Question

android JSON文件解析为类对象 出现以下错误，求解答。

Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 123
JSON文件：
{
"Data": {
"uid": 19880890,
"token": "d8dc52ba46e84685ab5549c01764dd9b",
"name": "benlixmu@gmail.com"
},
"Detail": "登入成功",
"Return": "0"
}
类对象
public class LoginData {
public Data Data;
public String Detail;
public string Return;

public static class Data {

public String name;
private String token;
public int uid;

}
}
解析语句：
LoginData loginData = json.fromJson(jsonData, LoginData.class);

jsonDate就是获得的JSON文件内容
public string Return;改为char型就OK了。

Answer 1

　　用Gson解析json数据是可以的, 如果你非要把解析对象写成类嵌套的形式,就必须要参考gson的用户指南.这是截图:

　　:最好的办法是不要用类嵌套. 直接写两个类接即可

　　public class LoginData {
        public Data Data;
        public String Detail;
        public string Return;

    
    }
    public static class Data {

        public String name;
        private String token;
        public int uid;

    }

Answer 2

你要定义类的get和set方法，然后属性名字要用小写，其次return不要用，这是java关键字

public class LoginData {
private Data data;
private String detail;
private String retur;
public Data getData() {
return data;
}
public void setData(Data data) {
this.data = data;
}
public String getDetail() {
return detail;
}
public void setDetail(String detail) {
this.detail = detail;
}
public String getRetur() {
return retur;
}
public void setRetur(String retur) {
this.retur = retur;
}
}

public class Data {
private int uid;
private String name;
private String token;

public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getToken() {
return token;
}
public void setToken(String token) {
this.token = token;
}
public int getUid() {
return uid;
}
public void setUid(int uid) {
this.uid = uid;
}

}

测试类
public class Test {
public static void main(String[] args) {
String json="{\"data\":{\"uid\":19880890,\"token\":\"d8dc52ba46e84685ab5549c01764dd9b\",\"name\": \"benlixmu@gmail.com\"}, \"detail\": \"登入成功\",\"retur\": \"0\"}";
JSONObject object = JSONObject.fromObject(json);
Map<String, Class> classMap = new HashMap<String, Class>();
classMap.put("data", Data.class);
LoginData loginData = (LoginData) JSONObject.toBean(object, LoginData.class,classMap);

System.err.println(loginData.getData().getName());
}

}