一：背景

為啥會(huì)有這篇文章了,其實(shí)也是湊巧,因?yàn)樽罱恿艘粋€(gè)特別蛋疼的需求,那就是本來之前的訂單業(yè)務(wù)線只查詢舊版的接口的，但是現(xiàn)在這個(gè)系統(tǒng)換了,但是訂單數(shù)據(jù)沒有做同步,那么現(xiàn)在訂單接口就有兩個(gè)了，一個(gè)新的一個(gè)舊的，我那個(gè)無語的,所以了在按照日期查詢數(shù)據(jù)的時(shí)候需要排序,那么涉及到類的排序我們就需要按照規(guī)則進(jìn)行需要實(shí)現(xiàn)Comparable接口

二：實(shí)現(xiàn)

所以具體如下

package com.mouse.order.model;
import com.mouse.moon.util.StringUtil;

public class OrderInfo implements Comparable{
    private String id;
    private String orderCd;//訂單號(hào)
    private String productType;//產(chǎn)品類型 酒店，機(jī)票
    private String productName;//產(chǎn)品名稱 深圳-北京
    private String beginDate;//開始時(shí)間
    private String endDate;//結(jié)束時(shí)
    private String amount;//數(shù)量
    private String orderPrice;//訂單金額
    private String status;//訂單狀態(tài)
    private String paymentStatus;//支付狀態(tài)
    private String channelName;//渠道名稱
    private String createDate;//創(chuàng)建時(shí)間

    private String payState;
    
    private String orderStatus;
    
    private String orderStatusName;

    public String getProductType() {
        return productType;
    }

    public void setProductType(String productType) {
        this.productType = productType;
    }

    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        this.productName = productName;
    }

    public String getBeginDate() {
        return beginDate;
    }

    public void setBeginDate(String beginDate) {
        this.beginDate = beginDate;
    }

    public String getEndDate() {
        return endDate;
    }

    public void setEndDate(String endDate) {
        this.endDate = endDate;
    }

    public String getAmount() {
        return amount;
    }

    public void setAmount(String amount) {
        this.amount = amount;
    }

    public String getOrderPrice() {
        return orderPrice;
    }

    public void setOrderPrice(String orderPrice) {
        this.orderPrice = orderPrice;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public String getPaymentStatus() {
        return paymentStatus;
    }

    public void setPaymentStatus(String paymentStatus) {
        this.paymentStatus = paymentStatus;
    }

    public String getChannelName() {
        return channelName;
    }

    public void setChannelName(String channelName) {
        this.channelName = channelName;
    }

    public String getCreateDate() {
        return createDate;
    }

    public void setCreateDate(String createDate) {
        this.createDate = createDate;
    }

    public String getOrderCd() {
        return orderCd;
    }

    public void setOrderCd(String orderCd) {
        this.orderCd = orderCd;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
    
    public String getPayState() {
        return payState;
    }

    public void setPayState(String payState) {
        this.payState = payState;
    }

    public String getOrderStatus() {
        return orderStatus;
    }

    public void setOrderStatus(String orderStatus) {
        this.orderStatus = orderStatus;
    }

    public String getOrderStatusName() {
        return orderStatusName;
    }

    public void setOrderStatusName(String orderStatusName) {
        this.orderStatusName = orderStatusName;
    }

    public int compareTo(Object o) {
        OrderInfo order = (OrderInfo)o;
        if(null == this.getCreateDate() || null == order.getCreateDate())
        {
            return 0;
        }
        long tTime = StringUtil.str2Long(this.getCreateDate().replaceAll(":", "").replaceAll(" ","").replaceAll("-",""));
        long oTime = StringUtil.str2Long(order.getCreateDate().replaceAll(":", "").replaceAll(" ","").replaceAll("-",""));
        if (tTime > oTime) {
            return -1;
        } else if (tTime < oTime) {
            return 1;
        } else {
            return 0;
        }
    }
}

所以對(duì)實(shí)現(xiàn)Comparable接口的在compareTo方法中進(jìn)行需要的判斷,這里我按照創(chuàng)建時(shí)間進(jìn)行比較。

具體使用出為Collections.sort(orderInfoList);在這里面會(huì)按照類的實(shí)現(xiàn)比較方式進(jìn)行排序操作。

// 按時(shí)間排序
Collections.sort(orderInfoList);

排完序后就需要進(jìn)行截取操作

 orderInfoList.subList(0, pageSize) ;

三：比較Comparator
自然順序就是那種String,Integer這種，它們都實(shí)現(xiàn)了Comparable，而Comparator本身就用了策略設(shè)計(jì)模式，可以根據(jù)自己定義的排序規(guī)則進(jìn)行比較排序，想升序，降序都可以。

四：浩語

                                           __                                                        
                            __  _  ____ __|  |__ _____    ___
                            \ \/ \/ /  |  \  |  \\__  \  /  _ \   
                             \     /|  |  /   Y  \/ __ \(  <_> )
                              \/\_/ |____/|___|  (____  /\____/ 
                                                    \/     \/          
                                 任何事情都是要靠努力和用心。