Here are a few titles for your article, following the question-and-answer format, that capture the essence of the content: * How to Display Chinese Characters in PDF Documents Using Apache FOP? * Why

Displaying Chinese Characters in PDF Documents Using Apache FOP

Background

Apache FOP, a popular library for generating PDF documents, has faced issues with displaying Chinese characters as "####." This occurs because default fonts like Helvetica do not support these characters.

Three Essential Steps for Correct Display

To ensure proper rendering of Chinese characters, three key steps are required:

1. Set Font-Family in the FO File:
   Specifying the desired font-family explicitly, such as "SimSun," allows FOP to use a font that supports the required characters. This step is crucial as the default font may not be suitable.
2. Configure Font Mapping in FOP's Configuration File:
   Apache FOP requires explicit mapping between font-families and font files. Edit the fop.xconf configuration file to add font mapping information. This includes specifying the font file location and the font-family it corresponds to.
3. Tell FOP to Use the Configuration File:
   During FOP execution, either via command line or Java code, provide the path to the fop.xconf file using the -c option or the setUserConfig() method. This step ensures that FOP uses the updated configuration.

Troubleshooting

If errors occur after implementing these steps, check the following:

• Ensure there are no typos in the font URL in the configuration file.
• Verify that the user has sufficient privileges to access the specified font file.

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