Java Executor framework uses

　　Java Executor framework is launched after Jdk1.5, for a more convenient framework for developing multi-threaded applications and packaged;

　　Compared to traditional Thread class, Java Executor easy to use, better performance, easier to manage, and support the thread pool, so we developed when the reptiles, in order to improve the efficiency of crawling reptiles, we want to use multiple threads, it is recommended to use Java the Executor framework to achieve, because Executor framework is both simple and efficient;

Java Executor framework used in reptile applications

　　Common Interface:

　　Create a fixed number of threads in the thread pool.

　　public static ExecutorService newFixedThreadPool(int nThreads) 

 　　

　　Execute a thread

　　void java.util.concurrent.Executor.execute(Runnable command)

 

　　View the number of active threads

　　int java.util.concurrent.ThreadPoolExecutor.getActiveCount()

 

　　End all threads

　　void java.util.concurrent.ExecutorService.shutdown()

　　Description: Executor in the management of multiple threads when processing will be carried out effective arrangements, such as when created, the thread pool is 10, if the actual thread over 10, Executor will effectively blocking queue and scheduling. For us this is transparent to the developer, has absolutely no specific implementation within it;

　　Test Case

　　

 1 import java.util.concurrent.ExecutorService;
 2 import java.util.concurrent.Executors;
 3 import java.util.concurrent.ThreadPoolExecutor;
 4 import java.util.concurrent.atomic.AtomicInteger;
 5 
 6 /**
 7  * @author zsh
 8  * @site www.qqzsh.top
 9  * @company wlgzs
10  * @create 2019-06-02 10:57
11  * @description
12  */
13 public class ExecutorTest {
14 
15     // 执行标识
16     Private  static  Boolean exeFlag = to true ;
 . 17  
18 is      public  static  void main (String [] args) throws InterruptedException {
 . 19          // Create ExecutorService fixed connection pool 10 created initial thread 
20 is          ExecutorService ExecutorService = Executors.newFixedThreadPool (2 );
 21 is          of AtomicInteger AtomicInteger = new new of AtomicInteger ();
 22 is  
23 is          the while (exeFlag) {
 24              IF (atomicInteger.get () <= 100 ) {
 25                  executorService.execute ( new new Runnable() {
26                     @Override
27                     public void run() {
28                         System.out.println("爬取了第"+atomicInteger.get()+"网页...");
29                         atomicInteger.getAndIncrement();
30                     }
31                 });
32             }else {
33                 if (((ThreadPoolExecutor)executorService).getActiveCount() == 0){
34                     executorService.shutdown();
35                     exeFlag=false;
36                     System.out.println ( "reptiles task has been completed" );
 37 [                  }
 38 is              }
 39  
40             the Thread.sleep (( Long ) 0.1 );
 41 is          }
 42 is      }
 43 is }