HttpURLConnection模拟浏览器+网络数据抓取

/**

*网页抓取方法

* @param urlString 要抓取的url地址

* @param charset 网页编码方式

* @param timeout 超时时间

* @return 抓取的网页内容\

* //http://blog.csdn.net/yjflinchong

* @throws IOException 抓取异常

*/

public static String GetWebContent(String urlString, final String charset, int timeout) throws IOException {

if (urlString == null || urlString.length() == 0) {

return null;

}

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");

//http://blog.csdn.net/yjflinchong

int temp = Integer.parseInt(Math.round(Math.random()*7)+"");

conn.setRequestProperty(

"User-Agent",

UserAgent[temp]); // 模拟手机系统

conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");//只接受text/html类型，当然也可以接受图片,pdf,*/*任意，就是tomcat/conf/web里面定义那些

conn.setConnectTimeout(timeout);

try {

if (conn.getResponseCode() != HttpURLConnection.HTTP_OK) {

return null;

}

} catch (Exception e) {

try {

log.printException(e);

} catch (Exception e2) {

e2.printStackTrace();

}

return null;

}

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");

}

//http://blog.csdn.net/yjflinchong

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",

//http://blog.csdn.net/yjflinchong

"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"

};