有时候JSON 数据格式需要校验是否合法，我们可以使用 JsonSchema 来校验数据是否合法。
引入 pom.xml
<dependency>
<groupId>com.networknt</groupId>
<artifactId>json-schema-validator</artifactId>
<version>1.4.0</version>
</dependency>import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.networknt.schema.JsonSchema;
import com.networknt.schema.JsonSchemaFactory;
import com.networknt.schema.SpecVersion;
import com.networknt.schema.ValidationMessage;
import java.util.Set;
public class ValidJson {
public static void main(String[] args) throws JsonProcessingException {
String json="{\n" +
" \"$schema\": \"http://json-schema.org/draft-07/schema#\",\n" +
" \"title\": \"Order Event\",\n" +
" \"description\": \"Order event schema for example\",\n" +
" \"required\": [\"order_id\", \"total_price\", \"products\" ],\n" +
" \"properties\": {\n" +
" \"order_id\": {\n" +
" \"type\": \"string\"\n" +
" },\n" +
" \"event\": {\n" +
" \"enum\": [\"PLACED\", \"DELIVERED\", \"RETURNED\"],\n" +
" \"type\": \"string\"\n" +
" },\n" +
" \"total_price\": { \n" +
" \"type\": \"number\",\n" +
" \"minimum\": 0\n" +
" },\n" +
" \"products\": {\n" +
" \"type\": \"array\",\n" +
" \"items\": {\n" +
" \"additionalProperties\": true,\n" +
" \"required\": [\"product_id\", \"price\"],\n" +
" \"minItems\": 1,\n" +
" \"properties\": {\n" +
" \"product_id\": {\n" +
" \"type\": \"string\"\n" +
" },\n" +
" \"price\": {\n" +
" \"type\": \"number\",\n" +
" \"minimum\": 0\n" +
" },\n" +
" \"quantity\": {\n" +
" \"type\": \"integer\"\n" +
" }\n" +
" }\n" +
" }\n" +
" }\n" +
" }\n" +
"}";
String json2="{\n" +
" \"order_id\":\"order134\",\n" +
" \"event\": \"PLACED\",\n" +
" \"products\": [\n" +
" {\n" +
" \"product_id\": \"product_1\",\n" +
" \"price\":20.5,\n" +
" \"quantity\":2\n" +
" }\n" +
" ],\n" +
" \"total_price\": 41\n" +
"}";
JsonSchema jsonSchema = jsonSchema(json);
ObjectMapper objectMapper = new ObjectMapper();
JsonNode jsonNode = objectMapper.readTree(json2);
String str= validateJson(jsonSchema,jsonNode);
System.err.println(str);
}
public static JsonSchema jsonSchema(String schema) {
return JsonSchemaFactory
.getInstance( SpecVersion.VersionFlag.V7 )
.getSchema(schema);
}
public static String validateJson(JsonSchema jsonSchema, JsonNode jsonNode){
Set<ValidationMessage> errors = jsonSchema.validate(jsonNode);
return errors.toString();
}
}
