java 获取网页指定内容

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class HttpTest {
 String urlString;
 public static void main(String[] args) throws Exception {
  HttpTest client = new HttpTest("http://www.baidu.com");
  client.run();
 }
 public HttpTest(String urlString) {
  this.urlString = urlString;
 }
 public void run() throws Exception {
  //生成一个URL对象
  URL url = new URL(urlString);
  //打开URL
  HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
  //得到输入流，即获得了网页的内容
  BufferedReader reader = new BufferedReader(new InputStreamReader(urlConnection
    .getInputStream()));
  String line;
  // 读取输入流的数据，并显示
  while ((line = reader.readLine()) != null){
   System.out.println(line);
  }
 }
}