您可以在conf/server.xml配置中限制可接受/可操作的连接数。
有
<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
maxThreads="16" minSpareThreads="1"/>
和
<Connector executor="tomcatThreadPool"
port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443"
/>
要么
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443"
maxThreads='16'/>
在配置文件，这应该刹车。
根据您的评论，您可以根据cpu计数（Runtime.getRuntime().availableProcessors()）将处理移到专用线程池中（请参阅ExecutorService和Executors。）然后您可以应用有界LinkedBlockingQueue来限制待处理任务的数量（不要忘记指定RejectedExecutionHandler来在队列已满时进行阻塞添加）。
我在项目中使用的示例方法。
/**
* Creates a new thread pool based on some attributes
* @param poolSize the number of worker threads in the thread pool
* @param poolName the name of the thread pool (for debugging purposes)
* @param priority the base priority of the worker threads
* @param capacity the size of the task queue used
* @return the ExecutorService object
*/
private ExecutorService newPool(int poolSize,
String poolName, final int priority, int capacity) {
int cpu = Runtime.getRuntime().availableProcessors();
ExecutorService result = null;
if (poolSize != 0) {
if (poolSize == -1) {
poolSize = cpu;
}
if (capacity <= 0) {
capacity = Integer.MAX_VALUE;
}
result = new ThreadPoolExecutor(poolSize, poolSize,
120, TimeUnit.MINUTES,
new LinkedBlockingQueue<Runnable>(capacity),
new ThreadFactory() {
@Override
public Thread newThread(Runnable runnable) {
Thread t = new Thread(runnable);
t.setPriority(priority);
return t;
}
}, new RejectedExecutionHandler() {
@Override
public void rejectedExecution(Runnable r,
ThreadPoolExecutor executor) {
if (!executor.isShutdown()) {
try {
executor.getQueue().put(r);
} catch (InterruptedException ex) {
// give up
}
}
}
});
}
return result;
}
您可以通过以下方式使用它：
ExecutorService exec = newPool(-1, "converter pool", Thread.NORM_PRIORITY, 500);
servletContext.setAttribute("converter pool", exec);
并在您的servlet中
ExecutorService exec = (ExecutorService)servletContext
.getAttribute("converter pool");
exec.submit(new Runnable() {
public void run() {
// your code for transformation goes here
}
}
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