使用Jsoup从url获取数据时停止工作错误-Java 学习之路

我是android编程的业余爱好者 . 我正在使用Jsoup从网站获取html并将其放入textview但我收到错误 . 我怎样才能解决这个问题？

My code:

package com.example.hashtag.asdasd;

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.select.Elements;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    Document siteDoc;
    String a;
    Elements p;

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

        Button btn= (Button) findViewById(R.id.button);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                new siteGetter().execute();
            }
        });
    }

    private class siteGetter extends AsyncTask < Void, Void, String>{

        @Override
        protected String doInBackground(Void... voids) {
            try {
                siteDoc = Jsoup.connect("http://hashtagedu.ir").get();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
            return null;
        }
    }

    public void displaydata(){
        p = siteDoc.getElementsByTag("p");
        a=p.text();
        TextView tv= (TextView) findViewById(R.id.textView);
        tv.setText(a);
    }
}

My Errors:

java.lang.RuntimeException：在java.util.concurrent.FutureTask.finishCompletion（FutureTask.java:354）上的android.os.AsyncTask $ 3.done（AsyncTask.java：309）上执行doInBackground（）时发生错误.util.concurrent.FutureTask.setException（FutureTask.java:223）at java.util.concurrent.FutureTask.run（FutureTask.java:242）at android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:234） at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1113）at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:588）at java.lang.Thread.run（Thread.java:818））引起：java.lang.SecurityException：在java.net.InetAddress.getAllByNameImpl（InetAddress.java:252）的java.net.InetAddress.lookupHostByName（InetAddress.java:464）上的权限被拒绝（缺少INTERNET权限？） .net.InetAddress.getAllByName（InetAddress.java:215）at com.android.okhttp.internal.Network $ 1.resolveInetAddresses（Network.java:29）at com.android.okhttp.internal.http.Route Selector.resetNextInetSocketAddress（RouteSelector.java:188）在com.android.okhttp.internal.http.RouteSelector.nextProxy（RouteSelector.java:157）在com.android.okhttp.internal.http.RouteSelector.next（RouteSelector.java： 100）com.android.okhttp.internal.http.HttpEngine.createNextConnection（HttpEngine.java:357）com.android.okhttp.internal.http.HttpEngine.nextConnection（HttpEngine.java:340）com.android.okhttp的com.android.okhttp.internal.http.HttpEngine.createNextConnection（HttpEngine.java:357） .internal.http.HttpEngine.connect（HttpEngine.java:330）at com.android.okhttp.internal.http.HttpEngine.sendRequest（HttpEngine.java:248）at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute （HttpURLConnectionImpl.java:437）在com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect（HttpURLConnectionImpl.java:114）在org.jsoup.helper.HttpConnection $ Response.execute（HttpConnection.java:563）的组织 . jsoup.helper.HttpConnection $ Response.execute（HttpConnection.java:540）org.jsoup.helper.HttpConnection.execute（HttpConnection.java:227）atg.jsoup.helper.HttpConnectio n.get（HttpConnection.java:216）在com.example.hashtag.asdasd.MainActivity $ siteGetter.doInBackground（MainActivity.java:46）在com.example.hashtag.asdasd.MainActivity $ siteGetter.doInBackground（MainActivity.java： 39）在android.os.AsyncTask $ 2.call（AsyncTask.java:295）at java.util.concurrent.FutureTask.run（FutureTask.java:237）at android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java）：234）java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1113）at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:588）at java.lang.Thread.run（Thread . java：818）引起：android.system.GaiException：android_getaddrinfo失败：在libcore.io.ForwardingOs.android_getaddrinfo（ForwardingOs.java:55）的libcore.io.Posix.android_getaddrinfo（Native Method）中，EAI_NODATA（没有与主机名关联的地址））java.net.InetAddress.getAllByName（InetAddress.java：451）at java.net.InetAddress.getAllByNameImpl（InetAddress.java:252）at java.net.InetAddress.getAllByName（ InetAddress.java:215）com.android.okhttp.internal.Network $ 1.resolveInetAddresses（Network.java:29）at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress（RouteSelector.java:188）at com . android.okhttp.internal.http.RouteSelector.nextProxy（RouteSelector.java:157）位于com.android.okhttp.internal.http的com.android.okhttp.internal.http.RouteSelector.next（RouteSelector.java:100） . HttpEngine.createNextConnection（HttpEngine.java:357）在com.android.okhttp.internal.http.HttpEngine.nextConnection（HttpEngine.java:340）在com.android.okhttp.internal.http.HttpEngine.connect（HttpEngine.java： 330）在com.android.okhttp.internal.http.HttpEngine.sendRequest（HttpEngine.java:248）在com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute（HttpURLConnectionImpl.java:437）在com.android.okhttp .internal.huc.HttpURLConnectionImpl.connect（HttpURLConnectionImpl.java:114）org.jsoup.helper.HttpConnection $ Response.execute（HttpConnection.java:563）at org.jsoup.helper.HttpConnection $ R esponse.execute（HttpConnection.java:540）atg.jsoup.helper.HttpConnection.execute（HttpConnection.java:227）atg.jsoup.helper.HttpConnection.get（HttpConnection.java:216）at com.example.hashtag .asdasd.MainActivity $ siteGetter.doInBackground（MainActivity.java:46）在com.example.hashtag.asdasd.MainActivity $ siteGetter.doInBackground（MainActivity.java:39）在android.os.AsyncTask $ 2.call（AsyncTask.java： 295）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor）的android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:234）的java.util.concurrent.FutureTask.run（FutureTask.java:237） . java：1113）java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:588）at java.lang.Thread.run（Thread.java:818）引起：android.system.ErrnoException：android_getaddrinfo失败：在java.net.InetAddress的libcore.io.ForwardingOs.android_getaddrinfo（ForwardingOs.java:55）上的libcore.io.Posix.android_getaddrinfo（本地方法）中的EACCES（权限被拒绝） .lookupHostByName（InetAddress.java:451）at java.net.InetAddress.getAllByNameImpl（InetAddress.java:252）at java.net.InetAddress.getAllByName（InetAddress.java:215）at com.android.okhttp.internal.Network $ 1 .resolveInetAddresses（Network.java:29）位于com.android.okhttp.internal.http.RouteSelector.nextProxy（RouteSelector.java:157）的com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress（RouteSelector.java:188））com.android.okhttp.internal.http.RouteSelector.next（RouteSelector.java:100）位于com.android.okhttp的com.android.okhttp.internal.http.HttpEngine.createNextConnection（HttpEngine.java:357）中的com.android.okhttp.internal.http.RouteSelector.next . internal.http.HttpEngine.nextConnection（HttpEngine.java:340）at com.android.okhttp.internal.http.HttpEngine.connect（HttpEngine.java:330）at at com.android.okhttp.internal.http.HttpEngine.sendRequest（HttpEngine.java:248）位于com.android.okhttp.internal的com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute（HttpURLConnectionImpl.java:437） . huc.HttpURLConnectionImpl.connect（HttpURLConnectionImpl.java:114）org.jsoup.helper.HttpConnection $ Response.execute（HttpConnection.java:563）at org.jsoup.helper.HttpConnection $ Response.execute（HttpConnection.java:540） at org.jsoup.helper.HttpConnection.execute（HttpConnection.java:227）atg.jsoup.helper.HttpConnection.get（HttpConnection.java:216）at com.example.hashtag.asdasd.MainActivity $ siteGetter.doInBackground（MainActivity） .java：46）at com.example.hashtag.asdasd.MainActivity $ siteGetter.doInBackground（MainActivity.java:39）at android.os.AsyncTask $ 2.call（AsyncTask.java:295）at java.util.concurrent.FutureTask .run（FutureTask.java:237）在android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:234）java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1113）at at Java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:588）at java.lang.Thread.run（Thread.java:818）

2 回答

3
您必须为清单添加Internet权限 .
```
<uses-permission android:name="android.permission.INTERNET" />
```
回复于 2024-04-27T22:12:44+08:00

除了设置权限 <uses-permission android:name="android.permission.INTERNET" /> 之外，您当前不会调用 displaydata() ，如果您从后台任务执行此操作，则应设置一个处理程序来调用ui线程上的更改：

public class MainActivity extends AppCompatActivity {

    Handler uiHandler = new Handler();

    Document siteDoc;
    String a;
    Elements p;

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

        Button btn= (Button) findViewById(R.id.button);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                new siteGetter().execute();
            }
        });

    }

    private class siteGetter extends AsyncTask < Void, Void, String>{

        @Override
        protected String doInBackground(Void... voids) {
            try {
                siteDoc = Jsoup.connect("http://hashtagedu.ir").get();
                displaydata();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
            return null;
        }
    }

    public void displaydata(){
        p = siteDoc.getElementsByTag("p");
        a=p.text();

        uiHandler.post(new Runnable() {
            @Override
            public void run() {
                TextView tv= (TextView) findViewById(R.id.textView);
                tv.setText(a);
            }
        });
    }
}

关于将下载的图像（在删除的问题中提出）添加到ImageView（假设id为 R.id.imageView ）

Bitmap bitmap;

public void displaydata(){
    p = siteDoc.getElementsByTag("p");
    a=p.text();
    String imageUrl = siteDoc.select("img").first().attr("abs:src");
    bitmap = BitmapFactory.decodeStream((InputStream)new URL(imageUrl).getContent());
    uiHandler.post(new Runnable() {
        @Override
        public void run() {
            TextView tv= (TextView) findViewById(R.id.textView);
            tv.setText(a);

            ImageView i = (ImageView)findViewById(R.id.imageView);
            i.setImageBitmap(bitmap);
        }
    });
}

回复于 2024-04-27T22:12:44+08:00

使用Jsoup从url获取数据时停止工作错误

2 回答

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