解决springboot bean中大写的字段返回变成小写的问题

private String code;
private String _TOKENUUMS;
private String TGC;
private String U;

{“code”:“xx”,“tgc”:“xx”,“u”:“xx”}

import com.fasterxml.jackson.annotation.JsonProperty;

private String code;
  private String _TOKENUUMS;
  private String TGC;
  private String U;
  public String getCode() {
    return code;
  }
  public void setCode(String code) {
    this.code = code;
  }
  @JsonProperty("_TOKENUUMS")
  public String get_TOKENUUMS() {
    return _TOKENUUMS;
  }
  public void set_TOKENUUMS(String _TOKENUUMS) {
    this._TOKENUUMS = _TOKENUUMS;
  }
  @JsonProperty("TGC")
  public String getTGC() {
    return TGC;
  }
  public void setTGC(String TGC) {
    this.TGC = TGC;
  }
  @JsonProperty("U")
  public String getU() {
    return U;
  }
  public void setU(String u) {
    U = u;
  }