JAVA_FileReader_FileWriter

 1 import java.io.*;
 2 public class TestFileReader {
 3   public static void main(String[] args) {
 4     FileReader fr = null; 
 5     int c = 0;
 6     try {
 7       fr = new FileReader("d:\\share\\java\\io\\TestFileReader.java");
 8       int ln = 0;
 9       while ((c = fr.read()) != -1) {
10         //char ch = (char) fr.read();
11         System.out.print((char)c);
12         //if (++ln >= 100) { System.out.println(); ln = 0;}
13       }
14       fr.close();
15     } catch (FileNotFoundException e) {
16       System.out.println("找不到指定文件");
17     } catch (IOException e) {
18       System.out.println("文件读取错误");
19     }
20 
21   }
22 }

 1 import java.io.*;
 2 public class TestFileWriter {
 3   public static void main(String[] args) {
 4     FileWriter fw = null;
 5     try {
 6       fw = new FileWriter("d:\\bak\\unicode.dat");
 7       for(int c=0;c<=50000;c++){
 8         fw.write(c);
 9       }
10       fw.close();
11     } catch (IOException e1) {
12         e1.printStackTrace();
13       System.out.println("文件写入错误");
14       System.exit(-1);
15     }
16   }
17 }

 1 import java.io.*;
 2 
 3 public class TestFileWriter2 {
 4     public static void main(String[] args) throws Exception {
 5         FileReader fr = new FileReader("d:/java/io/TestFileWriter2.java");
 6         FileWriter fw = new FileWriter("d:/java/io/TestFileWriter2.bak");
 7         int b;
 8         while((b = fr.read()) != -1) {
 9             fw.write(b);
10         }
11         fr.close();
12         fw.close();
13     }
14 }