Question

java实现:将一个记事本文件内容复制到另一个文件

Answer 1

主要是用到java里面的i/o流。代码例子如下：

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

/**
 * java读写文件,复制文件
 * 读取d:/1.txt文件内容,写入f:/text.txt文件中.
 * @author young
 *
 */
public class FileWriterTest {
	// 读写文件
	public static void rwFile(){
		FileWriter fw = null;
		BufferedReader br = null;
		try {
			fw = new FileWriter("f:\\text.txt", true);
			br = new BufferedReader(new InputStreamReader(
					new FileInputStream("d:\\1.txt"), "UTF-8"));
			String line = null;
			while ((line = br.readLine()) != null) {
				System.out.println("文件内容: " + line);
				fw.write(line);
				fw.flush();
			}
			br.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (fw != null) {
				try {
					fw.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}

	public static void main(String[] args) {
		rwFile();
	}
}

首先在D盘新建文件1.txt，输入任意内容。然后执行java代码即可。

Answer 2

new File("E:/abc.txt")renameTo(new File("F:/abc.txt"))方法，一行解决问题。

Answer 3

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyMove {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
CopyMove cm = new CopyMove();
cm.copy("h:\\1.txt", "c:\\2.txt");
cm.move("h:\\3.txt", "h:\\r\\e\\4.txt");
}
//文件复制前必须得到当前文件夹名字且要有\
//当复制深层次路径时要用mkdirs方法
public void copy(String path1,String path2){
try {
FileInputStream fis = new FileInputStream(path1);
int l = fis.available();
byte[] c = new byte[l];
fis.read(c);
fis.close();
int i = path2.lastIndexOf("\\")+1;
System.out.println(i);
String path = path2.substring(0, i);
System.out.println(path);
File f = new File(path);
f.mkdirs();
// System.out.println(f.getAbsolutePath());
// System.out.println(f.isDirectory());
FileOutputStream fos = new FileOutputStream(path2);
fos.write(c);
fos.close();
System.out.println("文件复制成功");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
System.out.println("文件复制失败");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public void move(String path1,String path2){
try {
FileInputStream fis = new FileInputStream(path1);
int l = fis.available();
byte[] c = new byte[l];
fis.read(c);
fis.close();
int i = path2.lastIndexOf("\\");
//System.out.println(i);
String path = path2.substring(0, i);
System.out.println(path);
File f = new File(path);
f.mkdirs();
// System.out.println(f.getAbsolutePath());
// System.out.println(f.isDirectory());
FileOutputStream fos = new FileOutputStream(path2);
fos.write(c);
fos.close();
System.out.println("文件移动成功");
File f2 = new File(path1);
f2.delete();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
System.out.println("文件移动失败");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}