juploadpanel.java

文件上传的java例子

package wjhk.jupload;

import java.io.File;

import java.awt.Container;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.Timer;

import wjhk.jupload.filepanel.FilePanelTableImp;

public class JUploadPanel extends JPanel implements ActionListener{

  //------------- INFORMATION --------------------------------------------
  public static final String TITLE = "JUpload JUploadPanel";
  public static final String DESCRIPTION =
      "Main Panel for JUpload Application/Applet.";
  public static final String AUTHOR = "William JinHua Kwong";

  public static final double VERSION = 1.3;
  public static final String LAST_MODIFIED = "14 February 2004";

  //------------- VARIABLES ----------------------------------------------
  public static final String DEFAULT_POST_URL = "http://localhost:8080/";

  //----------------------------------------------------------------------
  private String postURL = null;

  private JPanel topPanel;
  private JButton browse, remove, removeAll;
  private JFileChooser fileChooser = null;

  private FilePanel fp = null;

  private JPanel progressPanel;
  private JButton upload, stop;
  private JProgressBar progress = null;

  private JTextArea status = null;

  private AfterUploadSucc aus = null;

  private Timer timer;

  // Timeout at DEEFAULT_TIMEOUT milliseconds
  private final static int DEFAULT_TIMEOUT = 100;

  FileUploadThreadV2 fut;
  //------------- CONSTRUCTOR --------------------------------------------

  //Initialize the applet
  public JUploadPanel(String postURL,
                      JButton browse,
                      JButton remove,
                      JButton removeAll,
                      FilePanel fp,
                      JButton upload,
                      JProgressBar progress,
                      JButton stop,
                      JTextArea status,
                      JFileChooser fc) {

    this.setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));

    this.postURL = (null==postURL)?DEFAULT_POST_URL:postURL;

    // Setup Top Panel
    setupTopPanel(browse, remove, removeAll);

    // Setup File Panel.
    //this.fp = (null==fp)?new FilePanelImp(this):fp;
    this.fp = (null==fp)?new FilePanelTableImp(this):fp;
    this.add((Container)this.fp);

    // Setup Progress Panel.
    setupProgressPanel(upload, progress, stop);

    // Setup Status Area.
    setupStatus(status);

    // Setup File Chooser.
    if(null==fc){
      try{
        this.fileChooser = new JFileChooser();
        fileChooser.setCurrentDirectory(new File(System.getProperty("user.dir")));
        fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
        fileChooser.setMultiSelectionEnabled(true);
      }catch(Exception e){
        this.status.append("ERROR  : " + e.getMessage() + "\n");
      }
    }else{
      this.fileChooser = fc;
    }
  }

  //----------------------------------------------------------------------

  private void setupTopPanel(JButton jbBrowse, JButton jbRemove, JButton jbRemoveAll){
    topPanel = new JPanel();
    topPanel.setLayout(new GridLayout(1, 3));

    // -------- JButton browse --------
    if(null==jbBrowse){
      browse = new JButton("Browse...");
      browse.setIcon(new ImageIcon(getClass().getResource("/images/explorer.gif")));
    }else{
      browse = jbBrowse;
    }
    browse.addActionListener(this);
    topPanel.add(browse);

    // -------- JButton remove --------
    if(null==jbRemove){
      remove = new JButton("Remove Selected");
      remove.setIcon(new ImageIcon(getClass().getResource("/images/recycle.gif")));
    }else{
      remove = jbRemove;
    }
    remove.setEnabled(false);
    remove.addActionListener(this);
    topPanel.add(remove);

    // -------- JButton removeAll --------
    if(null==jbRemoveAll){
      removeAll = new JButton("Remove All");
      removeAll.setIcon(new ImageIcon(getClass().getResource("/images/cross.gif")));
    }else{
      removeAll = jbRemoveAll;
    }
    removeAll.setEnabled(false);
    removeAll.addActionListener(this);
    topPanel.add(removeAll);

    this.add(topPanel);
  }

  private void setupProgressPanel(JButton jbUpload, JProgressBar jpbProgress, JButton jbStop){
    progressPanel = new JPanel();
    progressPanel.setLayout(new BoxLayout(progressPanel, BoxLayout.X_AXIS));

    // -------- JButton upload --------
    if(null==jbUpload){
      upload = new JButton("Upload");
      upload.setIcon(new ImageIcon(getClass().getResource("/images/up.gif")));
    }else{
      upload = jbUpload;
    }
    upload.setEnabled(false);
    upload.addActionListener(this);
    progressPanel.add(upload);

    // -------- JProgressBar progress --------
    if(null == jpbProgress){
      progress = new JProgressBar(JProgressBar.HORIZONTAL);
      progress.setStringPainted(true);
    }else{
      progress = jpbProgress;
    }
    progressPanel.add(progress);

    // -------- JButton stop --------
    if(null==jbStop){
      stop = new JButton("STOP");
      stop.setIcon(new ImageIcon(getClass().getResource("/images/cross.gif")));
    }else{
      stop = jbStop;
    }
    stop.setEnabled(false);
    stop.addActionListener(this);
    progressPanel.add(stop);

    this.add(progressPanel);
  }

  private void setupStatus(JTextArea ta){
    // -------- JTextArea status --------
    if(null==ta){
      status = new StatusArea(5, 20);
    }else{
      status = ta;
    }

    JScrollPane pane = new JScrollPane();
    pane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    pane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

    pane.getViewport().add(status);
    this.add(pane);
  }

  //----------------------------------------------------------------------

  public void addDoAfterUploadSucc(AfterUploadSucc aus){
    if(null == aus){
      this.aus = new AfterUploadSuccImp();
    }else{
      this.aus = aus;
    }
    this.aus.setStatus(status);
  }

  //----------------------------------------------------------------------
  protected void addFiles(File[] f){
    fp.addFiles(f);
    if(0 < fp.getFilesLength()){
      remove.setEnabled(true);
      removeAll.setEnabled(true);
      upload.setEnabled(true);
    }
  }

  public void actionPerformed(ActionEvent e) {
    status.append("Action : " + e.getActionCommand() + "\n");
    if(e.getActionCommand() == browse.getActionCommand()){
      if(null!=fileChooser){
        try{
          if(JFileChooser.APPROVE_OPTION ==
            fileChooser.showOpenDialog(new Frame())){
            addFiles(fileChooser.getSelectedFiles());
          }
        }catch(Exception ex){
          status.append("ERROR  : " + ex.getMessage() + "\n");
        }
      }
    }else if(e.getActionCommand() == remove.getActionCommand()){
      fp.removeSelected();
      if(0 >= fp.getFilesLength()){
        remove.setEnabled(false);
        removeAll.setEnabled(false);
        upload.setEnabled(false);
      }
    }else if(e.getActionCommand() == removeAll.getActionCommand()){
      fp.removeAll();
      remove.setEnabled(false);
      removeAll.setEnabled(false);
      upload.setEnabled(false);
    }else if(e.getActionCommand() == upload.getActionCommand()){
      //status.append("POST URL = " + postURL + "\n");
      fut = new FileUploadThreadV2(fp.getFiles(), postURL);
      fut.setProgressPanel(progress);
      fut.start();

      browse.setEnabled(false);
      remove.setEnabled(false);
      removeAll.setEnabled(false);
      upload.setEnabled(false);
      stop.setEnabled(true);

      //Create a timer.
      timer = new Timer(DEFAULT_TIMEOUT, new ActionListener() {
        public void actionPerformed(ActionEvent evt) {
          if(!fut.isAlive()){
            timer.stop();
            boolean isSuccess = false;
            StringBuffer svrRet;

            if(null != fut.getException()){
              status.append("ERROR  : " + fut.getException().toString() + "\n");
            }else{
              status.append("INFO   : " + fp.getFilesLength() + " Files uploaded.\n");
              fp.removeAll();
              isSuccess = true;
            }
            svrRet = fut.getServerOutput();
            fut.close();
            fut = null;
            // Setting Progress bar to 0%.
            progress.setString(null);
            progress.setValue(0);
            // Do something (eg Redirect to another page for processing).
            if((null != aus) && isSuccess) aus.executeThis(svrRet);

            stop.setEnabled(false);
            if(!isSuccess){
              remove.setEnabled(true);
              removeAll.setEnabled(true);
              upload.setEnabled(true);
            }
            browse.setEnabled(true);
          }
        }
      });
      timer.start();
    }else if(e.getActionCommand() == stop.getActionCommand()){
      stop.setEnabled(false);
      if(null != timer){
        timer.stop();
      }
      timer = null;
      if(null != fut){
        if(fut.isAlive()){
          fut.stopUpload();
          try{
            fut.join(1000);
          }catch(InterruptedException ie){}
        }
        fut.close();
      }
      fut = null;
      remove.setEnabled(true);
      removeAll.setEnabled(true);
      upload.setEnabled(true);
      browse.setEnabled(true);
    }
  }
}