SSM 两表联查 controller 用 Model 传值到 jsp

 

 对应的是 实体类字段名，不分大小写   --多对一，，，

一对多：

1.通过 book 查 一方 author

[Author(aid=1, aname=李伟志, bid=1, books=[Books(bookID=1, bookName=Java, bookCounts=0, detail=从入门到放弃, author=null)])]

2.通过author 查多方book ，结果不一样 
[Books(bookID=1, bookName=Java, bookCounts=1, detail=从入门到放弃, author=Author(aid=1, aname=李伟志, bid=1, books=[Books(bookID=1, bookName=Java, bookCounts=0, detail=从入门到放弃, author=null)]))]