19. 3. 3. 获取更新的过去24小时内的文件 Get files updated last 24 hours
import java.io.BufferedInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import java.net.URLConnection;
import java.util.Date;
public class URLtest3 {
public static void main(String[] args) throws Exception{
Date today = new Date();
System.out.println(today);//Fri Oct 21 16:58:50 CST 2011
//PerDay:每天
long millisecondsPerDay = 24 * 60 * 60 * 1000;//milli:毫、千分之一、这是一天
URL u = new URL("http://www.163.com");
URLConnection uc = u.openConnection();
//将此 URLConnection 的 ifModifiedSince 字段的值设置为指定的值。
uc.setIfModifiedSince((new Date(today.getTime() - millisecondsPerDay)).getTime());
InputStream in = new BufferedInputStream(uc.getInputStream());
Reader r = new InputStreamReader(in);
int c ;
while((c = r.read()) != -1){
System.out.print((char)c);
}
}
}