import java.net.*;
import java.io.*;
public class UrlConnection{
	public static void main(String args[]){
		try{
			/*聲明字符串變量strVar,用于讀取一行信息*/
			String strVar;
			/*聲明url對象，該對象將連接到清華主頁上*/
			URL urlObj = new URL("http://www.tsinghua.edu.cn");
			/*通過URL對象的openConnection()方法生成URLConnection類的對象*/
			URLConnection conObj = urlObj.openConnection();
			/*通過URLConnection對象的getInputStream()方法獲得的InputStream對象,并用它初始化InputStream類對象InStrObj*/
			InputStream InStrObj = conObj.getInputStream();
			/*通過上面的InStrObj生成InputStreamReader類對象readerObj*/
			InputStreamReader readerObj = new InputStreamReader(InStrObj);
			/*生成BufferedReader類對象buffObj*/
			BufferedReader buffObj      = new BufferedReader(readerObj);
			/*while循環用于讀取URL對象指定的HTML文件內容，按行讀取*/
			while((strVar = buffObj.readLine())!=null)
				System.out.println(strVar);
			/*下面的語句將連接關閉*/
			buffObj.close();
		}catch(MalformedURLException e){
			System.err.println("url error");
		}catch(IOException e){
			System.out.println("IO error");
		}		
	}
}