为什么SAX XML解析器速度太慢

Question

我已经使用webservice创建了一个xml文件并创建了一个ASYNC来下载，然后使用SAXXMLParser解析它。 但是这样做需要很长时间。目前我有2500行和10列数据。它需要约5分钟。这是非常不可接受的。 这里是我的代码

 public class AsyncStock extends AsyncTask<Void, Void, Void> { 
List<Stock> mystocks = null; 
Context mcontext; 
ProgressDialog pd; 
int x=0; 
public AsyncStock(Context context) { 
    super(); 
    this.mcontext = context; 
} 
@Override 
protected Void doInBackground(Void... arg0) { 
    // TODO Auto-generated method stub 

    try{ 
     URLConnection conn = new URL("http://192.168.1.2/mob2server.asmx/GetStock").openConnection(); 

     mystocks = SAXXMLParser.parse(conn.getInputStream()); 

    DatabaseHandlerStock dbc; 
    dbc=new DatabaseHandlerStock(mcontext); 
    String category, make, model, productcode, productname, smallimages, largeimages, description, mrp, unit, pkg; 
    for(Stock in :mystocks) 

     { 
     x++; 
      category=in.getCategory(); 
      make=in.getMake(); 
      model=in.getModel(); 
      productcode=in.getProductcode(); 
      productname=in.getProductname(); 
      smallimages=in.getSmallimages(); 
      largeimages=in.getLargeimages(); 
      description=in.getDescription(); 
      mrp=in.getMrp(); 
      unit=in.getUnit(); 
      pkg=in.getPkg(); 

      dbc.addContact(new Catalogue(category.replace("$","&"), make.replace("$","&"), model.replace("$","&"), productcode, productname.replace("$","&"), smallimages, largeimages, description.replace("$","&"), mrp, unit, pkg)); 
     } 
    dbc.close(); 
     } 
     catch (Exception e) 
     { 
      System.out.println(e.getMessage()); 
     } 
    return null; 
} 
@Override 
protected void onPostExecute(Void result) { 
    pd.cancel(); 
    Toast.makeText(mcontext, "Total " + x + " Models Imported!", Toast.LENGTH_LONG).show(); 
    super.onPostExecute(result); 


} 

@Override 
protected void onPreExecute() { 
    pd=new ProgressDialog(mcontext); 
    pd.setMessage("Please Wait. We are Downloading the New Catalogue..."); 
    pd.show(); 
    pd.setCancelable(false); 
    pd.setCanceledOnTouchOutside(false); 
    super.onPreExecute(); 
} 

}

这里是解析类

public class StockParse extends DefaultHandler { 

private List<Stock> stocks; 
private String tempVal; 
private Stock tempstock; 

public StockParse() { 
    stocks = new ArrayList<Stock>(); 
} 

public List<Stock> getStocks() { 
    return stocks; 
} 

// Event Handlers 
public void startElement(String uri, String localName, String qName, 
     Attributes attributes) throws SAXException { 
    // reset 
    tempVal = ""; 
    if (qName.equalsIgnoreCase("Table")) { 
     // create a new instance of employee 
     tempstock = new Stock(); 
    } 
} 

public void characters(char[] ch, int start, int length) 
     throws SAXException { 
// tempVal = new String(ch, start, length); 
    if(tempVal == null) 
     tempVal = new String(ch, start, length); 
     else 
      tempVal += new String(ch, start, length); 
} 

public void endElement(String uri, String localName, String qName) 
     throws SAXException { 
    if (qName.equalsIgnoreCase("Table")) 
    { 
     // add it to the list 
     stocks.add(tempstock); 
    } 
    else if (qName.equalsIgnoreCase("NAVIN")) 
    { 
     //tempstock.setCategory(tempVal); 
    } 
    else if (qName.equalsIgnoreCase("NKCATEGORY")) 
    { 
     tempstock.setCategory(tempVal); 
    } 
    else if (qName.equalsIgnoreCase("NKMAKE")) 
    { 
     tempstock.setMake(tempVal); 
    } 
    else if (qName.equalsIgnoreCase("NKMODEL")) 
    { 
     tempstock.setModel(tempVal); 
    } 
    else if (qName.equalsIgnoreCase("NKPRODUCTCODE")) 
    { 
     tempstock.setProductcode(tempVal); 
    } 
    else if (qName.equalsIgnoreCase("NKPRODUCTNAME")) 
    { 
     tempstock.setProductname(tempVal); 
    } 
    else if (qName.equalsIgnoreCase("NKSMALLIMAGES")) 
    { 
     tempstock.setSmallimages(tempVal); 
    } 
    else if (qName.equalsIgnoreCase("NKLARGEIMAGES")) 
    { 
     tempstock.setLargeimages(tempVal); 
    } 
    else if (qName.equalsIgnoreCase("NKDESCRIPTION")) 
    { 
     tempstock.setDescription(tempVal); 
    } 
    else if (qName.equalsIgnoreCase("NKMRP")) 
    { 
     tempstock.setMrp(tempVal); 
    } 
    else if (qName.equalsIgnoreCase("NKUNIT")) 
    { 
     tempstock.setUnit(tempVal); 
    } 
    else if (qName.equalsIgnoreCase("NKPKG")) 
    { 
     tempstock.setPkg(tempVal); 
    } 
} 

}

 class Stock 
     { 
    private String category, make, model, productcode, productname, smallimages, largeimages, description, mrp, unit, pkg; 

    public String getCategory() { 
    return category; 
} 


public void setCategory(String category) { 
    this.category = category; 
} 


public String getMake() { 
    return make; 
} 

public void setMake(String make) { 
    this.make = make; 
} 

public String getModel() { 
    return model; 
} 


public void setModel(String model) { 
    this.model = model; 
} 


public String getProductcode() { 
    return productcode; 
} 

public void setProductcode(String productcode) { 
    this.productcode = productcode; 
} 

public String getProductname() { 
    return productname; 
} 

public void setProductname(String productname) { 
    this.productname = productname; 
} 


public String getSmallimages() { 
    return smallimages; 
} 


public void setSmallimages(String smallimages) { 
    this.smallimages = smallimages; 
} 

public String getLargeimages() { 
    return largeimages; 
} 


public void setLargeimages(String largeimages) { 
    this.largeimages = largeimages; 
} 

public String getDescription() { 
    return description; 
} 


public void setDescription(String description) { 
    this.description = description; 
} 

public String getMrp() { 
    return mrp; 
} 

public void setMrp(String mrp) { 
    this.mrp = mrp; 
} 

public String getUnit() { 
    return unit; 
} 

public void setUnit(String unit) { 
    this.unit = unit; 
} 

public String getPkg() { 
    return pkg; 
} 

public void setPkg(String pkg) { 
    this.pkg = pkg; 
} 

请帮助我加快我的解析。因为我是新手。

Answer 1

JSON比xml弱。有一次，我尝试比较它们，并且我看到Json文件是不到xml文件的2倍