ORA 28002 Oracle 11g has a password expiration problem

The fault phenomenon
ORA-28002: the password will expire within 7 days Oracle Database 11g ORA-28002: the password will expire within 7 days
[11:01:00oracle@dvd db_1]$sqlplus wang/oracle
SQL*Plus: Release 11.2.0.1.0 Production on Fri Nov 16 11:01:23 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
ERROR:
ORA-28002: the password will expire within 7 days
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the OLAP and Data Mining options
wang@SUN >

The cause of the problem
Oracle 11G There is a 180-day default password period for normal users. This is when the default password period is about to expire.

The solution
View the current user corresponding to profile and corresponding password period
select * from dba_profiles where profile='DEFAULT' AND resource_name='PASSWORD_LIFE_TIME';
alter profile default limit password_life_time unlimited;
SELECT username,PROFILE FROM dba_users where username like upper(' & USER');
sys@SUN > SELECT username,PROFILE FROM dba_users where username like upper(' & USER');
Enter value for user: wang
old 1: SELECT username,PROFILE FROM dba_users where username like upper(' & USER')
new 1: SELECT username,PROFILE FROM dba_users where username like upper('wang')
USERNAME PROFILE
------------------------------ ------------------------------
WANG DEFAULT
Mysql > select Profile from user where DEFAULT = DEFAULT
sys@SUN > set lines 222
sys@SUN > col PROFILE for a20
sys@SUN > col RESOURCE_NAME for a20
sys@SUN > col RESOURCE_TYPE for a20
sys@SUN > col LIMIT for a20
sys@SUN > select * from dba_profiles where profile='DEFAULT' AND resource_name='PASSWORD_LIFE_TIME';
PROFILE RESOURCE_NAME RESOURCE_TYPE LIMIT
-------------------- -------------------- -------------------- --------------------
DEFAULT PASSWORD_LIFE_TIME PASSWORD 180
profile password lifetime is 180 days
Change the current user to profile to the corresponding password period
sys@SUN > alter profile default limit password_life_time 365;
Profile altered.
Change the password lifetime configuration for profile to 365 days
sys@SUN > alter profile default limit password_life_time unlimited;
Profile altered.
Change the password life cycle configuration for profile to unrestricted