如何使用Jackson在Java中為欄位定義替代名稱？

@JsonAlias註解可以為反序列化過程中接受的屬性定義一個或多個備用名稱，設定JSON資料到一個Java對象。但當序列化時，即從 Java 物件取得 JSON，僅使用實際的邏輯屬性名稱，而不是 alias。

Syntax

<strong>@Target(value={ANNOTATION_TYPE,FIELD,METHOD,PARAMETER})
@Retention(value=RUNTIME)
public @interface JsonAlias</strong>

Example

的中文翻譯為：

範例

import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import java.io.*;
public class ObjectToJsonTest {
   public static void main(String[] args) throws JsonProcessingException {
      <strong>ObjectMapper </strong>mapper = new <strong>ObjectMapper()</strong>;
      Technology tech = new Technology("Java", "Oracle");
      Employee emp = new Employee(110, "Raja", tech);
      String jsonWriter = mapper.<strong>writerWithDefaultPrettyPrinter().writeValueAsString(emp);</strong>
      System.out.println(jsonWriter);
   }
}
<strong>// Technology class
</strong>class Technology {
<strong>   @JsonProperty("skill")
</strong>   private String skill;
<strong>   @JsonProperty("subSkill")
</strong><strong>   @JsonAlias({"sSkill", "mySubSkill"})
</strong>   private String subSkill;
   public Technology(){}
   public Technology(String skill, String subSkill) {
      this.skill = skill;
      this.subSkill = subSkill;
   }
   public String getSkill() {
      return skill;
   }
   public void setSkill(String skill) {
      this.skill = skill;
   }
   public String getSubSkill() {
      return subSkill;
   }
   public void setSubSkill(String subSkill) {
      this.subSkill = subSkill;
   }
}
<strong>// Employee class
</strong>class Employee {
<strong>   @JsonProperty("empId")
</strong>   private Integer id;
<strong>   @JsonProperty("empName")
</strong><strong>   @JsonAlias({"ename", "myename"})
</strong>   private String name;
<strong>   @JsonProperty("empTechnology")
</strong>   private Technology tech;
   public Employee(){}
   public Employee(Integer id, String name, Technology tech){
      this.id = id;
      this.name = name;
      this.tech = tech;
   }
   public Integer getId() {
      return id;
   }
   public void setId(Integer id) {
      this.id = id;
   }
   public String getName() {
      return name;
   }
   public void setName(String name) {
      this.name = name;
   }
   public Technology getTechnology() {
      return tech;
   }
   public void setTechnology(Technology tech) {
      this.tech = tech;
   }
}

輸出

<strong>{
 "technology" : {
 "skill" : "Java",
 "subSkill" : "Oracle"
 },
 "empId" : 110,
 "empName" : "Raja",
 "empTechnology" : {
 "skill" : "Java",
 "subSkill" : "Oracle"
 }
}</strong>

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