JAVA使用爬虫抓取网站网页内容的方法

// 第一种方法//这种方法是用apache提供的包,简单方便//但是要用到以下包:commons-codec-1.4.jar// commons-httpclient-3.1.jar// commons-logging-1.0.4.jarpublic static String createhttpClient(String url, String param) {  HttpClient client = new HttpClient();  String response = null;  String keyword = null;  PostMethod postMethod = new PostMethod(url);//  try {//   if (param != null)//    keyword = new String(param.getBytes("gb2312"), "ISO-8859-1");//  } catch (UnsupportedEncodingException e1) {//   // TODO Auto-generated catch block//   e1.printStackTrace();//  }  // NameValuePair[] data = { new NameValuePair("keyword", keyword) };  // // 将表单的值放入postMethod中  // postMethod.setRequestBody(data);  // 以上部分是带参数抓取,我自己把它注销了．大家可以把注销消掉研究下  try {   int statusCode = client.executeMethod(postMethod);   response = new String(postMethod.getResponseBodyAsString()     .getBytes("ISO-8859-1"), "gb2312");     //这里要注意下 gb2312要和你抓取网页的编码要一样   String p = response.replaceAll("//&[a-zA-Z]{1,10};", "")     .replaceAll("<[^>]*>", "");//去掉网页中带有html语言的标签   System.out.println(p);  } catch (Exception e) {   e.printStackTrace();  }  return response;}// 第二种方法// 这种方法是JAVA自带的URL来抓取网站内容public String getPageContent(String strUrl, String strPostRequest,   int maxLength) {  // 读取结果网页  StringBuffer buffer = new StringBuffer();  System.setProperty("sun.net.client.defaultConnectTimeout", "5000");  System.setProperty("sun.net.client.defaultReadTimeout", "5000");  try {   URL newUrl = new URL(strUrl);   HttpURLConnection hConnect = (HttpURLConnection) newUrl     .openConnection();   // POST方式的额外数据   if (strPostRequest.length() > 0) {    hConnect.setDoOutput(true);    OutputStreamWriter out = new OutputStreamWriter(hConnect      .getOutputStream());    out.write(strPostRequest);    out.flush();    out.close();   }   // 读取内容   BufferedReader rd = new BufferedReader(new InputStreamReader(     hConnect.getInputStream()));   int ch;   for (int length = 0; (ch = rd.read()) > -1     && (maxLength <= 0 || length < maxLength); length++)    buffer.append((char) ch);   String s = buffer.toString();   s.replaceAll("//&[a-zA-Z]{1,10};", "").replaceAll("<[^>]*>", "");   System.out.println(s);   rd.close();   hConnect.disconnect();   return buffer.toString().trim();  } catch (Exception e) {   // return "错误:读取网页失败！";   //   return null;  }}

public static void main(String[] args) {  String url = "//www.VeVB.COm";  String keyword = "武林网";  createhttpClient p = new createhttpClient();  String response = p.createhttpClient(url, keyword);  // 第一种方法  // p.getPageContent(url, "post", 100500);//第二种方法}