电商项目之响应编码的枚举类 和 通用的响应对象 和 常量类

/**
 * x响应编码的枚举类
 */
public enum ResponseCode {

    SUCCESS(0,"SUCCESS"),
    ERROR(1,"ERROR"),
    ILLEGAL_AGRUMENT(2,"ILLEGAL_AGRUMENT"),
    NEED_LOGIN(10,"NEED_LOGIN");

    private final int code;
    private final String desc;

    ResponseCode(int code,String desc){
        this.code=code;
        this.desc=desc;
    }

    public int getCode(){
        return code;
    }

    public String getDesc(){
        return  desc;
    }
}

package com.lpy.mall.common;
import org.codehaus.jackson.annotate.JsonIgnore;
import org.codehaus.jackson.map.annotate.JsonSerialize;
import java.io.Serializable;
/**
 * t通用的数据端响应对象
 */
@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)//保证序列化json的时候，如果是null的对象，key也会消失
public class ServerResponse<T> implements Serializable {

    private  int status;
    private String msg;
    private T data;

    //这几个不同的私有构造器，让封装的public方法调用起来比较优雅，也比较简明，还比较通用
    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.msg=msg;
        this.data=data;
    }
    //这方法是不是成功的响应
    @JsonIgnore //使之不在json序列化结果当中
    public boolean isSuccess(){
        return this.status == ResponseCode.SUCCESS.getCode();//为0表示成功
    }

    public int getStatus(){
        return status;
    }
    public T getData(){
        return data;
    }
    public String getMsg(){
        return msg;
    }
    //成功
    //调用返回一个status,第一个T表示将静态的这个方法定义成泛型方法
    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);
    }

    //失败
    public static <T> ServerResponse<T> createByError(){
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(),ResponseCode.ERROR.getDesc());
    }
    public static <T> ServerResponse<T> createByErrorMessage(String errorMessage){
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(),errorMessage);
    }
    public static <T> ServerResponse<T> createByErrorCodeMessage(int errorCode,String errorMessage){
        return new ServerResponse<T>(errorCode,errorMessage);
    }


}

package com.lpy.mall.common;

public class Const {

    public static final String CURRENT_USER="currentUser";

}