http connection存活期

LINUX会默认保留链接5天再关闭。

import java.util.concurrent.TimeUnit;

import org.apache.http.HeaderElement;
import org.apache.http.HeaderElementIterator;
import org.apache.http.HttpResponse;
import org.apache.http.conn.ConnectionKeepAliveStrategy;
import org.apache.http.message.BasicHeaderElementIterator;
import org.apache.http.protocol.HTTP;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.Args;

public class MyConnectionKeepAliveStrategy implements ConnectionKeepAliveStrategy{


    private int timeToLive;
    private TimeUnit timeUnit;

public MyConnectionKeepAliveStrategy(int timeToLive, TimeUnit timeUnit) {
        this.timeToLive = timeToLive;
        this.timeUnit = timeUnit;
    }

@Override
    public long getKeepAliveDuration(final HttpResponse response, final HttpContext context) {
        Args.notNull(response, "HTTP response");
        final HeaderElementIterator it = new BasicHeaderElementIterator(
                response.headerIterator(HTTP.CONN_KEEP_ALIVE));
        while (it.hasNext()) {
            final HeaderElement he = it.nextElement();
            final String param = he.getName();
            final String value = he.getValue();
            if (value != null && param.equalsIgnoreCase("timeout")) {
                try {
                    return Long.parseLong(value) * 1000;
                } catch(final NumberFormatException ignore) {
                    //do nothing
                }
            }
        }
        return timeUnit.toMillis(timeToLive);
    }

}