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                JSON Schema指定JSON文件的結構。 JSON Schema可以用于驗證發送/接受于RESTful Web服務的內容。 JSON Schema都寫在JSON里。 在http://json-schema.org可以找到主要的JSON Schema。JSON Schema是一個正在發展的Schema- JSON的架構團隊剛剛發布0.4版本,在http://tools.ietf.org/html/draft-zyp-json-schema-04\. 可以找到跟多細節信息。 一些重要的JSON Schema結構包括: | **CONSTRUCT** | **DESCRIPTION** | | --- | --- | | type | The data type – object, array, string, number, etc. | | $schema | The URI that provides the schema version. | | required | true/false | | id | Data element id | | properties | Validation properties for a data element include type (see above), minimum – minimum value, maximum – maximum value, enum, etc. | 下面的例子用一個簡單的JSON Schema驗證網上禮品登記信息的一部分內容: ~~~ { "type": "object", "$schema": "http://json-schema.org/draft-03/schema", "id": "#", "required": true, "properties": { "registrants": { "type": "array", "id": "registrants", "required": true, "items": { "type": "object", "required": false, "properties": { "address": { "type": "object", "id": "address", "required": true, "properties": { "city": { "type": "string", "id": "city", "required": true }, "country": { "type": "string", "id": "country", "required": false }, "line1": { "type": "string", "id": "line1", "required": true }, "line2": { "type": "string", "id": "line2", "required": false }, "postalCode": { "type": "string", "id": "postalCode", "required": true }, "premise": { "type": "string", "id": "premise", "required": true, "enum": [ "work", "home", "other" ] }, "stateOrProvince": { "type": "string", "id": "stateOrProvince", "required": true } } }, "firstName": { "type": "string", "id": "firstName", "required": true }, "lastName": { "type": "string", "id": "lastName", "required": true }, "phoneNumber": { "type": "object", "id": "phoneNumber", "required": true, "properties": { "channel": { "type": "string", "id": "channel", "required": true, "enum": [ "cell", "work", "home" ] }, "number": { "type": "string", "id": "number", "required": true } } } } } } } } ~~~ ### 上面的schema: * 需要注冊對象的數組。 * 限制電話號碼字段為下列值:手機,工作電話,傳真或者和家用電話 * 限制地址字段為:家庭地址,工作地址,或其他。 一個Web服務的消費者可以使用這個模式來驗證下面的JSON文件: ~~~ { "registrants": [ { "firstName": "Fred", "lastName": "Smith", "phoneNumber": { "channel": "cell", "number": "303-555-1212" }, "address": { "premise": "home", "line1": "555 Broadway NW", "line2": "# 000", "city": "Denver", "stateOrProvince": "CO", "postalCode": "88888", "country": "USA" } } ] } ~~~ ## JSON Schema生成器 創建一個JSON Schema非常的繁瑣,而且容易出錯的。使用JSON Schema生成器,可以生成任何有效JSON文件的Schema。訪問在線JSON模式發生器(www.jsonschema.net/),并通過執行以下操作生成模式: * 粘貼JSON文件到右邊的文本區域。 * 選擇JSON輸入選項。 * 按生成模式按鈕。 ### JSON Schema 驗證器 應用程序使用JSON Schema驗證器,以確保JSON文件符合Schema指定的結構。 JSON Schema驗證器可用于大多數現代編程語言中: | **JSON SCHEMA VALIDATOR** | **LANGUAGE** | **SOURCE** | | --- | --- | --- | | JSV | JavaScript | [https://github.com/garycourt/JSV](https://github.com/garycourt/JSV) | | Ruby JSON Schema Validator | Ruby | [https://github.com/hoxworth/json-schema](https://github.com/hoxworth/json-schema) | | json-schema-validator | Java | [https://github.com/fge/json-schema-validator](https://github.com/fge/json-schema-validator) | | php-json-schema (by MIT) | PHP | [https://github.com/hasbridge/php-json-schema](https://github.com/hasbridge/php-json-schema) | | JSON.Net | .NET | [http://james.newtonking.com/projects/json-net.aspx](http://james.newtonking.com/projects/json-net.aspx) | 除了基于特定語言的模式驗證工具,有一個非常棒的在線JSON Schema驗證器:http://json-schema-validator.herokuapp.com。要使用該網站,只需輸入JSON文件和Schema到相應的文本框中,然后按驗證按鈕即可。
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