JAVA socket ¹ØÓÚDNS »º´æ
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1. ÔÚ³ÌÐòÖÐͨ¹ýjava.security.Security.setProperty·½·¨ÉèÖð²È«ÊôÐÔnetworkaddress.cache.ttlµÄÖµ£¨µ¥Î»£ºÃ룩¡£ÈçÏÂÃæµÄ´úÂ뽫»º´æ³¬Ê±ÉèΪ10Ã룺
java.security.Security.setProperty("networkaddress.cache.ttl", 10);
2. ÉèÖÃjava.securityÎļþÖеÄnetworkaddress.cache.negative.ttlÊôÐÔ¡£¼ÙÉèJDKµÄ°²×°Ä¿Â¼ÊÇC£º\jdk1.6£¬ÄÇôjava.securityÎļþλÓÚc£º\jdk1.6\jre\lib\securityĿ¼ÖС£´ò¿ªÕâ¸öÎļþ£¬ÕÒµ½networkaddress.cache.ttlÊôÐÔ£¬²¢½«Õâ¸öÊôÐÔÖµÉèΪÏàÓ¦µÄ»º´æ³¬Ê±£¨µ¥Î»£ºÃ룩¡£
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package mynet;
import java.net.*;
public class MyDNS
{
public static void main(String[] args) throws Exception
{
// args[0]: ±¾»úÃû args[1]£º»º³åʱ¼ä
if (args.length < 2)
return;
java.security.Security.setProperty("networkaddress.cache.ttl", args[1]);
long time = System.currentTimeMillis();
InetAddress addresses1[] = InetAddress.getAllByName(args[0]);
System.out.println("addresses1: "
 
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public class Bubble {
// ðÅÝÅÅÐòº¯Êý1
public static void bubbleSort1(Comparable []data){
int position,scan;
Comparable temp;
for(position = data.length-1;position>=0;position--){
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public class OperatExcel
{
private File file = new File(ParamenterInit.SRCEXCELPATH);
private File outfile = new File(ParamenterInit.DESTEXCELPATH);
private static String sheetName = ParamenterInit.SHEETNAME;
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