如何阅读java中的json文件

Question

我想阅读Json文件。我的JSON文件包含内容如下

[ 
    { 
    "arguments" : [ 
     { 
     "IsEnabled" : "false", 
     "class" : "UITextField", 
     "width" : 238, 
     "parent" : { 
      "class" : "UIView", 
      "height" : 101, 
      "Y" : 192, 
      "width" : 280, 
      "X" : 20 
     }, 
     "name" : "Enter UserName", 
     "X" : 40, 
     "isRightOf" : "NA", 
     "Recording Device" : "NA", 
     "Y" : 0 
     }, 
     { 
     "data" : "Enter UserName", 
     "type" : "string" 
     } 
    ], 

    } 
] 

我也试过GSON图书馆阅读JSON file.but失败。请帮助

Answer 1

您提供的JSON是无效的（有一个无效的逗号）

[ 
    { 
    "arguments" : [ 
     { 
     "IsEnabled" : "false", 
     "class" : "UITextField", 
     "width" : 238, 
     "parent" : { 
      "class" : "UIView", 
      "height" : 101, 
      "Y" : 192, 
      "width" : 280, 
      "X" : 20 
     }, 
     "name" : "Enter UserName", 
     "X" : 40, 
     "isRightOf" : "NA", 
     "Recording Device" : "NA", 
     "Y" : 0 
     }, 
     { 
     "data" : "Enter UserName", 
     "type" : "string" 
     } 
    ], <-- this comma makes the json invalid 

    } 
] 

Answer 2

你输入JSON是错的有一个逗号丢失的建议。

Json对象很难解析，但如果你一旦得到了如何解析json数据的概念，那真的很容易。

您需要查看您尝试访问的属性是一个json数组还是一个对象。如果你是初学者，这是基本规则。

下面是代码::

OUTOUT IS ::

arguments>>>>>>>>> [{"parent":{"width":280,"X":20,"Y":192,"class":"UIView","height":101},"Recording Device":"NA","IsEnabled":"false","width":238,"name":"Enter UserName","X":40,"isRightOf":"NA","Y":0,"class":"UITextField"},{"data":"Enter UserName","type":"string"}] 
{"parent":{"width":280,"X":20,"Y":192,"class":"UIView","height":101},"Recording Device":"NA","IsEnabled":"false","width":238,"name":"Enter UserName","X":40,"isRightOf":"NA","Y":0,"class":"UITextField"} 
{"data":"Enter UserName","type":"string"} 

所以，在这里的代码，你可以看到，我有时采取JSON数组和对象的某个时候，你需要区分他们。

import java.io.FileReader; 
import java.io.IOException; 

import org.json.simple.JSONArray; 
import org.json.simple.JSONObject; 
import org.json.simple.parser.JSONParser; 


public class test { 

    public static void main(String[] args) throws IOException, InterruptedException { 
     JSONParser parser = new JSONParser(); 
     try { 
      Object obj = parser.parse(new FileReader("test.json")); 
      JSONArray jsonObject = (JSONArray) obj; 
      JSONObject arr = (JSONObject) jsonObject.get(0); 
      JSONArray arguments = (JSONArray) arr.get("arguments"); 
      System.out.println("arguments>>>>>>>>> "+arguments); 
      for(int i = 0 ; i< arguments.size() ;i++){ 
       JSONObject object = (JSONObject) arguments.get(i); 
       System.out.println(object); 
      } 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 
}