@RequestMapping("getTree")
public Map<String, Object> getTree(int id) {
Map<String, Object> map = new HashMap<>();
try {
ChinaCitys province = dao.findProvince(id); //查询出一个省
if (province != null) {
List<ChinaCitys> citys = dao.findChildren(province.getId());//查询省下面的所有市
digui(citys); //调用递归算法查询市以下的区县
province.setChildren(citys);
}
map.put("data", province);
} catch (Exception e) {
e.printstacktrace();
}
return map;
}
public void digui(List<ChinaCitys> citys) {
List<ChinaCitys> retList = new ArrayList<>();
for (ChinaCitys c : citys) {
retList = dao.findChildren(c.getId());
if (retList.size() > 0) {
c.setChildren(retList);
digui(retList); //循环调用自己
}
}
}
<select id="findProvince" parameterType="java.lang.Integer" resultMap="BaseResultMap">
select id,name from china_citys
WHERE id = #{id}
</select>
<select id="findChildren" parameterType="java.lang.Integer" resultMap="BaseResultMap">
select id,name from china_citys
WHERE upid = #{id}
</select>
原文地址:https://www.jb51.cc/wenti/3283692.html
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