JBPM流程图不显示

空白-键 2010-05-29 10:36:52

我想追踪一个流程实例的过程，显示流程图，可是图片总是不显示
下面是要显示图片的jsp页面的代码



<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="UTF-8"%>

<%@ page import="java.util.*, org.jbpm.api.*, org.jbpm.api.model.*" %>

<%

	String path = request.getContextPath();

%>

<%

 		String processInstanceId = request.getParameter("id");

	    ProcessEngine processEngine = Configuration.getProcessEngine();

		RepositoryService repositoryService = processEngine.getRepositoryService();

    	ExecutionService executionService = processEngine.getExecutionService();

    	ProcessInstance processInstance = executionService.findProcessInstanceById(processInstanceId);

    	Set<String> activeNames = processInstance.findActiveActivityNames();

    	

    	ActivityCoordinates ac = repositoryService.getActivityCoordinates(processInstance.getProcessDefinitionId(), activeNames.iterator().next());

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title>My JSP 'view.jsp' starting page</title>



  </head>

  

  <body>

    

    <img src="<%=path %>/jbpm/jbpm_drawImage?id=<%=processInstanceId %>" style="position:absolute; left: 0px; top: 0px;"/>

    <div style="position:absolute; border:1px solid #cc0000; left:<%=ac.getX() %>px; top: <%=ac.getY() %>px; width: <%=ac.getWidth() %>px; height: <%=ac.getHeight() %>px;"></div>

  </body>

</html>

下面代码是上面img获取图片的struts2代码



public String drawImage() throws IOException {

		String processInstanceId = request.getParameter("id");

	     

	    ProcessEngine processEngine = Configuration.getProcessEngine();

		RepositoryService repositoryService = processEngine.getRepositoryService();

    	ExecutionService executionService = processEngine.getExecutionService();

    	ProcessInstance processInstance = executionService.findProcessInstanceById(processInstanceId);

    	String processDefinitionId = processInstance.getProcessDefinitionId();

    	ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery()

    														   .processDefinitionId(processDefinitionId)

    														   .uniqueResult();

    	InputStream inputStream = repositoryService.getResourceAsStream(processDefinition.getDeploymentId(), processDefinition.getImageResourceName());

    	System.err.println(processDefinition.getImageResourceName()); //输出结果为leave.png,是正确的

    	byte[] b = new byte[1024*4];

    	int len = -1;

    	while((len = inputStream.read(b, 0, 1024*4)) != -1) {

    		System.err.println(len);//输出结果为2518,说明有读取到数据

    		response.getOutputStream().write(b, 0, len);

    	}

		return null;

		

	}

当页面转到上面要显示图片的jsp时，显示的小红叉
我用的是jbpm4.3

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空白-键 2010-05-31

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upup

空白-键 2010-05-30

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后台没报错
代码一样啊，我就是根据视频教程写出的代码，只不过先把代码全部放在struts2里面而已
如果我像视频教程那样，写在jsp里面，我运行时后台会报错：getOutputStream() has already bean called for this response

临远 2010-05-30

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另外，有jbpm4的问题，可以直接来我们的论坛版块：
http://old.family168.com/bbs/index.asp?boardid=6

临远 2010-05-30

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你发布流程图了吗？
后台报社么错啊？

参考我们的视频教程：
http://code.google.com/p/family168/downloads/detail?name=jBPM%204%E8%A7%86%E9%A2%91%E6%95%99%E7%A8%8B09%E6%B5%81%E7%A8%8B%E5%9B%BE%E8%B7%9F%E8%B8%AA.zip&can=2&q=#makechanges

照着视频肯定可以做出来，只要你够细心。

临远 2010-05-30