对于网络，我一直处于好奇的态度。以前一直想着写个爬虫，但是一拖再拖，懒得实现，感觉这是一个很麻烦的事情，出现个小错误，就要调试很多时间，太浪费时间。

后来一想，既然早早给自己下了保证，就先实现它吧，从简单开始，慢慢增加功能，有时间就实现一个，并且随时优化代码。

下面是我简单实现爬取指定网页，并且保存的简单实现，其实有几种方式可以实现，这里慢慢添加该功能的几种实现方式。

UrlConnection爬取实现

package html;import java.io.BufferedReader;import java.io.FileOutputStream;import java.io.FileWriter;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;public class Spider { public static void main(String[] args) { String filepath = "d:/124.html"; String url_str = "http://"; String charset = "utf-8"; String filepath = "d:/125.html"; HttpClient hc = new DefaultHttpClient(); HttpGet hg = new HttpGet(url_str); HttpResponse response = hc.execute(hg); HttpEntity entity = response.getEntity(); InputStream htm_in = null; if(entity != null){ System.out.println(entity.getContentLength()); htm_in = entity.getContent(); String htm_str = InputStream2String(htm_in,charset); saveHtml(filepath,htm_str); } } /** * Method: saveHtml * Description: save String to file * @param filepath * file path which need to be saved * @param str * string saved */ public static void saveHtml(String filepath, String str){ try { OutputStreamWriter outs = new OutputStreamWriter(new FileOutputStream(filepath, true), "utf-8"); outs.write(str); outs.close(); } catch (IOException e) { System.out.println("Error at save html..."); e.printStackTrace(); } } /** * Method: InputStream2String * Description: make InputStream to String * @param in_st * inputstream which need to be converted * @param charset * encoder of value * @throws IOException * if an error occurred */ public static String InputStream2String(InputStream in_st,String charset) throws IOException{ BufferedReader buff = new BufferedReader(new InputStreamReader(in_st, charset)); StringBuffer res = new StringBuffer(); String line = ""; while((line = buff.readLine()) != null){ res.append(line); } return res.toString(); }}

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