在Java中使用Jackson支持JSON Schema吗？

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JSON Schema是一种基于JSON格式的规范，用于定义JSON数据的结构。JsonSchema类可以为给定应用程序所需的JSON数据提供合同，并指导如何与其进行交互。JsonSchema可以定义JSON数据的验证、文档、超链接导航和交互控制。我们可以使用JsonSchemaGenerator的generateSchema()方法生成JSON模式，该类封装了JSON模式生成功能。

语法

public JsonSchema generateSchema(Class<T><!--?--> type) throws com.fasterxml.jackson.databind.JsonMappingException

Example

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.module.jsonSchema.JsonSchema;
import com.fasterxml.jackson.module.jsonSchema.JsonSchemaGenerator;
import java.util.List;
public class JSONSchemaTest {
   public static void main(String[] args) throws JsonProcessingException {
      ObjectMapper jacksonObjectMapper = new ObjectMapper();
      JsonSchemaGenerator schemaGen = new JsonSchemaGenerator(jacksonObjectMapper);
      JsonSchema schema = schemaGen.generateSchema(Person.class);
      String schemaString = jacksonObjectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(schema);
      System.out.println(schemaString);
   }
}
// Person class
class Person {
   private String name;
   private int age;
   private List<String> courses;
   private Address address;
   public String getName() {
      return name;
   }
   public int getAge(){
      return age;
   }
   public List<String> getCourse() {
      return courses;
   }
   public Address getAddress() {
      return address;
   }
}
// Address class
class Address {
   private String firstLine;
   private String secondLine;
   private String thirdLine;
   public String getFirstLine() {
      return firstLine;
   }
   public String getSecondLine() {
      return secondLine;
   }
   public String getThirdLine() {
      return thirdLine;
   }
}

输出

{
   "type" : "object",
   "id" : "urn:jsonschema:Person",
   "properties" : {
      "name" : {
         "type" : "string"
      },
      "age" : {
         "type" : "integer"
      },
      "address" : {
         "type" : "object",
         "id" : "urn:jsonschema:Address",
         "properties" : {
            "firstLine" : {
               "type" : "string"
            },
            "secondLine" : {
               "type" : "string"
            },
            "thirdLine" : {
               "type" : "string"
            }
         }
      },
      "course" : {
         "type" : "array",
         "items" : {
            "type" : "string"
         }
      }
   }
}