Question

我要求将数据从excel转换为树结构。因为我将使用EXTJS树面板，所以我需要将java对象存储为JSON格式：

Logic
---Propositional Logic
---Predicate Logic
---Modal Logic
-------Stit logic
-------Doxastic logic
---Temporal logic

我从excel表读取数据并使用multimap将每个键与多个值相关联。存储在多地图后的我的i / p：[逻辑=＆gt;命题逻辑，谓词，模态，时间] [模态逻辑= stit，doxastic]

在stackoverflow论坛中搜索时，我发现了一个示例代码，如下所示：我在这个函数中发送了multimap。我试图将它用于我的目标并添加gson代码以进行测试。

public static Set <Tree> transform(Map <String, List<String>> input) {

    // Potential tree roots.  We start with all LHS keys as potential roots,
    // and eliminate them when we see their keys on the RHS.
    Set<String> roots = new HashSet<String>(input.keySet());

    // This map associates keys with the tree nodes that we create for them
    Map<String, Tree> map = new HashMap<String, Tree>();

   Gson gs = new Gson();
   String jsonString = null;

    for (Map.Entry<String, List<String>> entry : input.entrySet()) {
        String key = entry.getKey();
        List<String> childKeys = entry.getValue();
        Tree tree = map.get(key);
        if (tree == null) {
            tree = new Tree(key);
            map.put(key, tree);
        }
        for (String childKey : childKeys) {
           roots.remove(childKey);
            Tree child = map.get(childKey);
            if (child == null) {
                child = new Tree(childKey);
                map.put(childKey, child);
            }
            tree.addChild(child);
            jsonString =gs.toJson(tree);
        }


       System.out.println(jsonString);

    }

    Set<Tree> res = new HashSet<Tree>(roots.size());
    for (String key : roots) {
        res.add(map.get(key));
    }
   return res;
}

我也有一个Tree类：

public class Tree{

    private String  key;
    private boolean leaf;
    private List<Tree> children = new ArrayList<Tree>();

    public Tree(String key)
    {
        this.key=key;
        leaf=true;
    }

    public void addChild(Tree child)
    {
        children.add(child);
        leaf=false;
    }

}

我得到的是：

{"key":"Logic","leaf":false,"children":[{"key":"Propositional Logic","leaf":true,"children":[]},{"key":"Predicate Logic","leaf":true,"children":[]},{"key":"Modal Logic","leaf":true,"children":[]},{"key":"Temporal Logic","leaf":true,"children":[]}]}

{"key":"Modal Logic","leaf":false,"children":[{"key":"STIT logic","leaf":true,"children":[]},{"key":"Doxastic Logic","leaf":true,"children":[]}]}

但我想要o / p就像：

{"key":"Logic","leaf":false,"children":[{"key":"Propositional Logic","leaf":true,"children":[]},{"key":"Predicate Logic","leaf":true,"children":[]},{"key":"Modal Logic","leaf":true,"children":[{"key":"STIT logic","leaf":true,"children":[]},{"key":"Doxastic Logic","leaf":true,"children":[]},{"key":"Coalition Logic","leaf":true,"children":[]}},{"key":"Temporal Logic","leaf":true,"children":[]}]}

我对Java编程不是很熟悉所以我对此感到困惑。在上面的代码中应该添加什么，请您建议吗？

由于

如何实现json树结构格式

0 个答案: