excel导出在docker环境中总是失败 ，最直接的原因还是因为没有安装中文字体，解决方法如下：

DOCKER环境中没有安装中文字体，需要安装

java.lang.NullPointerException: null2020/5/29 上午8:40:11 at sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1264)2020/5/29 上午8:40:11 at sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:219)2020/5/29 上午8:40:11 at sun.awt.FontConfiguration.init(FontConfiguration.java:107)2020/5/29 上午8:40:11 at sun.awt.X11FontManager.createFontConfiguration(X11FontManager.java:776)2020/5/29 上午8:40:11 at sun.font.SunFontManager$2.run(SunFontManager.java:431)2020/5/29 上午8:40:11 at java.security.AccessController.doPrivileged(Native Method)2020/5/29 上午8:40:11 at sun.font.SunFontManager.<init>(SunFontManager.java:376)2020/5/29 上午8:40:11 at sun.awt.X11FontManager.<init>(X11FontManager.java:57)2020/5/29 上午8:40:11 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)2020/5/29 上午8:40:11 at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)2020/5/29 上午8:40:11 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)2020/5/29 上午8:40:11 at java.lang.reflect.Constructor.newInstance(Constructor.java:422)2020/5/29 上午8:40:11 at java.lang.Class.newInstance(Class.java:442)2020/5/29 上午8:40:11 at sun.font.FontManagerFactory$1.run(FontManagerFactory.java:83)2020/5/29 上午8:40:11 at java.security.AccessController.doPrivileged(Native Method)2020/5/29 上午8:40:11 at sun.font.FontManagerFactory.getInstance(FontManagerFactory.java:74)2020/5/29 上午8:40:11 at java.awt.Font.getFont2D(Font.java:491)2020/5/29 上午8:40:11 at java.awt.Font.canDisplayUpTo(Font.java:2060)2020/5/29 上午8:40:11 at java.awt.font.TextLayout.singleFont(TextLayout.java:470)2020/5/29 上午8:40:11 at java.awt.font.TextLayout.<init>(TextLayout.java:531)2020/5/29 上午8:40:11 at org.apache.poi.ss.util.SheetUtil.getDefaultCharWidth(SheetUtil.java:254)2020/5/29 上午8:40:11 at org.apache.poi.xssf.streaming.AutoSizeColumnTracker.<init>(AutoSizeColumnTracker.java:117)2020/5/29 上午8:40:11 at org.apache.poi.xssf.streaming.SXSSFSheet.<init>(SXSSFSheet.java:77)2020/5/29 上午8:40:11 at org.apache.poi.xssf.streaming.SXSSFWorkbook.createAndRegisterSXSSFSheet(SXSSFWorkbook.java:636)2020/5/29 上午8:40:11 at org.apache.poi.xssf.streaming.SXSSFWorkbook.createSheet(SXSSFWorkbook.java:657)2020/5/29 上午8:40:11 at org.apache.poi.xssf.streaming.SXSSFWorkbook.createSheet(SXSSFWorkbook.java:71)2020/5/29 上午8:40:11 at com.chanjet.dsf.util.ExcelUtil.exportExcel(ExcelUtil.java:783)2020/5/29 上午8:40:11 at com.chanjet.dsf.base.BaseService.uploadExcel(BaseService.java:89)2020/5/29 上午8:40:11 at com.chanjet.dsf.goods.service.impl.GoodsServiceImpl.importExcel(GoodsServiceImpl.java:340)2020/5/29 上午8:40:11 at com.chanjet.dsf.goods.service.impl.GoodsServiceImpl$$FastClassBySpringCGLIB$$d268cc51.invoke(<generated>)2020/5/29 上午8:40:11 at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)2020/5/29 上午8:40:11 at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:685)2020/5/29 上午8:40:11 at com.chanjet.dsf.goods.service.impl.GoodsServiceImpl$$EnhancerBySpringCGLIB$$a0a512ec.importExcel(<generated>)2020/5/29 上午8:40:11 at com.chanjet.dsf.goods.controller.GoodsController.importExcel(GoodsController.java:105)2020/5/29 上午8:40:11 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)2020/5/29 上午8:40:11 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)2020/5/29 上午8:40:11 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)2020/5/29 上午8:40:11 at java.lang.reflect.Method.invoke(Method.java:497)2020/5/29 上午8:40:11 at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)2020/5/29 上午8:40:11 at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)2020/5/29 上午8:40:11 at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)2020/5/29 上午8:40:11 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879)2020/5/29 上午8:40:11 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)2020/5/29 上午8:40:11 at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)2020/5/29 上午8:40:11 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)2020/5/29 上午8:40:11 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)2020/5/29 上午8:40:11 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)2020/5/29 上午8:40:11 at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)2020/5/29 上午8:40:11 at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)2020/5/29 上午8:40:11 at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)2020/5/29 上午8:40:11 at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)2020/5/29 上午8:40:11 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)2020/5/29 上午8:40:11 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)2020/5/29 上午8:40:11 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)2020/5/29 上午8:40:11 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)2020/5/29 上午8:40:11 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)2020/5/29 上午8:40:11 at com.chanjet.dsf.filter.RefreshContextFilter.doFilter(RefreshContextFilter.java:29)2020/5/29 上午8:40:11 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)2020/5/29 上午8:40:11 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)2020/5/29 上午8:40:11 at com.chanjet.dsf.filter.WebLogMDCFilter.doFilter(WebLogMDCFilter.java:27)2020/5/29 上午8:40:11 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)2020/5/29 上午8:40:11 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)2020/5/29 上午8:40:11 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)2020/5/29 上午8:40:11 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)2020/5/29 上午8:40:11 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)2020/5/29 上午8:40:11 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)2020/5/29 上午8:40:11 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)2020/5/29 上午8:40:11 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)2020/5/29 上午8:40:11 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)2020/5/29 上午8:40:11 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)2020/5/29 上午8:40:11 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)2020/5/29 上午8:40:11 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)2020/5/29 上午8:40:11 at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:747)2020/5/29 上午8:40:11 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)2020/5/29 上午8:40:11 at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)2020/5/29 上午8:40:11 at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)2020/5/29 上午8:40:11 at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)2020/5/29 上午8:40:11 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1639)2020/5/29 上午8:40:11 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)2020/5/29 上午8:40:11 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)2020/5/29 上午8:40:11 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)2020/5/29 上午8:40:11 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)2020/5/29 上午8:40:11 at java.lang.Thread.run(Thread.java:745)

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