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West Farmer — Sat, 31 Mar 2018 16:19:00 GMT

天天冒出一堆新的东西！让�h不知所措�?br />
举个例子�Q�jquery - angular - react - vue

�q�语�a�真的有毒�?br />
如今的硬�Ӟ��恐怕在��览器中实现强类型语�a�JAVA来作��本语�a�都不比JS弱吧�Q�哎真替applet感到冤枉�?br />
老夫一直就觉得�Q�浏览器一直是一个很奇葩的东西，HTML+CSS+JS本��n�Q�难道不能发明一�U�语�a�通过HTTP传输�Q�然后直接调用OS�U�别的UI来渲染不��完了吗�Q?br />
�|�页能实现的界面�Q�我不信用操作系�l�的UI�l��g做不出来�?img src ="http://www.tkk7.com/fredcn/aggbug/433139.html" width = "1" height = "1" />

West Farmer 2018-04-01 00:19 发表评论

West Farmer — Thu, 28 Nov 2013 01:38:00 GMT

原文地址�Q?a >https://weblogs.java.net/blog/pat/archive/2004/10/stupid_scanner_1.html

正则表达式中�Q?span style="color: red;">\A是指一个字�W�串的开��_��可能大家用惯�?span style="color: red;">^�Q�而忽略了�q�个\A�Q?/span> 但是^其实是指一行的开始，而不��一个字�W�串里面包含多少行，\A都只匚w��W�一行的开头�?br />那么我们可以�?/span>\A做点什么呢�Q�，看下面这个例子：

static String convertStreamToString(java.io.InputStream is) {
java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\\A");
return s.hasNext() ? s.next() : "";
}

�怿�大家都看懂了�Q�用\A作�ؓ分隔�W�，那么得到的当然就只有一个token�Q�那��是整个字符串了。再配合Scanner�Q�就��L��的将一个输入流转换��Z��个字�W�串了�?br />注意当需要做�~�码转换�Ӟ��Scanner是有支持�~�码参数的构造方法的�?a >

West Farmer 2013-11-28 09:38 发表评论

Extend Gson to support field level custom conversion

West Farmer — Fri, 22 Nov 2013 11:22:00 GMT

摘要: Gson is library created by google guys, it is used for java bean to json serialization/deserialization. Gson can serialize any java bean, collection, map to json, and don't need to care about the... 阅读全文

West Farmer 2013-11-22 19:22 发表评论

Be very careful when using data binding with SWT control.

West Farmer — Sun, 14 Apr 2013 07:24:00 GMT

If we observe a property of SWT controls, and bind it to another observable value, you must take care of those method calls which will change the property indirectly.
for example, we have a Combo whose "text" property is bound to a bean's "name" property like this:

IObservableValue nameObservable = BeansObservables.observeDetailValue(obserabedDriverProfile, "name", String.class);

ISWTObservableValue nameComboObservable = SWTObservables.observeText(driverClassCombo);

bindingContext.bindValue(nameComboObservable , nameObservable, new UpdateValueStrategy(UpdateValueStrategy.POLICY_UPDATE), null);

The variable "obserabedDriverProfile" is a observed selection in a ListViewer, it's in a master-detail scenario. If we add some code like this:

obserabedDriverProfile.addValueChangeListener(new IValueChangeListener(){

            @Override
            public void handleValueChange(ValueChangeEvent event) {
                DriverProfile dp = (DriverProfile)event.diff.getNewValue();
                driverClassCombo.removeAll();
                driverClassCombo.add(dp.getName();
                driverClassCombo.setText(driverClassCombo.getItem(0));
            }

        });

every time you change the selection in the ListViewer, the selected bean's "name" property will be set to a empty string. Why? The removeAll method of Combo will clear it's text, and combo's "text" property is bound to selected bean's "name" property. So, the right way is:

obserabedDriverProfile.addValueChangeListener(new IValueChangeListener(){

            @Override
            public void handleValueChange(ValueChangeEvent event) {
                DriverProfile dp = (DriverProfile)event.diff.getNewValue();
                String name = dp.getName;
                driverClassCombo.removeAll();
                driverClassCombo.add(name);
                driverClassCombo.setText(driverClassCombo.getItem(0));
            }

        });

West Farmer 2013-04-14 15:24 发表评论

Eclipse plugin secrets: Tips on IExecutableExtension

West Farmer — Sun, 15 Apr 2012 08:33:00 GMT

本文用英文写的，主要是考虑到本文分享的内容即��在google上也搜烦不到�Q�至��我是没有搜索到�Q��?br />
My English is at a very low level, don't care about this fact, just focus on the idea shared here.

The idea comes from the source code of ConfigurationElement which is located in package org.eclipse.core.internal.registry, If you read through the source code, you can also get it. But I found there is no documentation about this topic, so I wrote this.

Sometimes we need to contribute java class to a extension point. And we can use ConfigurationElement#
createExecutableExtension(String attributeName) to create an instance of it, if such a class is just a normal class, eclipse will call class#newInstance(). But there is obvious restriction for using this approach, can't pass parameter in to create instance for example.

There are three different way how eclipse create instance of your class.

normal, call class#newInstance()
if your calss implements IExecutableExtension interface, IExecutableExtension#setInitializationData(IConfigurationElement config, String propertyName, Object data) will be called on the instance returned by class#newInstance()
if your calss implements IExecutableExtensionFactory interface, IExecutableExtensionFactory#create() will be called

When you use the second method or the third method, you can pass in parameters, check the source code of ConfigurationElement, you will know how to do that. :D forgive me, I'm lazy.

West Farmer 2012-04-15 16:33 发表评论

West Farmer — Thu, 05 Apr 2012 15:46:00 GMT

SWT的Table不够强大�Q�而且��g��有严重的性能问题。（貌似是调用OS的实玎ͼ�但是在win7上面跑却非常慢，奇特�Q�本地的性能不如虚拟��Z��跑的Swing�Q?br />
好在SWT中可以嵌入AWT�?br />
反正本�h以前没有�q�多Swing的经验，但是在试玩了JTable之后发现��实很强大�?br />
对于有兴��的读者可以试一下，本文��分享如何��得JTable与JFace Data Binding Framework(下文中简�U�JDBF)一起协同工作�?br />
通常像Table和List�q�种UI�l��g�Q�展现的都是一个对象集合。JDBF 则�ؓ我们处理对象集合和UI界面的同步的问题。以List��Z��子，在Java中有java.util.List�Q�而JFDB则提供了相应�?br />

ObservableList�c�，�q�个�c�Wrap一个java.util.List�Q�当你对其进行增删改�Ӟ��与其�l�定的UI�l��g会自动得到同步。但是ObservableList 的实现有个很大的问题��是对其的访问只限于其所属的Realm�Q�这个Realm说白了就是SWT的UI�U�程�Q�而当我们在SWT中嵌入AWT�Ӟ��其中的AWT界面是跑在其自��n的线�E�里面的。所以想要让JTable与JFace Data Binding Framework(下文中简�U�JDBF)一起协同工作还要解军_��U�程的问题。废话不多说了，直接上菜�Q?br />
public class DOTableModel extends AbstractTableModel {

    /**
     * the ObservableList instance  to be shared with
     */
    private ObservableList list;

    private volatile  Integer  rowCount = null;

    private volatile DOModel object;;

    private  final Object lock = new Object();

    private static final long serialVersionUID = -8377145381412656796L;

    public DOTableModel(ObservableList list){
        this.list = list;
        this.list.addListChangeListener(new IListChangeListener(){
            @Override
            public void handleListChange(ListChangeEvent event) {
                for(ListDiffEntry de : event.diff.getDifferences()){
                    if(de.isAddition()){
                        DOTableModel.this.fireTableRowsInserted(de.getPosition(), de.getPosition());
                    }else{
                        DOTableModel.this.fireTableRowsDeleted(de.getPosition(), de.getPosition());
                    }
                }
            }
        });
    }

    @Override
    public int getRowCount() {
        list.getRealm().exec(new Runnable(){
            @Override
            public  void run() {
                rowCount = list.size();
                synchronized (lock) {
                    lock.notify();
                 }
            }
        });
        synchronized (lock) {
            while(rowCount == null){
                try {
                    lock.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
         }
        return rowCount;
    }

    @Override
    public int getColumnCount() {
        return 11;
    }

    private void getObjectFromSWTRealm(final int rowIndex){
        object =  null;
        list.getRealm().exec(new Runnable(){
            @Override
            public synchronized void run() {
                object = (DOModel) list.get(rowIndex);
                synchronized (lock) {
                    lock.notify();
                 }
            }
        });
        synchronized (lock) {
            while(object == null){
                try {
                    lock.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
         }
    }

    @Override
    public Object getValueAt(final int rowIndex, int columnIndex) {
        getObjectFromSWTRealm(rowIndex);
...
    }

    @Override
    public void setValueAt(Object oValue, final int rowIndex, int columnIndex) {
  getObjectFromSWTRealm(rowIndex);
  ...
    }

    @Override
    public String getColumnName(int column) {
...
    }

    @Override
    public boolean isCellEditable(int rowIndex, int columnIndex) {
        return true;
    }



}

West Farmer 2012-04-05 23:46 发表评论

【�{】用Java写一首诗

West Farmer — Thu, 05 Apr 2012 15:25:00 GMT

class Java {

    Java Java;

    Java() {
        Java = Java(this);
    }

    Java(Java Java) {
        this.Java = Java;
    }

    Java Java() {
        return Java.this.Java;
    }

    Java Java(Java Java) {
        return new Java(Java);
    }

    public static void main(String[] args) {
        new Java().Java.Java().Java.Java();
    }

}

原文地址

West Farmer 2012-04-05 23:25 发表评论

West Farmer — Fri, 21 Oct 2011 09:05:00 GMT

public static void main(String[] args) throws IOException {
        File sourceFile = new File("c:\\java\\A.java");
        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
        System.out.println(System.getProperties().getProperty("java.class.path") + ";F:\\IndigoSpace\\ejp");
        compiler.run(null, null, null, "-cp", System.getProperties().getProperty("java.class.path") + ";F:\\IndigoSpace\\ejp", sourceFile.getPath());
        System.out.println(new File("c:\\java\\").toURI().toURL());
        URLClassLoader loader = new URLClassLoader(new URL[]{new File("c:\\java\\").toURI().toURL()});
        try {
            loader.loadClass("A");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

需要注意的是，上面的代码只有在JDK上才能运行，因�ؓJDK里面才有javac。而且在实际应用中�Q�你�q�要自己��package声明转换成文件目�?/span>�Q�否者装载类的时候就会找不到�?img src ="http://www.tkk7.com/fredcn/aggbug/361751.html" width = "1" height = "1" />

West Farmer 2011-10-21 17:05 发表评论

Java中鲜��Z�h知的功能

West Farmer — Wed, 12 Oct 2011 05:11:00 GMT

摘要: 原文地址�Q�http://stackoverflow.com/questions/15496/hidden-features-of-java我选择几个有趣的：1. Double Brace Initialization Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHi... 阅读全文

West Farmer 2011-10-12 13:11 发表评论

West Farmer — Wed, 12 Oct 2011 02:48:00 GMT

Important�Q�该�c�L��诸多不尽人意的地方，读者如果要用，误��行完善，但是臛_��值得一试�?br />原代码是一个老外写的在桌面右下角弹出消息提示的一个类�Q�我�q�行了改写�?br />��M��改进�Q�希望你能不吝分享�?br />

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Scrollable;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.wb.swt.SWTResourceManager;

/**
* ��h��淡入淡出效果且不需要用��L��d��闭的消息提示框�?br /> * @author ggfan@amarsoft
*
*/
public class Notifier {
    private static final int DISPLAY_TIME = 2000;

    private static final int FADE_TIMER = 50;

    private static final int FADE_IN_STEP = 30;

    private static final int FADE_OUT_STEP = 8;

    private static final int FINAL_ALPHA = 225;

    public static int DEFAULT_WIDTH = 150;

    public static  int DEFAULT_HEIGHT = 60;

    private static Color _titleFgColor = SWTResourceManager.getColor(40, 73, 97);

    private static Color _fgColor = _titleFgColor;

    private static Color _bgFgGradient = SWTResourceManager.getColor(226, 239, 249);

    private static Color _bgBgGradient = SWTResourceManager.getColor(177, 211, 243);

    private static Color _borderColor = SWTResourceManager.getColor(40, 73, 97);

    private static Image _oldImage;
    // TODO Scrollable可能不合�?/span>
    public static void notify(Scrollable scrollable, final String msg) {

        final Shell parentShell = scrollable.getShell();
        final Shell newShell = new Shell(parentShell, SWT.NO_FOCUS | SWT.NO_TRIM);
        newShell.setLayout(new FillLayout());
        newShell.setForeground(_fgColor);
        newShell.setBackground(_bgBgGradient);
        newShell.setBackgroundMode(SWT.INHERIT_FORCE);
  scrollable.addDisposeListener(new DisposeListener(){

public void widgetDisposed(DisposeEvent e) {

newShell.dispose();

}

});

        final Composite inner = new Composite(newShell, SWT.NONE);
        FillLayout layout = new FillLayout();
        layout.marginWidth = 20;
        layout.marginHeight = 20;
        inner.setLayout(layout);

        newShell.addListener(SWT.Resize, new Listener() {
            public void handleEvent(Event event) {
                try {
                    Rectangle rect = newShell.getClientArea();
                    Image newImage = new Image(Display.getDefault(), Math.max(1, rect.width), rect.height);
                    GC gc = new GC(newImage);
                    // 背景
                    gc.setForeground(_bgFgGradient);
                    gc.setBackground(_bgBgGradient);
                    gc.fillGradientRectangle(rect.x, rect.y, rect.width, rect.height, true);
                    // �Ҏ��
                    gc.setLineWidth(2);
                    gc.setForeground(_borderColor);
                    gc.drawRectangle(rect.x + 1, rect.y + 1, rect.width - 2, rect.height - 2);

                    gc.dispose();
                    newShell.setBackgroundImage(newImage);
                    if (_oldImage != null) {
                        _oldImage.dispose();
                    }
                    _oldImage = newImage;
                } catch (Exception err) {
                    err.printStackTrace();
                }
            }
        });

        Label text = new Label(inner, SWT.WRAP | SWT.CENTER);
        Font tf = text.getFont();
        FontData tfd = tf.getFontData()[0];
        tfd.setStyle(SWT.BOLD);
        tfd.height = 8;
        text.setFont(SWTResourceManager.getFont(tfd.getName(), 8, SWT.NORMAL));
        text.setForeground(_fgColor);
        text.setText(msg);

        newShell.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

        if (Display.getDefault().getActiveShell() == null || Display.getDefault().getActiveShell().getMonitor() == null) {
            return;
        }
        newShell.setLocation(computePoint(scrollable));
        newShell.setAlpha(0);
        newShell.setVisible(true);

        fadeIn(newShell);
    }

    // TODO 当有滚动条出现的时候是否能够居中？
    private static Point computePoint(Scrollable scrollable) {
        Point p = scrollable.toDisplay(scrollable.getClientArea().x, scrollable.getClientArea().y);
        int w = scrollable.getClientArea().width;
        int h = scrollable.getClientArea().height;
        p.x += w / 2 - DEFAULT_WIDTH / 2 ;
        p.y += h / 2 - DEFAULT_HEIGHT / 2;
        return p;
    }

    private static void fadeIn(final Shell _shell) {
        Runnable run = new Runnable() {
            @Override
            public void run() {
                try {
                    if (_shell == null || _shell.isDisposed()) {
                        return;
                    }

                    int cur = _shell.getAlpha();
                    cur += FADE_IN_STEP;

                    if (cur > FINAL_ALPHA) {
                        _shell.setAlpha(FINAL_ALPHA);
                        startTimer(_shell);
                        return;
                    }

                    _shell.setAlpha(cur);
                    Display.getDefault().timerExec(FADE_TIMER, this);
                } catch (Exception err) {
                    err.printStackTrace();
                }
            }
        };
        Display.getDefault().timerExec(FADE_TIMER, run);
    }

    private static void startTimer(final Shell _shell) {
        Runnable run = new Runnable() {

            @Override
            public void run() {
                try {
                    if (_shell == null || _shell.isDisposed()) {
                        return;
                    }

                    fadeOut(_shell);
                } catch (Exception err) {
                    err.printStackTrace();
                }
            }

        };
        Display.getDefault().timerExec(DISPLAY_TIME, run);

    }

    private static void fadeOut(final Shell _shell) {
        final Runnable run = new Runnable() {

            @Override
            public void run() {
                try {
                    if (_shell == null || _shell.isDisposed()) {
                        return;
                    }

                    int cur = _shell.getAlpha();
                    cur -= FADE_OUT_STEP;

                    if (cur <= 0) {
                        _shell.setAlpha(0);
                         if (_oldImage != null) {
                             _oldImage.dispose();
                         }
                        _shell.dispose();
                        return;
                    }

                    _shell.setAlpha(cur);

                    Display.getDefault().timerExec(FADE_TIMER, this);

                } catch (Exception err) {
                    err.printStackTrace();
                }
            }

        };
        Display.getDefault().timerExec(FADE_TIMER, run);

    }
}

West Farmer 2011-10-12 10:48 发表评论