【SpringBoot】中bean里大写的字段返回变成小写

例如我的bean中有以下4个字段

      private int Ret;
      private String Msg;
      private Object Data;
      private String Sig;

---

引入依赖

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.11.3</version>
</dependency>

---

在返回的json里只会显示：

  * 使用下面方法优化完美解决该问题。
  * 返回json会变成：[{"Ret":"xx","Msg":"xx","Data":"xx","Sig":"Sig"}](www.baidu.com)，完美解决问题！
  * 大小会变成小写，特殊符号开头的字段都不会显示，其原因是因为springboot在进行序列化和反序列时对字段进行了处理。

---

解决方案是：import com.fasterxml.jackson.annotation.JsonProperty;

  * 在get方法上加上该注解@JsonIgnore
  * 在字段上加上该注解@JsonProperty

package com.hlht.evcs.bean;
 
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
 
/**
 * 查询数据库返回
 */
public class HlhtRespDB {
    @JsonProperty(value = "Ret")
    private int Ret;
    @JsonProperty(value = "Msg")
    private String Msg;
    @JsonProperty(value = "Data")
    private Object Data;
    @JsonProperty(value = "Sig")
    private String Sig;
 
    public HlhtRespDB() {
    }
 
    public HlhtRespDB(int Ret, String Msg, Object Data, String Sig) {
        this.Ret = Ret;
        this.Msg = Msg;
        this.Data = Data;
        this.Sig = Sig;
    }
 
    @JsonIgnore
    public int getRet() {
        return Ret;
    }
 
    public void setRet(int ret) {
        Ret = ret;
    }
 
    @JsonIgnore
    public String getMsg() {
        return Msg;
    }
 
    public void setMsg(String msg) {
        Msg = msg;
    }
 
    @JsonIgnore
    public Object getData() {
        return Data;
    }
 
    public void setData(Object data) {
        Data = data;
    }
 
    @JsonIgnore
    public String getSig() {
        return Sig;
    }
 
    public void setSig(String sig) {
        Sig = sig;
    }
}