Java 实例 - 网页抓取

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 itshubao.com
 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.itshubao.com");
      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 lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
...