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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