jsonschema2pojo：引用相同类型的对象

Question

I need to generate Java classes from a JSON schema file and came across jsonschema2pojo. However, I encountered a "problem" when using the ref keyword.

For example, if I use the following schema from http://spacetelescope.github.io/understanding-json-schema/structuring.html#extending :

{
  "$schema": "http://json-schema.org/draft-04/schema#",

  "definitions": {
    "address": {
      "type": "object",
      "properties": {
        "street_address": { "type": "string" },
        "city":           { "type": "string" },
        "state":          { "type": "string" }
      },
      "required": ["street_address", "city", "state"]
    }
  },

  "type": "object",

  "properties": {
    "billing_address": { "$ref": "#/definitions/address" },
    "shipping_address": { "$ref": "#/definitions/address" }
  }
}

As expected, it generated a class named whatever you want to call it, containing an attribute billingAddress and an attribute shippingAddress .

However, it also generated two separate classes BillingAddress and ShippingAddress even though both attributes are referencing to address . Hence, I would rather have both attributes of type Address .

Is this possible to achieve with jsonschema2pojo?

Answer 1

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Update

After getting a better understanding of javaType from here . I get the expected result by just adding a javaType in your Address definition.

{
  "$schema": "http://json-schema.org/draft-04/schema#",

  "definitions": {
      "address": {
      "type": "object",
      "javaType": "Address",
      "properties": {
        "street_address": { "type": "string" },
        "city":           { "type": "string" },
        "state":          { "type": "string" }
      },
      "required": ["street_address", "city", "state"]
    }
  },
  "type": "object",
  "properties": {
    "billing_address": { "$ref": "#/definitions/address" },
    "shipping_address": { "$ref": "#/definitions/address" }
  }
}

---

Answer with two files

You need to use javaType in your Address.json and use $ref for your billing_address and shipping address. I would suggest you to separate the address definition into a separate json and then use that in your billing_address and shipping_address.

---

Address.json

{
    "$schema": "http://json-schema.org/draft-03/hyper-schema",
    "additionalProperties": false,
    "javaType": "whatever-package-name-you-have.Address"
    "type": "object",
    "properties": {
    "street_address": { "type": "string", "required":true},
    "city":           { "type": "string", "required":true },
    "state":          { "type": "string", "required":true }
  }
}

---

MainClass.json

{
    "$schema": "http://json-schema.org/draft-03/hyper-schema",
    "additionalProperties": false,
    "type": "object",
    "properties": {
     "billing_address": {
           "$ref":"Address.json",
           "type": "object",
           "required": false
          },
     "shipping_address": {
           "$ref":"Address.json",
           "type": "object",
           "required": false
          }
     }
}