大集合分批处理

1：使用stream流分批处理

package com.demo.ddd;

import com.google.common.collect.Lists;
import org.apache.commons.collections4.ListUtils;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class ObjTest {
    public static void main(String[] args) {
        
        List<Integer> list = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
        //批次数量
        int splitSize = 3;

        //1：使用stream流分批处理
        List<List<Integer>> lists = handleForStream(list, splitSize);
        System.out.println("stream实现：" + lists);

    }

    private static List<List<Integer>> handleForStream(List<Integer> list, int splitSize) {
        //获取分隔次数
        int limit = (list.size() + splitSize - 1) / splitSize;
        List<List<Integer>> tmpList = new ArrayList<>();
        Stream.iterate(0, n -> n + 1).limit(limit).forEach(i -> {
            tmpList.add(list.stream().skip(i * splitSize).limit(splitSize).collect(Collectors.toList()));
        });
        return tmpList;
    }
}

2：使用工具类-apache

导入依赖

<dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-collections4</artifactId>
            <version>4.2</version>
        </dependency>

代码实现

package com.demo.ddd;

import org.apache.commons.collections4.ListUtils;

import java.util.Arrays;
import java.util.List;

public class ObjTest {
    public static void main(String[] args) {

        List<Integer> list = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
        //批次数量
        int splitSize = 3;

        //使用工具类实现-apache
        List<List<Integer>> partition = ListUtils.partition(list, splitSize);
        System.out.println("apache实现：" + partition);

    }
}

3：使用工具类-guava

导入依赖

        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>15.0</version>
        </dependency>

代码实现

package com.demo.ddd;

import com.google.common.collect.Lists;

import java.util.Arrays;
import java.util.List;

public class ObjTest {
    public static void main(String[] args) {

        List<Integer> list = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
        //批次数量
        int splitSize = 3;

        //使用工具类-guava
        List<List<Integer>> partition1 = Lists.partition(list, splitSize);
        System.out.println("guava实现：" + partition1);

    }
}

 

全部统一执行后打印结果如下：