filewriter与filereader类实例15.04

import java.awt.*;import java.awt.event.*;import java.io.*;import javax.swing.*;public class Ftest extends JFrame { // 创建类，继承Jframe类	PRivate JScrollPane scrollPane;	private static final long serialVersionUID = 1L;	private JPanel jContentPane = null; // 创建面板对象	private JTextArea jTextArea = null; // 创建文本域对象	private JPanel controlPanel = null; // 创建面板对象	private JButton openButton = null; // 创建按钮对象	private JButton closeButton = null; // 创建按钮对象		private JTextArea getJTextArea() {		if (jTextArea == null) {			jTextArea = new JTextArea();		}		return jTextArea;	}		private JPanel getControlPanel() {		if (controlPanel == null) {			FlowLayout flowLayout = new FlowLayout();			flowLayout.setVgap(1);			controlPanel = new JPanel();			controlPanel.setLayout(flowLayout);			controlPanel.add(getOpenButton(), null);			controlPanel.add(getCloseButton(), null);		}		return controlPanel;	}		private JButton getOpenButton() {		if (openButton == null) {			openButton = new JButton();			openButton.setText("写入文件"); // 修改按钮的提示信息			openButton					.addActionListener(new java.awt.event.ActionListener() {						// 按钮的单击事件						public void actionPerformed(ActionEvent e) {							// 创建文件对象							File file = new File("Word.txt");							try {								// 创建FileWriter对象								FileWriter out = new FileWriter(file);								// 获取文本域中文本								String s = jTextArea.getText();								out.write(s); // 将信息写入磁盘文件								out.close(); // 将流关闭							} catch (Exception e1) {								e1.printStackTrace();							}						}					});		}		return openButton;	}		private JButton getCloseButton() {		if (closeButton == null) {			closeButton = new JButton();			closeButton.setText("读取文件"); // 修改按钮的提示信息			closeButton					.addActionListener(new java.awt.event.ActionListener() {						// 按钮的单击事件						public void actionPerformed(ActionEvent e) {							File file = new File("word.txt"); // 创建文件对象							try {								// 创建FileReader对象								FileReader in = new FileReader(file);								char byt[] = new char[1024]; // 创建char型数组								int len = in.read(byt); // 将字节读入数组								// 设置文本域的显示信息								jTextArea.setText(new String(byt, 0, len));								in.close(); // 关闭流							} catch (Exception e1) {								e1.printStackTrace();							}						}					});		}		return closeButton;	}		public Ftest() {		super();		initialize();	}		private void initialize() {		this.setSize(300, 200);		this.setContentPane(getJContentPane());		this.setTitle("JFrame");	}		private JPanel getJContentPane() {		if (jContentPane == null) {			jContentPane = new JPanel();			jContentPane.setLayout(new BorderLayout());			jContentPane.add(getScrollPane(), BorderLayout.CENTER);			jContentPane.add(getControlPanel(), BorderLayout.SOUTH);		}		return jContentPane;	}		public static void main(String[] args) { // 主方法		Ftest thisClass = new Ftest(); // 创建本类对象		thisClass.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);		thisClass.setVisible(true); // 设置该窗体为显示状态	}	/**	 * @return	 */	protected JScrollPane getScrollPane() {		if (scrollPane == null) {			scrollPane = new JScrollPane();			scrollPane.setViewportView(getJTextArea());		}		return scrollPane;	}}