1. The source of the problem is to directly view the garbled code in the class of springside (automatically decompiled by eclipse) in eclipse:
Preferences-General-Workspace-Text file encoding is set to uft-8
Finally restarting eclipse is usually ok.
2. If the source code of the associated jar is garbled, try the following methods:
Set the default encoding of Java Class File and Text in General>ContentTypes in Eclipse's Preferences to UTF-8 (or any other encoding format you need to set)
and re-associate it once! If it still doesn't work, try to re-associate the source jar package in another place.