eclipse开发rcp4用上log4j和splashscreen

好多年不用rcp了，现在偶然用一下，发现高版本eclipse不支持jdk8,好吧用上2020-06版本整一个小程序回顾一下例程

按照向导新建了rcp4例程，右键找到rcp1.product文件运行，可以。

想着加些打印日志吧，很自然想到用log4j，但是加个库折腾了好久，最后摸索出方法：

双击plugin.xml在编辑器里选build 加库那里选libs文件夹,最后得到配置文件build.properties

        source.. = src/
        output.. = bin/
        bin.includes = plugin.xml,
               meta-INF/,
               .,
               icons/,
               css/default.css,
               Application.e4xmi,
               libs
        jars.compile.order = .,
                             org.apache.log4j_1.2.15.v201012070815.jar
        jars.extra.classpath = libs/org.apache.log4j_1.2.15.v201012070815.jar
        source.libs = src/

双击plugin.xml在编辑器里runtime那里的classpath里增加libs及这个库，就是说需要得到库的全路径，得不到的话手动修改配置文件manifest.mf

        Bundle-ClassPath: .,
            libs/org.apache.log4j_1.2.15.v201012070815.jar

后来又想到以前的splashscreen效果，发现图形化里的好像是支持rcp3的，就自己建个界面展示一张图片，继承一下线程，过一段时间自动消失就好了。下面是启动这个界面放到自己主界面初始化里：

public void createComposite(Composite parent) {
		parent.setLayout(new GridLayout(1, false));
		//Display display = Display.getDefault();
		RcpSplash spl = new RcpSplash(parent.getDisplay());
		Thread th=new Thread(spl);
		th.start();	

但是很奇怪splash界面是黑色的没显示图片，折腾了很久发现是这个界面没激活，好吧，在初始化里增加一句激活即可

public class RcpSplash extends Shell  implements Runnable{
	private Integer iSleep=3000;//闪屏 时长
	//public Label c;
	
	public  void fillbg(Composite obj ,InputStream c) {//parent.setBackgroundImage(new Image(parent.getDisplay(),this.getClass().getResourceAsStream("/icons/bg.png")));
		final Image image=new Image(obj.getDisplay(),c);
		final int imgWidth = image.getBounds().width;
		final int imgHeight = image.getBounds().height;	
		obj.addPaintListener(new PaintListener() {
		      @Override    //jdk1.8需要 1.7不要
		      public void paintControl(PaintEvent event) {		        
		          event.gc.drawImage(image, 0, 0, imgWidth, imgHeight, 0, 0, event.width, event.height);
		     }
		});
	}
	
	public RcpSplash(Display display ) {
		super(display, SWT.NO_TRIM |SWT.TOP);fillbg(this.getShell(),this.getClass().getResourceAsStream("/icons/splash.png"));
		setSize(800, 600);
		setCenter(this);
		open();
		setActive();
	}
	
	@Override
	public void run() {
		try {
			Display.getDefault().syncExec(new Runnable() {
				public void run() {
					open();
					//layout();					
					try {
						Thread.sleep(iSleep);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
					closesplash();
				}
			});
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	public static void setCenter(Shell shl)
	{
		int width = shl.getMonitor().getClientArea().width;   
        int height = shl.getMonitor().getClientArea().height;   
         int x = shl.getSize().x;   
         int y = shl.getSize().y;   
         if(x > width)   
         {   
        	 shl.getSize().x = width;   
         }   
         if(y > height)   
         {   
        	 shl.getSize().y = height;   
         }   
         shl.setLocation((width - x) / 2, (height - y) / 2);   
	}

	@Override
	protected void checkSubclass () {   
		//这个空函数不可少   解除不被子类化
	}
	public Integer getiSleep() {
		return iSleep;
	}

	public void setiSleep(Integer iSleep) {
		this.iSleep = iSleep;
	}
	public void closesplash() {
		this.dispose();
	}
}