将JSONObject转换为Java对象
我对服务进行了调用,并将响应存储在中JSONObject
。但是,我试图将其转换为类对象并得到错误。这是我的代码:
RestOperations operations = /*initalize*/;String body = /*build request body*/;
String resourceResponse = operations.postForObject(/* url */, body, String.class);
JSONObject jsonResponse = new JSONObject(resourceResponse);
UserIdentifier userIdentifier = (UserIdentifier) jsonResponse.get("userIdentifier");
响应如下所示:
{ "userIdentifier": {
"uid": "ee63a52cda7bf411dd8603ac196951aa77",
"code": "63a5297e7bf411dd8603ac196951aa77",
"retailId": "860658787",
"pointOfEntry": "RETAIL"
},
"resultCode": true
}
这是UserIdentifier
该类的样子:
public class UserIdentifier { private String uid;
private String code;
private String retailId;
public UserIdentifier() {
}
public UserIdentifier(String uid, String code, String retailId) {
this.uid = uid;
this.code = code;
this.retailId = retailId;
}
public String getuid() {
return uid;
}
public void setuid(String uid) {
this.uid = uid;
}
public String getcode() {
return code;
}
public void setcode(String code) {
this.code = code;
}
public String getretailId() {
return retailId;
}
public void setretailId(String retailId) {
this.retailId = retailId;
}
}
但是我得到了错误:
java.lang.ClassCastException: org.json.JSONObject cannot be cast to app.identity.UserIdentifier
我究竟做错了什么?
这是从答案中使用gson的尝试:
Gson gson = new GsonBuilder().create();String body = /*build request body*/;
String resourceResponse = operations.postForObject(/* url */, body, String.class);
JSONObject jsonResponse = new JSONObject(resourceResponse);
UserIdentifier userIdentifier = gson.fromJson(jsonResponse.getString("userIdentifier"), UserIdentifier.class);
但是我得到了错误:
org.json.JSONException: JSONObject["userIdentifier"] not a string. at org.json.JSONObject.getString(JSONObject.java:658) ~[json-20140107.jar:na]
回答:
找出问题所在。需要提取jsonobject而不是获取字符串。这是解决此问题的行:
UserIdentifier userIdentifier = gson.fromJson(jsonResponse.getJSONObject("userIdentifier").toString(), UserIdentifier.class);
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