Null when Spring is injected into Bean
Spring.xml
Jdbc.properties
Driver=com.mysql.jdbc.Driver
Url=jdbc:mysql://127.0.0.1:3306/xmscode?useUnicode=true&characterEncoding=utf8
User=root
Password=1234
Controller:
@ Controller
@ RequestMapping ("login")
Public class LoginController {
Private LoginService loginService
Public LoginService getLoginService () {
Return loginService
}
Public void setLoginService (LoginService loginService) {
This.loginService = loginService
}
@ RequestMapping ("tologin")
Public String toLogin () {
Return "login"
}
@ RequestMapping ("login")
Public String login (User user, HttpServletRequest request) throws Exception {
/ / the line reported an error loginService as null
User u = loginService.checkInfo (user)
HttpSession session = request.getSession ()
Session.setAttribute ("nickname", u.getNickname ())
Return "index"
}
}
Dao interface:
Public interface LoginDao {
/ / find User according to email
Public User findUserByEmail (User user) throws Exception
}
DaoImpl:
@ Repository
Public class LoginDaoImpl implements LoginDao {
Private JdbcTemplate jdbcTemplate
Public JdbcTemplate getJdbcTemplate () {
Return jdbcTemplate
}
Public void setJdbcTemplate (JdbcTemplate jdbcTemplate) {
This.jdbcTemplate = jdbcTemplate
}
Public User findUserByEmail (User user) throws Exception {
User u = null
String sql = "select * from xc_user where email=?"
Object [] params = new Object [] {user.getEmail ()}
U = jdbcTemplate.queryForObject (sql, (RowMapper) new User (), params)
Return u
}
}
Service interface:
@ Service
Public interface LoginService {
Public User checkInfo (User user) throws Exception
}
Service implementation class:
@ Service
Public class loginServiceImpl implements LoginService {
Private LoginDao loginDao
Public LoginDao getLoginDao () {
Return loginDao
}
Public void setLoginDao (LoginDao loginDao) {
This.loginDao = loginDao
}
Public User checkInfo (User user) throws Exception {
System.out.println ("loginDao" + loginDao)
User u = null
U = loginDao.findUserByEmail (user)
If (u==null) {
/ / user name error
Throw new EmailErrorException ("user name error")
} else if (! u.getPassword (). Equals (user.getPassword () {
/ / incorrect password
Throw new PasswordErrorException ("password error")
} else {
/ / user name and password are correct
Return u
}
}
}
