java 未定义 JSONObject 类型的方法 getJSONObject(String)
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The method getJSONObject(String) is undefined for the type JSONObject
提问by N-M25
I am returning a jsonfrom my class:
我正在json从我的班级返回一个：
@POST("/test")
@PermitAll
public JSONObject test(Map form) {
JSONObject json=new JSONObject();
json.put("key1",1);
json.put("key2",2);
return json;
}
now I want to get this json from "getInputStream" and parse it to see if key1exists:
现在我想从“ getInputStream”获取这个json并解析它以查看是否key1存在：
String output = "";
BufferedReader reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
StringBuilder output = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
output.append(line + "\n");
}
output=output.toString();
JSONObject jsonObj = new JSONObject();
jsonObj.put("output", output);
if (jsonObj.get("output") != null){
**//search for key1 in output**
System.out.println("key1 exists");
}else{
System.out.println("key1 doesnt exist");
}
reader.close();
How can I convert outputto JSONObjectand search for "key1"?
我怎么能转换output到JSONObject，搜索“KEY1”？
I tried following but I got errors after arrows:
我尝试了以下操作，但在箭头后出现错误：
JSONObject jObject = new JSONObject(output); ---> The constructor JSONObject(String) is undefined
JSONObject data = jObject.getJSONObject("data"); ---> The method getJSONObject(String) is undefined for the type JSONObject
String projectname = data.getString("name"); ----> The method getString(String) is undefined for the type JSONObject
回答by ecyshor
JSONObject jsonObject = (JSONObject) JSONValue.parse(output);
Try this.
试试这个。
And then you can verify the existence of the field using:
然后您可以使用以下方法验证该字段的存在：
jsonObject.has("key1");
回答by Quicksilver002
You need to parse the object using a parser. Check out the documentation here: https://code.google.com/p/json-simple/wiki/DecodingExamples
您需要使用解析器来解析对象。在此处查看文档：https: //code.google.com/p/json-simple/wiki/DecodingExamples
