Java 异步任务不是'；获取网页的html内容并不完美

我在这里是一个初学者，并遵循一个教程，该教程使用异步任务在我的Logcat中获取网页，但我的应用程序只能保护来自极少数站点的页面，在许多站点上，它返回空白或生成非常不可读的HTML格式。另外，由于AsyncTask越来越不受欢迎，请告诉我们如何高效地执行相同的功能。可能使用处理程序、截击、改装、服务或其他方式。任何帮助都将不胜感激

public class MainActivity extends AppCompatActivity {

public class downloadPage extends AsyncTask<String, Void, String>{

    @Override
    protected String doInBackground(String... urls) {

        String result = "";
        URL url;
        HttpURLConnection urlConnection = null;

        try{
            url = new URL(urls[0]);
            urlConnection = (HttpURLConnection) url.openConnection();
            InputStream inside = urlConnection.getInputStream();
            InputStreamReader reader = new InputStreamReader(inside);
            int data = reader.read();

            while (data != -1){
                char current = (char) data;
                 result += current;

                 data = reader.read();
            }

            return result;

        } catch (Exception e) {
            Log.e("Here is","The error",e);
        }

        return "Task Done";
    }
}

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

    downloadPage page = new downloadPage();
    String result = null;
    try {
        result = page.execute("https://docs.python.org/3/").get();
    } catch (Exception e){
        Log.e("TAG","this is the error",e);
    }
    Log.i("Result is",result);
}}

public类MainActivity扩展了AppCompatActivity{
公共类下载页扩展异步任务{
@凌驾
受保护的字符串doInBackground（字符串…URL）{
字符串结果=”；
网址；
HttpURLConnection-urlConnection=null；
试一试{
url=新url（url[0]）；
urlConnection=（HttpURLConnection）url.openConnection（）；
InputStream inside=urlConnection.getInputStream（）；
InputStreamReader reader=新的InputStreamReader（内部）；
int data=reader.read（）；
while（数据！=-1）{
当前字符=（字符）数据；
结果+=电流；
data=reader.read（）；
}
返回结果；
}捕获（例外e）{
Log.e（“这里是”，“错误”，e）；
}
返回“任务完成”；
}
}
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
downloadPage=新建downloadPage（）；
字符串结果=null；
试一试{
结果=第页。执行（“https://docs.python.org/3/）.get（）；
}捕获（例外e）{
Log.e（“标记”，“这是错误”，e）；
}
Log.i（“结果为”，结果）；
}}

虽然我得到了HTML，但是我的logcat中仍然有一些错误。给你-

10-12 19:11:18.101 16464-16464/? I/webcontentintr: Not late-enabling -Xcheck:jni (already on)
10-12 19:11:18.173 16464-16464/? I/webcontentintr: Unquickening 12 vdex files!
10-12 19:11:18.176 16464-16464/? W/webcontentintr: Unexpected CPU variant for X86 using defaults: x86
10-12 19:11:18.605 16464-16464/com.example.vaibhav.webcontentintro D/ApplicationLoaders: Returning zygote-cached class loader: /system/framework/android.test.base.jar
10-12 19:11:18.607 16464-16464/com.example.vaibhav.webcontentintro I/webcontentintr: The ClassLoaderContext is a special shared library.
10-12 19:11:19.021 16464-16464/com.example.vaibhav.webcontentintro W/webcontentintr: JIT profile information will not be recorded: profile file does not exist.
10-12 19:11:19.035 16464-16464/com.example.vaibhav.webcontentintro I/chatty: uid=10169(com.example.vaibhav.webcontentintro) identical 9 lines
10-12 19:11:19.035 16464-16464/com.example.vaibhav.webcontentintro W/webcontentintr: JIT profile information will not be recorded: profile file does not exist.
10-12 19:11:19.304 16464-16464/com.example.vaibhav.webcontentintro D/NetworkSecurityConfig: No Network Security Config specified, using platform default
10-12 19:11:19.308 16464-16464/com.example.vaibhav.webcontentintro D/NetworkSecurityConfig: No Network Security Config specified, using platform default
10-12 19:11:19.326 16464-16464/com.example.vaibhav.webcontentintro I/InstantRun: starting instant run server: is main process
10-12 19:11:19.741 16464-16499/com.example.vaibhav.webcontentintro D/libEGL: loaded /vendor/lib/egl/libEGL_emulation.so
10-12 19:11:19.847 16464-16499/com.example.vaibhav.webcontentintro D/libEGL: loaded /vendor/lib/egl/libGLESv1_CM_emulation.so
10-12 19:11:19.879 16464-16499/com.example.vaibhav.webcontentintro D/libEGL: loaded /vendor/lib/egl/libGLESv2_emulation.so
10-12 19:11:20.407 16464-16464/com.example.vaibhav.webcontentintro I/webcontentintr: IncrementDisableThreadFlip blocked for 7.872ms
10-12 19:11:20.455 16464-16464/com.example.vaibhav.webcontentintro I/webcontentintr: Waiting for a blocking GC ClassLinker
10-12 19:11:20.573 16464-16464/com.example.vaibhav.webcontentintro I/webcontentintr: WaitForGcToComplete blocked ClassLinker on ClassLinker for 117.552ms
10-12 19:11:20.574 16464-16464/com.example.vaibhav.webcontentintro W/webcontentintr: Verification of void android.support.v4.view.ViewCompat.addOnUnhandledKeyEventListener(android.view.View, android.support.v4.view.ViewCompat$OnUnhandledKeyEventListenerCompat) took 119.090ms (604.58 bytecodes/s) (1784B approximate peak alloc)
10-12 19:11:20.745 16464-16464/com.example.vaibhav.webcontentintro W/webcontentintr: Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (greylist, reflection, allowed)
10-12 19:11:20.748 16464-16464/com.example.vaibhav.webcontentintro W/webcontentintr: Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (greylist, reflection, allowed)
10-12 19:11:22.545 16464-16464/com.example.vaibhav.webcontentintro I/Result is: <html>
                                                                                <head><title>301 Moved Permanently</title></head>
                                                                                <body bgcolor="white">
                                                                                <center><h1>301 Moved Permanently</h1></center>
                                                                                <hr><center>nginx/1.14.0 (Ubuntu)</center>
                                                                                </body>
                                                                                </html>
10-12 19:11:22.678 16464-16464/com.example.vaibhav.webcontentintro V/StudioProfiler: StudioProfilers agent attached.
10-12 19:11:22.828 16464-16464/com.example.vaibhav.webcontentintro W/webcontentintr: DexFile /data/user/0/com.example.vaibhav.webcontentintro/perfa.jar is in boot class path but is not in a known location
10-12 19:11:22.843 16464-16540/com.example.vaibhav.webcontentintro V/StudioProfiler: Acquiring Application for Events
10-12 19:11:22.663 16464-16464/com.example.vaibhav.webcontentintro W/webcontentintro: type=1400 audit(0.0:705): avc: granted { execute } for path="/data/user/0/com.example.vaibhav.webcontentintro/libperfa_x86.so" dev="vdc" ino=131501 scontext=u:r:untrusted_app_27:s0:c512,c768 tcontext=u:object_r:app_data_file:s0:c512,c768 tclass=file app=com.example.vaibhav.webcontentintro
10-12 19:11:22.880 16464-16541/com.example.vaibhav.webcontentintro W/InputMethodManager: InputMethodManager.getInstance() is deprecated because it cannot be compatible with multi-display. Use context.getSystemService(InputMethodManager.class) instead.
                                                                                         java.lang.Throwable
                                                                                             at android.view.inputmethod.InputMethodManager.getInstance(InputMethodManager.java:1234)
                                                                                             at java.lang.reflect.Method.invoke(Native Method)
                                                                                             at com.android.tools.profiler.support.profilers.EventProfiler$InputConnectionHandler.run(EventProfiler.java:287)
                                                                                             at java.lang.Thread.run(Thread.java:923)
10-12 19:11:22.902 16464-16541/com.example.vaibhav.webcontentintro W/InputMethodManager: InputMethodManager.peekInstance() is deprecated because it cannot be compatible with multi-display. Use context.getSystemService(InputMethodManager.class) instead.
                                                                                         java.lang.Throwable
                                                                                             at android.view.inputmethod.InputMethodManager.peekInstance(InputMethodManager.java:1253)
                                                                                             at android.view.inputmethod.InputMethodManager.getInstance(InputMethodManager.java:1239)
                                                                                             at java.lang.reflect.Method.invoke(Native Method)
                                                                                             at com.android.tools.profiler.support.profilers.EventProfiler$InputConnectionHandler.run(EventProfiler.java:287)
                                                                                             at java.lang.Thread.run(Thread.java:923)
10-12 19:11:23.215 16464-16464/com.example.vaibhav.webcontentintro A/libc: Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 16464 (webcontentintro), pid 16464 (webcontentintro)

10-12 19:11:18.101 16464-16464/？I/webcontentintr:未延迟启用-Xcheck:jni（已启用）
10-12 19:11:18.173 16464-16464/? I/webcontentintr：取消12个vdex文件！
10-12 19:11:18.176 16464-16464/? W/webcontentintr:使用默认值的X86的意外CPU变量：X86
10-12 19:11:18.605 16464-16464/com.example.vaibhav.webcontentintro D/ApplicationLoaders:返回zygote缓存类加载器：/system/framework/android.test.base.jar
10-12 19:11:18.607 16464-16464/com.example.vaibhav.webcontentintro I/webcontentintr:ClassLoaderContext是一个特殊的共享库。
10-12 19:11:19.021 16464-16464/com.example.vaibhav.webcontentintro W/webcontentintr:将不记录JIT配置文件信息：配置文件不存在。
10-12 19:11:19.035 16464-16464/com.example.vaibhav.webcontentintro I/chatty:uid=10169（com.example.vaibhav.webcontentintro）相同的9行
10-12 19:11:19.035 16464-16464/com.example.vaibhav.webcontentintro W/webcontentintr:将不记录JIT配置文件信息：配置文件不存在。
10-12 19:11:19.304 16464-16464/com.example.vaibhav.webcontentintro D/NetworkSecurityConfig:未指定网络安全配置，使用平台默认值
10-12 19:11:19.308 16464-16464/com.example.vaibhav.webcontentintro D/NetworkSecurityConfig:未指定网络安全配置，使用平台默认值
10-12 19:11:19.326 16464-16464/com.example.vaibhav.webcontentintro I/InstantRun:启动即时运行服务器：是主进程
10-12 19:11:19.741 16464-16499/com.example.vaibhav.webcontentintro D/libEGL:loaded/vendor/lib/egl/libEGL_.so
10-12 19:11:19.847 16464-16499/com.example.vaibhav.webcontentintro D/libEGL:loaded/vendor/lib/egl/libGLESv1_CM_emulation.so
10-12 19:11:19.879 16464-16499/com.example.vaibhav.webcontentintro D/libEGL:loaded/vendor/lib/egl/libGLESv2_emulation.so
10-12 19:11:20.407 16464-16464/com.example.vaibhav.webcontentintro I/webcontentintr:IncrementDisableThreadFlip被阻止7.872ms
10-12 19:11:20.455 16464-16464/com.example.vaibhav.webcontentintro I/webcontentintr:正在等待阻止的GC类链接器
10-12 19:11:20.573 16464-16464/com.example.vaibhav.webcontentintro I/webcontentintr:WaitForgCTO在类链接器上完成阻止的类链接器117.552ms
10-12 19:11:20.574 16464-16464/com.example.vaibhav.webcontentintro W/webcontentintr:void android.support.v4.view.ViewCompat.addOnUnhandledKeyEventListener（android.view.view，android.support.v4.view.ViewCompat$OnUnhandledKeyEventListenerCompat）的验证耗时119.090ms（604.58字节码/秒）（1784B近似峰值分配）
10-12 19:11:20.745 16464-16464/com.example.vaibhav.webcontentintro W/webcontentintr:访问隐藏方法Landroid/view/view；->computeFitSystemWindows（Landroid/graphics/Rect；Landroid/graphics/Rect；）Z（灰色列表，允许反射）
10-12 19:11:20.748 16464-16464/com.example.vaibhav.webcontentintro W/webcontentintr:访问隐藏方法Landroid/view/ViewGroup；->makeOptionalFitsSystemWindows（）V（灰色列表，允许反射）
10-12 19:11:22.545 16464-16464/com.example.vaibhav.webcontentintro I/结果是：
301永久搬迁
301永久搬迁
nginx/1.14.0（Ubuntu）
10-12 19:11:22.678 16464-16464/com.example.vaibhav.webcontentintro V/StudioProfiler:StudioProfilers代理已附加。
10-12 19:11:22.828 16464-16464/com.example.vaibhav.webcontentintro W/webcontentintr:DexFile/data/user/0/com.example.vaibhav.webcontentintro/perfa.jar位于引导类路径中，但不在已知位置
10-12 19:11:22.843 16464-16540/com.example.vaibhav.webcontententintro V/StudioProfiler:获取事件应用程序
10-12 19:11: