javax.servlet.jsp.JspWriter out;
这句话是什么意思，请说说！！！
还有

public BookDetail getDetail(long bookid,javax.servlet.jsp.JspWriter out){
BookDetail bookdtl=new BookDetail();
try{
      ResultSet rs=stmt.executeQuery("select *from book_detail"+"where bookid='"+bookid+"'");
    while(rs.next()){
        bookdtl.id=rs.getLong("id");
        bookdtl.author=rs.getString("author");
        bookdtl.introduce=rs.getString("introduce");
        bookdtl.publisher=rs.getString("publisher");
        bookdtl.pagenum=rs.getInt("pagenum");
        bookdtl.edition=rs.getString("edition");
        }
        rs.close();
        }catch(Exception e){
        System.err.println(e);
        }
        return bookdtl;
        }

我在进行编译时，老出现错误：packae javax.servlet.jsp does not exist
我想问一下：在写javax.servlet.jsp.JspWriter out;这句话时是不是要加入其他的包，如果是的，应该加哪些包呢？