我有什么:
我正在从pojo生成JSON模式。我生成模式的代码如下所示:
ObjectMapper mapper = new ObjectMapper();
TitleSchemaFactoryWrapper visitor = new TitleSchemaFactoryWrapper();
mapper.acceptJsonFormatVisitor(clazz, visitor);
JsonSchema schema = visitor.finalSchema();
schemas.put(clazz, mapper.writerWithDefaultPrettyPrinter().writeValueAsString(schema));
我通过上面的代码生成了几个模式。其中一个pojos有一个内部嵌入枚举来限制可能的值,如下所示:
public class MyClass {
@JsonProperty("name")
private String name;
@JsonProperty("startDayOfWeek")
private MyClass.StartDayOfWeek startDayOfWeek;
/**
* The ID of a timezone returned by the timezones route.
*
*/
@JsonProperty("timezone")
private String timezone;
@JsonIgnore
private Map<String, Object> additionalProperties = new HashMap<String, Object>();
/**
*
* @return
* The startDayOfWeek
*/
@JsonProperty("startDayOfWeek")
public MyClass.StartDayOfWeek getStartDayOfWeek() {
return startDayOfWeek;
}
/**
*
* @param startDayOfWeek
* The startDayOfWeek
*/
@JsonProperty("startDayOfWeek")
public void setStartDayOfWeek(MyClass.StartDayOfWeek startDayOfWeek) {
this.startDayOfWeek = startDayOfWeek;
}
public static enum StartDayOfWeek {
MONDAY("Monday"),
TUESDAY("Tuesday"),
WEDNESDAY("Wednesday"),
THURSDAY("Thursday"),
FRIDAY("Friday"),
SATURDAY("Saturday"),
SUNDAY("Sunday");
private final String value;
private static Map<String, MyClass.StartDayOfWeek> constants = new HashMap<String, MyClass.StartDayOfWeek>();
static {
for (MyClass.StartDayOfWeek c: values()) {
constants.put(c.value, c);
}
}
private StartDayOfWeek(String value) {
this.value = value;
}
@JsonValue
@Override
public String toString() {
return this.value;
}
@JsonCreator
public static MyClass.StartDayOfWeek fromValue(String value) {
MyClass.StartDayOfWeek constant = constants.get(value);
if (constant == null) {
throw new IllegalArgumentException(value);
} else {
return constant;
}
}
}
}
上面的代码应该限制传递给“星期一”,“星期二”,“星期三”等的JSON数据中可能的字符串值。
当我在相关代码上运行架构生成器时,我希望得到类似以下架构的内容:
{
"type" : "object",
"javaType" : "my.package.MyClass",
"properties": {
"startDayOfWeek" : {
"type" : "string",
"enum" : [ "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" ]
}
}
}
但我得到了这个:
{
"type" : "object",
"id" : "urn:jsonschema:my:package:MyClass",
"title" : "Lmy/package/MyClass;",
"properties" : {
"startDayOfWeek" : {
"type" : "string"
}
}
}
我已经完成了对Jackson Schema Module源代码的一些挖掘,并发现正在发生的事情是Jackson使用“.toString()”作为枚举类型的默认序列化方法,但我需要它做的是创建基于StartDayOfWeek.values()
看起来像这样的行:
"enum" : [ "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" ]
有谁知道怎么做?
答案 0 :(得分:18)
似乎无法使用我在databind中找到的说明。然而,我发现另一个杰克森模块似乎很好地完成了这个伎俩。奇怪的是,有几个对象被命名为相同。
TLDR:使用org.codehaus.jackson.map
包中的对象而不是com.fasterxml.jackson.databind
包。如果您按照this页面上的说明操作,那么您做错了。只需使用jackson-mapper模块即可。
以下是未来googlers的代码:
private static String getJsonSchema(Class clazz) throws IOException {
org.codehaus.jackson.map.ObjectMapper mapper = new ObjectMapper();
//There are other configuration options you can set. This is the one I needed.
mapper.configure(SerializationConfig.Feature.WRITE_ENUMS_USING_TO_STRING, true);
JsonSchema schema = mapper.generateJsonSchema(clazz);
return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(schema);
}
答案 1 :(得分:6)
Storme的答案参考org.codehaus
,这是杰克逊的旧版本。以下是类似的,但使用的是更快的xml(更新的版本)。
波姆:
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.7.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.7.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.7.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.module</groupId>
<artifactId>jackson-module-jsonSchema</artifactId>
<version>2.1.0</version>
</dependency>
代码:
import ...TargetClass;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.jsonschema.JsonSchema;
import java.io.IOException;
public final class JsonSchemaGenerator {
private JsonSchemaGenerator() { };
public static void main(String[] args) throws IOException {
System.out.println(JsonSchemaGenerator.getJsonSchema(TargetClass.class));
}
public static String getJsonSchema(Class clazz) throws IOException {
ObjectMapper mapper = new ObjectMapper();
mapper.configure(SerializationFeature.WRITE_ENUMS_USING_TO_STRING, true);
JsonSchema schema = mapper.generateJsonSchema(clazz);
return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(schema);
}
}
答案 2 :(得分:0)
如果有人来这里并希望在其代码中支持最新的草稿版本。
在此处查找您的首选语言: https://json-schema.org/implementations.html