本文实例为大家分享了java网上图书商城Category模块代码，供大家参考，具体内容如下

sql

CREATE TABLE `t_category` ( `cid` char(32) NOT NULL, `cname` varchar(50) DEFAULT NULL, `pid` char(32) DEFAULT NULL, `desc` varchar(100) DEFAULT NULL, `orderBy` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`cid`), UNIQUE KEY `cname` (`cname`), KEY `FK_t_category_t_category` (`pid`), KEY `orderBy` (`orderBy`), CONSTRAINT `FK_t_category_t_category` FOREIGN KEY (`pid`) REFERENCES `t_category` (`cid`) ) ENGINE=InnoDB AUTO_INCREMENT=48 DEFAULT CHARSET=utf8;

Dao

public List<Category> findAll() throws SQLException { /* * 1. 查询出所有一级分类 */ String sql = "select * from t_category where pid is null order by orderBy"; List<Map<String,Object>> mapList = qr.query(sql, new MapListHandler()); List<Category> parents = toCategoryList(mapList); /* * 2. 循环遍历所有的一级分类，为每个一级分类加载它的二级分类 */ for(Category parent : parents) { // 查询出当前父分类的所有子分类 List<Category> children = findByParent(parent.getCid()); // 设置给父分类 parent.setChildren(children); } return parents; }

left.jsp

Q6MenuBar组件显示手风琴式下拉菜单

<script language="javascript"> $(function() { .... <c:forEach items="${parents}" var="parent"> <c:forEach items="${parent.children}" var="child"> bar.add("${parent.cname}", "${child.cname}", "/goods/BookServlet?method=findByCategory&cid=${child.cid}", "body"); </c:forEach> </c:forEach> }); </script>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持查字典教程网。