从 Magento 设计 Java 个对象 JSON

Question

下面是从 Magento REST API 调用返回的原始 JSON 字符串：

{  
   "1":{  
      "entity_id":"1",
      "website_id":"1",
      "email":"john.oliver@hbo.com",
      "group_id":"1",
      "created_at":"2015-04-21 12:47:00",
      "disable_auto_group_change":"0",
      "prefix":null,
      "firstname":"John",
      "middlename":null,
      "lastname":"Oliver",
      "suffix":null,
      "taxvat":null,
      "created_in":"Admin"
   },
   "2":{  
      "entity_id":"2",
      "website_id":"1",
      "email":"beck.johnson@yahoo.com",
      "group_id":"1",
      "created_at":"2015-04-21 13:40:48",
      "disable_auto_group_change":"0",
      "prefix":null,
      "firstname":"Beckie",
      "middlename":null,
      "lastname":"Johnson",
      "suffix":null,
      "taxvat":null,
      "created_in":"Admin"
   }
}

我想第一次构建 POJO，这里是 classes:

public class Customers {

    private Map<String, Customer> customerMap;

    public Map<String, Customer> getCustomerMap() {
        return customerMap;
    }

    public void setCustomerMap(Map<String, Customer> customerMap) {
        this.customerMap = customerMap;
    }
}

public class Customer {
    private String entity_id;
    private String website_id;
    private String email;
    private String group_id;
    private String created_at;
    private String disable_auto_group_change;
    private String prefix;
    private String firstname;
    private String middlename;
    private String lastname;
    private String suffix;
    private String taxvat;
    private String created_in;
    public String getEntity_id() {
        return entity_id;
    }
    public void setEntity_id(String entity_id) {
        this.entity_id = entity_id;
    }
    public String getWebsite_id() {
        return website_id;
    }
    public void setWebsite_id(String website_id) {
        this.website_id = website_id;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getGroup_id() {
        return group_id;
    }
    public void setGroup_id(String group_id) {
        this.group_id = group_id;
    }
    public String getCreated_at() {
        return created_at;
    }
    public void setCreated_at(String created_at) {
        this.created_at = created_at;
    }
    public String getDisable_auto_group_change() {
        return disable_auto_group_change;
    }
    public void setDisable_auto_group_change(String disable_auto_group_change) {
        this.disable_auto_group_change = disable_auto_group_change;
    }
    public String getPrefix() {
        return prefix;
    }
    public void setPrefix(String prefix) {
        this.prefix = prefix;
    }
    public String getFirstname() {
        return firstname;
    }
    public void setFirstname(String firstname) {
        this.firstname = firstname;
    }
    public String getMiddlename() {
        return middlename;
    }
    public void setMiddlename(String middlename) {
        this.middlename = middlename;
    }
    public String getLastname() {
        return lastname;
    }
    public void setLastname(String lastname) {
        this.lastname = lastname;
    }
    public String getSuffix() {
        return suffix;
    }
    public void setSuffix(String suffix) {
        this.suffix = suffix;
    }
    public String getTaxvat() {
        return taxvat;
    }
    public void setTaxvat(String taxvat) {
        this.taxvat = taxvat;
    }
    public String getCreated_in() {
        return created_in;
    }
    public void setCreated_in(String created_in) {
        this.created_in = created_in;
    }

}

然后，我尝试使用 Gson 进行解析：

Gson gson = new Gson();
Customers customers = gson.fromJson(response.getBody(), Customers.class);
System.out.println(customers.getCustomerMap());

但是结果是null.

我怀疑 class 格式可能有误，有人可以建议什么是正确的格式吗？每组开头的数字1和2由Magento自动生成。

Answer 1

这在默认情况下不起作用，因为 Gson 需要一个名为 "customerMap" 的字段才能使用默认反序列化。最简单的（不一定是最好的）解决方案就是这样做：

String jsonText = "{\"customerMap\":"+response.getBody()+"}";
Customers customers = gson.fromJson(jsonText, Customers.class);

通过在映射的外部添加字段名称，Gson 知道要做什么，并且 println 将输出，例如：

{1=Customer@2f56a6be, 2=Customer@61dd1c39}

不过最好写个custom deserializer for your Customers class，或者修改Magneto的输出，加上周围的{"customerMap":和}

不要尝试这样做:

Map<String, Customer> cust = gson.fromJson(jsonText, Map.class);

这将 实际上 生成类型 Map<String, LinkedTreeMap> 的 Map，其中 LinkedTreeMap 是一个内部 gson class。

从 Magento 设计 Java 个对象 JSON

Designing Java Objects from Magento JSON

java

json

magento

gson