JBPM显示流程图

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1.编辑流程定义文件，并将*.jpdl.xml及生成的png图片打成zip包，使用zip包发布流程。

2.获取流程图代码如下：

JbpmProcess.java

public BufferedImage getProcessStateImage(String processInstanceId) throws IOException{// 获取流程实例ProcessInstance processInstance = executionService.findProcessInstanceById(processInstanceId);// 获取流程定义 idString processDefinitionId = processInstance.getProcessDefinitionId();// 获取流程定义ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery().processDefinitionId(processDefinitionId).uniqueResult();// 获取原始流程图片输入流InputStream in = repositoryService.getResourceAsStream(processDefinition.getDeploymentId(), processDefinition.getName() + ".png");// 将原始图片载入BufferedImage中 以便处理Image i = ImageIO.read(in);BufferedImage img = new BufferedImage(i.getWidth(null), i.getHeight(null), BufferedImage.TYPE_INT_RGB);Graphics2D g = img.createGraphics();g.drawImage(i, null, null);g.setColor(Color.RED);// 获取当前活动节点, 并在流程图上画红色的框Set<String> activityNames = processInstance.findActiveActivityNames();Iterator<String> iter = activityNames.iterator();while(iter.hasNext()){String name = iter.next();ActivityCoordinates ac = repositoryService.getActivityCoordinates(processDefinitionId, name);if(ac != null){g.drawRect(ac.getX(), ac.getY(), ac.getWidth(), ac.getHeight());}}return img;}

该方法返回标出活动节点之后的流程图图片。

3.调用方法

ProcessAction.java

public void getProcessPic() throws IOException{BufferedImage img = jbpmProcess.getProcessStateImage(processInstanceId);// 禁止图像缓存。response.setHeader("Pragma", "no-cache");response.setHeader("Cache-Control", "no-cache");response.setDateHeader("Expires", 0);response.setContentType("image/png");ImageIO.write(img, "png", response.getOutputStream());}

test.html

<img src="process/process_getProcessPic.action?processInstanceId=xxxx"/>

4.效果如下

单活动节点

多活动节点

更多代码：https://github.com/pengkan90

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