messagereader.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.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Field;
import java.net.URL;

import javax.mail.Message;
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.component.config.ConfigHelper;
import net.sf.pim.mail.MailUtil;
import net.sf.util.TousleUtil;

import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.PlatformUI;
/**
 * @author levin
 */
public class MessageReader extends FileMessageReader {
	//2007.12.17 判断是否已经读过的线程，一封邮件停留4秒计为已读
	class CheckReader extends Thread{
		private String messageKey;	//需要判断的邮件key
		public CheckReader(String messageKey) {
			this.messageKey = messageKey;
		}
		public void run() {
			try {
				Thread.sleep(1000*ConfigHelper.getIntegerProperty("mail.delayread"));
				//取当前folderviewer中选中邮件作比较
				Display.getDefault().asyncExec(new Runnable(){
					public void run() {
						try {
							FolderViewer folderViewer=(FolderViewer) PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().findView(FolderViewer.ID);
							if(folderViewer.getViewer().getSelection().isEmpty())
								return ;
							POP3Message message=(POP3Message) ((StructuredSelection)folderViewer.getViewer().getSelection()).getFirstElement();
							if(messageKey.equals(message.getInternalFileName()) && !FolderViewer.getReadSet().contains(messageKey)){
								FolderViewer.getReadSet().add(messageKey);
							}
							folderViewer.getViewer().refresh(message);
						} catch (Exception e) {
							e.printStackTrace();
						}
					}
				});

			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	public MessageReader(Composite parent, int style) {
		super(parent, style);
	}

	//取邮件体
	protected Object getMessageBody() throws MessagingException, IOException {
		if(messageShow instanceof POP3Message){
			//2007.10.13 抽取html进行展示，用双击附件文字进行mht的切换
			return MailUtil.dumpBodyHtml(messageShow);
		}
		return super.getMessageBody();
	}

	@Override
	public void showMessage(Message msg) throws MessagingException {
		super.showMessage(msg);
		String key= ((POP3Message) msg).getInternalFileName();
		//未读的邮件启动检查线程
		if(!FolderViewer.getReadSet().contains(key))
			new CheckReader(key).start();
	}

	@Override
	protected void attachClick() {
		//显示mht邮件
		body.setUrl(((URL)getInternalFileUrl()).toString());
	}
	
	private Object getInternalFileUrl() {
		//投机一下，直接用ie的mht规范显示邮件，先不考虑附件的优化
		//将邮件内容全部写一个后缀为mht的临时文件中，再展示
		try {
			String fileName=((POP3Message) messageShow).getInternalFileName();
			File messageFile=new File(System.getProperty("java.io.tmpdir", "c:/tmp/")+"/"+fileName+".mht");
			//还可以用一下缓存，呵呵
			if(!messageFile.exists()){
				Field field=POP3Folder.class.getDeclaredField("dataDirectory");
				field.setAccessible(true);
				File dataDirectory=(File) field.get(((POP3Message)messageShow).getFolder());
				TousleUtil.copyIntput2Output(new FileInputStream(new File(dataDirectory,fileName)), new FileOutputStream(messageFile));
			}
				return messageFile.toURL();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
}