/**
 * 生成流程圖
 *
 * @param processId 任務(wù)ID
 */
@RequestMapping("/diagram/{processId}")
public void genProcessDiagram(HttpServletResponse response,
                              @PathVariable("processId") String processId) {
    InputStream inputStream = flowTaskService.diagram(processId);
    OutputStream os = null;
    BufferedImage image = null;
    try {
        image = ImageIO.read(inputStream);
        response.setContentType("image/png");
        os = response.getOutputStream();
        if (image != null) {
            ImageIO.write(image, "png", os);
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            if (os != null) {
                os.flush();
                os.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

/**
 * 獲取流程過程圖
 */
public InputStream diagram(String processId) {
    String processDefinitionId;
    // 獲取當前的流程實例
    ProcessInstance processInstance = runtimeService.createProcessInstanceQuery().processInstanceId(processId).singleResult();
    // 如果流程已經(jīng)結(jié)束，則得到結(jié)束節(jié)點
    if (Objects.isNull(processInstance)) {
        HistoricProcessInstance pi = historyService.createHistoricProcessInstanceQuery().processInstanceId(processId).singleResult();

        processDefinitionId = pi.getProcessDefinitionId();
    } else {// 如果流程沒有結(jié)束，則取當前活動節(jié)點
        // 根據(jù)流程實例ID獲得當前處于活動狀態(tài)的ActivityId合集
        ProcessInstance pi = runtimeService.createProcessInstanceQuery().processInstanceId(processId).singleResult();
        processDefinitionId = pi.getProcessDefinitionId();
    }

    // 獲得活動的節(jié)點
    List<HistoricActivityInstance> highLightedFlowList = historyService.createHistoricActivityInstanceQuery()
        .processInstanceId(processId).orderByHistoricActivityInstanceStartTime().asc().list();

    List<String> highLightedFlows = new ArrayList<>();
    List<String> highLightedNodes = new ArrayList<>();
    //高亮線
    for (HistoricActivityInstance tempActivity : highLightedFlowList) {
        if ("sequenceFlow".equals(tempActivity.getActivityType())) {
            //高亮線
            highLightedFlows.add(tempActivity.getActivityId());
        } else {
            //高亮節(jié)點
            highLightedNodes.add(tempActivity.getActivityId());
        }
    }

    //獲取流程圖
    BpmnModel bpmnModel = repositoryService.getBpmnModel(processDefinitionId);
    ProcessEngineConfiguration configuration = processEngine.getProcessEngineConfiguration();
    //獲取自定義圖片生成器
    ProcessDiagramGenerator diagramGenerator = new CustomProcessDiagramGenerator();
    return diagramGenerator.generateDiagram(bpmnModel, "png", highLightedNodes, highLightedFlows, configuration.getActivityFontName(),
        configuration.getLabelFontName(), configuration.getAnnotationFontName(), configuration.getClassLoader(), 1.0, true);
}

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