解析 HTML 表格并转换为 JSON 时出错

Question

doc = Jsoup.parse("<table><tr><td>Phone No</td><td>Officers</td></tr><tr><td>123456789</td><td>Csa</td></tr></table>");
try {
    for (Element table : doc.select("table")) {
        for (Element row : table.select("tr")) {
            Elements tds = row.select("td");
            String PhoneNo = tds.get(0).text();
            String Officers = tds.get(1).text();
            jsonObject.put("Phone No", PhoneNo);
            jsonObject.put("Officers", Officers);
        }
        list.put(jsonObject);
    }
} catch ( JSONException e) {
    e.printStackTrace();
}

这段代码完美运行，但是当我尝试以下代码时

doc = Jsoup.connect(url).get();

它抛出NetworkOnMainThreadException，然后我遵循以下解决方案“Parsing with jsoup throws error (NetworkOnMainThreadException)”并将我的代码放入AsyncTask它抛出java.lang.RuntimeException: An error occured while executing doInBackground()

这里是堆栈跟踪：

FATAL EXCEPTION: AsyncTask #1    Process: com.rams.amar.information, PID: 12076    java.lang.RuntimeException: An error occured while executing doInBackground()
    at android.os.AsyncTask$3.done(AsyncTask.java:304)
    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
    at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
    at java.util.concurrent.FutureTask.run(FutureTask.java:242)
    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
    at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1
    at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
    at java.util.ArrayList.get(ArrayList.java:308)
    at com.rams.amar.information.activities.ContactsActivity$MyTask.doInBackground(ContactsActivity.java:58)
    at com.rams.amar.information.activities.ContactsActivity$MyTask.doInBackground(ContactsActivity.java:41)
    at android.os.AsyncTask$2.call(AsyncTask.java:292)
    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
    at java.lang.Thread.run(Thread.java:818) 

这里是完整的代码：ContactsActivity.java

package com.rams.a.information.activities;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;
import android.widget.TextView;
import com.rams.a.information.R;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.IOException;

public class ContactsActivity extends AppCompatActivity {
    String url="http://www.uok.ac.in/contactus.html";

    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.nav_contacts);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        this.setTitle("Contacts");
        MyTask mT = new MyTask();
        mT.execute();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        if((item.getItemId() == android.R.id.home))
        {
            onBackPressed();
        }
        return super.onOptionsItemSelected(item);
    }

    private class MyTask extends AsyncTask<Void, Void, String> {
        Document doc;
        JSONObject jsonObject = new JSONObject();
        JSONArray list = new JSONArray();

        @Override
        protected String doInBackground(Void... params) {
            try {
                doc = Jsoup.connect(url).get();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                for (Element table : doc.select("table")) {
                    for (Element row : table.select("tr")) {
                        Elements tds = row.select("td");
                        String PhoneNo = tds.get(0).text();
                        String Officers = tds.get(1).text();
                        jsonObject.put("Phone No", PhoneNo);
                        jsonObject.put("Officers", Officers);
                    }
                    list.put(jsonObject);
                }
            } catch ( JSONException e) {
                e.printStackTrace();
            }
            return list.toString();//stringArray.toString();
        }

        @Override
        protected void onPostExecute(String result) {

                ((TextView)findViewById (R.id.textView3)).setText(result);
        }
    }
}

Answer 1

看起来您的 HTML 表格数据并不总是有两列。

尝试添加 if 语句。

for (Element table : doc.select("table")) {
    for (Element row : table.select("tr")) {
        Elements tds = row.select("td");
        JSONObject jsonObject = new JSONObject();

        if (tds.size() >= 2) {  // see here                
            jsonObject.put("Phone No", tds.get(0).text());
            jsonObject.put("Officers", tds.get(1).text());

            list.put(jsonObject);
        }
    }
}

Answer 2

请检查表格正文之前的内容中是否有任何附加标签，如 doctype 或 xml 声明等。

Answer 3

try {
     for (Element table : doc.select("table")) {
         for (Element row : table.select("tr")) {
             JSONObject jsonObject = new JSONObject();
             Elements tds = row.select("td");
             if(tds.size()==1){continue;} else{
                 String PhoneNo = tds.get(0).text();
                 String Officers = tds.get(1).text();
                 jsonObject.put("Phone No", PhoneNo);
                 jsonObject.put("Officers", Officers);
             }
             list.put(jsonObject);
         }
     }
} catch ( JSONException e) {
     e.printStackTrace();
}

此代码完美运行。

Answer 4

在您的活动 onCreate() 中写下以下代码

  StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
  StrictMode.setThreadPolicy(policy);