这是我创建的方法，一切都很好，但我无法将他的父亲与HashMap中的孩子联系起来。我希望有人帮助我。感谢。
public void findChild(JsonArray jarray) {
ArrayList<String> listChild = new ArrayList<String>();
HashMap<String, List<String>> hm = new HashMap<String, List<String>>();
String str = null;
JsonElement element = null;
JsonElement e;
for (int j = 0; j < jarray.size(); j++) {
e = jarray.get(j).getAsJsonObject().get("name");
JsonObject jsonObj = jarray.get(j).getAsJsonObject();
JsonArray jsonArray = jsonObj.getAsJsonArray("child");
element = jsonObj.get("name");
if (jsonArray.size() > 0) {
str = e.getAsString();
findAllChild(jsonArray);
}
listChild.add(element.getAsString());
}
hm.put(str, listChild);
System.err.println("Hash: " + hm);
}
这是我的json文件：
"name": "one",
"id":"YO",
"child": [
{
"name": "one",
"child": [
{
"id": "0001",
"name": "oneone",
"photo": "primo.jpg",
"child": [
{
"id": "1",
"name": "oneoneone",
"child": [
{
"id": "1",
"name": "oneoneoneone",
"child": [
{
"id": "1",
"name": "oneoneoneoneone"
},
{
"id": "2",
"name": "oneoneoneonetwo"
},
{
"id": "3",
"name": "oneoneoneonethree"
}
]
},
{
"id": "2",
"name": "oneoneonetwo"
},
{
"id": "3",
"name": "oneoneonethree"
}
]
},
{
"id": "2",
"name": "oneonetwo"
}
]
},
{
"id": "0002",
"name": "onetwo",
"photo": "secondo.jpg"
},
{
"id": "onethree",
"name": "terzo",
"photo": "terzo.jpg"
}
]
},
{
"name": "two",
"child": [
{
"id": "0004",
"name": "twoone",
"photo": "one.jpg"
},
{
"id": "0005",
"name": "twotwo",
"photo": "two.jpg",
"child": [
{
"id": "1",
"name": "twotwoone",
"child": [
{
"id": "1",
"name": "twotwooneone"
},
{
"id": "2",
"name": "twotwoonetwo"
},
{
"id": "3",
"name": "twotwoonethree"
}
]
},
{
"id": "2",
"name": "twotwotwo"
}
]
},
{
"id": "0006",
"name": "twothree",
"photo": "three.jpg"
}
]
}
]
}
这是我的回答：
Hash: {null=[oneoneoneoneone, oneoneoneonetwo, oneoneoneonethree]}
Hash: {oneoneoneone=[oneoneoneone, oneoneonetwo, oneoneonethree]}
Hash: {oneoneone=[oneoneone, oneonetwo]}
Hash: {oneone=[oneone, onetwo, terzo]}
Hash: {null=[twotwooneone, twotwoonetwo, twotwoonethree]}
Hash: {twotwoone=[twotwoone, twotwotwo]}
Hash: {twotwo=[twoone, twotwo, twothree]}
Hash: {two=[one, two]}
答案 0 :(得分：1)
如果要将json字符串反序列化为java对象，下面的简单代码可能会对您有所帮助。
同样从这个答案下面的评论中，我知道你需要在孩子身上保留父母的参考。
1）定义一个pojo：
public class Item {
private String name;
private String id;
private String photo;
private Item[] child;
private Item parent;
public void defineParent(Item parent) {
this.parent = parent;
if(this.child != null && this.child.length > 0) {
for (Item currentChild : this.child) {
currentChild.defineParent(this);
}
}
}
// TODO: getters / setters
}
2）将你的json反序列化为：
String json = "{\"name\":\"one\",\"id\":\"YO\",\"child\":[{\"name\":\"one\",\"child\":[{\"id\":\"0001\",\"name\":\"oneone\",\"photo\":\"primo.jpg\",\"child\":[{\"id\":\"1\",\"name\":\"oneoneone\",\"child\":[{\"id\":\"1\",\"name\":\"oneoneoneone\",\"child\":[{\"id\":\"1\",\"name\":\"oneoneoneoneone\"},{\"id\":\"2\",\"name\":\"oneoneoneonetwo\"},{\"id\":\"3\",\"name\":\"oneoneoneonethree\"}]},{\"id\":\"2\",\"name\":\"oneoneonetwo\"},{\"id\":\"3\",\"name\":\"oneoneonethree\"}]},{\"id\":\"2\",\"name\":\"oneonetwo\"}]},{\"id\":\"0002\",\"name\":\"onetwo\",\"photo\":\"secondo.jpg\"},{\"id\":\"onethree\",\"name\":\"terzo\",\"photo\":\"terzo.jpg\"}]},{\"name\":\"two\",\"child\":[{\"id\":\"0004\",\"name\":\"twoone\",\"photo\":\"one.jpg\"},{\"id\":\"0005\",\"name\":\"twotwo\",\"photo\":\"two.jpg\",\"child\":[{\"id\":\"1\",\"name\":\"twotwoone\",\"child\":[{\"id\":\"1\",\"name\":\"twotwooneone\"},{\"id\":\"2\",\"name\":\"twotwoonetwo\"},{\"id\":\"3\",\"name\":\"twotwoonethree\"}]},{\"id\":\"2\",\"name\":\"twotwotwo\"}]},{\"id\":\"0006\",\"name\":\"twothree\",\"photo\":\"three.jpg\"}]}]}";
Gson gson = new Gson();
Item item = gson.fromJson(json, Item.class);
item.defineParent(null);
编辑：父母将通过defineParent方法递归设置为子项。所以每个孩子都知道它的父母。