Java 文件操作！

public class FileOperate {

/**
* 创建目录
* @param folderPath:目录路径
* @return
* @throws IOException
*/
public static boolean createFolder(String folderPath) throws IOException{
boolean result = false;
File f = new File(folderPath);
result = f.mkdirs();
return result;
}
/**
* 删除目录下所有文件
* @param directory (File 对象)
*/
public void emptyDirectory(File directory) {
File[] entries = directory.listFiles();
for (int i = 0; i < entries.length; i++) {
entries[i].delete();
}
}

* 创建文件
* @param filepath:文件所在目录路径,比如:c:/test/test.txt
* @return
*/
public static boolean makeFile(String filepath) throws IOException{
boolean result = false;
File file = new File(filepath);
result = file.createNewFile();
file = null;
return result;
}
/**
* 删除文件
* @param filepath:文件所在物理路径
* @return
*/
public static boolean isDel(String filepath){
boolean result = false;
File file = new File(filepath);
result = file.delete();
file = null;
return result;
}
/**
* 文件重命名
* @param filepath:文件所在物理路径
* @param destname:新文件名
* @return
*/
public static boolean renamefile(String filepath,String destname){
boolean result = false;
File f = new File(filepath);
String fileParent = f.getParent();
String filename = f.getName();
File rf = new File(fileParent+"//"+destname);
if(f.renameTo(rf)){
result = true;
}
f = null;
rf = null;
return result;
}
/**
* 将文件内容写入数据库中
* @param filepath:文件所在物理路径
* @param content:写入内容
* @throws Exception
*/
public static void WriteFile(String filepath,String content) throws Exception {
FileWriter filewriter = new FileWriter(filepath,true);//写入多行
PrintWriter printwriter = new PrintWriter(filewriter);
printwriter.println(content);
printwriter.flush();
printwriter.close();
filewriter.close();
}
/**
* 日志备份
* @param filePath:日志备份路径
* @param baksize:日志备份大小参考值(字节大小)
* @throws IOException
*/
public static void logBak(String filePath,long baksize) throws IOException{
File f = new File(filePath);
long len = f.length();
SimpleDateFormat simpledateformat = new SimpleDateFormat("yyyyMMddHHmmss");
String s = simpledateformat.format(new Date());
String fileName = f.getName();
int dot = fileName.indexOf(".");
String bakName = s+fileName.substring(dot);
System.out.println(bakName);
if(len>=baksize){
renamefile(filePath,bakName);
makeFile(filePath);
}
f = null;
}

}