\u7ee7\u201c\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u6a21\u578b\u7814\u7a76\u201d\u6587\u7ae0\u53d1\u5e03\u540e\uff0c\u6700\u8fd1\u53c8\u7ee7\u7eed\u7814\u7a76\uff0c\u63a8\u51fa\u4e00\u4e2a\u6bd4\u8f83\u590d\u6742\u4f46\u529f\u80fd\u6bd4\u8f83\u5b8c\u5584\uff0c\u800c\u4e14\u53ef\u4ee5\u76f4\u63a5\u5957\u7528\u7684\u7ebf\u7a0b\u6c60\u7684\u5b9e\u4f8b\uff0c\u5e0c\u671b\u5bf9\u4f7f\u7528\u591a\u7ebf\u7a0b\u8bbe\u8ba1\u7684\u8bfb\u8005\u6709\u6240\u5e2e\u52a9\u3002
\n<\/p>\n
\u8be5\u5b9e\u4f8b\u6765\u6e90\u4e8eApache\u9879\u76ee\u6e90\u4ee3\u7801\uff0c\u6e90\u7a0b\u5e8f\u6709800\u4f59\u884c\uff0c\u529f\u80fd\u6bd4\u8f83\u5168\u9762\uff0c\u800c\u4e14\u662f\u975e\u5e38\u5b8c\u5584\u7684\uff0c\u5e76\u4e14\u8fd0\u884c\u4e8e\u8bf8\u591a\u670d\u52a1\u5668\u5982tomcat\u4e0a\uff0c\u5c31\u662f\u5206\u6790\u8d77\u6765\u6709\u70b9\u7e41\u7410\u3002\u5982\u679c\u5f00\u53d1\u4eba\u5458\u76f4\u63a5\u628a\u8fd9\u6bb5\u7a0b\u5e8f\u62ff\u6765\u4fee\u6539\u540e\u4f7f\u7528\u5230\u81ea\u5df1\u7684\u5f00\u53d1\u9879\u76ee\u4e2d\uff0c\u4e0d\u5931\u4e3a\u62ff\u6765\u4e3b\u4e49\u7684\u4e0a\u7b56\u3002<\/p>\n
\u672c\u6587\u5bf9\u8be5\u6e90\u7a0b\u5e8f\u8fdb\u884c\u4e86\u4fee\u6539\u548c\u7b80\u5316\uff0c\u5bf9\u5176\u4e2d\u6838\u5fc3\u90e8\u5206\u8fdb\u884c\u5206\u6790\uff0c\u7136\u540e\u521b\u5efa\u6d4b\u8bd5\u7c7b\u8fdb\u884c\u6d4b\u8bd5\u3002\u8bfb\u8005\u5b66\u4e60\u4e4b\u540e\u53ef\u4ee5\u76f4\u63a5\u6a21\u4eff\u548c\u5957\u7528\uff0c\u800c\u4e0d\u9700\u8981\u82b1\u8d39\u5927\u91cf\u65f6\u95f4\u81ea\u5df1\u4eb2\u81ea\u518d\u53bb\u5199\u7ebf\u7a0b\u6c60\u7a0b\u5e8f\u4e86\u3002<\/p>\n
\u5173\u952e\u7684\u7a0b\u5e8f\u67092\u4e2a:\u7ebf\u7a0b\u6c60\u7c7b\uff08ThreadPool\uff09\u548c\u7ebf\u7a0b\u6c60\u63a5\u53e3\uff08ThreadPoolRunnable\uff09\u3002<\/p>\n
\u9996\u5148\u770b\u8f83\u590d\u6742\u7684\u7ebf\u7a0b\u6c60\u7c7b\u7a0b\u5e8f\uff0c\u6587\u4ef6\u540d\u4e3aThreadPool.java\uff0c\u6709200\u4f59\u884c\uff0c\u9700\u8981\u8bfb\u8005\u6709\u8010\u5fc3\uff0c\u5185\u5bb9\u5982\u4e0b\uff1a
\n—————————————————————————————
\n[java]import java.util.Vector;<\/p>\n
public class ThreadPool {
\n public static final int MAX_THREADS = 100;
\n public static final int MAX_SPARE_THREADS = 50;
\n public static final int MIN_SPARE_THREADS = 10;
\n public static final int WORK_WAIT_TIMEOUT = 60 * 1000;<\/p>\n
protected Vector pool;
\n protected MonitorRunnable monitor;
\n protected int maxThreads;
\n protected int minSpareThreads;
\n protected int maxSpareThreads;
\n protected int currentThreadCount;
\n protected int currentThreadsBusy;
\n protected boolean stopThePool;<\/p>\n
public ThreadPool() {
\n maxThreads = MAX_THREADS;
\n maxSpareThreads = MAX_SPARE_THREADS;
\n minSpareThreads = MIN_SPARE_THREADS;
\n currentThreadCount = 0;
\n currentThreadsBusy = 0;
\n stopThePool = false;
\n }<\/p>\n
public synchronized void start() {
\n adjustLimits();
\n openThreads(minSpareThreads);
\n monitor = new MonitorRunnable(this);
\n }<\/p>\n
public void setMaxThreads(int maxThreads) {
\n this.maxThreads = maxThreads;
\n }<\/p>\n
public int getMaxThreads() {
\n return maxThreads;
\n }<\/p>\n
public void setMinSpareThreads(int minSpareThreads) {
\n this.minSpareThreads = minSpareThreads;
\n }<\/p>\n
public int getMinSpareThreads() {
\n return minSpareThreads;
\n }<\/p>\n
public void setMaxSpareThreads(int maxSpareThreads) {
\n this.maxSpareThreads = maxSpareThreads;
\n }<\/p>\n
public int getMaxSpareThreads() {
\n return maxSpareThreads;
\n }<\/p>\n
public void runIt(ThreadPoolRunnable r) {
\n if (null == r) {
\n throw new NullPointerException();
\n }
\n if (0 == currentThreadCount || stopThePool) {
\n throw new IllegalStateException();
\n }
\n ControlRunnable c = null;
\n synchronized (this) {
\n if (currentThreadsBusy == currentThreadCount) {
\n if (currentThreadCount < maxThreads) {
\n int toOpen = currentThreadCount + minSpareThreads;
\n openThreads(toOpen);
\n } else {
\n while (currentThreadsBusy == currentThreadCount) {
\n try {
\n this.wait();
\n }catch (InterruptedException e) {
\n }
\n if (0 == currentThreadCount || stopThePool) {
\n throw new IllegalStateException();
\n }
\n }
\n }
\n }
\n c = (ControlRunnable) pool.lastElement();
\n pool.removeElement(c);
\n currentThreadsBusy++;
\n }
\n c.runIt(r);
\n }<\/p>\n
public synchronized void shutdown() {
\n if (!stopThePool) {
\n stopThePool = true;
\n monitor.terminate();
\n monitor = null;
\n for (int i = 0; i < (currentThreadCount – currentThreadsBusy); i++) {
\n try {
\n ((ControlRunnable) (pool.elementAt(i))).terminate();
\n } catch (Throwable t) {
\n }
\n }
\n currentThreadsBusy = currentThreadCount = 0;
\n pool = null;
\n notifyAll();
\n }
\n }<\/p>\n
protected synchronized void checkSpareControllers() {
\n if (stopThePool) {
\n return;
\n }<\/p>\n
if ((currentThreadCount – currentThreadsBusy) > maxSpareThreads) {
\n int toFree = currentThreadCount – currentThreadsBusy – maxSpareThreads;
\n for (int i = 0; i < toFree; i++) {
\n ControlRunnable c = (ControlRunnable) pool.firstElement();
\n pool.removeElement(c);
\n c.terminate();
\n currentThreadCount–;
\n }
\n }
\n }<\/p>\n
protected synchronized void returnController(ControlRunnable c) {
\n if (0 == currentThreadCount || stopThePool) {
\n c.terminate();
\n return;
\n }
\n currentThreadsBusy–;<\/p>\n
pool.addElement(c);
\n notify();
\n }<\/p>\n
protected synchronized void notifyThreadEnd() {
\n currentThreadsBusy–;
\n currentThreadCount–;
\n notify();
\n openThreads(minSpareThreads);
\n }<\/p>\n
protected void adjustLimits() {
\n if (maxThreads <= 0) {
\n maxThreads = MAX_THREADS;
\n }
\n if (maxSpareThreads >= maxThreads) {
\n maxSpareThreads = maxThreads;
\n }
\n if (maxSpareThreads <= 0) {
\n if (1 == maxThreads) {
\n maxSpareThreads = 1;
\n } else {
\n maxSpareThreads = maxThreads \/ 2;
\n }
\n }
\n if (minSpareThreads > maxSpareThreads) {
\n minSpareThreads = maxSpareThreads;
\n }
\n if (minSpareThreads <= 0) {
\n if (1 == maxSpareThreads) {
\n minSpareThreads = 1;
\n } else {
\n minSpareThreads = maxSpareThreads \/ 2;
\n }
\n }
\n }<\/p>\n
protected void openThreads(int toOpen) {
\n if (toOpen > maxThreads) {
\n toOpen = maxThreads;
\n }
\n if (0 == currentThreadCount) {
\n pool = new Vector(toOpen);
\n }
\n for (int i = currentThreadCount; i < toOpen; i++) {
\n pool.addElement(new ControlRunnable(this));
\n }
\n currentThreadCount = toOpen;
\n }<\/p>\n
class MonitorRunnable implements Runnable {
\n ThreadPool p;
\n Thread t;
\n boolean shouldTerminate;
\n MonitorRunnable(ThreadPool p) {
\n shouldTerminate = false;
\n this.p = p;
\n t = new Thread(this);
\n t.start();
\n }
\n public void run() {
\n while (true) {
\n try {
\n synchronized (this) {
\n this.wait(WORK_WAIT_TIMEOUT);
\n }
\n if (shouldTerminate) {
\n break;
\n }
\n p.checkSpareControllers();
\n } catch (Throwable t) {
\n t.printStackTrace();
\n }
\n }
\n }<\/p>\n
public synchronized void terminate() {
\n shouldTerminate = true;
\n this.notify();
\n }
\n }<\/p>\n
class ControlRunnable implements Runnable {
\n ThreadPool p;
\n Thread t;
\n ThreadPoolRunnable toRun;
\n boolean shouldTerminate;
\n boolean shouldRun;
\n boolean noThData;
\n Object thData[] = null;<\/p>\n
ControlRunnable(ThreadPool p) {
\n toRun = null;
\n shouldTerminate = false;
\n shouldRun = false;
\n this.p = p;
\n t = new Thread(this);
\n t.start();
\n noThData = true;
\n thData = null;
\n }<\/p>\n
public void run() {
\n while (true) {
\n try {
\n synchronized (this) {
\n if (!shouldRun && !shouldTerminate) {
\n this.wait();
\n }
\n }
\n if (shouldTerminate) {
\n break;
\n }
\n try {
\n if (noThData) {
\n thData = toRun.getInitData();
\n noThData = false;
\n }
\n if (shouldRun) {
\n toRun.runIt(thData);
\n }
\n } catch (Throwable t) {
\n System.err.println("ControlRunnable Throwable: ");
\n t.printStackTrace();
\n shouldTerminate = true;
\n shouldRun = false;
\n p.notifyThreadEnd();
\n } finally {
\n if (shouldRun) {
\n shouldRun = false;
\n p.returnController(this);
\n }
\n }
\n if (shouldTerminate) {
\n break;
\n }
\n } catch (InterruptedException ie) {
\n }
\n }
\n }<\/p>\n
public synchronized void runIt(ThreadPoolRunnable toRun) {
\n if (toRun == null) {
\n throw new NullPointerException("No Runnable");
\n }
\n this.toRun = toRun;
\n shouldRun = true;
\n this.notify();
\n }<\/p>\n
public synchronized void terminate() {
\n shouldTerminate = true;
\n this.notify();
\n }
\n }
\n}[\/java]
\n—————————————————————————————
\n\u4ee5\u4e0a\u7a0b\u5e8f\u4e2d\uff0c\u5173\u952e\u7684\u662fopenThreads\u65b9\u6cd5\u3001runIt\u65b9\u6cd5\u4ee5\u53ca2\u4e2a\u5185\u90e8\u7c7b\uff1aMonitorRunnable\u548cControlRunnable\u3002<\/p>\n
\u521a\u5f00\u59cb\u8fd0\u884c\u7684\u65f6\u5019\uff0c\u7ebf\u7a0b\u6c60\u4f1a\u5f80Vector\u5bf9\u8c61\u91cc\u88c5\u5165minSpareThreads\u4e2a\u5143\u7d20\uff0c\u6bcf\u4e2a\u5143\u7d20\u90fd\u662fControlRunnable\u7ebf\u7a0b\u7c7b\uff0cControlRunnable\u7c7b\u5728\u5176\u6784\u9020\u65b9\u6cd5\u4e2d\u542f\u52a8\u7ebf\u7a0b\u3002\u5982\u679cshouldRun\u548cshouldTerminate\u90fd\u662ffalse\u7684\u8bdd\uff0c\u7ebf\u7a0b\u5c31\u7b49\u5f85\u3002\u5982\u679cshouldRun\u4e3atrue\uff0c\u5c31\u8c03\u7528ThreadPoolRunnable\u7684runIt(Object[])\u65b9\u6cd5\uff0c\u8be5\u63a5\u53e3\u7684\u65b9\u6cd5\u5c31\u662f\u6211\u4eec\u9700\u8981\u5728\u81ea\u5df1\u7684\u4efb\u52a1\u7c7b\u4e2d\u8986\u76d6\u7684\u65b9\u6cd5\u3002<\/p>\n
\u5982\u679cminSpareThreads\u4e2a\u7ebf\u7a0b\u90fd\u5904\u4e8eBusy\u540e\uff0c\u7ebf\u7a0b\u6c60\u4f1a\u518d\u521b\u5efa\u51faminSpareThreads\u4e2a\u7ebf\u7a0b\u3002MonitorRunnable\u662f\u7528\u6765\u76d1\u89c6\u7ebf\u7a0b\u6c60\u8fd0\u884c\u60c5\u51b5\u7684\uff0c\u5176\u7ebf\u7a0b\u95f4\u969460\u79d2\uff08WORK_WAIT_TIMEOUT\uff09\u8c03\u7528\u4e00\u6b21\u7ebf\u7a0b\u6c60\u7c7b\u7684checkSpareControllers\u65b9\u6cd5\uff0c\u5982\u679c\u53d1\u73b0(currentThreadCount – currentThreadsBusy) > maxSpareThreads\uff0c\u5c31\u4f1a\u8c03\u7528ControlRunnable\u7c7b\u7684terminate\u65b9\u6cd5\u5220\u9664\u7a7a\u95f2\u7ebf\u7a0b\uff0c\u51c6\u5907\u5220\u9664\u7684\u7ebf\u7a0b\u662f\u5426\u7a7a\u95f2\u662f\u901a\u8fc7shouldTerminate\u53c2\u6570\u6765\u5224\u65ad\u7684\u3002<\/p>\n
\u7ebf\u7a0b\u6c60\u63a5\u53e3ThreadPoolRunnable\u67092\u4e2a\u7a7a\u65b9\u6cd5getInitData\u548crunIt\uff0c\u6211\u4eec\u4e00\u822c\u81ea\u5df1\u521b\u5efa\u4e00\u4e2a\u4efb\u52a1\u7c7b\u5b9e\u73b0\u8fd9\u4e2a\u7ebf\u7a0b\u6c60\u63a5\u53e3\u5c31\u53ef\u4ee5\u4e86\uff0c\u628a\u5177\u4f53\u7684\u4efb\u52a1\u5185\u5bb9\u653e\u5728\u4efb\u52a1\u7c7b\u7684runIt\u65b9\u6cd5\u4e2d\u3002\u5982\u679c\u4e0d\u60f3\u7528getInitData\uff0c\u5c31\u8ba9\u5b83\u8fd4\u56denull\u503c\u3002<\/p>\n
\u7ebf\u7a0b\u6c60\u63a5\u53e3\u7a0b\u5e8f\u5f88\u7b80\u5355\uff0c\u6587\u4ef6\u540d\u4e3aThreadPoolRunnable.java\uff0c\u5c31\u51e0\u884c\uff0c\u5185\u5bb9\u5982\u4e0b\uff1a
\n———————————————————————————————
\n[java]public interface ThreadPoolRunnable {
\n public Object[] getInitData();<\/p>\n
public void runIt(Object thData[]);<\/p>\n
}[\/java]
\n———————————————————————————————<\/p>\n
\u7ebf\u7a0b\u6c60\u7c7b\u548c\u7ebf\u7a0b\u6c60\u63a5\u53e3\u90fd\u5df2\u7ecf\u8bf4\u5b8c\uff0c\u4e0b\u9762\u5c31\u4e3e\u4e2a\u4f8b\u5b50\u8bf4\u8bf4\u600e\u4e48\u4f7f\u7528\u5b83\u4eec\u4e86\u3002<\/p>\n
\u6211\u4eec\u7684\u4efb\u52a1\u8fd8\u662f\u626b\u63cf\u7aef\u53e3\uff08\u8bf7\u53c2\u8003\u6211\u7684\u201c\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u6a21\u578b\u7814\u7a76\u201d\uff09\uff0c\u6587\u4ef6\u540d\u4e3aTestThreadPool.java\uff0c\u5185\u5bb9\u5982\u4e0b\uff1a
\n———————————————————————————————
\n[java]import java.net.InetAddress;
\nimport java.net.Socket;<\/p>\n
public class TestThreadPool {<\/p>\n
public static void main(String[] args) {
\n String host = null; \/\/\u7b2c\u4e00\u4e2a\u53c2\u6570\uff0c\u76ee\u6807\u4e3b\u673a\u3002
\n int beginport = 1; \/\/\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u5f00\u59cb\u7aef\u53e3\u3002
\n int endport = 65535; \/\/\u7b2c\u4e09\u4e2a\u53c2\u6570\uff0c\u7ed3\u675f\u7aef\u53e3\u3002
\n try{
\n host = args[0];
\n beginport = Integer.parseInt(args[1]);
\n endport = Integer.parseInt(args[2]);
\n if(beginport <= 0 || endport >= 65536 || beginport > endport){
\n throw new Exception("Port is illegal");
\n }
\n }catch(Exception e){
\n System.out.println("Usage: java PortScannerSingleThread host beginport endport");
\n System.exit(0);
\n }<\/p>\n
ThreadPool tp = new ThreadPool();
\n tp.setMaxThreads(100);
\n tp.setMaxSpareThreads(50);
\n tp.setMinSpareThreads(10);
\n tp.start();<\/p>\n
for(int i = beginport; i <= endport; i++){
\n Task task = new Task(host,i);
\n tp.runIt(task);
\n }
\n }<\/p>\n
}<\/p>\n
class Task implements ThreadPoolRunnable{
\n String host;
\n int port;<\/p>\n
Task(String host, int port){
\n this.host = host;
\n this.port = port;
\n }<\/p>\n
public Object[] getInitData(){
\n return null;
\n }<\/p>\n
public void runIt(Object thData[]){
\n Socket s = null;
\n try{
\n s = new Socket(InetAddress.getByName(host),port);
\n System.out.println("The port " + port + " at " + host + " is open.");
\n }catch(Exception e){<\/p>\n
}finally{
\n try{
\n if(s != null) s.close();
\n }catch(Exception e){
\n }
\n }
\n }
\n}[\/java]
\n———————————————————————————————–
\n\u5728TestThreadPool\u7c7b\u7684main\u65b9\u6cd5\u4e2d\u5b9a\u4e49\u4e86\u4e09\u4e2a\u53c2\u6570\uff0c\u5206\u522b\u662f\u76ee\u6807\u4e3b\u673aIP\u5730\u5740\uff0c\u5f00\u59cb\u7aef\u53e3\u548c\u7ed3\u675f\u7aef\u53e3\u3002\u7136\u540e\u901a\u8fc7new ThreadPool()\u521b\u5efa\u7ebf\u7a0b\u6c60\u7c7b\uff0c\u5e76\u901a\u8fc7setMaxThreads\u3001setMaxSpareThreads\u548csetMinSpareThreads\u8bbe\u7f6e\u7ebf\u7a0b\u6c60\u7684maxThreads\u3001maxSpareThreads\u548cminSpareThreads\u53c2\u6570\u3002Task\u7c7b\u901a\u8fc7\u5b9e\u73b0ThreadPoolRunnable\u63a5\u53e3\uff0c\u5728runIt\u4e2d\u5b9a\u4e49\u4e86\u5177\u4f53\u5185\u5bb9\uff08\u521b\u5efaSocket\u5bf9\u8c61\u8fbe\u5230\u626b\u63cf\u7aef\u53e3\u7684\u76ee\u7684\uff09\u3002<\/p>\n
\u4ee5\u4e0a\u7a0b\u5e8f\u90fd\u5728JDK1.4.2\u7684\u73af\u5883\u4e0b\u7f16\u8bd1\u5e76\u8fd0\u884c\u901a\u8fc7\uff0c\u8f93\u5165 java TestThreadPool 10.1.1.182 1 10000 \u8fd0\u884c\u5f97\u51fa\u5982\u4e0b\u7ed3\u679c\uff1a
\nThe port 25 at 10.1.1.182 is open.
\nThe port 110 at 10.1.1.182 is open.
\nThe port 135 at 10.1.1.182 is open.
\n…
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