java采集網頁 抓取網頁

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

/**

java采集網頁
*/
public class HttpWebCollecter {
/**

網頁抓取方法

@param urlString
要抓取的url地址
@param charset
網頁編碼方式
@param timeout
超時時間
@return 抓取的網頁內容
@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]); // 模擬手機系統
conn.setRequestProperty("Accept",
"text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8");// 只接受text/html類型，當然也可以接受圖片,pdf,/任意，就是tomcat/conf/web里面定義那些
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" };




}</pre>