Java ClassCastException: org.json.simple.JSONArray 不能转换为 org.json.simple.JSONObject
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ClassCastException: org.json.simple.JSONArray cannot be cast to org.json.simple.JSONObject
提问by kroe761
I am trying to parse a son file, and I don't know what I'm doing wrong (of course, I don't really know what I'm doing right, either).
我正在尝试解析一个子文件，但我不知道自己做错了什么（当然，我也不知道自己在做什么对）。
file.json
文件.json
[{
"arrOne":{
"one":"a",
"two":"b",
"three":"c",
"four":"d",
"five":"e"
},
"elemTwo":"f",
"elemThree":"g",
"elemFour":"h",
"elemFive":"i",
"arrSix":[{
"six":1,
"seven":2,
"eight":"j"
}]}]
code:
代码：
import java.io.FileNotFoundException;
import java.io.FileReader;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
//...........
JSONParser parser = new JSONParser();
Object obj = parser.parse(new FileReader("/path/to/file.json"));
JSONObject json = (JSONObject) obj;
String unit = (String) json.get("elemTwo");
System.out.println(unit);
I get the error ClassCastException: org.json.simple.JSONArray cannot be cast to org.json.simple.JSONObject. Truthfully, I have no idea what I'm doing. Any help would be great! Thanks!
我收到错误 ClassCastException: org.json.simple.JSONArray cannot be cast to org.json.simple.JSONObject。说实话，我不知道我在做什么。任何帮助都会很棒！谢谢！
回答by adushenin
You should cast your objtoJsonArrayinstead of JsonObject, because your json file has []at the root.
您应该使用objtoJsonArray而不是JsonObject，因为您的 json 文件[]位于根目录。
回答by Abdelhak
When the JSonParserparses the file, it's returning it as a JSONArray, to solve it try to use this:
当JSonParser解析文件时，它将它作为 a 返回JSONArray，要解决它尝试使用这个：
JSONObject obj = (JSONObject)obj;
JSONObject elem = (JSONObject)obj.get("0");
String unit = (String) elem.get("elemTwo");
System.out.println(unit);
回答by sushant gosavi
you are getting JSONArray not JsonObject
你得到的是 JSONArray 而不是 JsonObject
JSONParser parser = new JSONParser();
Object obj = parser.parse(new FileReader("/path/to/file.json"));
JSONArray json = (JSONArray) obj;
Than loop this and get jsonobject
比循环这个并获得 jsonobject
