# 示例
系统管理
|- 用户管理
|- 添加用户
店铺管理
|- 商品管理
|- 添加商品
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# 数据转换成tree树
// 构建node列表
List<TreeNode<String>> nodeList = CollUtil.newArrayList();
nodeList.add(new TreeNode<>("1", "0", "系统管理", 5));
nodeList.add(new TreeNode<>("11", "1", "用户管理", 222222));
nodeList.add(new TreeNode<>("111", "11", "用户添加", 0));
nodeList.add(new TreeNode<>("2", "0", "店铺管理", 1));
nodeList.add(new TreeNode<>("21", "2", "商品管理", 44));
nodeList.add(new TreeNode<>("221", "2", "商品管理2", 2));
List<Tree<String>> treeList = TreeUtil.build(nodeList, "0");
System.out.println (JSONObject.toJSONString (treeList));
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# 自定义字段名
//配置
TreeNodeConfig treeNodeConfig = new TreeNodeConfig();
// 自定义属性名 都要默认值的
treeNodeConfig.setWeightKey("order");
treeNodeConfig.setIdKey("rid");
// 最大递归深度
treeNodeConfig.setDeep(3);
//转换器
List<Tree<String>> treeNodes = TreeUtil.build(nodeList, "0", treeNodeConfig,
(treeNode, tree) -> {
tree.setId(treeNode.getId());
tree.setParentId(treeNode.getParentId());
tree.setWeight(treeNode.getWeight());
tree.setName(treeNode.getName());
// 扩展属性 ...
tree.putExtra("extraField", 666);
tree.putExtra("other", new Object());
});
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提示
通过TreeNodeConfig我们可以自定义节点的名称、关系节点id名称，这样就可以和不同的数据库做对应。
# 代码示例
// 构建node列表
List<TreeNode<String>> nodeList = CollUtil.newArrayList();
Map<String, Object> map = new HashMap<>();
map.put ("desc", "描述");
nodeList.add(new TreeNode<>("1", "0", "系统管理", 5));
nodeList.add(new TreeNode<>("11", "1", "用户管理", 222222));
nodeList.add(new TreeNode<>("111", "11", "用户添加", 0));
nodeList.add(new TreeNode<>("2", "0", "店铺管理", 1));
nodeList.add(new TreeNode<>("21", "2", "商品管理", 44));
nodeList.add(new TreeNode<>("221", "2", "商品管理2", 2));
nodeList.add(new tree ("2212", "2", "商品管理2", 2,"ab"));
List<Tree<String>> treeList = TreeUtil.build(nodeList, "0");
System.out.println (JSONObject.toJSONString (treeList));
//配置
TreeNodeConfig treeNodeConfig = new TreeNodeConfig();
// 自定义属性名 都要默认值的
treeNodeConfig.setWeightKey("order");
treeNodeConfig.setIdKey("rid");
// 最大递归深度
treeNodeConfig.setDeep(3);
//转换器
List<Tree<String>> treeNodes = TreeUtil.build(nodeList, "0", treeNodeConfig,
(treeNode, tree) -> {
JSONObject jsonObject = JSONObject.parseObject (JSONObject.toJSONString (treeNode));
System.out.println (jsonObject.getString ("description"));
System.out.println (JSONObject.toJSONString (treeNode));
tree.setId(treeNode.getId());
tree.setParentId(treeNode.getParentId());
tree.setWeight(treeNode.getWeight());
tree.setName(treeNode.getName());
// 扩展属性 ...
tree.putExtra("extraField", jsonObject.getString ("description"));
tree.putExtra("other", new Object());
});
System.out.println (JSONObject.toJSONString (treeNodes));
public class tree extends TreeNode{
private String description;
public String getDescription () {
return description;
}
public void setDescription (String description) {
this.description = description;
}
public tree(String id, String parentId, String name, Comparable<?> weight,String desc){
this.setId (id);
this.setParentId (parentId);
this.setName (name);
if (weight != null) {
this.setWeight (weight);
}
this.setDescription (desc);
}
}
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