support jackson annotation JsonTypeInfo on interface, for issue #2548

core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterBaseModule.java

@@ -12,6 +12,7 @@
 import com.alibaba.fastjson2.util.*;
 
 import java.io.File;
+import java.io.Serializable;
 import java.lang.annotation.Annotation;
 import java.lang.reflect.*;
 import java.math.BigDecimal;
@@ -57,16 +58,24 @@ public void getBeanInfo(BeanInfo beanInfo, Class objectClass) {
  Class superclass = objectClass.getSuperclass();
  if (superclass != Object.class && superclass != null && superclass != Enum.class) {
  getBeanInfo(beanInfo, superclass);
+ }
+
+ Class[] interfaces = objectClass.getInterfaces();
+ for (Class item : interfaces) {
+ if (item == Serializable.class) {
+ continue;
+ }
+ getBeanInfo(beanInfo, item);
+ }
 
- if (beanInfo.seeAlso != null && beanInfo.seeAlsoNames != null) {
- for (int i = 0; i < beanInfo.seeAlso.length; i++) {
- Class seeAlso = beanInfo.seeAlso[i];
- if (seeAlso == objectClass && i < beanInfo.seeAlsoNames.length) {
- String seeAlsoName = beanInfo.seeAlsoNames[i];
- if (seeAlsoName != null && seeAlsoName.length() != 0) {
- beanInfo.typeName = seeAlsoName;
- break;
- }
+ if (beanInfo.seeAlso != null && beanInfo.seeAlsoNames != null) {
+ for (int i = 0; i < beanInfo.seeAlso.length; i++) {
+ Class seeAlso = beanInfo.seeAlso[i];
+ if (seeAlso == objectClass && i < beanInfo.seeAlsoNames.length) {
+ String seeAlsoName = beanInfo.seeAlsoNames[i];
+ if (seeAlsoName != null && seeAlsoName.length() != 0) {
+ beanInfo.typeName = seeAlsoName;
+ break;
  }
  }
  }

core/src/test/java/com/alibaba/fastjson2/issues_2500/Issue2548A.java

@@ -0,0 +1,249 @@
+package com.alibaba.fastjson2.issues_2500;
+
+import com.alibaba.fastjson2.JSON;
+import com.alibaba.fastjson2.JSONWriter;
+import com.fasterxml.jackson.annotation.*;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+
+import java.io.Serializable;
+import java.math.BigDecimal;
+import java.util.Objects;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class Issue2548A {
+ @Test
+ public void fastJson() {
+ StoreDTO storeDTO = new StoreDTO();
+ BananaDTO banana = new BananaDTO();
+ banana.setCount(BigDecimal.valueOf(10));
+ storeDTO.setItem(banana);
+
+ String jsonString = JSON.toJSONString(storeDTO, JSONWriter.Feature.WriteNulls);
+ assertEquals("{\"item\":{\"kind\":\"banana\",\"count\":10},\"storeId\":null}", jsonString);
+
+ StoreDTO store = JSON.parseObject(jsonString, StoreDTO.class);
+
+ assertEquals("banana", store.getItem().getKind());
+ }
+
+ @Test
+ public void jackson() throws Exception {
+ //given
+ ObjectMapper objectMapper = new ObjectMapper();
+
+ StoreDTO storeDTO = new StoreDTO();
+ BananaDTO banana = new BananaDTO();
+ banana.setCount(BigDecimal.valueOf(10));
+ storeDTO.setItem(banana);
+
+ //when
+ String jsonString = objectMapper.writeValueAsString(storeDTO);
+ StoreDTO store = objectMapper.readValue(jsonString, StoreDTO.class);
+
+ //then
+ assertEquals("banana", store.getItem().getKind());
+ }
+
+ @JsonTypeName("store")
+ public static class StoreDTO
+ implements Serializable {
+ private static final long serialVersionUID = 1L;
+
+ private String storeId;
+
+ private FruitDTO item;
+
+ public StoreDTO storeId(String storeId) {
+ this.storeId = storeId;
+ return this;
+ }
+
+ /**
+ * The unique ID of the fruit
+ * @return storeId
+ */
+
+ @JsonProperty("storeId")
+ public String getStoreId() {
+ return storeId;
+ }
+
+ public void setStoreId(String storeId) {
+ this.storeId = storeId;
+ }
+
+ public StoreDTO item(FruitDTO item) {
+ this.item = item;
+ return this;
+ }
+
+ /**
+ * Get item
+ * @return item
+ */
+ @JsonProperty("item")
+ public FruitDTO getItem() {
+ return item;
+ }
+
+ public void setItem(FruitDTO item) {
+ this.item = item;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) {
+ return true;
+ }
+ if (o == null || getClass() != o.getClass()) {
+ return false;
+ }
+ StoreDTO store = (StoreDTO) o;
+ return Objects.equals(this.storeId, store.storeId) &&
+ Objects.equals(this.item, store.item);
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(storeId, item);
+ }
+
+ @Override
+ public String toString() {
+ StringBuilder sb = new StringBuilder();
+ sb.append("class StoreDTO {\n");
+ sb.append(" storeId: ").append(toIndentedString(storeId)).append("\n");
+ sb.append(" item: ").append(toIndentedString(item)).append("\n");
+ sb.append("}");
+ return sb.toString();
+ }
+
+ /**
+ * Convert the given object to string with each line indented by 4 spaces
+ * (except the first line).
+ */
+ private String toIndentedString(Object o) {
+ if (o == null) {
+ return "null";
+ }
+ return o.toString().replace("\n", "\n ");
+ }
+ }
+
+ @JsonIgnoreProperties(
+ value = "kind", // ignore manually set kind, it will be automatically generated by Jackson during serialization
+ allowSetters = true // allows the kind to be set during deserialization
+ )
+ @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "kind", visible = true)
+ @JsonSubTypes({
+ @JsonSubTypes.Type(value = AppleDTO.class, name = "apple"),
+ @JsonSubTypes.Type(value = BananaDTO.class, name = "banana")
+ })
+ public interface FruitDTO
+ extends Serializable {
+ public String getKind();
+ }
+
+ @JsonTypeName("banana")
+ public static class BananaDTO
+ implements Serializable, FruitDTO {
+ private static final long serialVersionUID = 1L;
+
+ private String kind;
+
+ private BigDecimal count;
+
+ public BananaDTO kind(String kind) {
+ this.kind = kind;
+ return this;
+ }
+
+ /**
+ * Get kind
+ * @return kind
+ */
+
+ @JsonProperty("kind")
+ public String getKind() {
+ return kind;
+ }
+
+ public void setKind(String kind) {
+ this.kind = kind;
+ }
+
+ public BananaDTO count(BigDecimal count) {
+ this.count = count;
+ return this;
+ }
+
+ /**
+ * Get count
+ * @return count
+ */
+ @JsonProperty("count")
+ public BigDecimal getCount() {
+ return count;
+ }
+
+ public void setCount(BigDecimal count) {
+ this.count = count;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) {
+ return true;
+ }
+ if (o == null || getClass() != o.getClass()) {
+ return false;
+ }
+ BananaDTO banana = (BananaDTO) o;
+ return Objects.equals(this.kind, banana.kind) &&
+ Objects.equals(this.count, banana.count);
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(kind, count);
+ }
+
+ @Override
+ public String toString() {
+ StringBuilder sb = new StringBuilder();
+ sb.append("class BananaDTO {\n");
+ sb.append(" kind: ").append(toIndentedString(kind)).append("\n");
+ sb.append(" count: ").append(toIndentedString(count)).append("\n");
+ sb.append("}");
+ return sb.toString();
+ }
+
+ /**
+ * Convert the given object to string with each line indented by 4 spaces
+ * (except the first line).
+ */
+ private String toIndentedString(Object o) {
+ if (o == null) {
+ return "null";
+ }
+ return o.toString().replace("\n", "\n ");
+ }
+ }
+
+ @JsonTypeName("apple")
+ public static class AppleDTO
+ implements Serializable, FruitDTO {
+ private String kind;
+
+ @Override
+ public String getKind() {
+ return kind;
+ }
+
+ public void setKind(String kind) {
+ this.kind = kind;
+ }
+ }
+}