我是Java编程的新手。即使newFixedThreadPool设置为28，HttpRequest也只能同时处理<= 4个请求。
newCachedThreadPool，但即使一次也可以处理4个请求。newFixedThreadPool设置为3，则效果很好。server = HttpServer.create(new InetSocketAddress(port), 0);
server.createContext("/", new MyHandler());
server.setExecutor(Executors.newFixedThreadPool(28)); // creates a default executor
ThreadPoolExecutor t = (ThreadPoolExecutor)server.getExecutor();
LOG.info("Pool size " + t.getPoolSize() + " Max Pool size " + t.getMaximumPoolSize() + " Largest pool size " + t.getLargestPoolSize() + " Core pool size " + t.getCorePoolSize() + " actively executing threads " + t.getActiveCount() + " Completed task count " + t.getCompletedTaskCount() + " task count " + t.getTaskCount());
server.start();
static class MyHandler implements HttpHandler {
public void handle(HttpExchange t) throws IOException {
try{
long threadId = Thread.currentThread().getId();
ThreadPoolExecutor t1 = (ThreadPoolExecutor)server.getExecutor();
LOG.info("Thread #" + threadId + " before : Pool size " + t1.getPoolSize() + " Max Pool size " + t1.getMaximumPoolSize() + " Largest pool size " + t1.getLargestPoolSize() + " Core pool size " + t1.getCorePoolSize() + " actively executing threads " + t1.getActiveCount() + " Completed task count " + t1.getCompletedTaskCount() + " task count " + t1.getTaskCount());
LOG.info("Received request on thread #" + threadId);
String response = h.processRequest(t.getRequestURI().toString());
t.sendResponseHeaders(200, response.length());
OutputStream os = t.getResponseBody();
os.write(response.getBytes());
os.close();
LOG.info("Request processed on thread #" + threadId);
LOG.info("Thread #" + threadId + " after : Pool size " + t1.getPoolSize() + " Max Pool size " + t1.getMaximumPoolSize() + " Largest pool size " + t1.getLargestPoolSize() + " Core pool size " + t1.getCorePoolSize() + " actively executing threads " + t1.getActiveCount() + " Completed task count " + t1.getCompletedTaskCount() + " task count " + t1.getTaskCount());
} catch (Exception e) {
LOG.warn("Exception. ", e);
}
}
}
public String processRequest(String req)
{
Thread.sleep(5000);
}
日志输出
19/04/15 16:26:07 : Thread #99 before : Pool size 21 Max Pool size 28 Largest pool size 21 Core pool size 28 actively executing threads 1 Completed task count 20 task count 21
19/04/15 16:26:07 : Received request on thread #99
19/04/15 16:26:07 : Inside Handler Sr. No [1]
19/04/15 16:26:07 : Thread #100 before : Pool size 22 Max Pool size 28 Largest pool size 22 Core pool size 28 actively executing threads 2 Completed task count 20 task count 22
19/04/15 16:26:07 : Received request on thread #100
19/04/15 16:26:07 : Inside Handler Sr. No [2]
19/04/15 16:26:08 : Thread #101 before : Pool size 23 Max Pool size 28 Largest pool size 23 Core pool size 28 actively executing threads 3 Completed task count 20 task count 23
19/04/15 16:26:08 : Received request on thread #101
19/04/15 16:26:08 : Inside Handler Sr. No [3]
19/04/15 16:26:08 : Thread #102 before : Pool size 24 Max Pool size 28 Largest pool size 24 Core pool size 28 actively executing threads 4 Completed task count 20 task count 24
19/04/15 16:26:08 : Received request on thread #102
19/04/15 16:26:08 : Inside Handler Sr. No [4]
19/04/15 16:26:12 : Request processed on thread #99
19/04/15 16:26:12 : Thread #99 after : Pool size 24 Max Pool size 28 Largest pool size 24 Core pool size 28 actively executing threads 4 Completed task count 20 task count 24
19/04/15 16:26:12 : Thread #103 before : Pool size 25 Max Pool size 28 Largest pool size 25 Core pool size 28 actively executing threads 4 Completed task count 21 task count 25
19/04/15 16:26:12 : Received request on thread #103
19/04/15 16:26:12 : Inside Handler Sr. No [5]
19/04/15 16:26:12 : Request processed on thread #100
19/04/15 16:26:12 : Thread #100 after : Pool size 25 Max Pool size 28 Largest pool size 25 Core pool size 28 actively executing threads 4 Completed task count 21 task count 25
19/04/15 16:26:12 : Thread #104 before : Pool size 26 Max Pool size 28 Largest pool size 26 Core pool size 28 actively executing threads 4 Completed task count 22 task count 26
19/04/15 16:26:12 : Received request on thread #104
19/04/15 16:26:12 : Inside Handler Sr. No [6]
19/04/15 16:26:13 : Request processed on thread #101
19/04/15 16:26:13 : Thread #101 after : Pool size 26 Max Pool size 28 Largest pool size 26 Core pool size 28 actively executing threads 4 Completed task count 22 task count 26
19/04/15 16:26:13 : Thread #105 before : Pool size 27 Max Pool size 28 Largest pool size 27 Core pool size 28 actively executing threads 4 Completed task count 23 task count 27
19/04/15 16:26:13 : Received request on thread #105
19/04/15 16:26:13 : Inside Handler Sr. No [7]
19/04/15 16:26:13 : Request processed on thread #102
19/04/15 16:26:13 : Thread #102 after : Pool size 27 Max Pool size 28 Largest pool size 27 Core pool size 28 actively executing threads 4 Completed task count 23 task count 27
19/04/15 16:26:13 : Thread #106 before : Pool size 28 Max Pool size 28 Largest pool size 28 Core pool size 28 actively executing threads 4 Completed task count 24 task count 28
19/04/15 16:26:13 : Received request on thread #106
19/04/15 16:26:13 : Inside Handler Sr. No [8]
19/04/15 16:26:17 : Request processed on thread #103
19/04/15 16:26:17 : Thread #103 after : Pool size 28 Max Pool size 28 Largest pool size 28 Core pool size 28 actively executing threads 4 Completed task count 24 task count 28
19/04/15 16:26:17 : Thread #24 before : Pool size 28 Max Pool size 28 Largest pool size 28 Core pool size 28 actively executing threads 4 Completed task count 25 task count 29
19/04/15 16:26:17 : Received request on thread #24
19/04/15 16:26:17 : Inside Handler Sr. No [9]
19/04/15 16:26:17 : Request processed on thread #104
19/04/15 16:26:17 : Thread #104 after : Pool size 28 Max Pool size 28 Largest pool size 28 Core pool size 28 actively executing threads 4 Completed task count 25 task count 29
为什么它一次只处理4个请求？我在做错什么吗？
谢谢