一道大题
(1) 在程序界面由上至下依次设按钮A、文本A、按钮B、文本B、按钮C
(2) 按按钮A后，读取外部文件"input.txt"，将其显示在文本区A中
(3) 按按钮B后，找出文本A中的各英文单词(注意剔除其中的标点)，将其按照字典序降序排序后在文本B中逐行输出
(4) 按按钮C后，将文本区B中的内容写入外部文件"output.txt"
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Exam {
private JButton btnA;
private JTextArea txtAreaA;
private JScrollPane jspA;
private JButton btnB;
private JTextArea txtAreaB;
private JScrollPane jspB;
private JButton btnC;
public Exam(){
JFrame frame = new JFrame("2011.06.10 Exam");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setSize(400, 300);
JPanel pan = new JPanel();
BoxLayout b = new BoxLayout(pan, BoxLayout.Y_AXIS);
pan.setLayout(b);
btnA = new JButton("Button A");
btnA.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
FileInputStream fis = null;
InputStreamReader isr = null;
try{
String path = System.getProperty("user.dir");
path = path+"/input.txt";
//String path = "c://input.txt";
File file = new File(path);
fis = new FileInputStream(file);
isr = new InputStreamReader(fis);
StringBuilder textA = new StringBuilder();
int v ;
while(true){
v = isr.read();
if(v==-1){
break;
}
textA.append((char)v);
}
txtAreaA.setText(textA.toString());
}catch (Exception ee) {
ee.printStackTrace();
}finally{
try{
if(null!=isr)isr.close();
}catch(Exception ee){
ee.printStackTrace();
}
try{
if(null!=fis)fis.close();
}catch(Exception ee){
ee.printStackTrace();
}
}
}
});
txtAreaA = new JTextArea();
jspA = new JScrollPane();
jspA.add(txtAreaA);
jspA.setViewportView(txtAreaA);
btnB = new JButton("Button B");
btnB.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String text = txtAreaA.getText();
String strArr[] = text.split("[^\\w]");
List<String> strList = new ArrayList<String>();
String s;
for(int i=0;i<strArr.length;i++){
s = strArr[i];
if(!"".equals(s)){
strList.add(s.replace("\n", ""));
}
}
Collections.sort(strList);
StringBuilder strText = new StringBuilder();
for(int j=strList.size()-1;j>=0;j--){
strText.append(strList.get(j)).append("\n");
}
txtAreaB.setText(strText.toString());
}
});
txtAreaB = new JTextArea();
jspB = new JScrollPane();
jspB.add(txtAreaB);
jspB.setViewportView(txtAreaB);
btnC = new JButton("Button C");
btnC.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String textB = txtAreaB.getText();
textB = textB.replace("\n", "\r");
FileOutputStream fos = null;
OutputStreamWriter osw = null;
try{
String path = System.getProperty("user.dir");
path = path+"/output.txt";
//String path = "c://output.txt";
File file = new File(path);
fos = new FileOutputStream(file);
osw = new OutputStreamWriter(fos);
osw.write(textB);
}catch (Exception ee) {
ee.printStackTrace();
}finally{
try{
if(null!=osw)osw.close();
}catch(Exception ee){
ee.printStackTrace();
}
try{
if(null!=fos)fos.close();
}catch(Exception ee){
ee.printStackTrace();
}
}
JOptionPane.showMessageDialog(null,"write output.txt over");
}
});
pan.add(btnA);
pan.add(jspA);
pan.add(btnB);
pan.add(jspB);
pan.add(btnC);
frame.add(pan);
frame.setVisible(true);
}
/**
* @param args
*/
public static void main(String[] args) {
new Exam();
}
}