HTMLcleaner堆栈跟踪错误

Question

我正在处理项目并遇到问题。我想使用html清理器解析html，然后使用xpath返回一个字符串。如果它发现一个错误（它做了），我让它返回一个堆栈跟踪。我真的不知道如何根据堆栈跟踪来调试它。这是代码。

package ru.habrahabr.stackparser; 

import java.net.URL; 
import java.util.ArrayList; 
import java.util.Iterator; 
import java.util.List; 

import org.htmlcleaner.TagNode; 

import android.app.Activity; 
import android.app.ProgressDialog; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.*; 

public class stackParser extends Activity { 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    Button button = (Button) findViewById(R.id.parse); 
    button.setOnClickListener(myListener); 
} 


private ProgressDialog pd; 

private OnClickListener myListener = new OnClickListener() { 
    public void onClick(View v) { 
     pd = ProgressDialog.show(stackParser.this, "Working...", 
       "request to server", true, false); 
     new parseSite() 
       .execute("http://wiki.teamliquid.net/starcraft2/3_Gate_Robo"); 
    } 
}; 

private class parseSite extends AsyncTask<String, Void, String> { 
    protected String doInBackground(String... arg) { 
     String output = new String(); 
     try { 
      htmlHelper hh = new htmlHelper(new URL(arg[0])); 
      output = hh.htmlHelper(arg[0]); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     return output; 
    } 


    protected void onPostExecute(String output) { 
     pd.dismiss(); 
     TextView view = (TextView) findViewById(R.id.tv1); 
     view.setText(output); 

    } 
} 

这里是我的HTML辅助类

package ru.habrahabr.stackparser; 

import java.io.IOException; 
import java.net.URL; 
import java.util.ArrayList; 
import java.util.List; 

import org.htmlcleaner.CleanerProperties; 
import org.htmlcleaner.HtmlCleaner; 
import org.htmlcleaner.TagNode; 
import org.htmlcleaner.XPatherException; 

public class htmlHelper { 
TagNode rootNode; 

public htmlHelper(URL url) { 
    // TODO Auto-generated constructor stub 
} 

public String htmlHelper(String arg) throws IOException, XPatherException 
{ 
    CleanerProperties props = new CleanerProperties(); 

    // set some properties to non-default values 
    props.setTranslateSpecialEntities(true); 
    props.setTransResCharsToNCR(true); 
    props.setOmitComments(true); 

    HtmlCleaner cleaner = new HtmlCleaner(props); 
    rootNode = cleaner.clean(arg); 

    Object[] nodes = rootNode.evaluateXPath("//h1[@id='firstHeading']"); 

    String things = nodes.toString(); 

    return things; 
} 

的UI和加载栏做工精细，但TextView的不断返回[Ljava.lang.Object; @ 42455a88

我会很感激一些帮助这个......我整天都在摔跤，似乎无法弄清楚。谢谢！

Answer 1

我想通了。 Xpath查询引用了XML文档中的DOM树。所以，为了避免抛出，DOM树需要在清理后初始化。然后Xpath将工作。

Answer 2

尝试为从TagNode阅读文本：

Object[] nodes = rootNode.evaluateXPath("//h1[@id='firstHeading']"); 
if(nodes == null || nodes.length < 1) { 
    return ""; 
} 

TagNode tagnode = (TagNode)nodes[0]; 
String things = tagnode.getText();