JAVA操縱XML

 

public class WmsConfigure ...{
    private String fileName = "configure.xml";
    
    //name指XML中需查找的節點名，index指如果XML裏有多個以name爲名的節點，需查找節點的位置，attribute指需查找的屬性名
    /**//** Creates a new instance of WmsConfigure */
    public WmsConfigure() ...{
    }
    
    public WmsConfigure(String fileName) ...{
        this.fileName = fileName;
    }
    
    public String getValue(String name,String attribute)...{
        return this.getValue(name,0,attribute);
    }
    
    public boolean setValue(String name,String attribute,String value)...{
        return this.setValue(name,0,attribute,value);
    }
    
    //獲取fileName文件中，第index個name元素的attribute屬性的值
    public String getValue(String name,int index,String attribute)...{
        try ...{
            DocumentBuilderFactory docBF=DocumentBuilderFactory.newInstance();
            DocumentBuilder docB = docBF.newDocumentBuilder();
            Document doc=docB.parse(new File(fileName));
            String value=((Element)doc.getElementsByTagName(name).item(index)).getAttribute(attribute);
            if(value.equals(""))
                return null;
            return value;
        } catch (ParserConfigurationException ex) ...{
            ex.printStackTrace();
        } catch (SAXException ex) ...{
            ex.printStackTrace();
        } catch (IOException ex) ...{
            ex.printStackTrace();
        }
        JOptionPane.showMessageDialog(JWmsMainFrame.thisFrame,"獲取"+name+"發生異常");
        return null;
    }
    
    //設置fileName文件中，第index個name元素的attribute屬性的值爲value
    public boolean setValue(String name,int index,String attribute,String value)...{
        Document doc=null;
        //將值寫入Document
        try ...{
            DocumentBuilderFactory docBF=DocumentBuilderFactory.newInstance();
            DocumentBuilder docB = docBF.newDocumentBuilder();
            doc=docB.parse(new File(fileName));
            ((Element)doc.getElementsByTagName(name).item(index)).setAttribute(attribute,value);
        }catch (ParserConfigurationException ex) ...{
            ex.printStackTrace();
            JOptionPane.showMessageDialog(JWmsMainFrame.thisFrame,"設置"+name+"發生異常");
        }catch (SAXException ex) ...{
            ex.printStackTrace();
            JOptionPane.showMessageDialog(JWmsMainFrame.thisFrame,"設置"+name+"發生異常");
        } catch (IOException ex) ...{
            ex.printStackTrace();
            JOptionPane.showMessageDialog(JWmsMainFrame.thisFrame,"設置"+name+"發生異常");
        }
        
        //將修改後的Document寫回到XML文件
        try ...{
            TransformerFactory tff = TransformerFactory.newInstance();
            Transformer tf=null;
            tf = tff.newTransformer();
            tf.transform(new DOMSource(doc),new StreamResult(new File(fileName)));
            return true;
        }catch (TransformerConfigurationException ex) ...{
            ex.printStackTrace();
            JOptionPane.showMessageDialog(JWmsMainFrame.thisFrame,"設置"+name+"發生異常");
        }catch (TransformerException ex) ...{
            ex.printStackTrace();
            JOptionPane.showMessageDialog(JWmsMainFrame.thisFrame,"設置"+name+"發生異常");
        }
        return false;
    }
    
}