getprocessdefinitionimage.java

本人写的一个jbpm的报销流程

package com.bhsoft.baoxiao;
import org.jbpm.JbpmContext;
import org.jbpm.JbpmConfiguration;
import org.jbpm.graph.def.ProcessDefinition;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import java.io.IOException;
import java.io.BufferedOutputStream;
import java.util.Map;
/**
 * Created by IntelliJ IDEA.
 * User: hehe
 * Date: 2008-7-23
 * Time: 15:49:54
 * To change this template use File | Settings | File Templates.
 */
public class GetProcessDefinitionImage extends HttpServlet
{
    protected void doGet(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException
    {
        String processId = httpServletRequest.getParameter("processId");
        System.out.println("-----------servlet-----pdid:"+processId);
        JbpmContext jbpmContext = JbpmConfiguration.getInstance().createJbpmContext();
        ProcessDefinition pd = jbpmContext.getGraphSession().loadProcessDefinition(Long.parseLong(processId));

        byte[] imageBytes = pd.getFileDefinition().getBytes("processimage.jpg");

        if (imageBytes != null)
        {
            httpServletResponse.setContentType("image/jpeg");

            BufferedOutputStream baos = new BufferedOutputStream(httpServletResponse.getOutputStream());
            baos.write(imageBytes);
            baos.close();
        }
        else
        {
            httpServletResponse.setContentType("text/html");
            httpServletResponse.getOutputStream().write(("get image error,the processId:"+processId).getBytes());
        }
    }
}