[英]Creating JSON Object for D3 Hierarchical Graph
我正在嘗試從 Java 創建一個 JSON 對象,用於使用 D3 呈現分層圖。
JSON 的結構:
{
"name": "Homepage",
"parent": "null",
"children": [
{
"name": "Import",
"parent": "Homepage",
"children": [
{
"name": "Ready to be Imported",
"size": 1000,
"parent": "Import"
},
{
"name": "Ack with parsing error",
"size": 9,
"parent": "Import Section"
},
]
},
]
}
JSON 對象中有父子關系,我使用以下代碼創建 JSON 對象 -
import java.util.ArrayList;
import java.util.List;
import org.json.JSONException;
import com.google.gson.Gson;
public class Hirarchy {
public static class Entry {
private String name;
public Entry(String name) {
this.name = name;
}
private List<Entry> children;
public void add(Entry node) {
if (children == null)
children = new ArrayList<Entry>();
children.add(node);
}
public static void main(String[] args) throws JSONException {
List<String> listofParent = new ArrayList<String>();
listofParent.add("Import");
List<String> importChild = new ArrayList<String>();
importChild.add("Ready to be Imported");
importChild.add("Ack with parsing error");
Entry mainRoot=null;
for (int i = 0; i < listofParent.size(); i++) {
Entry root = new Entry(listofParent.get(i));
mainRoot= aMethod2form(root, importChild);
Entry e=new Entry("Homepage");
e.add(mainRoot);
Gson g=new Gson();
System.out.println(g.toJson(e));
}
}
private static Entry aMethod2form(Entry root, List<String> listofChild) throws JSONException {
for(int i=0;i<listofChild.size();i++){
root.add(new Entry(listofChild.get(i)));
}
return root;
}
}
}
使用此 java 代碼,我可以創建父子關系,但是如何為每個子項添加大小和父屬性?
您的入口類應如下所示:
public static class Entry {
private String name;
public Entry(String name) {
this.name = name;
}
private List<Entry> children;
private Entry parent; // This will contain the referenece of parent object.
public void add(Entry node) {
if (children == null)
children = new ArrayList<Entry>();
node.parent = this; // This will make the current object as parent of child object.
children.add(node);
}
}
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