public static boolean CopyFile(java.io.File filefrom, java.io.File fileto,
boolean rewrite) {
if (!filefrom.exists()) {
System.out.println("文件不存在");
return false;
}
if (!filefrom.isFile()) {
System.out.println("不能够复制文件夹");
return false;
}
if (!filefrom.canRead()) {
System.out.println("不能够读取需要复制的文件");
return false;
}
if (!fileto.getParentFile().exists()) {
fileto.getParentFile().mkdirs();
}
if (fileto.exists() && rewrite) {
fileto.delete();
}
/*
if (!fileto.canWrite()) {
System.out.println("不能够写将要复制的文件" + fileto.getPath());
return false;
}*/
try {
java.io.FileInputStream fosfrom = new java.io.FileInputStream(filefrom);
java.io.FileOutputStream fosto = new FileOutputStream(fileto);
byte bt[] = new byte[1024];
int c;
while ( (c = fosfrom.read(bt)) > 0) {
fosto.write(bt, 0, c);
}
fosfrom.close();
fosto.close();
return true;
}
catch (Exception ex) {
ex.printStackTrace();
return false;
} }
public static boolean CopyFile(String from, String to) {
java.io.File filefrom = new java.io.File(from);
java.io.File fileto = new java.io.File(to);
return CopyFile(filefrom, fileto, true);
}
a.java:17: cannot resolve symbol
symbol : variable getRuntime
location: class java.lang.Runtime
Runtime.getRuntime.Exec("cp example.jsp a2.jsp");
^
1 error
{
Runtime.getRuntime().exec("cp c://a.jsp c://a2.jsp");
}
catch(Exception e){System.out.println(e.getMessage());}
我改成这样通过了,但是运行出错:CreateProcess: cp c://a.jsp c://a2.jsp error=2
??????
文件的读写,把一个文件的内容写到另一个文件中
使用方法是:
编译文件 javac FileWriteRead.java
运行程序 java 源文件名 目标文件名
@author Wang Draco
Date 2004-07-13
*/
import java.io.*;
class FileWriteRead {
public static void main(String args[]) throws IOException{
int i;
FileInputStream fin;
FileOutputStream fout;
try {
// open input file
try {
fin = new FileInputStream(args[0]);
} catch(FileNotFoundException e) {
System.out.println("Input File Not Found");
return;
}
// open output file
try {
fout = new FileOutputStream(args[1]);
} catch(FileNotFoundException e) {
System.out.println("Error Opening Output File");
return; }
} catch(ArrayIndexOutOfBoundsException e) {
System.out.println("Usage: CopyFile From To");
return;
}
// Copy File
try {
do {
i = fin.read();
if(i != -1) fout.write(i);
} while(i != -1);
} catch(IOException e) {
System.out.println("File Error");
}
fin.close();
fout.close();
}
}
* 程序编写:jason guo
* 个人网站:http://osdev.m165.com
*
* faq author:raul2002 (raul)
* faq url:http://community.csdn.net/Expert/topic/3171/3171740.xml?temp=.7026331
* 要求:
* 比如,在 C:\ 有一个文件 a.jsp ,怎样能在同目录下再复制一个,文件名为a2.jsp?
*/
import java.lang.*;
public class OSDEV_File01{
public static void main(String args[])
{
try{
Process pro = Runtime.getRuntime().exec("cmd /c copy c:\\a.jsp c:\\a2.jsp");
}
catch(Exception ex)
{
System.out.println("error");
}
}
}