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1. If it is "user" passed from the page, check if the encoding on your page is UTF-8;
2. If it is setAttribute("user", "Zhang San") in the background of the program, then you need to check Is the encoding of the java file UTF-8?
3. If it is the same as 2, but "Zhang San" comes from the database, then look at the string "Zhang San" which is garbled when settingAttribute;

Summary:
Page, background java file, database unified encoding

Check to see if the user is garbled when passed in,,,