flowable生成流程图

原文链接： https://my.oschina.net/u/178150/blog/1973438

/**
 * 生成流程图
 *
 * @param processId 任务ID
 */
@RequestMapping("/diagram/{processId}")
public void genProcessDiagram(HttpServletResponse httpServletResponse,
                              @PathVariable("processId") String processId) throws Exception {
    ProcessInstance pi = runtimeService.createProcessInstanceQuery().processInstanceId(processId).singleResult();

    //流程走完的不显示图
    if (pi == null) {
        return;
    }
    Task task = taskService.createTaskQuery().processInstanceId(pi.getId()).singleResult();
    //使用流程实例ID，查询正在执行的执行对象表，返回流程实例对象
    String InstanceId = task.getProcessInstanceId();
    List executions = runtimeService
            .createExecutionQuery()
            .processInstanceId(InstanceId)
            .list();

    //得到正在执行的Activity的Id
    List activityIds = new ArrayList<>();
    List flows = new ArrayList<>();
    for (Execution exe : executions) {
        List ids = runtimeService.getActiveActivityIds(exe.getId());
        activityIds.addAll(ids);
    }

    //获取流程图
    BpmnModel bpmnModel = repositoryService.getBpmnModel(pi.getProcessDefinitionId());
    ProcessEngineConfiguration engconf = processEngine.getProcessEngineConfiguration();
    ProcessDiagramGenerator diagramGenerator = engconf.getProcessDiagramGenerator();
    InputStream in = diagramGenerator.generateDiagram(bpmnModel, "png",
            activityIds, flows, "宋体","宋体","宋体",null,1.0);
    OutputStream out = null;
    byte[] buf = new byte[1024];
    int legth = 0;
    try {
        out = httpServletResponse.getOutputStream();
        while ((legth = in.read(buf)) != -1) {
            out.write(buf, 0, legth);
        }
    } finally {
        if (in != null) {
            in.close();
        }
        if (out != null) {
            out.close();
        }
    }
}

转载于:https://my.oschina.net/u/178150/blog/1973438