Java检查URL是否有效

1. importjava.net.URL;
2. importjava.net.HttpURLConnection;
4. publicclassURLCheck{
5. privatebooleanisConnect(Stringurl){
6. booleanflag=false;
7. intcounts=0;
8. if(url==null||url.length()<=0){
9. returnflag;
10. }
11. while(counts<5){
12. try{
13. HttpURLConnectionconnection=(HttpURLConnection)newURL(url)
14. .openConnection();
15. intstate=connection.getResponseCode();
16. if(state==200){
17. //Stringrealurl=connection.getURL().toString();
18. flag=true;
19. }
20. break;
21. }catch(Exceptionex){
22. counts++;
23. continue;
24. }
25. }
26. returnflag;
27. }
29. publicstaticvoidmain(String[]args){
30. URLCheckcheck=newURLCheck();
31. System.out.println(check.isConnect("http://gaojin.javaeye.com"));
32. }
33. }