多线程批量调用接口

首先定义一个类，该类封装批量请求参数

public class Result {
    private Integer id;
    private String requestParam;
    private Date date;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getRequestParam() {
        return requestParam;
    }

    public void setRequestParam(String requestParam) {
        this.requestParam = requestParam;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }
}

接下来模拟批量调用其他服务接口：

import com.google.common.collect.Lists;
import org.apache.commons.collections.CollectionUtils;

import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

public class ManyThreadCallTest {

    private static final int dataSize = 50;

    public static void main(String[] args){

        // 模拟从数据库查询数据
        List params = queryFromDB();
        // 2,模拟多线程批量调用接口
       ManyThreadCall(params);
    }

    // 模拟从数据库查询请求入参记录
    private static List queryFromDB() {
        List resultLists = Lists.newArrayList();
        for (int i = 0; i < dataSize; i++) {
            Result resultDto = new Result();
            resultDto.setRequestParam("WJ00000" + i);
            resultLists.add(resultDto);
        }
        return resultLists;
    }

    private static void ManyThreadCall(List params) {
        Long startTime= System.currentTimeMillis();
        List resultLists = Lists.newArrayList();
        // params集合拆分，List>里面每个List包含3条记录，这里也可以根据业务情况做调整，调整为4或者5都可以。
        List> partList = Lists.partition(params,3);
        for(List requestParms:partList){
            List resultData = getResultData(requestParms);
            if(CollectionUtils.isNotEmpty(resultData)){
                resultLists.addAll(resultData);
            }
        }
        System.out.println("ManyThreadCall 花费时间："+(System.currentTimeMillis()-startTime));
    }

// CompletableFuture多线程调用并返回值
    public static List getResultData(List params) {

        List> completableFutureList = Lists.newArrayList();
        params.stream().forEach(param -> {
            try {
                CompletableFuture future = CompletableFuture.supplyAsync(() -> callRemoteInterface(param));
                completableFutureList.add(future);
            } catch (Exception e) {
                System.out.println("callRemoteInterface fail,requestParam:"+param.getRequestParam());
            }
        });
        List results = completableFutureList.stream().map(CompletableFuture::join).collect(Collectors.toList());
        return results;
    }

    // 伪代码模拟调用外部接口
    private static Result callRemoteInterface(Result resultDto) {
        try {
            // 这里假设调接口花费2秒
            TimeUnit.SECONDS.sleep(2L);//call壹次花費2秒鐘
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return resultDto;
    }

}