獲取網頁內容---"User-Agent"

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    主要是通過配置文件加載User-Agent信息，爲後面的獲取獲取網頁提供幫助。

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
 public class BrowserUtil {

    private static final Log logger = LogFactory.getLog(BrowserUtil.class);

    private static List<String> browserList = BrowserUtil.loadBrowser();
    private static int index = -1;

    private static List<String> loadBrowser() {
        List<String> list = new ArrayList<String>();

        String filePath = StringUtil.getClassPath() + "browser.txt";
        File file = new File(filePath);

        if (!file.exists()) {
            return list;
        }

        BufferedReader br = null;
        try {
            br = new BufferedReader(new FileReader(file));
            String line = null;
            while ((line = br.readLine()) != null) {
                list.add(line);
            }
        } catch (FileNotFoundException e) {
            logger.error(BrowserUtil.class, e);
        } catch (IOException e) {
            logger.error(BrowserUtil.class, e);
        } finally {
            try {
                if (br != null) {
                    br.close();
                }
            } catch (IOException e) {
                logger.error(BrowserUtil.class, e);
            }
        }
        logger.info("browser list size :" + list.size());
        return list;
    }

    /**
     * @introduction: 
     * @param:
     * @return:
     */
    public static synchronized String getUserAgent() {
        index++;
        if (index >= browserList.size()) {
            index = -1;
        }
        return browserList.get(index);
    }
}

代碼中用到的文件browser.txt裏面存放的內容如下：

Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0)
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0)
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0)
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; ARM; Trident/6.0)
Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; Sleipnir/2.9.8)
Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.0; Trident/5.0)
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:39.0) Gecko/20100101 Firefox/39.0
Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.81 Safari/537.36
Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko
Mozilla/5.0 (Windows NT 6.3; WOW64; rv:39.0) Gecko/20100101 Firefox/39.0

可以根據自己的需求添加。