第一步抓取資料。
java采集網頁資料。擷取html文本節點
有幾種辦法。
第一種: 采用HttpURLConnection
- package com.yjf.util;
- import java.io.BufferedReader;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.InputStreamReader;
- import java.net.HttpURLConnection;
- import java.net.URL;
- public class HttpWebUtil {
- /**
- *網頁抓取方法
- * @param urlString 要抓取的url位址
- * @param charset 網頁編碼方式
- * @param timeout 逾時時間
- * @return 抓取的網頁内容
- * @throws IOException 抓取異常
- */
- public static String GetWebContent(String urlString, final String charset, int timeout) throws IOException {
- if (urlString == null || urlString.length() == 0) {
- return "";
- }
- urlString = (urlString.startsWith("http://") || urlString.startsWith("https://")) ? urlString : ("http://" + urlString).intern();
- URL url = new URL(urlString);
- HttpURLConnection conn = (HttpURLConnection) url.openConnection();
- conn.setDoOutput(true);
- conn.setRequestProperty("Pragma", "no-cache");
- conn.setRequestProperty("Cache-Control", "no-cache");
- int temp = Integer.parseInt(Math.round(Math.random()*(UserAgent.length-1))+"");
- conn.setRequestProperty(
- "User-Agent",
- UserAgent[temp]); // 模拟手機系統
- conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");//隻接受text/html類型,當然也可以接受圖檔,pdf,*/*任意,就是tomcat/conf/web裡面定義那些
- conn.setConnectTimeout(timeout);
- try {
- if (conn.getResponseCode() != HttpURLConnection.HTTP_OK) {
- return "";
- }
- } catch (Exception e) {
- try {
- System.out.println(e.getMessage());
- } catch (Exception e2) {
- e2.printStackTrace();
- }
- return "";
- }
- InputStream input = conn.getInputStream();
- BufferedReader reader = new BufferedReader(new InputStreamReader(input,
- charset));
- String line = null;
- StringBuffer sb = new StringBuffer("");
- while ((line = reader.readLine()) != null) {
- sb.append(line).append("\r\n");
- }
- if (reader != null) {
- reader.close();
- }
- if (conn != null) {
- conn.disconnect();
- }
- return sb.toString();
- }
- public static String[] UserAgent = {
- "Mozilla/5.0 (Linux; U; Android 2.2; en-us; Nexus One Build/FRF91) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.2",
- "Mozilla/5.0 (iPad; U; CPU OS 3_2_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B500 Safari/531.21.11",
- "Mozilla/5.0 (SymbianOS/9.4; Series60/5.0 NokiaN97-1/20.0.019; Profile/MIDP-2.1 Configuration/CLDC-1.1) AppleWebKit/525 (KHTML, like Gecko) BrowserNG/7.1.18121",
- "Nokia5700AP23.01/SymbianOS/9.1 Series60/3.0",
- "UCWEB7.0.2.37/28/998",
- "NOKIA5700/UCWEB7.0.2.37/28/977",
- "Openwave/UCWEB7.0.2.37/28/978",
- "Mozilla/4.0 (compatible; MSIE 6.0; ) Opera/UCWEB7.0.2.37/28/989"
- };
- }
第二種:采用jar插件Jsoup.jar
org.jsoup.Jsoup
- //站點入口清單
- public static List<String> getSiteUrlList1(List<String> list,String listurl){
- if(list==null || list.size()<=0){
- list = new ArrayList<String>();
- }
- try {
- Document docdata = Jsoup.connect(listurl).timeout(10000).get();
- String hb = ".m_book li a";
- String page = ".page_list .page_up";
- Elements ele = docdata.select(hb);
- for (Element el : ele) {
- list.add(el.attr("href"));
- }
- if(docdata.select(page)!=null && docdata.select(page).first()!=null){
- String url = "http://www.xxxxx.com/site_map/"+docdata.select(page).first().attr("href");
- getSiteUrlList1(list, url);
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- return list;
- }
第三種:http模拟器
可以請求表單資料和 重定向
http://blog.csdn.net/yjflinchong/article/details/8004706