java从一个目录拷贝文件或整个文件夹到另一个目录下

Posted 2020-12-29 _陌然浅笑°

** 
* 复制单个文件 
* @param oldPath String 原文件路径 如：c:/fqf.txt 
* @param newPath String 复制后路径 如：f:/fqf.txt 
* @return boolean 
*/ 
public void copyFile(String oldPath, String newPath) { 
try { 
int bytesum = 0; 
int byteread = 0; 
File oldfile = new File(oldPath); 
if (oldfile.exists()) { //文件存在时 
InputStream inStream = new FileInputStream(oldPath); //读入原文件 
FileOutputStream fs = new FileOutputStream(newPath); 
byte[] buffer = new byte[1444]; 
int length; 
while ( (byteread = inStream.read(buffer)) != -1) { 
bytesum += byteread; //字节数 文件大小 
System.out.println(bytesum); 
fs.write(buffer, 0, byteread); 
} 
inStream.close(); 
} 
} 
catch (Exception e) { 
System.out.println("复制单个文件操作出错"); 
e.printStackTrace(); 

} 

} 

/** 
* 复制整个文件夹内容 
* @param oldPath String 原文件路径 如：c:/fqf 
* @param newPath String 复制后路径 如：f:/fqf/ff 
* @return boolean 
*/ 
public void copyFolder(String oldPath, String newPath) { 

try { 
(new File(newPath)).mkdirs(); //如果文件夹不存在 则建立新文件夹 
File a=new File(oldPath); 
String[] file=a.list(); 
File temp=null; 
for (int i = 0; i < file.length; i++) { 
if(oldPath.endsWith(File.separator)){ 
temp=new File(oldPath+file[i]); 
} 
else{ 
temp=new File(oldPath+File.separator+file[i]); 
} 

if(temp.isFile()){ 
FileInputStream input = new FileInputStream(temp); 
FileOutputStream output = new FileOutputStream(newPath + "/" + 
(temp.getName()).toString()); 
byte[] b = new byte[1024 * 5]; 
int len; 
while ( (len = input.read(b)) != -1) { 
output.write(b, 0, len); 
} 
output.flush(); 
output.close(); 
input.close(); 
} 
if(temp.isDirectory()){//如果是子文件夹 
copyFolder(oldPath+"/"+file[i],newPath+"/"+file[i]); 
} 
} 
} 
catch (Exception e) { 
System.out.println("复制整个文件夹内容操作出错"); 
e.printStackTrace(); 

} 

}