反序列化地图 格森

对我来说这段代码：

public class Main {    public static void main(String[] args) throws IOException {    GsonBuilder builder = new GsonBuilder();    builder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES);    Gson gson = builder.create();    FileInputStream inputStream = new FileInputStream(new File("bobi.json"));    InputStreamReader reader = new InputStreamReader(inputStream);    User user = gson.fromJson(reader, User.class);    System.out.println(user.getName());    System.out.println(user.getId());    for (String property : user.getProperties().keySet()) {        System.out.println("Key: " + property + " value: " + user.getProperties().get(property));    }    reader.close();}

打印此：

azerty123456789Key: p1 value: 1.0Key: p2 value: testKey: p3 value: [1.0, 2.0, 3.0, 4.0]Key: p4 value: {}

但是，请记住，我在解析的文件中剥离了包装的json对象。该文件是：

{        "id":"123456789",        "name" : "azerty",        "emailHash":"123456789",         "properties": { "p1":1, "p2":"test", "p3":[1, 2, 3, 4], "p4":{ }        }}

我还为

name

id

User

import java.util.Map;class User {    private String id;    private String name;    private Map<String, Object> properties;    public String getId() {        return id;    }    public void setId(String id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Map<String, Object> getProperties() {        return properties;    }    public void setProperties(Map<String, Object> properties) {        this.properties = properties;    }}