flowable 6.4.1 流程图展示（动态流程图）乱码问题

忘是亡心i 2024-02-19 20:02 62阅读 0赞

运用flowable处理工作流时，难免会用到一个功能，就是查看流程图当前进展或者说走向，但是流程图输出到页面一直是乱码，有的大神说是字体问题，设置成宋体就好了：

import org.flowable.spring.SpringProcessEngineConfiguration;
    import org.flowable.spring.boot.EngineConfigurationConfigurer;
    import org.springframework.context.annotation.Configuration;
    
    @Configuration
    public class FlowableConfig implements EngineConfigurationConfigurer<SpringProcessEngineConfiguration> {
    
    
        @Override
        public void configure(SpringProcessEngineConfiguration engineConfiguration) {
            engineConfiguration.setActivityFontName("宋体");
            engineConfiguration.setLabelFontName("宋体");
            engineConfiguration.setAnnotationFontName("宋体");
        }
    }

但是我的还是不行，尝试了很多方法，最后靠一个工具类操作输入输出流解决了

javax.imageio.ImageIO;

贴上代码，有遇到类似问题的可以参考：

/**
         * 查看当前流程图已到达节点
         * @param httpServletResponse
         * @param processId 流程实例id
         * @throws IOException
         */
        @ApiOperation("查看流程图")
        @GetMapping("/genProcessDiagrams")
        public void genProcessDiagrams(HttpServletResponse httpServletResponse, String processId) throws IOException{
            ProcessInstance pi = runtimeService.createProcessInstanceQuery().processInstanceId(processId).singleResult();
            //流程走完的不显示图
            if (pi == null) {
                return;
            }
    
            //获得活动的节点
            List<HistoricActivityInstance> historyProcess =  historyService.createHistoricActivityInstanceQuery().processInstanceId(processId).orderByHistoricActivityInstanceStartTime().asc().list();
    
            List<String> activityIds = new ArrayList<>();
            List<String> flows = new ArrayList<>();
            //获取流程图
            BpmnModel bpmnModel = repositoryService.getBpmnModel(pi.getProcessDefinitionId());
            for (HistoricActivityInstance hi : historyProcess) {
                String activityType = hi.getActivityType();
                if (activityType.equals("sequenceFlow") || activityType.equals("exclusiveGateway")) {
                    flows.add(hi.getActivityId());
                } else if (activityType.equals("userTask") || activityType.equals("startEvent")) {
                    activityIds.add(hi.getActivityId());
                }
            }
            List<Task> tasks = taskService.createTaskQuery().processInstanceId(processId).list();
            for (Task task : tasks) {
                activityIds.add(task.getTaskDefinitionKey());
            }
            ProcessEngineConfiguration engConf = processEngineConfiguration;
            //定义流程画布生成器
            ProcessDiagramGenerator processDiagramGenerator = engConf.getProcessDiagramGenerator();
            InputStream in = processDiagramGenerator.generateDiagram(bpmnModel, "png", activityIds, flows, engConf.getActivityFontName()
                    , engConf.getLabelFontName(), engConf.getAnnotationFontName(), engConf.getClassLoader(), 1.0, true);
    
            // 设置响应的类型格式为图片格式
            httpServletResponse.setContentType("image/png");
            //禁止图像缓存。
            httpServletResponse.setHeader("Pragma", "no-cache");
            httpServletResponse.setHeader("Cache-Control", "no-cache");
            httpServletResponse.setDateHeader("Expires", 0);
    
            OutputStream out = null;
            byte[] buf = new byte[1024];
            int legth = 0;
            try {
    
                out = httpServletResponse.getOutputStream();
                BufferedImage buffImg = null;
                buffImg = ImageIO.read(in);
                ImageIO.write(buffImg, "png", out);
    
            }catch (IOException e){
                e.printStackTrace();
            } finally {
                if (in != null) {
                    in.close();
                }
                if (out != null) {
                    out.close();
                }
            }
        }