将JSONObject转换为Java对象
我对服务进行了rest调用,并将响应存储在JSONObject
。 但是,我试图将其转换为类对象并获取错误。 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");
这是响应的样子:
{ "userIdentifier": { "uid": "ee63a52cda7bf411dd8603ac196951aa77", "code": "63a5297e7bf411dd8603ac196951aa77", "retailId": "860658787", "pointOfEntry": "RETAIL" }, "resultCode": true }
这是UserIdentifier
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; } }
但我得到错误:
java.lang.ClassCastException: org.json.JSONObject cannot be cast to app.identity.UserIdentifier
我究竟做错了什么?
编辑1: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);
但我得到错误:
org.json.JSONException: JSONObject["userIdentifier"] not a string. at org.json.JSONObject.getString(JSONObject.java:658) ~[json-20140107.jar:na]
你可能需要使用gson
class Name{ String resultCode; UserIdentifier useridentifier; //getters } Gson gson=new Gson(); Name name=gson.fromJson(jsonString,Name.class);
找出问题所在。 需要提取jsonobject而不是获取字符串。 以下是解决问题的方法:
UserIdentifier userIdentifier = gson.fromJson(jsonResponse.getJSONObject("userIdentifier").toString(), UserIdentifier.class);
使用Gson库
Gson gson=new GsonBuilder().create(); UserIdentifier userIdentifier=gson.fromJson(jsonString,UserIdentifier.class);
在你的情况下,jsonString是resourceResponse
有关详细信息,请参阅Gson文档
事情是你不能像这样GSON
在get方法中返回的对象,一个解决方案就是这样,使用GSON
库:
RestOperations operations = /*initalize*/; String body = /*build request body*/; Gson gson = new Gson(); String resourceResponse = operations.postForObject(/* url */, body, String.class); JSONObject jsonResponse = new JSONObject(resourceResponse); String jsonUserIdentifier = jsonResponse.getString("userIdentifier"); UserIdentifier userIdentifier = gson.fromJson(jsonUserIdentifier , UserIdentifier.class);