2016-07-08 12 views

答えて

0

これを表示する最も簡単な方法は、フォームBean(PJC)も作成することです。 それから、十分に大きいJTextPaneにそれを表示することができます。 これで、clobから32000文字の断片を与え、それらをBeanに渡す関数を作成できます。

package be.axi.oracle.forms.jpc; 

import java.awt.event.FocusEvent; 
import java.awt.event.FocusListener; 
import java.awt.event.KeyEvent; 
import java.awt.event.KeyListener; 
import javax.swing.JScrollPane; 
import javax.swing.JTextPane; 
import javax.swing.SwingUtilities; 
import javax.swing.UIManager; 
import javax.swing.text.BadLocationException; 
import oracle.forms.handler.IHandler; 
import oracle.forms.properties.ID; 
import oracle.forms.ui.CustomEvent; 
import oracle.forms.ui.VBean; 

/** 
    * A TextArea to get more than 64k texts 
    * @author Francois Degrelle 
    * @version 1.1 
    */ 

public class BigTextArea extends VBean implements FocusListener, KeyListener 
    { 
    private static final long serialVersionUID = 1L; 
    public final static ID ADDTEXT  = ID.registerProperty("ADD_TEXT"); 
    public final static ID VALUE  = ID.registerProperty("VALUE");  
    public final static ID SHOW   = ID.registerProperty("SHOW");   
    public final static ID CLEAR  = ID.registerProperty("CLEAR"); 
    public final static ID GETTEXT  = ID.registerProperty("GET_TEXT");  
    public final static ID GETLENGTH = ID.registerProperty("GET_LENGTH");   
    public final static ID pLostFocus = ID.registerProperty("BEAN_QUITTED"); 

    private IHandler m_handler; 
    private int iStart  = 0 ; 
    private int iChunk  = 8192 ; 
    private StringBuffer sb = new StringBuffer(); 
    protected JTextPane  jtp = new JTextPane(); 

    public BigTextArea() 
    { 
     super(); 
     try 
     { 
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
      SwingUtilities.updateComponentTreeUI(this); 
     } 
     catch (Exception ex) 
     { 
      ex.printStackTrace(); 
     }   
     JScrollPane ps = new JScrollPane(jtp); 
     ps.setBorder(null); 
     add(ps); 
     ps.setVisible(true); 
    } 


    public void init(IHandler handler) 
    { 
     m_handler = handler; 
     super.init(handler); 
     addFocusListener(this); 
     jtp.addFocusListener(this); 
     jtp.addKeyListener(this); 
    }  


    public boolean setProperty(ID property, Object value) 
    { 
     // 
     // add text to the TextArea 
     // 
     if (property == ADDTEXT) 
     { 
     sb.append(value.toString()) ; 
     printMemory(); 
     return true; 
     } 
     // 
     // display the whole text 
     // 
     else if(property == SHOW) 
     { 
     jtp.setText(sb.toString()); 
     jtp.setCaretPosition(0); 
     sb = new StringBuffer(); 
     System.gc(); 
     printMemory(); 
     return true ; 
     } 
     // 
     // clear the TextArea 
     // 
     else if(property == CLEAR) { 
     jtp.setText(""); 
     return true ; 
     } 
     else 
     { 
     return super.setProperty(property, value); 
     } 
    } 

    /*-----------------------------------* 
    * Get the result string from Forms * 
    *-----------------------------------*/ 
    public Object getProperty(ID pId) 
    { 
     // 
     // returns the text length 
     // 
     if (pId == GETLENGTH) 
     { 
     return "" + jtp.getText().length(); 
     } 
     // 
     // returns the chunks 
     // 
     else if (pId == GETTEXT) { 
      String s = "" ; 
      int iLen = jtp.getText().length() ; 
      while (iStart < iLen) 
      { 
      try{ 
       if(iStart+iChunk <= iLen) s = jtp.getText(iStart,iChunk); 
       else s = jtp.getText(iStart,iLen-iStart); 
       iStart += iChunk ; 
       return s ; 
      } 
      catch (BadLocationException ble) { ble.printStackTrace(); return ""; } 
      } 
      iStart = 0 ; 
      return "" ; 
     } 
     else 
     { 
     return super.getProperty(pId); 
     } 
    } // getProperty() 


    /*--------------------------* 
     * handle the focus events * 
     *--------------------------*/ 
    public void focusGained(FocusEvent e) 
     { 
      if (e.getComponent() == this) 
      { 
       // put the focus on the component 
       jtp.requestFocus(); 
      } 

      try 
      { 
       m_handler.setProperty(FOCUS_EVENT, e); 
      } 
      catch (Exception ex) 
      { 
      ; 
      } 
     } 

    public void focusLost(FocusEvent e) 
     {  
     CustomEvent ce = new CustomEvent(m_handler, pLostFocus); 
     dispatchCustomEvent(ce);   
     } 

    /*--------------------------* 
     * Handle the Key listener * 
     *--------------------------*/ 
    public void keyPressed(KeyEvent e) 
    { 
     /* 
     ** Allows TAB key to exit the item 
     ** and continue the standard Forms navigation 
     */ 
     if ((e.getKeyCode() == KeyEvent.VK_TAB)) 
     { 
      try 
      { 
       m_handler.setProperty(KEY_EVENT, e); 
      } 
      catch (Exception ex) 
      { 
      } 
     } 
    } 


    public void keyTyped(KeyEvent e) 
    { 
    } 

    public void keyReleased(KeyEvent e) 
    { 
    } 


    // utility to output the memory available 
    private void printMemory() { 
     System.out.println("Java memory in use = " 
     + (Runtime.getRuntime().totalMemory() 
     - Runtime.getRuntime().freeMemory())); 
    } 

    } 
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