解决方案：
在包扫描的包下面创建一个生成的流程图配置类

package cn.stylefeng.guns.modular.flowable.config;import org.flowable.spring.SpringProcessEngineConfiguration;
import org.flowable.spring.boot.EngineConfigurationConfigurer;
import org.springframework.context.annotation.Configuration;/*** @Author: gblfy* @Description: 为放置生成的流程图中中文乱码* @Date: Create in 2019/11/03 10:26*/
@Configuration
public class FlowableConfig implements EngineConfigurationConfigurer<SpringProcessEngineConfiguration> {@Overridepublic void configure(SpringProcessEngineConfiguration springProcessEngineConfiguration) {springProcessEngineConfiguration.setActivityFontName("宋体");springProcessEngineConfiguration.setLabelFontName("宋体");springProcessEngineConfiguration.setAnnotationFontName("宋体");}
}

如果是linux，安装相应的字体即可
Linux 中文无法显示或显示方块
https://blog.csdn.net/weixin_40816738/article/details/101727729