XML SAX Parsing

Question

Ich muss die Bestellsumme pro Kunde dieses XML-Datei Beispiel drucken.

<OrderID id="10248"> 
<CustomerID>VINET</CustomerID> 
<ProductName>Queso Cabrales</ProductName> 
<UnitPrice>14.0000</UnitPrice> 
<Quantity>12</Quantity> 
<Freight>32.3800</Freight> 
</OrderID> 
<OrderID id="10248"> 
<CustomerID>VINET</CustomerID> 
<ProductName>Singaporean Hokkien Fried Mee</ProductName> 
<UnitPrice>9.8000</UnitPrice> 
<Quantity>10</Quantity> 
<Freight>32.3800</Freight> 
</OrderID> 
<OrderID id="10248"> 
<CustomerID>VINET</CustomerID> 
<ProductName>Mozzarella di Giovanni</ProductName> 
<UnitPrice>34.8000</UnitPrice> 
<Quantity>5</Quantity> 
<Freight>32.3800</Freight> 
</OrderID> 
<OrderID id="10249"> 
<CustomerID>TOMSP</CustomerID> 
<ProductName>Tofu</ProductName> 
<UnitPrice>18.6000</UnitPrice> 
<Quantity>9</Quantity> 
<Freight>11.6100</Freight> 
</OrderID> 
<OrderID id="10249"> 
<CustomerID>TOMSP</CustomerID> 
<ProductName>Manjimup Dried Apples</ProductName> 
<UnitPrice>42.4000</UnitPrice> 
<Quantity>40</Quantity> 
<Freight>11.6100</Freight> 
</OrderID> 

Was würde Ich mag das Ergebnis so aussehen:

VINET: 537,14

TOMSP: 1886,62

usw.

Diese Summen aus Einzelpreis gemacht werden * Menge + Fracht, vorgeschlagen aus den Ergebnissen. Wenn ich Ihnen den Rest des XML gab, könnten Sie es besser sehen, aber um der Zeit willen habe ich es kleiner gemacht. Ich bekomme auch einen Fehler, ein Dezimalformat für diese drei Variablen und ich bin nicht sicher, warum.

public class DataProcessor2 extends DefaultHandler { 

    boolean unitPrice = false; 
    boolean collectCount = false; 
    boolean freight = false;; 
    boolean quantity = false; 
    boolean customer = false; 

    float currentCount = 0; 
    float totalCount = 0; 
    float unitPriceCount = 0; 
    float freightCount = 0; 
    float quantityCount = 0; 

    //unitprice, freight, quantity 

    public DataProcessor2(){ 
     super(); 
    } 

    public void startDocument() { 
     // TODO Auto-generated method stub 
     System.out.println("Order Totals Per Customer"); 
    } 

    public void endDocument() { 
     // TODO Auto-generated method stub 

     System.out.println("Document END"); 
    } 

    public void startElement(String namespaceUri, String localName, 
      String qualifiedName, Attributes attributes) { 

     DecimalFormat df = new DecimalFormat("0.00"); 
     df.setMaximumFractionDigits(2); 
     if (qualifiedName.equals("CustomerID")){ 
      customer = true; 
     } 
     if(qualifiedName.equals("UnitPrice")){ 
      unitPrice = true; 
      //unitPriceCount = Float.parseFloat((qualifiedName)); 
     } 
     if(qualifiedName.equalsIgnoreCase("Freight")){ 
      freight = true; 
      //freightCount = Float.parseFloat(df.format(qualifiedName)); 
     } 
     if(qualifiedName.equalsIgnoreCase("Quantity")){ 
      quantity = true; 
      //quantityCount = Float.parseFloat(df.format(qualifiedName)); 
     } 
     if(unitPrice & freight & quantity){ 
      collectCount = true; 
      //currentCount = unitPriceCount * quantityCount + freightCount; 
     } 

    } 
    public void endElement(String namespaceUri, String localName, 
      String qualifiedName, Attributes attributes) { 
     //System.out.println("End Element "+ qualifiedName); 
    } 
    public void characters (char[] ch, int start, int length) throws SAXException{ 

     if (customer) { 
      System.out.println(new String(ch, start, length)); 
      customer = false; 
      } 
     if(unitPrice){ 
      // System.out.println(new String(ch, start, length)); 
      unitPrice = false; 
     } 
     if(freight){ 
      //System.out.println(new String(ch, start, length)); 
      freight = false; 
     } 
     if(quantity){ 
      //System.out.println(new String(ch, start, length)); 
      quantity = false; 
     } 
     if(collectCount){ 
      //System.out.println("Amount"+new String(ch, start, length)); 
      collectCount = false; 
     } 
     if(unitPrice & freight & quantity){ 
       collectCount = true; 
       //currentCount = unitPriceCount * quantityCount + freightCount; 
      } 

    } 

} 

ERROR:

Exception in thread "main" java.lang.NumberFormatException: For input string: "UnitPrice" 
    at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043) 
    at sun.misc.FloatingDecimal.parseFloat(FloatingDecimal.java:122) 
    at java.lang.Float.parseFloat(Float.java:451) 
    at DataProcessor2.startElement(DataProcessor2.java:50) 
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:509) 
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:379) 
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2786) 
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606) 
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:117) 
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510) 
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848) 
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777) 
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141) 
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213) 
    at One.main(One.java:19) 

Answer 1

Unten ist der Code dies in VTD-XML zu tun

import com.ximpleware.*; 

public class xpathSearch { 
    private static double compute(VTDNav vn) throws VTDException{ 
     double d1=0,d2=0; 
     if (vn.toElement(VTDNav.NEXT_SIBLING,"UnitPrice")){ 
      int i=vn.getText(); 
      if (i!=-1) 
      d1 = vn.parseDouble(i); 
     } 
     if (vn.toElement(VTDNav.NEXT_SIBLING,"Quantity")){ 
      int i=vn.getText(); 
      if (i!=-1) 
      d2 = vn.parseDouble(i); 
     } 
     return d1*d2; 
    } 
    public static void main(String s[])throws VTDException{ 
     VTDGen vg = new VTDGen(); 
     if (!vg.parseFile("d:\\xml\\input2.txt", false)) 
       return; 
     VTDNav vn = vg.getNav(); 
     AutoPilot ap = new AutoPilot(vn); 
     ap.selectXPath("/root/OrderID"); 
     int i; 
     double p1=0,p2 = 0; 
     while ((i=ap.evalXPath())!=-1){ 
      if (vn.toElement(VTDNav.FIRST_CHILD,"CustomerID")){ 
       i = vn.getText(); 
       if (i!=-1) { 
        if(vn.matchTokenString(i, "TOMSP")){ 
         p1 += compute(vn); 
        } 
        else if (vn.matchTokenString(i, "VINET")){ 

         p2 += compute(vn); 
        } 
       } 
       vn.toElement(VTDNav.P); 
      } 
     } 

     System.out.println(" TOMSP "+p1); 
     System.out.println(" VINET "+p2); 

    } 
}