Java秒杀简单设计三：数据封装类

上一篇https://www.cnblogs.com/taiguyiba/p/9828984.html 整合了数据库表和Dao层代码

这一篇继续设计数据封装类：

涉及到获取秒杀地址，查询，返回秒杀结果等内容

1.数据封装：

1.1 秒杀地址封装类Exposer

创建Exposer类，用于封装秒杀地址：如果开启秒杀，则返回状态、秒杀地址md5加密值和ID，如果秒杀未开启，则返回开始时间、结束时间等。

Exposer.java

package com.seckill.dto;

public class Exposer {
    //是否开启秒杀
    private boolean exposed;
    //md5加密
    private String md5;
    //id
    private long seckillId;
    //now time
    private long now;
    //start time
    private long start;
    //end time
    private long end;
    public Exposer(boolean exposed, String md5,long seckillId) {
        super();
        this.exposed = exposed;
        this.md5 = md5;
        this.seckillId = seckillId;
    }
    public Exposer(boolean exposed, long now, long start, long end,long seckillId) {
        super();
        this.exposed = exposed;
        this.now = now;
        this.start = start;
        this.end = end;
        this.seckillId = seckillId;
    }
    public Exposer(boolean exposed, long seckillId) {
        super();
        this.exposed = exposed;
        this.seckillId = seckillId;
    }
    public boolean isExposed() {
        return exposed;
    }
    public void setExposed(boolean exposed) {
        this.exposed = exposed;
    }
    public String getMd5() {
        return md5;
    }
    public void setMd5(String md5) {
        this.md5 = md5;
    }
    public long getSeckillId() {
        return seckillId;
    }
    public void setSeckillId(long seckillId) {
        this.seckillId = seckillId;
    }
    public long getNow() {
        return now;
    }
    public void setNow(long now) {
        this.now = now;
    }
    public long getStart() {
        return start;
    }
    public void setStart(long start) {
        this.start = start;
    }
    public long getEnd() {
        return end;
    }
    public void setEnd(long end) {
        this.end = end;
    }
    @Override
    public String toString() {
        return "Exposer [exposed=" + exposed + ", md5=" + md5 + ", seckillId=" + seckillId + ", now=" + now + ", start="
                + start + ", end=" + end + "]";
    }
}

1.2 秒杀结果封装类 SeckillExecution

SeckillExecution主要用于封装秒杀结果

package com.seckill.dto;

import com.seckill.entity.SuccessKilled;
import com.seckill.enums.SeckillStateEnum;
/**
 * 数据传递
 * 其中并没有添加枚举类型，转换成json有问题
 * @author lll
 *
 */
public class SeckillExecution {

    private long seckillId;

    private int state;

    private String stateInfo;

    private SuccessKilled successKilled;

    public SeckillExecution(long seckillId,SeckillStateEnum seckillStateEnum, SuccessKilled successKilled) {
        super();
        this.seckillId = seckillId;
        this.state = seckillStateEnum.getState();
        this.stateInfo = seckillStateEnum.getStateInfo();
        this.successKilled = successKilled;
    }
    public SeckillExecution(long seckillId, SeckillStateEnum seckillStateEnum) {
        super();
        this.seckillId = seckillId;
        this.state = seckillStateEnum.getState();
        this.stateInfo = seckillStateEnum.getStateInfo();
    }
    public SeckillExecution(SeckillStateEnum seckillStateEnum) {
        super();
        this.state = seckillStateEnum.getState();
        this.stateInfo = seckillStateEnum.getStateInfo();
    }
    public long getSeckillId() {
        return seckillId;
    }
    public void setSeckillId(long seckillId) {
        this.seckillId = seckillId;
    }
    public int getState() {
        return state;
    }

    public void setState(int state) {
        this.state = state;
    }

    public String getStateInfo() {
        return stateInfo;
    }

    public void setStateInfo(String stateInfo) {
        this.stateInfo = stateInfo;
    }

    public SuccessKilled getSuccessKilled() {
        return successKilled;
    }

    public void setSuccessKilled(SuccessKilled successKilled) {
        this.successKilled = successKilled;
    }

    @Override
    public String toString() {
        return "SeckillExecution [seckillId=" + seckillId + ", state=" + state + ", stateInfo=" + stateInfo
                + ", successKilled=" + successKilled + "]";
    }

}

1.3 前端请求结果封装类 SeckillResult

SeckillResult<T> 用于封装前端请求的结果：

package com.seckill.dto;
/**
 * 所有ajax请求封装
 * @author mayn
 *
 */
public class SeckillResult<T> {

    private boolean success;

    private T data;

    private String error;

    public SeckillResult(boolean success, T data) {
        super();
        this.success = success;
        this.data = data;
    }

    public SeckillResult(boolean success, String error) {
        super();
        this.success = success;
        this.error = error;
    }

    public boolean isSuccess() {
        return success;
    }

    public void setSuccess(boolean success) {
        this.success = success;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    public String getError() {
        return error;
    }

    public void setError(String error) {
        this.error = error;
    }
}

1.4 常量数据字典 SeckillStateEnum

SeckillStateEnum用于封装数据字典：

package com.seckill.enums;
/**
 * 使用枚举标示常量数据字典
 * @author mayn
 *
 */
public enum SeckillStateEnum {
    SUCCESSD(,"秒杀成功"),
    END(,"秒杀结束"),
    REPEAT_KILL(-,"重复秒杀"),
    INNER_ERROR(-,"内部错误"),
    DATA_REWRITE(-,"数据篡改")
    ;
    private int state;

    private String stateInfo;

    private SeckillStateEnum(int state, String stateInfo) {
        this.state = state;
        this.stateInfo = stateInfo;
    }

    public int getState() {
        return state;
    }

    public String getStateInfo() {
        return stateInfo;
    }
    public static SeckillStateEnum stateOf(int index) {
        for(SeckillStateEnum state : values()) {
            if(state.getState() == index) {
                return state;
            }
        }
        return null;
    }
}

1.5 封装异常类

 RepeatKillException 重复秒杀异常类

package com.seckill.exception;

public class RepeatKillException extends RuntimeException {

    public RepeatKillException(String message, Throwable cause) {
        super(message, cause);
        // TODO Auto-generated constructor stub
    }

    public RepeatKillException(String message) {
        super(message);
        // TODO Auto-generated constructor stub
    }
}

SeckillCloseException 秒杀关闭异常类

package com.seckill.exception;

public class SeckillCloseException extends RuntimeException {

    public SeckillCloseException(String message, Throwable cause) {
        super(message, cause);
        // TODO Auto-generated constructor stub
    }

    public SeckillCloseException(String message) {
        super(message);
        // TODO Auto-generated constructor stub
    }

}

SeckillException 秒杀异常类

package com.seckill.exception;

public class SeckillException extends RuntimeException {

    public SeckillException(String message, Throwable cause) {
        super(message, cause);
        // TODO Auto-generated constructor stub
    }

    public SeckillException(String message) {
        super(message);
        // TODO Auto-generated constructor stub
    }

}