rendering Unicode glyphs

I want to render Unicode glyphs to jpg format. Should I change the font for each Unicode block in my java Code? I tried not to do that, but it di开发者_如何学Pythond not work. However, changing the font for each block takes a lot of time. Do you know any better way?

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Can I ask which font covers the full Unicode range?

None. Citing Wikipedia:

Currently (August, 2008), no single "Unicode font" includes all the characters defined in the present revision of the ISO 10646 (Unicode) standard. In fact, it would be impossible to create such a font in any common font format, as Unicode includes over 100,000 characters, while no widely-used font format supports more than 65,535 glyphs. So while one could make a set of related fonts to cover all of Unicode, a single Unicode font is not possible at this time.