自动装配

对象

@RequestMapping("/Area")
public String login4(UserInfo info){
    System.out.println(info.getUname()+"\t"+info.getBook().getBookname());

   /* System.out.println(info.getUname()+"\t"+info.getBooks().get(0).getBookname());*/
    return "/WEB-INF/delete.jsp";
}

<form action="${pageContext.request.contextPath}/Area" method="post">
    用户名<input name="uname"/>
    <input name="book.bookname"/>
    
    <input type="submit"/>
</form>
集合

@RequestMapping("/Area")
public String login4(UserInfo info){
    System.out.println(info.getUname()+"\t"+info.getBook().getBookname());

   /* System.out.println(info.getUname()+"\t"+info.getBooks().get(0).getBookname());*/
    return "/WEB-INF/delete.jsp";
}

<form action="${pageContext.request.contextPath}/Area" method="post">
    用户名<input name="uname"/>
   <%-- <input name="book.bookname"/>--%>
    书名1<input name="books[0].bookname"/>
    书名2<input name="books[1].bookname"/>
    <input type="submit"/>
</form>