Java 读取json

代码：
 1 package com.util;
 2 import com.alibaba.fastjson.JSON;
 3 import com.alibaba.fastjson.JSONArray;
 4 import com.alibaba.fastjson.JSONObject;
 5 
 6 
 7 import java.io.*;
 8 public class Josn_load {
 9      //读取json文件
10     public static String readJsonFile(String fileName) {
11         String jsonStr = "";
12         try {
13             File jsonFile = new File(fileName);
14             FileReader fileReader = new FileReader(jsonFile);
15             Reader reader = new InputStreamReader(new FileInputStream(jsonFile),"utf-8");
16             int ch = 0;
17             StringBuffer sb = new StringBuffer();
18             while ((ch = reader.read()) != -1) {
19                 sb.append((char) ch);
20             }
21             fileReader.close();
22             reader.close();
23             jsonStr = sb.toString();
24             return jsonStr;
25         } catch (IOException e) {
26             e.printStackTrace();
27             return null;
28         }
29     }
30     
31     public static void main(String[] args) {
32         String path = "E:\Myeclipse\WorkPlace_graduate\基于合同纠纷知识图谱构建及应用\WebContent\data\data_node.json";
33         String s = readJsonFile(path);
34         JSONObject jobj = JSON.parseObject(s);
35         JSONArray Nodes = jobj.getJSONArray("Nodes");//构建JSONArray数组
36         for (int i = 0 ; i < Nodes.size();i++){
37             JSONObject key = (JSONObject)Nodes.get(i);
38             String symbolSize = (String)key.get("name");
39             System.out.println(key.get("symbolSize"));
40             System.out.println(symbolSize);
41         }
42     }
43 }
JSON：