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       
(Showing Draft Content)

Linux下GCExcel找不到字体问题

问题:Linux下GCExcel找不到字体问题

背景:

GcExcel作为一个服务端控件,对服务端的操作系统资源是有一定的依赖的。虽然无论是Java版还是.Net版,都有能够支持它运行的系统环境。但有一些资源是运行环境无法提供的,比如本文说的字体问题。

我们容易理解的是,GcExcel在导出PDF时需要给PDF注入字体包,但其实它在加载(opne)文档时,就需要读取系统的字体库,以判断字体对样式的影响。而不同的操作系统,默认的字体库路径和字体库的数量都是不同的,所以在这里可能常常会遇到问题。

与字体相关的问题:

1、导出PDF,中文部分乱码。

2、加载(open)文档性能降低。

3、DEBUG级别下的Log日志中会出现大量的异常(例如:java。lang。IllegalArgumentException:NoglyphforU+FF0C(,)infontArialMT)

4、DEBUG级别下Log日志中有FontInfos:字段,会打印出对应的字体库,如果字体库为空,或者字体库中没有包含文档中使用的字体,说明字体包缺失了。

问题原因:

一般这类字体问题出现在当我们用Windows或Mac机开发调试正常,然后,部署到Linux环境中时就出现了字体问题。

原因是由于Windows/Mac原生提供了大量可用的原生字体库文件,GcExcel可以正常读取并使用。但Linux系统由于其特性,一般会有字体包的缺失,所以需要把对应的字体包设置到系统字体目录下,或者指定的字体目录。

注意:字体文件不是GcExcel产品的内容,需要用户根据需求自行寻找对应的字体文件使用。另外,提醒注意字体的版权问题。

解决方案:

1、按照上文 与字体相关问题 中的提示排查原因,确定是字体包缺失导致的;

2、寻找正版字体,注意,网上经常会有一些字体包是非正版或不正规的字体,也会导致字体包缺失的问题;

3、把字体包添加到系统目录下,或给GcExcel指定字体目录,参考该链接


注意:如果是Web应用,打了War包的话,请不要把字体包放到War包中,这样可能会造成目录设置失败的问题。