将 JSONObject 转换为 Java 对象
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Converting JSONObject to Java Object
提问by Richard
I made a rest call to a service and stored the response in a JSONObject. However, I am trying to convert it to a class object and getting errors. Here's my code:
我对服务进行了休息调用并将响应存储在JSONObject. 但是，我正在尝试将其转换为类对象并出现错误。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");
Here's what the response looks like:
下面是响应的样子：
{
"userIdentifier": {
"uid": "ee63a52cda7bf411dd8603ac196951aa77",
"code": "63a5297e7bf411dd8603ac196951aa77",
"retailId": "860658787",
"pointOfEntry": "RETAIL"
},
"resultCode": true
}
And here's what the UserIdentifierclass looks like:
这就是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;
}
}
But I get the error:
但我收到错误：
java.lang.ClassCastException: org.json.JSONObject cannot be cast to app.identity.UserIdentifier
What am I doing wrong?
我究竟做错了什么？
Edit 1:Here's the attempt at using gson from the answers:
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);
But I get the error:
但我收到错误：
org.json.JSONException: JSONObject["userIdentifier"] not a string.
at org.json.JSONObject.getString(JSONObject.java:658) ~[json-20140107.jar:na]
采纳答案by Richard
Figured out what the problem was. Needed to extract the jsonobject instead of getting the string. Here was the line that fixed the issue:
想通了是什么问题。需要提取 jsonobject 而不是获取字符串。这是解决问题的行：
UserIdentifier userIdentifier = gson.fromJson(jsonResponse.getJSONObject("userIdentifier").toString(), UserIdentifier.class);
回答by Noor Nawaz
Use Gson library
使用 Gson 库
Gson gson=new GsonBuilder().create();
UserIdentifier userIdentifier=gson.fromJson(jsonString,UserIdentifier.class);
In your case jsonString is resourceResponse
在你的情况下 jsonString 是resourceResponse
For details study Gson documentation
有关详细信息，请研究Gson 文档
回答by fernandojne
the things is that you can't cast the object that return in the get method like this, One solution could be this, using GSONlibrary:
问题是你不能像这样转换在 get 方法中返回的对象，一种解决方案可能是这样，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);
回答by Mahesh Giri
You may need use gson
您可能需要使用 gson
class Name{
String resultCode;
UserIdentifier useridentifier;
//getters
}
Gson gson=new Gson();
Name name=gson.fromJson(jsonString,Name.class);
