import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.*; class wj extends JFrame implements ActionListener { FileReader r_file; FileWriter w_file; BufferedReader buf_reader; BufferedWriter buf_writer; JTextArea txt; JButton an1,an2; JPanel p; wj() { setSize(200,200); setVisible(true); txt=new JTextArea(10,10); an1=new JButton("读取"); an2=new JButton("显示"); an1.addActionListener(this); an2.addActionListener(this); p=new JPanel(); add(txt,"center"); add(p,"south"); p.setLayout(new FlowLayout()); p.add(an1); p.add(an2); validate(); setDefaultCloseOperation(EXIT_ON_CLOSE); } public void actionPerformed(ActionEvent e) { if (e.getSource()==an1) { readFile(); } if (e.getSource()==an2) { writeFile(); } } public void readFile() { String s; try { File f=new File("D:/jtext/","input.txt"); r_file=new FileReader(f); buf_reader=new BufferedReader(r_file); } catch (IOException ef) { System.out.println(ef); } try { while ((s=buf_reader.readLine())!=null); { txt.append(s+'\n'); } } catch (IOException er) { System.out.println(er); } } public void writeFile() { try { w_file=new FileWriter("output.txt"); buf_writer=new BufferedWriter(w_file); String str= txt.getText(); buf_writer.write(str,0,str.length()); buf_writer.flush(); } catch (IOException ew) { System.out.println(ew); } } } public class 文件流 { public static void main(String[] args) { wj w=new wj(); } }修改代码在文本文件a.txt输入一段短文,统计文件中字符的个数并将结果写入另一个文件b.txt中
时间: 2024-02-14 17:20:43 浏览: 23
import java.io.*;
public class 文件流 {
public static void main(String[] args) {
try {
// 读取文件a.txt
FileReader fr = new FileReader("a.txt");
BufferedReader br = new BufferedReader(fr);
String str = "";
int count = 0;
while ((str = br.readLine()) != null) {
count += str.length();
}
br.close();
fr.close();
// 写入文件b.txt
FileWriter fw = new FileWriter("b.txt");
BufferedWriter bw = new BufferedWriter(fw);
bw.write("字符个数:" + count);
bw.flush();
bw.close();
fw.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}