如何将json转换为普通对象? [英] How to convert json to normal object?

问题描述

字符串数组以JSON格式存储在al arraylist中.现在我想将该arraylist转换为普通对象.我该如何转换?

An array of strings is stored in al arraylist which is in JSON format. Now i want to Convert that arraylist into normal object. How do i convert it?

public class Json {

    public static void main(String[] args) {

    ArrayList al = new ArrayList();
    al.add(1);
    al.add("Lokesh");
    al.add("Gupta");
    al.add(Arrays.asList("ADMIN", "MANAGER"));

    Gson gson = new Gson();
    System.out.println(gson.toJson(al));
}}

推荐答案

使用属性创建对象， 例如:-

Create an Object with your attributes, eg:-

public class User {
    Integer id;
    String firstName,
    String lastName;
    List<Role> roles;// Where roles is a list of another Object Role
    //getter and setter methods
}

然后

    public class Manager{
        public static void main(String[] args) {
            String json = "{'id':1,'firstName':'Deva','lastName':'Raj','roles':['ADMIN','MANAGER']}";
            Gson gson = new Gson();
            User user = gson.fromJson(json, User.class);
            System.out.println(user);
        }
    }

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