Question

JAVA 高手解决 从键盘上读入任意数量字符，并写到文本文件中，再把字符串复制到另外一个文件中

Answer 1

import java.io.*;

public class Demo {
File file=new File("f:\\demo.txt");//目的地文件
public void test()
{
try
{

FileWriter write=new FileWriter(file);
InputStreamReader reader=new InputStreamReader(System.in);
BufferedReader buf=new BufferedReader(reader);
String s;
System.out.println("Input the string:");

s=buf.readLine();
while(!s.equals("quit"))//以“quit”结束
{
write.write(s+"\r\n");

write.flush();
s=buf.readLine();
}
reader.close();
write.close();
System.out.println("write finished");
}
catch(Exception e)
{
e.printStackTrace();
}
}
File copyfile=new File("f:\\copy.txt");//复制到另一个文件中
public void copy()
{
try
{
FileReader reader=new FileReader(file);
FileWriter writer=new FileWriter(copyfile);
int ch;
while((ch=reader.read())!=-1)
{
writer.write((char)ch);
writer.flush();
}
reader.close();
writer.close();
System.out.println("copy finished");
}
catch(Exception ee)
{
ee.printStackTrace();
}
}

}

Answer 2

输入，输出流。

inputStream outputStream

Answer 3

import java.io.*;
import java.util.Scanner;

public class Filein {

public static void main(String[] args) {
Scanner in = new Scanner(System.in);
FileOutputStream fOS;
try {
fOS = new FileOutputStream("file.txt");

System.out.println("请输入数据（end 结束输入）");
while (true) {

String s = in.nextLine();
if (s.equalsIgnoreCase("end"))
break;
fOS.write(s.getBytes());
fOS.write("\n".getBytes());
}
fOS.close();
FileInputStream fIS = new FileInputStream("file.txt");
FileOutputStream fOS1 = new FileOutputStream("copy.txt");
int i = fIS.read();
while (i != -1) {
fOS1.write(i);
i = fIS.read();
}
fOS.close();
fOS1.close();
fIS.close();
in.close();
} catch (Exception e) {

e.printStackTrace();
}
}
}