！！！惊喜在下面！！！

1、Update Hosts

import java.awt.Desktop;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;

/**
 * 更新Hosts文件
 *
 * @author MrChu
 * @version 1.0
 * @date 2015年1月16日
 * @see www.chuweibiao.com
 */
public class UpdateHosts {

	/** HTML页面路径 */
	private static final String PAGE_URL = "http://www.360kb.com/kb/2_122.html";

	/** Hosts文件路径 */
	private static final String HOSTS_PATH = "C:\\Windows\\System32\\drivers\\etc\\hosts";

	/** Hosts备份文件路径 */
	private static final String HOSTS_BAK_PATH = "C:\\Windows\\System32\\drivers\\etc\\hosts.bak";

	/**
	 * 根据页面URL获取HTML内容
	 * @param pageUrl
	 * 		页面URL
	 * @return
	 * 		HTML内容
	 */
	public static String getHtmlContent(String pageUrl) {
		StringBuffer sb = new StringBuffer();
		BufferedReader in = null;
		try {
			URL url = new URL(pageUrl);
			in = new BufferedReader(new InputStreamReader(url.openStream(), "utf-8"));
			String temp;
			while ((temp = in.readLine()) != null) {
				sb.append(temp);
			}
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				in.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		int begin = sb.indexOf("#google hosts 2015 by 360kb.com");
		int end = sb.indexOf("#google hosts 2015 end") + 22;
		return sb.substring(begin, end).toString();
    }

	/**
	 * 转换HTML内容
	 * @param pageUrl
	 * 		页面URL
	 * @return
	 * 		转换后的HTML内容
	 */
	public static String convertHtmlContent(String pageUrl) {
		String content = getHtmlContent(pageUrl);
		content = content.replaceAll("(<br />)+?", "\r\n");
		content = content.replaceAll("    ", " ");
		content = content.replaceAll(" ", "");
		content = content.replaceAll("  ", " ");
		content = content.replaceAll("</span></p><p>	<span><span style=\"line-height:22px;\"><span>", "\r\n");
		content = content.replaceAll("<span> </span>", " ");
		content = content.replaceAll("</span> ", "");
		content = content.replaceAll("</span>", "");
		return content;
	}

	/**
	 * 读取Hosts文件
	 * @param filePath
	 * 		Hosts文件路径
	 * @return
	 * 		Hosts文件内容
	 */
	public static String readHosts(String filePath) {
		FileReader fileReader = null;
		BufferedReader bufferedReader = null;
		StringBuilder sb = new StringBuilder();
		try {
			fileReader = new FileReader(filePath);
			bufferedReader = new BufferedReader(fileReader);
			String line = null;
			while ((line = bufferedReader.readLine()) != null) {
				sb.append(line).append("\r\n");
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				fileReader.close();
				bufferedReader.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return sb.toString();
	}

	/**
	 * 更新Hosts文件
	 * @param filePath
	 * 		Hosts文件路径
	 * @param content
	 * 		Hosts文件内容
	 */
	public static void updateHosts(String filePath, String content) {
		FileWriter fileWriter = null;
		BufferedWriter bufferedWriter = null;
		try {
			File file = new File(filePath);
			if (!file.exists()) {
				file.createNewFile();
			}
			fileWriter = new FileWriter(filePath);
			bufferedWriter = new BufferedWriter(fileWriter);
			bufferedWriter.write(content);
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				fileWriter.flush();
				bufferedWriter.flush();
				fileWriter.close();
				bufferedWriter.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	public static void main(String[] args) {
		// Hosts文件备份
		String hostsContent = "";
		File file = new File(HOSTS_BAK_PATH);
		if (file.exists()) {
			hostsContent = readHosts(HOSTS_BAK_PATH);
		} else {
			hostsContent = readHosts(HOSTS_PATH);
			updateHosts(HOSTS_BAK_PATH , hostsContent);
		}

		// Hosts文件更新
		String newHostsContent = hostsContent + "\r\n" + convertHtmlContent(PAGE_URL);
		updateHosts(HOSTS_PATH, newHostsContent);
		System.out.println("\r\n▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽");
		System.out.println("\r\n  ▇▆▄▃▂▁Hosts文件更新成功！▁▂▃▄▆▇\r\n");
		System.out.println("△△△△△△△△△△△△△△△△△△△△△△△△");

		// 浏览器访问测试可行性
		try {
            URI uri = new URI("http://www.google.com/");
            Desktop.getDesktop().browse(uri);
        } catch (URISyntaxException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
	}

}

2、Restore Hosts

import java.io.File;

/**
 * 还原Hosts文件
 *
 * @author MrChu
 * @version 1.0
 * @date 2015年1月16日
 * @see www.chuweibiao.com
 */
public class RestoreHosts {

	/** Hosts文件路径 */
	private static final String HOSTS_PATH = "C:\\Windows\\System32\\drivers\\etc\\hosts";

	/** Hosts备份文件路径 */
	private static final String HOSTS_BAK_PATH = "C:\\Windows\\System32\\drivers\\etc\\hosts.bak";

	/**
	 * 还原Hosts文件
	 * @return
	 * 		true：还原成功，false：还原失败
	 */
	public static boolean restoreHosts() {
		File file = new File(HOSTS_BAK_PATH);
		if (!file.exists()) {
			return false;
		} else {
			UpdateHosts.updateHosts(HOSTS_PATH, UpdateHosts.readHosts(HOSTS_BAK_PATH));
			return file.delete();
		}
	}

	public static void main(String[] args) {
		if (restoreHosts()) {
			System.out.println("\r\n▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽");
			System.out.println("\r\n  ▇▆▄▃▂▁Hosts文件还原成功！▁▂▃▄▆▇\r\n");
			System.out.println("△△△△△△△△△△△△△△△△△△△△△△△△");
		} else {
			System.out.println("\r\n▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽▽");
			System.out.println("\r\n  ▇▆▄▃▂▁还原失败，Hosts备份文件不存在！▁▂▃▄▆▇\r\n");
			System.out.println("△△△△△△△△△△△△△△△△△△△△△△△△△△△△△△");
		}
	}

}

Crossing The Great Wall（史上最简单无公害翻墙之术......）：

http://download.csdn.net/detail/for_china2012/8368737