java - An object is set in the session, but cannot be retrieved in Jsp

Question

Inside session

session.setAttribute("user",user);

Then get

in jsp

${user.reader_name}

I have never been able to get it, but I can get his toString return value directly from ${user}

getset has been written
HELP

Answer 1

What you get from jsp are all strings. How can strings have attributes?
var obj=JSON.parse("${user}")

Answer 2

Requires serialization and deserialization

Answer 3

Sorry. . . I made a strange mistake in one place
The reader_name attribute of the object was not assigned a value at all, so its default value was used

Answer 4

spring and springMVC seem to work