【SpringBoot】中bean里大寫的字段返回變成小寫

例如我的bean中有以下4個字段

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

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引入依賴

<!-- 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里只會顯示：{"ret":"xx","msg":"xx","data":"xx","sig":"xx"}

  * 使用下面方法優化完美解決該問題。
  * 返回json會變成：[{"Ret":"xx","Msg":"xx","Data":"xx","Sig":"Sig"}](www.baidu.com)，完美解決問題！
  * 大小會變成小寫，特殊符號開頭的字段都不會顯示，其原因是因為springboot在進行序列化和反序列時對字段進行了處理。

---

解決方案是：import com.fasterxml.jackson.annotation.JsonProperty;

  * 在get方法上加上該注解@JsonIgnore
  * 在字段上加上該注解@JsonProperty

package com.hlht.evcs.bean;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;

/**
 * 查詢數據庫返回
 */
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;
    }
}