Seems like there aren't many open source java libraries dedicated to image optimization. But there are quite many libraries offering image optimization as part of their features.
For example:
im4java is a pure java library offers interfaces to ImageMagick, which can be used to optimize images.
ImageJ, it can be used as a library according to this answer
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似乎没有很多专门用于图像优化的开源 java 库。但有很多库提供图像优化作为其功能的一部分。
例如：
im4java 是一个纯java库，提供ImageMagick接口，可用于优化图像。
ImageJ，可以按照这个答案
Seems like there aren't many open source java libraries dedicated to image optimization. But there are quite many libraries offering image optimization as part of their features.
For example:
im4java is a pure java library offers interfaces to ImageMagick, which can be used to optimize images.
ImageJ, it can be used as a library according to this answer