java并发请求多个接口,顺序返回

最近有个需求,从一个api拿数据,但是api时间参数又有范围限制,因此需要自己将时间分成多段,多次请求api,并且最终返回的数据需要保持原有的顺序

代码如下:

package com.test001.www.threadpool;

import java.util.LinkedList;
import java.util.List;
import java.util.Vector;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future; public class ThreadPoolTest { public static void main(String[] args){
ArrayThreadPool<User> pool = new ArrayThreadPool<>();
for (int i = 5; i > 0; i--){
Integer data = i;
pool.submit(()->{
         //这个地方可以写一个函数,参数可以从外层传入
System.out.println("网络操作开始"+data);
Thread.sleep(data*1000);
System.out.println("网络操作结束"+data);
return new User(data);
});
}
List<User> users = pool.get();
for (User u :users){
System.out.println(u);
}
pool.stop();
}
} class User{
private int i;
public User(int a){
i=a;
} @Override
public String toString() {
return "user="+i;
}
} class ArrayThreadPool<T>{
private Vector<Future<T>> futureList = new Vector<>();
ExecutorService executor = Executors.newCachedThreadPool();
public ArrayThreadPool submit(Callable<T> task){
Future<T> result = executor.submit(task);
futureList.add(result);
return this;
} public List<T> get(){
List<T> result = new LinkedList<>();
for (Future<T> future :
futureList) {
try {
result.add(future.get());
}catch (Exception e){
result.add(null);
} }
return result;
} public void stop(){
executor.shutdown();
}
}

使用java自带线程池实现

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