根据对象中某字段判断两个List数据,哪些需要新增,删除,修改

可用于数据对接时,筛选出新旧数据中有差异的对象；此方法需要引入HUTOOL工具

		
		
			cn.hutool
			hutool-all
			5.7.16
		

package com.ambition.hislink.utils;

import cn.hutool.core.builder.EqualsBuilder;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.date.DateUtil;
import cn.hutool.core.date.StopWatch;
import cn.hutool.core.lang.Console;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.ReflectUtil;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;

import java.util.*;
import java.util.concurrent.TimeUnit;

@Slf4j
public class ListCompareUtils {
    
    public static  Map> getListCompare(List newData, List oldData, String[] notCompare, String[] only) {
        Map> map = new HashMap();
        List updateList = new ArrayList<>();
        for (int i = newData.size()-1; i >=0 ; i--) {
            for (int j = oldData.size()-1; j >=0 ; j--) {
                T t = newData.get(i);
                T t1 = oldData.get(j);
                if (judgeonly(only, t, t1)) {
                    if (!EqualsBuilder.reflectionEquals(t,t1,notCompare)) {
                        //当有修改时,加入updateList中,跳出旧oldData,继续遍历newData;
                        updateList.add(t);
                    }
                    newData.remove(i);
                    oldData.remove(j);
                    break;
                }
            }
        }
        log.info("insertList ->{},updateList ->{},deleteList->{}",newData.size(),updateList.size(),oldData.size());
        map.put("insertList", newData);
        map.put("updateList", updateList);
        map.put("deleteList", oldData);
        return map;
    }

    
    private static  boolean judgeonly(String[] only, T one, T two) {
        for (String onlyStr : only) {
            Object onlyValue = ReflectUtil.getFieldValue(one, onlyStr);
            Object onlyValue1 = ReflectUtil.getFieldValue(two, onlyStr);
            if ((!ObjectUtil.isBasicType(onlyValue) && !(onlyValue instanceof String)  )
                    || (!ObjectUtil.isBasicType(onlyValue1) && !(onlyValue1 instanceof String)  )
                    || !ObjectUtil.equal(onlyValue, onlyValue1)) {
                return false;
            }
        }
        return true;
    }

    public static void main(String[] args) {
        List value1 = new ArrayList<>();
        List value2 = new ArrayList<>();
        for (int i = 0; i < 20000; i++) {
            DemoPojo pdaExecutionDrug = new DemoPojo();
            pdaExecutionDrug.setBedno(i + "");
            pdaExecutionDrug.setPatname("zhangshan"+i);
            pdaExecutionDrug.setCureno("1234");
            value1.add(pdaExecutionDrug);
        }

        for (int i = 2; i < 25000; i++) {
            DemoPojo pdaExecutionDrug = new DemoPojo();
            pdaExecutionDrug.setBedno(i + "");
            pdaExecutionDrug.setPatname("zhangshan"+(i<15000?i : i+1));
            pdaExecutionDrug.setCureno( "123");
            value2.add(pdaExecutionDrug);
        }
        StopWatch stopWatch = DateUtil.createStopWatch();
        stopWatch.start("用反射");
        Map> listCompare = getListCompare(CollUtil.newArrayList(value1), CollUtil.newArrayList(value2), null, new String[]{"bedno"});
        stopWatch.stop();
        stopWatch.start("不用反射");
        List update = new ArrayList<>();
        for (int i = value1.size()-1; i >=0 ; i--) {
            for (int j = value2.size()-1; j >=0 ; j--) {
                DemoPojo t = value1.get(i);
                DemoPojo t1 = value2.get(j);
                if (t.getBedno().equals(t1.getBedno())) {
                    if (!EqualsBuilder.reflectionEquals(t,t1,"bedNo","cureno")){
                        update.add(t);
                    }
                    value1.remove(i);
                    value2.remove(j);
                    break;
                    }

                }
            }
        log.info("insertList ->{},updateList ->{},deleteList->{}",value1.size(),update.size(),value2.size());
        stopWatch.stop();
        Console.log(stopWatch.prettyPrint(TimeUnit.SECONDS));

    }

}
@Data
 class DemoPojo {
    private String bedno;
    private String patname;
    private String cureno;

 }

2022-03-10 15:04:55.458  INFO   --- [           main] c.a.hislink.utils.ListCompareUtils       : insertList ->2,updateList ->19998,deleteList->5000
2022-03-10 15:04:56.453  INFO   --- [           main] c.a.hislink.utils.ListCompareUtils       : insertList ->2,updateList ->5000,deleteList->5000
StopWatch '': running time = 12 s
---------------------------------------------
s         %     Task name
---------------------------------------------
000000011  92%   用反射
000000000  08%   不用反射