如何得到一个文件的大小

[flyzht]

如何得到一个文件的大小

[happyegg]

File f = new File("test.txt");
long len = f.length();

[redlaputa]

/**
* Returns the length of the file denoted by this abstract pathname.
* The return value is unspecified if this pathname denotes a directory.
*
* @return The length, in bytes, of the file denoted by this abstract
* pathname, or <code>0L</code> if the file does not exist
*
* @throws SecurityException
* If a security manager exists and its <code>{@link
* java.lang.SecurityManager#checkRead(java.lang.String)}</code>
* method denies read access to the file
*/
public long length() {
SecurityManager security = System.getSecurityManager();
if (security != null) {
security.checkRead(path);
}
return fs.getLength(this);
}

[vongood]

long File.lenth();