exportaction.java

mywork是rcp开发的很好的例子

package net.sf.pim.mail.reader;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Field;

import javax.mail.MessagingException;

import jp.gr.java_conf.roadster.net.pop.POP3Folder;
import jp.gr.java_conf.roadster.net.pop.POP3Message;
import net.sf.util.TousleUtil;

import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;

public class ExportAction extends Action implements IWorkbenchWindowActionDelegate {

	protected FolderViewer folderViewer;

	public void dispose() {
		
	}

	public void init(IWorkbenchWindow window) {
		folderViewer=(FolderViewer) window.getActivePage().findView(FolderViewer.ID);
	}

	public void run(IAction action) {
		if(folderViewer.getViewer().getSelection().isEmpty())
			return ;
		POP3Message message=(POP3Message) ((StructuredSelection)folderViewer.getViewer().getSelection()).getFirstElement();
		final FileDialog fd=new FileDialog(folderViewer.getViewer().getTable().getShell(),SWT.SAVE);
		fd.setText("导出邮件");
		String fileName=getExportFileName(message);
		fd.setFileName(fileName);
        fd.setFilterExtensions(new String[]{"*.eml"});
        fd.setFilterNames(new String[]{"邮件文件(*.eml)"});
		String fname=fd.open();
		if(fname != null){
			try {
				//提示是否覆盖
				if(!new File(fname).exists() || MessageDialog.openConfirm(fd.getParent(),"文件覆盖确认","邮件已经存在，是否覆盖?")){
					writeFile(message, fname);
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}

	//获取文件名
	private String getExportFileName(POP3Message message){
		try {
			return message.getSubject().replaceAll(":", "-")+".eml";
		} catch (MessagingException e) {
			return "导出邮件.eml";
		}
	}

	//写文件
	private void writeFile(POP3Message message, String fileName) throws NoSuchFieldException, IllegalAccessException, IOException,FileNotFoundException {
		Field field=POP3Folder.class.getDeclaredField("dataDirectory");
		field.setAccessible(true);
		File dataDirectory=(File) field.get(message.getFolder());
		TousleUtil.copyIntput2Output(new FileInputStream(new File(dataDirectory,message.getInternalFileName())), new FileOutputStream(fileName));
	}

	public void selectionChanged(IAction action, ISelection selection) {
		
	}


}