java的一些语法基础（三）

/**
* 根据路径创建文件夹
* @param folderPath
* @return boolean
*/
public static boolean createFolder(String folderPath) {
boolean flag = false;
File f = new File(folderPath);
flag = f.mkdirs();
return flag;
}
/**
* @param args
*/
public static void main(String[] args) {
System.out.println(createFolder("e:\\fxf\\fxf"));;
}

/**
* 根据路径创建文件夹
* @param folderPath
* @return boolean
*/
public static boolean createFolder(String folderPath) {
boolean flag = false;
File f = new File(folderPath);
flag = f.mkdirs();
return flag;
}
/**
* @param args
*/
public static void main(String[] args) {
System.out.println(createFolder("e:\\fxf\\fxf"));;
}

/**
* 根据路径，如果是文件夹，输出该文件夹下文件名以及子文件夹的文件名称
* @param folderPath
*/
public static void displayUnderFolderAndChildFloder(String folderPath) {
File f = new File(folderPath);
if (f.isDirectory()) {
System.out.println(f.getAbsolutePath() + "文件夹下文件有：");
File[] fileArray = f.listFiles();
if (fileArray != null) {
for (int m = 0; m < fileArray.length; m++) {
if (fileArray[m].isDirectory()) {
displayUnderFolderAndChildFloder(fileArray[m].getAbsolutePath());
} else {
System.out.println(fileArray[m].getName());
}
}
}
}
}
/**
* @param args
*/
public static void main(String[] args) {
displayUnderFolderAndChildFloder("E:\\data");
}

/**
* 根据路径创建文件
* @param folderPath
* @return boolean
*/
public static boolean createFile(String folderPath) {
boolean flag = false;
File f = new File(folderPath);
try {
flag = f.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
return flag;
}

/**
* 根据文件路径获取文件长度，如果是文件夹返回0
* @param filePath
* @return String
*/<strong>
</strong>public static String getFileLength(String filePath) {
String fileLength = "";
File f = new File(filePath);
if (!f.isDirectory()) {

try {
FileInputStream fInput = new FileInputStream(f);
fileLength = String.valueOf(fInput.available());
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
//fileLength = String.valueOf(f.length());//该方法好像也可以，测试文字型文件，两种获取长度都一样
} else {
fileLength = "0";
}
return fileLength;
}