Java修改Hosts文件——HostUtils.java

import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.stream.Collectors;

/**
 * 修改hosts文件
 * @author yk.luo
 */
public abstract class HostUtils {
 private static final Path HOSTS_PATH = Paths.get("C:\\Windows\\System32\\drivers\\etc\\hosts");
 private static final String ENDL = String.format("%n");

 public static Set read() {
 return Arrays.stream(LocalFileIOUtils.getInstance().read(HOSTS_PATH).split(ENDL))
 .filter(it->!it.trim().matches("(^#.*)|(\\s*)"))
 .map(it->it.replaceAll("#.*", "").trim().replaceAll("\\s+", "\t"))
 .collect(Collectors.toSet());
 }

 public static boolean append(String ip, String url) {
 Set sets = HostUtils.read();
 sets.add(String.format("%s\t%s", ip, url));
 return LocalFileIOUtils.getInstance().write(HOSTS_PATH, sets.stream().collect(Collectors.joining(ENDL))) && flushdns();
 }

 public static boolean exists(String ip, String url) {
 return HostUtils.read().contains(String.format("%s\t%s", ip, url));
 }

 public static boolean flushdns() {
 try {
 Runtime.getRuntime().exec("ipconfig /flushdns");
 return true;
 } catch (IOException e) {
 e.printStackTrace();
 return false;
 }
 }

 public static void main(String[] args) {
 int nThreads = 16;
 ExecutorService executorService = Executors.newCachedThreadPool();
 while (nThreads-- > 0) {
 executorService.execute(()->{
 boolean rst = HostUtils.append("0.0.0.0", "www.baidu.com");
 System.out.println(rst);
 HostUtils.read().forEach(System.out::println);
 });
 }
 executorService.shutdown();
 }

}