Android导入httpserver报出NoClassDefFoundError错误

单独写了个demo

import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import com.sun.net.httpserver.HttpServer;
import java.io.IOException;
import java.net.InetSocketAddress;

public class MainActivity extends AppCompatActivity {

    private HttpServer server;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startServer();
    }

    private void startServer() {
        try {
            server = HttpServer.create(new InetSocketAddress(10100), 0);
            server.createContext(Environment.getExternalStorageDirectory().getAbsolutePath());
            server.setExecutor(null);
            server.start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        server.stop(0);
    }
}

就是这样到代码 运行时就会报出错误

换版本 下载jar包放入libs也是一样无法解决 求大佬指点

new Thread试试