I did some research on the subject and it's very difficult to find libraries that decode Datamatrix.
Maybe you'll find this library interesting : libdmtx, it is written in C but you have a Java wrapper (informations on the libdmtx wiki).
I know that is not J2ME like you want but maybe you can find a way to create a J2ME wrapper with that or the Java wrapper could work with a J2ME project.
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我对这个主题做了一些研究，很难找到解码 Datamatrix 的库。
也许您会发现这个库很有趣：libdmtx，它是用 C 编写的，但您有一个 Java 包装器（ libdmtx wiki 上的信息）。
我知道这不是您想要的 J2ME，但也许您可以找到一种方法来创建 J2ME 包装器，或者 Java 包装器可以与 J2ME 项目一起使用。
希望这有帮助！
I did some research on the subject and it's very difficult to find libraries that decode Datamatrix.
Maybe you'll find this library interesting : libdmtx, it is written in C but you have a Java wrapper (informations on the libdmtx wiki).
I know that is not J2ME like you want but maybe you can find a way to create a J2ME wrapper with that or the Java wrapper could work with a J2ME project.
Hope this helps !