Java thread pool Send mail __java

To get a sense of how the Java thread pool is used, just to make a simple email notification middle function, write down this note. Laughed

Servlet Code Sendemailservlet.java:

Package servlet;
Import java.io.IOException;
Import Java.io.PrintWriter;
Import Java.util.concurrent.BlockingQueue;
Import Java.util.concurrent.LinkedBlockingDeque;
Import Java.util.concurrent.ThreadPoolExecutor;

Import Java.util.concurrent.TimeUnit;
Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;

Import Javax.servlet.http.HttpServletResponse; /** * Send mail servlet * @author Gandalf * * */public class Sendemailservlet extends httpservlet{private static final in t corepoolsize = 1;
	
	The number of core threads saved in the thread pool. private static final int maximumpoolsize = 4;
	
	The maximum number of threads that the thread pool allows to create. Private static final Long KeepAliveTime = 0;
	
	The time at which redundant threads are terminated when the total number of threads in the thread pool is greater than the number of core threads.
	
	Message Queuing (thread sharing) private static blockingqueue<runnable> Emailqueue = new linkedblockingdeque<runnable> (); Instantiate thread pool (thread sharing) private static Threadpoolexecutor threadpool= new Threadpoolexecutor (Corepoolsize, Maximumpoolsize, KeepAliveTime, Timeunit.seconDS, Emailqueue,new Threadpoolexecutor.abortpolicy ()); @Override protected void doget (HttpServletRequest req, HttpServletResponse resp) throws Servletexception, IOException
	{DoPost (req, resp); @Override protected void DoPost (HttpServletRequest req, HttpServletResponse resp) throws Servletexception, Ioexcep
		
		tion {//content to be sent String content = Req.getparameter ("msg");
		
		Prints the current active thread and queue size System.out.println ("--current thread pool size" + threadpool.getpoolsize () + "", Current queue Size "+emailqueue.size () +" ");
	
		Join Queue Threadpool.execute (new Sendthread (content));
		Returns the result printwriter out = Resp.getwriter ();
	Out.println ("over");
		@Override public void Destroy () {//Close thread pool Threadpool.shutdown ();
	Super.destroy ();
 }
	

}

To process the thread class Sendthread.java for sending messages:

Package servlet;

/**
 * Send mail thread
 * @author Gandalf
 * */public
class Sendthread implements runnable{
	
	private String content;
	
	Public Sendthread (String content) {
		this.content = content;
	}
	
	@Override public
	Void Run () {
		
		try {
			//Send Message ....
			
			
			Thread.Sleep (1000);
			System.out.println ("SendMail:" +content);
		} catch (Interruptedexception e) {
			e.printstacktrace ();}}}

Web.xml configuration:

<servlet>
      <servlet-name>sendMsg</servlet-name>
      <servlet-class>servlet. sendemailservlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
      <servlet-name >sendMsg</servlet-name>
      <url-pattern>/sendMsg.do</url-pattern>
  </ Servlet-mapping>

Test class to send a request to the 127.0.0.1/projectname/sendmsg.do by get way:

Package test;
Import Java.io.BufferedReader;
Import Java.io.InputStreamReader;
Import java.net.HttpURLConnection;

Import Java.net.URL; public class ThreadPoolTest1 {public static void main (string[] args) {for (int i=0; i<) {New i++ (i
			+ "-t1"). Run ();
			New Mythread (i+ "-t2"). Run ();
			New Mythread (i+ "-t3"). Run ();
	
		New Mythread (i+ "-t4"). Run ();
	
	Class Mythread implements runnable{private String name;
	Public Mythread (String name) {this.name = name;
			@Override public void Run () {try {thread.sleep (500);
			System.out.println (name+ "-----");
		    URL getUrl = new URL ("Http://127.0.0.1/ThreadPool/sendMsg.do?msg=sendemailNO:" +name);
	        HttpURLConnection connection = (httpurlconnection) getUrl. OpenConnection ();
	        To connect, but actually the GET request will be sent to the server Connection.connect () in the Connection.getinputstream () function in the next sentence. Gets the input stream and reads BufferedReader reader with reader = new BufferedReader (New INPUTSTREAMREader (Connection.getinputstream (), "Utf-8"))//Set encoding, otherwise Chinese garbled String lines;
	        while ((lines = Reader.readline ())!= null) {System.out.println (lines);
	        } reader.close ();
			
		Disconnect the connection connection.disconnect ();
		catch (Exception e) {e.printstacktrace ();
 }
	}
	
}

Test results:

--Current thread pool size "0", Current queue size "0"
--current thread pool size "1", Current queue size "0"
sendmail:sendemailno:0-t1
--Current thread pool size "1", Current queue size "0"
--Current thread pool size "1", Current queue Size "1"
sendmail:sendemailno:0-t2
--Current thread pool size "1", Current queue Size "1"-
-current thread pool size "1", Current queue Size "2" "
sendmail:sendemailno:0-t3
--Current thread pool size" 1 ", Current queue Size" 2 "
--current thread pool size" 1 ", Current queue Size" 3 "
SendMail: Sendemailno:0-t4
--Current thread pool size "1", Current queue Size "3"-
-current thread pool size "1", Current queue Size "4"
sendmail:sendemailno:1-t1
- -Current thread pool size "1", Current queue Size "4"
--current thread pool size "1", Current queue Size "5"
sendmail:sendemailno:1-t2
--Current thread pool size "1", Current queue Size "5"
--Current thread pool size "1", Current queue Size "6"
sendmail:sendemailno:1-t3
--Current thread pool size "1", Current queue Size "6"
--current thread pool size "1", Current Queue Size "7"
sendmail:sendemailno:1-t4
--Current thread pool size "1", Current queue Size "7"
--current thread pool size "1", Current queue Size "8"
SendMail : Sendemailno:2-t1
sendmail:sendemailno:2-t2
sendmail:sendemailno:2-t3