Java实例开发01-02 文本阅读器

这次采用的是SWT开发的，利用了Jigloo插件

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知识点：

1.FileDialog

2.文件的读写

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package chapter01.sample02;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import org.eclipse.swt.SWT;import org.eclipse.swt.events.SelectionAdapter;import org.eclipse.swt.events.SelectionEvent;import org.eclipse.swt.graphics.Point;import org.eclipse.swt.graphics.Rectangle;import org.eclipse.swt.layout.FillLayout;import org.eclipse.swt.layout.FormAttachment;import org.eclipse.swt.layout.FormData;import org.eclipse.swt.layout.FormLayout;import org.eclipse.swt.widgets.Composite;import org.eclipse.swt.widgets.Display;import org.eclipse.swt.widgets.FileDialog;import org.eclipse.swt.widgets.Label;import org.eclipse.swt.widgets.Menu;import org.eclipse.swt.widgets.MenuItem;import org.eclipse.swt.widgets.Shell;import org.eclipse.swt.widgets.Text;import org.eclipse.swt.widgets.ToolBar;import org.eclipse.swt.widgets.ToolItem;import com.cloudgarden.resource.SWTResourceManager;/*** This code was edited or generated using CloudGarden's Jigloo* SWT/Swing GUI Builder, which is free for non-commercial* use. If Jigloo is being used commercially (ie, by a corporation,* company or business for any purpose whatever) then you* should purchase a license for each developer using Jigloo.* Please visit www.cloudgarden.com for details.* Use of Jigloo implies acceptance of these licensing terms.* A COMMERCIAL LICENSE HAS NOT BEEN PURCHASED FOR* THIS MACHINE, SO JIGLOO OR THIS CODE CANNOT BE USED* LEGALLY FOR ANY CORPORATE OR COMMERCIAL PURPOSE.*/public class FileReaderTool extends org.eclipse.swt.widgets.Composite {    private Menu menu1;    private Text text_file;    private ToolItem toolItem_save;    private ToolItem toolItem_edit;    private ToolItem toolItem_open;    private ToolBar toolBar1;    private MenuItem aboutMenuItem;    private MenuItem contentsMenuItem;    private Menu helpMenu;    private MenuItem helpMenuItem;    private MenuItem exitMenuItem;    private MenuItem closeFileMenuItem;    private MenuItem saveFileMenuItem;    private MenuItem newFileMenuItem;    private MenuItem openFileMenuItem;    private Menu fileMenu;    private MenuItem fileMenuItem;    {        //Register as a resource user - SWTResourceManager will        //handle the obtaining and disposing of resources        SWTResourceManager.registerResourceUser(this);    }    public FileReaderTool(Composite parent, int style) {        super(parent, style);        initGUI();    }        /**    * Initializes the GUI.    */    private void initGUI() {        try {            this.setSize(new org.eclipse.swt.graphics.Point(400,300));            this.setBackground(SWTResourceManager.getColor(192, 192, 192));            FormLayout thisLayout = new FormLayout();            this.setLayout(thisLayout);            this.setBackgroundImage(SWTResourceManager.getImage("img/jpg/8.jpg"));            {                text_file = new Text(this, SWT.MULTI | SWT.WRAP | SWT.V_SCROLL);                FormData text_fileLData = new FormData();                text_fileLData.width = 378;                text_fileLData.height = 257;                text_fileLData.left =  new FormAttachment(0, 1000, 0);                text_fileLData.top =  new FormAttachment(0, 1000, 43);                text_fileLData.right =  new FormAttachment(1000, 1000, 0);                text_fileLData.bottom =  new FormAttachment(1000, 1000, 0);                text_file.setLayoutData(text_fileLData);                text_file.setVisible(false);            }            {                toolBar1 = new ToolBar(this, SWT.HORIZONTAL | SWT.H_SCROLL);                FormData toolBar1LData = new FormData();                toolBar1LData.width = 400;                toolBar1LData.height = 43;                toolBar1LData.left =  new FormAttachment(0, 1000, 0);                toolBar1LData.top =  new FormAttachment(0, 1000, 0);                toolBar1LData.right =  new FormAttachment(1000, 1000, 0);                toolBar1.setLayoutData(toolBar1LData);                {                    toolItem_open = new ToolItem(toolBar1, SWT.NONE);                    toolItem_open.setImage(SWTResourceManager.getImage("img/png/New Document.png"));                    toolItem_open.addSelectionListener(new SelectionAdapter() {                        public void widgetSelected(SelectionEvent evt) {                            toolItem_openWidgetSelected(evt);                        }                    });                }                {                    toolItem_edit = new ToolItem(toolBar1, SWT.NONE);                    toolItem_edit.setImage(SWTResourceManager.getImage("img/png/Write Document.png"));                    toolItem_edit.addSelectionListener(new SelectionAdapter() {                        public void widgetSelected(SelectionEvent evt) {                            toolItem_editWidgetSelected(evt);                        }                    });                }                {                    toolItem_save = new ToolItem(toolBar1, SWT.NONE);                    toolItem_save.setImage(SWTResourceManager.getImage("img/png/Web Browser.png"));                    toolItem_save.addSelectionListener(new SelectionAdapter() {                        public void widgetSelected(SelectionEvent evt) {                            toolItem_saveWidgetSelected(evt);                        }                    });                }            }            {                menu1 = new Menu(getShell(), SWT.BAR);                getShell().setMenuBar(menu1);                {                    fileMenuItem = new MenuItem(menu1, SWT.CASCADE);                    fileMenuItem.setText("File");                    {                        fileMenu = new Menu(fileMenuItem);                        {                            openFileMenuItem = new MenuItem(fileMenu, SWT.CASCADE);                            openFileMenuItem.setText("Open");                        }                        {                            newFileMenuItem = new MenuItem(fileMenu, SWT.CASCADE);                            newFileMenuItem.setText("New");                        }                        {                            saveFileMenuItem = new MenuItem(fileMenu, SWT.CASCADE);                            saveFileMenuItem.setText("Save");                        }                        {                            closeFileMenuItem = new MenuItem(fileMenu, SWT.CASCADE);                            closeFileMenuItem.setText("Close");                        }                        {                            exitMenuItem = new MenuItem(fileMenu, SWT.CASCADE);                            exitMenuItem.setText("Exit");                        }                        fileMenuItem.setMenu(fileMenu);                    }                }                {                    helpMenuItem = new MenuItem(menu1, SWT.CASCADE);                    helpMenuItem.setText("Help");                    {                        helpMenu = new Menu(helpMenuItem);                        {                            contentsMenuItem = new MenuItem(helpMenu, SWT.CASCADE);                            contentsMenuItem.setText("Contents");                        }                        {                            aboutMenuItem = new MenuItem(helpMenu, SWT.CASCADE);                            aboutMenuItem.setText("About");                        }                        helpMenuItem.setMenu(helpMenu);                    }                }            }            this.layout();        } catch (Exception e) {            e.printStackTrace();        }    }        /**    * Auto-generated main method to display this     * org.eclipse.swt.widgets.Composite inside a new Shell.    */    public static void main(String[] args) {        Display display = Display.getDefault();        Shell shell = new Shell(display,SWT.SHELL_TRIM);        FileReaderTool inst = new FileReaderTool(shell, SWT.NULL);        Point size = inst.getSize();        shell.setLayout(new FillLayout());        shell.setImage(SWTResourceManager.getImage("img/ico/Bookmark.ico"));        shell.setText("\u6587\u672c\u9605\u8bfb\u5668");        shell.layout();        if(size.x == 0 && size.y == 0) {            inst.pack();            shell.pack();        } else {            Rectangle shellBounds = shell.computeTrim(0, 0, size.x, size.y);            shell.setSize(shellBounds.width, shellBounds.height);        }        shell.open();        while (!shell.isDisposed()) {            if (!display.readAndDispatch())                display.sleep();        }    }        private void toolItem_editWidgetSelected(SelectionEvent evt) {        FileDialog fileDialog = new FileDialog(getShell(), SWT.OPEN);        fileDialog.setText("Choose a file to read!");        String[] fileFilters = new String[]{"*.txt","*.java","*.doc"};        fileDialog.setFilterExtensions(fileFilters);        String select = fileDialog.open();        System.out.println(select);        StringBuffer sBuffer = new StringBuffer();        try {            FileReader fileReader = new FileReader(select);            BufferedReader bufferedReader = new BufferedReader(fileReader);            String string = bufferedReader.readLine();            while(string!=null){                sBuffer.append(string+"\n");                string = bufferedReader.readLine();            }            bufferedReader.close();            fileReader.close();        } catch (Exception e) {            e.printStackTrace();        }        text_file.setText(sBuffer.toString());        text_file.setVisible(true);    }        private void toolItem_openWidgetSelected(SelectionEvent evt) {        text_file.setVisible(true);    }        private void toolItem_saveWidgetSelected(SelectionEvent evt) {        String text = text_file.getText();        System.out.println(text);        FileDialog fileDialog = new FileDialog(getShell(), SWT.SAVE);        String[] fileFilters = new String[]{"*.txt","*.java","*.doc"};        fileDialog.setFilterExtensions(fileFilters);        fileDialog.setText("Save a path to save the file");        String selected = fileDialog.open( );        System.out.println(selected);        try {            FileWriter fileWriter = new FileWriter(selected);            BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);            bufferedWriter.write(text);            bufferedWriter.close();            fileWriter.close();        } catch (Exception e) {            e.printStackTrace();        }    }}

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界面显示：

程序启动：

读取文件：

保存文件：

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保存后的文件：