java中如何根据一个网址获得该网页的源代码，急求

如题，然后某个词在网页中出现次数怎么算？要具体代码

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(网址);
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);
}
}
}

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