【Linux】Linux系统环境下openjdk11导出excel报错问题——以Ubuntu为例离线安装字体

问题的由来

通常，我们开发和部署Java Web项目的时候，使用 Oracle jdk1.8作为开发和生产的运行环境，这这次接了各项目，要求使用指定版本的 openjdk11(11.0.15版本) 作为开发和生产部署的运行环境。
实际开发测试中发现，导出excel文件的功能在开发环境(Windows系统)下能正常到导出文件并打开，但是在测试环境(Ubuntu18.04)下导出文件报错，抛出InvocationTargetException异常。

异常信息

具体异常信息如下：

org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.InternalError: java.lang.reflect.InvocationTargetException
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1082)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
        at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:681)
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
        at com.wangzd.common.requestwrapper.RequestParamsFilter.doFilter(RequestParamsFilter.java:85)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
        at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
        at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
        at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
        at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:154)
        at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
        at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
        at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
        at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:154)
        at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
        at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:458)
        at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:373)
        at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
        at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
        at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:387)
        at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:370)
        at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:154)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:337)
        at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:122)
        at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:116)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
        at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:126)
        at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:81)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
        at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:109)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
        at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:149)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
        at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
        at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:103)
        at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:89)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
        at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
        at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
        at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110)
        at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
        at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
        at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:221)
        at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:186)
        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:354)
        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
        at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
        at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:359)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:889)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1735)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
        at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.lang.InternalError: java.lang.reflect.InvocationTargetException
        at java.desktop/sun.font.FontManagerFactory$1.run(FontManagerFactory.java:86)
        at java.base/java.security.AccessController.doPrivileged(Native Method)
        at java.desktop/sun.font.FontManagerFactory.getInstance(FontManagerFactory.java:74)
        at java.desktop/java.awt.Font.getFont2D(Font.java:497)
        at java.desktop/java.awt.Font.canDisplayUpTo(Font.java:2250)
        at java.desktop/java.awt.font.TextLayout.singleFont(TextLayout.java:469)
        at java.desktop/java.awt.font.TextLayout.<init>(TextLayout.java:530)
        at org.apache.poi.ss.util.SheetUtil.getDefaultCharWidth(SheetUtil.java:273)
        at org.apache.poi.xssf.streaming.AutoSizeColumnTracker.<init>(AutoSizeColumnTracker.java:117)
        at org.apache.poi.xssf.streaming.SXSSFSheet.<init>(SXSSFSheet.java:82)
        at org.apache.poi.xssf.streaming.SXSSFWorkbook.createAndRegisterSXSSFSheet(SXSSFWorkbook.java:684)
        at org.apache.poi.xssf.streaming.SXSSFWorkbook.createSheet(SXSSFWorkbook.java:676)
        at org.apache.poi.xssf.streaming.SXSSFWorkbook.createSheet(SXSSFWorkbook.java:88)
        at com.wangzd.common.utils.poi.ExcelUtil.createWorkbook(ExcelUtil.java:1130)
        at com.wangzd.common.utils.poi.ExcelUtil.init(ExcelUtil.java:171)
        at com.wangzd.common.utils.poi.ExcelUtil.exportExcel(ExcelUtil.java:379)
        at com.wangzd.common.utils.poi.ExcelUtil.exportExcel(ExcelUtil.java:367)
        at com.wangzd.services.controller.CameraConfigController.exportData2(CameraConfigController.java:227)
        at com.wangzd.services.controller.CameraConfigController$$FastClassBySpringCGLIB$$322ad76d.invoke(<generated>)
        at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:793)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763)
        at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:89)
        at com.wangzd.aspect.AutoLogAspect.around(AutoLogAspect.java:48)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:634)
        at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:624)
        at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:72)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763)
        at org.apache.shiro.spring.security.interceptor.AopAllianceAnnotationsAuthorizingMethodInterceptor$1.proceed(AopAllianceAnnotationsAuthorizingMethodInterceptor.java:82)
        at org.apache.shiro.authz.aop.AuthorizingMethodInterceptor.invoke(AuthorizingMethodInterceptor.java:39)
        at org.apache.shiro.spring.security.interceptor.AopAllianceAnnotationsAuthorizingMethodInterceptor.invoke(AopAllianceAnnotationsAuthorizingMethodInterceptor.java:115)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763)
        at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763)
        at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:708)
        at com.wangzd.services.controller.CameraConfigController$$EnhancerBySpringCGLIB$$6c238816.exportData2(<generated>)
        at com.wangzd.services.controller.CameraConfigController$$FastClassBySpringCGLIB$$322ad76d.invoke(<generated>)
        at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:793)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763)
        at org.apache.shiro.spring.security.interceptor.AopAllianceAnnotationsAuthorizingMethodInterceptor$1.proceed(AopAllianceAnnotationsAuthorizingMethodInterceptor.java:82)
        at org.apache.shiro.authz.aop.AuthorizingMethodInterceptor.invoke(AuthorizingMethodInterceptor.java:39)
        at org.apache.shiro.spring.security.interceptor.AopAllianceAnnotationsAuthorizingMethodInterceptor.invoke(AopAllianceAnnotationsAuthorizingMethodInterceptor.java:115)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763)
        at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:708)
        at com.wangzd.services.controller.CameraConfigController$$EnhancerBySpringCGLIB$$9281d5e0.exportData2(<generated>)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150)
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067)
        ... 92 common frames omitted
Caused by: java.lang.reflect.InvocationTargetException: null
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
        at java.desktop/sun.font.FontManagerFactory$1.run(FontManagerFactory.java:84)
        ... 158 common frames omitted
Caused by: java.lang.NullPointerException: null
        at java.desktop/sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1262)
        at java.desktop/sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:225)
        at java.desktop/sun.awt.FontConfiguration.init(FontConfiguration.java:107)
        at java.desktop/sun.awt.X11FontManager.createFontConfiguration(X11FontManager.java:719)
        at java.desktop/sun.font.SunFontManager$2.run(SunFontManager.java:379)
        at java.base/java.security.AccessController.doPrivileged(Native Method)
        at java.desktop/sun.font.SunFontManager.<init>(SunFontManager.java:324)
        at java.desktop/sun.awt.FcFontManager.<init>(FcFontManager.java:35)
        at java.desktop/sun.awt.X11FontManager.<init>(X11FontManager.java:56)
        ... 163 common frames omitted

三方库类

下载excel所依赖的第三方库类为：

<dependency>
    <groupId>org.apache.poigroupId>
    <artifactId>poi-ooxmlartifactId>
    <version>5.2.0version>
dependency>

问题原因

经过排查后发现，Ubuntu18.04 系统默认是不携带字体库的，而服务端程序在调用 poi库类生产excel文件填充的数据的过程中，会涉及到修改单元格CellStyle的样式，例如标题字体高度、字体是否加粗等，这些配置是需要调用系统的字体相关库类的，Windows系统一般自带字体库，而Linux系统则一般原生系统默认不带字体库，这里就是信息测试服务器使用的Ubuntu系统没有安装字体库导致的。

解决问题

给Linux系统安装fontconfig。

在线方式（本人未验证）

ubuntu:

sudo apt-get install fontconfig

CentOS:

yum install -y fontconfig

离线方式(本人验证)

以 Ubuntu18.04 系统为例，安装包下载位置。需要的安装包如下：

• ttf-bitstream-vera_1.10-8_all.deb（或者 fonts-dejavu-core | fonts-liberation | fonts-freefont）
• fontconfig-config_2.12.6-0ubuntu2_all.deb
• libfontconfig1_2.12.6-0ubuntu2_amd64.deb
• fontconfig_2.12.6-0ubuntu2_amd64.deb

按照下面的顺序依次执行以下安装命令，不报错即安装成功：

sudo dpkg -i ttf-bitstream-vera_1.10-8_all.deb 

sudo dpkg -i fontconfig-config_2.12.6-0ubuntu2_all.deb 

sudo dpkg -i libfontconfig1_2.12.6-0ubuntu2_amd64.deb 

sudo dpkg -i fontconfig_2.12.6-0ubuntu2_amd64.deb

安装过程中的日志如下：

ubuntu@i-xn2wv:~$ sudo dpkg -i ttf-bitstream-vera_1.10-8_all.deb 
Selecting previously unselected package ttf-bitstream-vera.
(Reading database ... 103087 files and directories currently installed.)
Preparing to unpack ttf-bitstream-vera_1.10-8_all.deb ...
Unpacking ttf-bitstream-vera (1.10-8) ...
Setting up ttf-bitstream-vera (1.10-8) ...
ubuntu@i-xn2wv:~$
ubuntu@i-xn2wv:~$ sudo dpkg -i fontconfig-config_2.12.6-0ubuntu2_all.deb
(Reading database ... 103105 files and directories currently installed.)
Preparing to unpack fontconfig-config_2.12.6-0ubuntu2_all.deb ...
Unpacking fontconfig-config (2.12.6-0ubuntu2) over (2.12.6-0ubuntu2) ...
Setting up fontconfig-config (2.12.6-0ubuntu2) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
ubuntu@i-xn2wv:~$ 
ubuntu@i-xn2wv:~$ sudo dpkg -i libfontconfig1_2.12.6-0ubuntu2_amd64.deb
(Reading database ... 103105 files and directories currently installed.)
Preparing to unpack libfontconfig1_2.12.6-0ubuntu2_amd64.deb ...
Unpacking libfontconfig1:amd64 (2.12.6-0ubuntu2) over (2.12.6-0ubuntu2) ...
Setting up libfontconfig1:amd64 (2.12.6-0ubuntu2) ...
Processing triggers for libc-bin (2.27-3ubuntu1.5) ...
ubuntu@i-xn2wv:~$ 
ubuntu@i-xn2wv:~$ sudo dpkg -i fontconfig_2.12.6-0ubuntu2_amd64.deb
(Reading database ... 103105 files and directories currently installed.)
Preparing to unpack fontconfig_2.12.6-0ubuntu2_amd64.deb ...
Unpacking fontconfig (2.12.6-0ubuntu2) over (2.12.6-0ubuntu2) ...
Setting up fontconfig (2.12.6-0ubuntu2) ...
Regenerating fonts cache... done.
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
ubuntu@i-xn2wv:~$

检查Linux是否安装了字体库

使用 fc-list命令检查。

未安装字体库返回的结果为：

ubuntu@i-xn2wv:~$ fc-list

Command 'fc-list' not found, but can be installed with:

apt install fontconfig
Please ask your administrator.

已安装字体库的返回结果为：

ubuntu@i-xn2wv:~$ fc-list
/usr/share/fonts/truetype/ttf-bitstream-vera/VeraMoBI.ttf: Bitstream Vera Sans Mono:style=Bold Oblique
/usr/share/fonts/truetype/ttf-bitstream-vera/VeraBI.ttf: Bitstream Vera Sans:style=Bold Oblique
/usr/share/fonts/truetype/ttf-bitstream-vera/VeraBd.ttf: Bitstream Vera Sans:style=Bold
/usr/share/fonts/truetype/ttf-bitstream-vera/VeraSe.ttf: Bitstream Vera Serif:style=Roman
/usr/share/fonts/truetype/ttf-bitstream-vera/VeraMoBd.ttf: Bitstream Vera Sans Mono:style=Bold
/usr/share/fonts/truetype/ttf-bitstream-vera/VeraSeBd.ttf: Bitstream Vera Serif:style=Bold
/usr/share/fonts/truetype/ttf-bitstream-vera/Vera.ttf: Bitstream Vera Sans:style=Roman
/usr/share/fonts/truetype/ttf-bitstream-vera/VeraMono.ttf: Bitstream Vera Sans Mono:style=Roman
/usr/share/fonts/truetype/ttf-bitstream-vera/VeraIt.ttf: Bitstream Vera Sans:style=Oblique
/usr/share/fonts/truetype/ttf-bitstream-vera/VeraMoIt.ttf: Bitstream Vera Sans Mono:style=Oblique
ubuntu@i-xn2wv:~$

安装好 fontconfig 之后，重启Java Web服务，则能正常导出excel文件。

注意

离线安装的过程中，如果没有按照顺序进行安装，会报错，报错中有响应的提示，提醒优先安装被依赖的库类。
例如，如果直接安装 fontconfig_2.12.6-0ubuntu2_amd64.deb 包的话，会提示依赖包未安装Package libfontconfig1 is not installed. Package fontconfig-config is not installed.。

具体不按照依赖顺序安装的错误提示日志如下：

ubuntu@i-xn2wv:~$ sudo dpkg -i fontconfig_2.12.6-0ubuntu2_amd64.deb 
Selecting previously unselected package fontconfig.
(Reading database ... 102983 files and directories currently installed.)
Preparing to unpack fontconfig_2.12.6-0ubuntu2_amd64.deb ...
Unpacking fontconfig (2.12.6-0ubuntu2) ...
dpkg: dependency problems prevent configuration of fontconfig:
 fontconfig depends on libfontconfig1 (>= 2.12); however:
  Package libfontconfig1 is not installed.
 fontconfig depends on fontconfig-config; however:
  Package fontconfig-config is not installed.

dpkg: error processing package fontconfig (--install):
 dependency problems - leaving unconfigured
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Errors were encountered while processing:
 fontconfig
ubuntu@i-xn2wv:~$ sudo dpkg -i libfontconfig1_2.12.6-0ubuntu2_amd64.deb 
Selecting previously unselected package libfontconfig1:amd64.
(Reading database ... 103013 files and directories currently installed.)
Preparing to unpack libfontconfig1_2.12.6-0ubuntu2_amd64.deb ...
Unpacking libfontconfig1:amd64 (2.12.6-0ubuntu2) ...
dpkg: dependency problems prevent configuration of libfontconfig1:amd64:
 libfontconfig1:amd64 depends on fontconfig-config (>= 2.12.6-0ubuntu2); however:
  Package fontconfig-config is not installed.

dpkg: error processing package libfontconfig1:amd64 (--install):
 dependency problems - leaving unconfigured
Processing triggers for libc-bin (2.27-3ubuntu1.5) ...
Errors were encountered while processing:
 libfontconfig1:amd64
ubuntu@i-xn2wv:~$ sudo dpkg -i fontconfig-config_2.12.6-0ubuntu2_all.deb 
Selecting previously unselected package fontconfig-config.
(Reading database ... 103020 files and directories currently installed.)
Preparing to unpack fontconfig-config_2.12.6-0ubuntu2_all.deb ...
Unpacking fontconfig-config (2.12.6-0ubuntu2) ...
dpkg: dependency problems prevent configuration of fontconfig-config:
 fontconfig-config depends on fonts-dejavu-core | ttf-bitstream-vera | fonts-liberation | fonts-freefont; however:
  Package fonts-dejavu-core is not installed.
  Package ttf-bitstream-vera is not installed.
  Package fonts-liberation is not installed.
  Package fonts-freefont is not installed.

dpkg: error processing package fontconfig-config (--install):
 dependency problems - leaving unconfigured
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Errors were encountered while processing:
 fontconfig-config
ubuntu@i-xn2wv:~$