filewriter与filereader类实例15.04

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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;}
}

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