用java在linux下修改文件权限
String cmdStrs[] = new String[]{ "chmod","-R","775", "/var/www/userweb2/" + companyId + "/" + Constants.BBSFILE };

public static boolean execCmd( String[] cmdStrs ){
try {
Process child = Runtime.getRuntime().exec(cmdStrs);

BufferedReader in = new BufferedReader(new InputStreamReader(child
.getInputStream()));

String c = null;
while ((c = in.readLine()) != null) {
System.out.println(c + "<br/>");
}
child.waitFor();
in.close();
} catch (Exception e) {
System.out.println("\n===执行linux命令出错");
e.printStackTrace();
return false;
}
return true;
}