通用泛型对象模块：利用通用泛型的特点，封装一个快递包对象，用于向前台以固定的模式发送数据!与前端约定稳定的模式有利于模块化开发!

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@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)//途中被开放的三个变量是默认一定返回，有时会出现返回data的空节点,因此需要处理
public class ServerResponse<T> implements Serializable {
      //必须维护以上组件注解，为了防止前端传回空而失效的冗余对象，而导致后端报错
    private int status;
    private String msg;
    private T data;


    private ServerResponse(int status){
        this.status=status;
    }

    private ServerResponse(int status,String msg){
        this.status=status;
        this.msg=msg;
    }

    private ServerResponse(int status,T data){
        this.status=status;
        this.data=data;
    }

    private ServerResponse(int status,String msg,T data){
        this.status=status;
        this.data=data;
        this.msg=msg;
    }
    //判断是否成功：此处使用枚举将合法常量(携带特殊意义)的字符进行声明
    @JsonIgnore
    //使之不在json序列化之中
    public boolean isSuccess(){
        return this.status==ResponseCode.SUCCESS.getCode();
    }

    public int getStatus(){
        return status;
    }
    public String getMsg(){
        return msg;
    }

    public T getData(){
        return data;
    }

    public static <T> ServerResponse<T> createBySuccess(){
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode());
    }

    public static <T> ServerResponse<T> createBySuccessMessage(String msg){
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),msg);
    }

    public static <T> ServerResponse<T> createBySuccess(T data){
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),data);
    }

    public static <T> ServerResponse<T> createBySuccess(String msg,T data){
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),msg,data);
    }

    public static <T> ServerResponse<T> createByError(){
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(),ResponseCode.ERROR.getDesc());
    }

    public static <T> ServerResponse<T> createByErrorMessage(String msg){
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(),msg);
    }

    public static <T> ServerResponse<T> createByErrorCodeMessage(int eerrorcode,String errormsg){
        return new ServerResponse<T>(eerrorcode,errormsg);
    }


}