal;
import org.impact.stars.perspectivemd.review.ejb.ReviewLocalHome;


/**
 *
 * @author  cai
 * @version
 */
public class StarsChartServlet extends HttpServlet {
    
    /** Initializes the servlet.
     */
    ChartGenerator cg;
    
    private ReviewLocalHome pEjbLH;
    
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        cg = new ChartGenerator();
        
        
        try {
            getReviewLocalHome();
        }
        catch (Exception ex) {
            Debug.println(ex.toString());
        }
    }
    /** 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 {
        
        response.setContentType("image/jpeg");
        int type = 1;
        try {
            type = Integer.parseInt(request.getParameter( "type" ));
        }
        catch (Exception e) {
        }
        int  initGradColor= 0;
        int  finalGradColor= 0;
        try {
            initGradColor = Integer.parseInt( request.getParameter( "initGradColor" ) );
            finalGradColor = Integer.parseInt( request.getParameter( "finalGradColor" ) );
        }
        catch (Exception e) {
        }
        
        Number[][] cnumber = new Integer[][] {
            { new Integer(0), new Integer(0), new Integer(0), new Integer(0)},
            { new Integer(0), new Integer(0), new Integer(0), new Integer(0)},
            { new Integer(0), new Integer(0), new Integer(0), new Integer(0)},
            { new Integer(0), new Integer(0), new Integer(0), new Integer(0)},
            { new Integer(0), new Integer(0), new Integer(0), new Integer(0)}
        };
        
        
        Vector reviewvector = null;
        try {
            reviewvector = new Vector();
          //  collectVector(reviewvector, pEjbLH.findByReviewerID("s1"));
          collectVector(reviewvector, pEjbLH.findAll("all"));  
        } catch (javax.ejb.FinderException fde) {
            Debug.println(fde.toString());
        } catch (javax.ejb.NoSuchEntityException nee) {
            Debug.println(nee.toString());
        }

        if (reviewvector !=null) {
            Iterator it = reviewvector.iterator();
            while (it.hasNext()) {
                
                ReviewModel rm = (ReviewModel)it.next();
                String cratio = rm.getConflictRatio();
                float cr = Float.parseFloat(cratio);
                int cgroup = groupConflict(rm.getConceptID());
                
                java.sql.Date rd= rm.getReviewtime();
                
                Calendar cdl = Calendar.getInstance();
                cdl.setTime(rd);
                int month = cdl.get(Calendar.MONTH);
                Debug.println("StarsChartServlet: month " + month + " conflict: " + cr +" group" + cgroup);
                if ((cr>0.5)&& (month<4)) {
                    int current = ((Integer)cnumber[cgroup][month]).intValue();
                    cnumber[cgroup][month] = (Number)(new Integer(current+1));
                }
            }
        }
        
        /*
        String[] names = new String[] {"Technical Decision", "Social Interaction", "Product", "Organization", "Other"};
        //cds.setSeriesNames(names);
        
        String[] cate = new String[] {"Jan", "Feb", "Mar", "April"};
        //cds.setCategories(cate);
        
        DefaultCategoryDataset cds = new DefaultCategoryDataset(names, cate, cnumber);
        */
        DefaultCategoryDataset cds = new DefaultCategoryDataset(cnumber);
        if(cds==null) {
            Debug.println("StarsChartServlet Error: CategoryDataset is null");
        }
         
        cg.setCategoryDataset(cds);
        cg.setChartTitle("Conflict Ratio");
        cg.setXmark("Time");
        cg.setYmark("Intensity");
        
        JFreeChart chart = null;
        try{
            chart = cg.createChart( type, initGradColor, finalGradColor );
        }
        catch (Exception ex) {
            Debug.println(ex.toString());
        }
        if(chart==null) {
            Debug.println("StarsChartServlet Error: chart is null");
        }
        
        int width = 700;
        int height = 500;
        try {
            width = Integer.parseInt( request.getParameter( "width" ) );
            height = Integer.parseInt( request.getParameter( "height" ) );
        }
        catch (Exception e) {
        }
        
        OutputStream out = response.getOutputStream();
        ChartUtilities.writeChartAsJPEG(out, chart, width, height);
        out.close();
        
    }
    
    /** 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 getReviewLocalHome() throws StarsAppException{
        if (pEjbLH == null) {
            //perspectiveEjb = mm.getReviewEJB();
            try {
                ReviewLocalHome phome = EJBUtil.getReviewLocalHome();
                pEjbLH = phome;
            } catch (javax.naming.NamingException nme) {
                Debug.println("ConceptWebImpl naming exception: ");
                throw new StarsAppException("Irrecoverable error while updating perspective : ");
            }
        }
    }
    
    private void collectVector(Vector vector, Collection pclt) {
        if (pclt != null) {
            Iterator itr = pclt.iterator();
            while (itr.hasNext()) {
                ReviewLocal pe = (ReviewLocal)itr.next();
                ReviewModel pml = new ReviewModel(pe.getReviewID(), pe.getPerspectiveID(),
                pe.getConceptID(), pe.getReviewerID(), pe.getReviewtime(),  pe.getConflictRatio(),
                pe.getRpurpose(), pe.getRcontext(), pe.getRcontent(), pe.getOverall());
                vector.add(pml);
            }
        }
        else {
            Debug.println("ReadReviewListServlet: Return null by query");
        }
    }
    
    public  int groupConflict(String conceptID) {
        int concept = Integer.parseInt(conceptID);
        if ((concept<=5)&&(concept>1)) {
            return concept-2;
        }
        else {
            return 4;
        }
    }
}