學了這么久的java，感覺java還是有很多模式在編程中可以套用的。
如果要將某個URL對應的網頁下載下來，并對其進行操作就可以用下面的模式
public class Down
??? {
??????? public Down(String urlstring )
??????? {
??????????? URL url;
??????????? InputStream in;
??????????? OutputStream out;
??????????? try {
??????????????? url = new URL(urlstring);
??????????????? in = url.openStream();
??????????????? int c;
??????????????? while ((c = in.read()) > -1) {
???????????????????? // do something you want to do
??????????????? }
??????????????? in.close();
??????????? } catch (IOException e) {}
??????? }
??? }