Java多线程并发执行demo代码实例

 package java8test; import java.util.ArrayList; import java.util.List; import java.util.concurrent.BlockingQueue; import java.util.concurrent.Callable; import java.util.concurrent.CountDownLatch; import java.util.concurrent.ExecutionException; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.Future; import java.util.concurrent.LinkedBlockingQueue; /** * @param  为被处理的数据类型 * @param 返回数据类型 * 知识点1：X,T为泛型，为什么要用泛型，泛型和Object的区别请看：https://www.cnblogs.com/xiaoxiong2015/p/12705815.html */ public abstract class MultiThread { public static int i = 0; // 知识点2：线程池:https://www.cnblogs.com/xiaoxiong2015/p/12706153.html private final ExecutorService exec; // 线程池 // 知识点3：@author Doung Lea 队列：https://www.cnblogs.com/xiaoxiong2015/p/12825636.html private final BlockingQueue> queue = new LinkedBlockingQueue<>(); // 知识点4：计数器，还是并发包大神 @author Doug Lea 编写。是一个原子安全的计数器，可以利用它实现发令枪 private final CountDownLatch startLock = new CountDownLatch(1); // 启动门，当所有线程就绪时调用countDown private final CountDownLatch endLock; // 结束门 private final List listData;// 被处理的数据 /** * @param list list.size()为多少个线程处理，list里面的H为被处理的数据 */ public MultiThread(List list) { if (list != null && list.size() > 0) { this.listData = list; exec = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors()); // 创建线程池，线程池共有nThread个线程 endLock = new CountDownLatch(list.size()); // 设置结束门计数器，当一个线程结束时调用countDown } else { listData = null; exec = null; endLock = null; } } /** * * @return 获取每个线程处理结速的数组 * @throws InterruptedException * @throws ExecutionException */ public List getResult() throws InterruptedException, ExecutionException { List resultList = new ArrayList<>(); if (listData != null && listData.size() > 0) { int nThread = listData.size(); // 线程数量 for (int i = 0; i  future = exec.submit(new Task(i, data) { @Override public T execute(int currentThread, X data) { return outExecute(currentThread, data); } }); // 将任务提交到线程池 queue.add(future); // 将Future实例添加至队列 } startLock.countDown(); // 所有任务添加完毕，启动门计数器减1，这时计数器为0，所有添加的任务开始执行 endLock.await(); // 主线程阻塞，直到所有线程执行完成 for (Future future : queue) { resultList.add(future.get()); } exec.shutdown(); // 关闭线程池 } return resultList; } /** * 每一个线程执行的功能，需要调用者来实现 * @param currentThread 线程号 * @param data 每个线程被处理的数据 * @return T返回对象 */ public abstract T outExecute(int currentThread, X data); /** * 线程类 */ private abstract class Task implements Callable { private int currentThread;// 当前线程号 private X data; public Task(int currentThread, X data) { this.currentThread = currentThread; this.data = data; } @Override public T call() throws Exception { // startLock.await(); // 线程启动后调用await，当前线程阻塞，只有启动门计数器为0时当前线程才会往下执行 T t = null; try { t = execute(currentThread, data); } finally { endLock.countDown(); // 线程执行完毕，结束门计数器减1 } return t; } /** * 每一个线程执行的功能 * @param currentThread 线程号 * @param data 每个线程被处理的数据 * @return T返回对象 */ public abstract T execute(int currentThread, X data); } }

 package java8test; public class ResultVo { int i; public ResultVo(int i) { this.i = i; } public ResultVo() { // TODO Auto-generated constructor stub } }

 package java8test; public class ParamVo { private int i; ParamVo(int i) { this.i = i; } public int getI() { return i; } @Override public String toString() { return String.valueOf(i) + " " + hashCode(); } }

 package java8test; import java.util.ArrayList; import java.util.List; public class Test { public static void main(String[] args) { try { List splitList = new ArrayList(); for (int i = 0; i <100; i++) { splitList.add(new ParamVo(i)); } List splitList1 = new ArrayList(); for (int i = 200; i <300; i++) { splitList1.add(new ParamVo(i)); } MultiThread multiThread = new MultiThread(splitList) { @Override public ResultVo outExecute(int currentThread, ParamVo data) { System.out.println("当前线程名称：" + Thread.currentThread().getName() + "当前线程号=" + currentThread + " data=" + data); i--; return new ResultVo(data.getI()); } }; MultiThread multiThread1 = new MultiThread(splitList1) { @Override public ResultVo outExecute(int currentThread, ParamVo data) { System.out.println("当前线程名称：" + Thread.currentThread().getName() + "当前线程号=" + currentThread + " data=" + data); i--; return new ResultVo(data.getI()); } }; List list = multiThread.getResult(); List list1 = multiThread1.getResult(); // 获取每一批次处理结果 System.out.println("获取处理结果........................"); for (ResultVo vo : list) { System.out.println(vo.i); } System.out.println("获取1处理结果........................"); for (ResultVo vo : list1) { System.out.println(vo.i); } } catch (Exception e) { e.printStackTrace(); } } }