我一直在努力學習 GSON，但我正在努力學習。我正在嘗試使用 GSON 將 JSON 文件反序列化為 Java 對象。我已經在這裡閱讀了一百萬個其他問題，對於我的一生，我無法理解我做錯了什麼。
這是我的 JSON 文本：
{
"movies": [
{
"name": "The Shawshank Redemption",
"url": "https://parsehub.com/sandbox/moviedetails?movie=The%20Shawshank%20Redemption",
"IMAX": "06:00 PM",
"rating": "9 . 2",
"cast": [
{
"character": "Andy Dufresne",
"actor": "Tim Robbins"
},
{
"character": "Ellis Boyd 'Red' Redding",
"actor": "Morgan Freeman"
},
{
"character": "Warden Norton",
"actor": "Bob Gunton"
},
{
"character": "Heywood",
"actor": "William Sadler"
}
]
},
{
"name": "Schindler's List",
"url": "https://parsehub.com/sandbox/moviedetails?movie=Schindler%27s%20List",
"IMAX": "06:15 PM",
"rating": "8 . 9",
"cast": [
{
"character": "Oskar Schindler",
"actor": "Liam Neeson"
},
{
"character": "Itzhak Stern",
"actor": "Ben Kingsley"
},
{
"character": "Amon Goeth",
"actor": "Ralph Fiennes"
}
]
}
]
}
這是我的 Java 代碼：
import com.google.gson.Gson;
import java.io.*;
import java.lang.reflect.Type;
import java.util.ArrayList;
public class Main {
public static void main(String[] args) throws FileNotFoundException {
Gson gson = new Gson();
Movies[] movies = gson.fromJson(new FileReader("src/main/input.json"), (Type) Movies.class);
System.out.println(movies[0]);
}
class Movies {
String name;
String url;
String IMAX;
String rating;
ArrayList<Cast> cast;
}
class Cast {
ArrayList<CastMember> castMembers;
}
class CastMember{
String character;
String actor;
}
}
當我運行它時，我收到以下錯誤：
Exception in thread "main" java.lang.ClassCastException: class com.Main$Movies cannot be cast to class [Lcom.Main$Movies; (com.Main$Movies and [Lcom.Main$Movies; are in unnamed module of loader 'app')
at com.Main.main(Main.java:13)
您正在反序列化的 JSON 表示一個帶有對象列表的對象。您嘗試反序列化的 Java 對象需要與之匹配。
首先，創建一個新類MovieList。
class MovieList {
List<Movie> movies;
}
將您的Movies類更新為 call Movie，因為它代表一部電影。
class Movie {
String name;
String url;
String IMAX;
String rating;
List<Cast> cast;
}
現在嘗試gson.fromJson(...)使用以下命令調用
MovieList movieList = gson.fromJson(new FileReader("src/main/input.json"), MovieList.class);
System.out.println(movieList.getMovies().get(0));
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