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往线程池中动态添加任务示例

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import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class ThreadPoolDynamicTasks extends Thread {

private BlockingQueue bq = new LinkedBlockingQueue<>();// 可将此队列注入到客户端的子模块中
private ExecutorService es = new ThreadPoolExecutor(2, 4, 0, TimeUnit.SECONDS, bq);

private void init() {
try {
bq.put(new Runnable() {

@Override
public void run() {
while (true) {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("添加的任务");
}
}
});
bq.put(new Runnable() {

@Override
public void run() {
// while (true) {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("AAAAAA");
// }
}
});
} catch (InterruptedException e) {
e.printStackTrace();
}
}

public static void main(String[] args) {
ThreadPoolDynamicTasks instance = new ThreadPoolDynamicTasks();
instance.init();// 阻塞队列中添加任务
instance.start();// 利用线程循环遍历阻塞队列,每执行一个任务就移除一个任务
instance.getTaskLengSize();// 获取阻塞队列里的任务数量
try {
Thread.sleep(3000);
instance.addTask();// 在main线程中中途添加阻塞队列
instance.getTaskLengSize();// 获取阻塞队列里的任务数量
Thread.sleep(1000);
instance.getTaskLengSize();// 获取阻塞队列的任务数量
} catch (InterruptedException e) {
e.printStackTrace();
}

}

@Override
public void run() {
while (true) {
for (Runnable runnable : bq) {
// try {
// bq.take();
// } catch (InterruptedException e) {
// e.printStackTrace();
// }
es.execute(runnable);
bq.remove(runnable);
}
}
}

private void addTask() {
try {
bq.put(new Runnable() {

@Override
public void run() {
while (true) {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("~~~~~~~~~~~");
}
}
});
// es.execute(command);
} catch (InterruptedException e) {
e.printStackTrace();
}
}

private void getTaskLengSize() {
System.out.println(bq.size());
}

}


  只要将任务队列注册到上下文容器中(例如web应用的servletContext、Eclipse应用的EclipseContext),注册到需要执行任务的java文件里,就可以用一个线程池执行所有的任务。



转载于:https://www.cnblogs.com/InformationGod/p/10537845.html






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