Jfreechart cannot display Chinese characters on Linux

The method is as follows:
A Chinese TrueType font library, simsun. TTF, C:/Windows/Fonts
1. Check whether simsun. TTF exists in the % javahome %/JRE/lib/fonts directory.
2. Run the "ttmkfdir-O fonts. dir" command in the % javahome %/JRE/lib/fonts directory to regenerate the fonts. dir file.
3. confirm that the/usr/share/fonts/zh_cn/TrueType directory exists. If not, mkdir is created.
4. Confirm that simsun. TTF exists in the/usr/share/fonts/zh_cn/TrueType directory.
5. In the % javahome %/JRE/lib directory, run CP fontconfig. redhat.3.properties. SRC fontconfig. Properties
6. Restart tomcat or resin