以下实例演示了如何使用 net.URL 类的 URL() 构造函数来抓取网页：
/*
author by w3cschool.cc
Main.java
*/import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.FileWriter;import java.io.InputStreamReader;import java.net.URL;public class Main {
public static void main(String[] args)
throws Exception {
URL url = new URL("http://www.w3cschool.cc");
BufferedReader reader = new BufferedReader
(new InputStreamReader(url.openStream()));
BufferedWriter writer = new BufferedWriter
(new FileWriter("data.html"));
String line;
while ((line = reader.readLine()) != null) {
System.out.println(line);
writer.write(line);
writer.newLine();
}
reader.close();
writer.close();
}}以上代码运行输出结果为（网页的源代码，存储在当前目录下的 data.html 文件中）：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=11,IE=10,IE=9,IE=8"/>……
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