Spring注入Bean时为null
Spring.xml
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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{
//该行报错 loginService为null
User u = loginService.checkInfo(user);
HttpSession session = request.getSession();
session.setAttribute("nickname", u.getNickname());
return "index";
}
}
dao接口：
public interface LoginDao {
//根据email查找User
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
return u;
}
}
service接口：
@Service
public interface LoginService {
public User checkInfo(User user) throws Exception;
}
service实现类：
@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){
//用户名错误
throw new EmailErrorException("用户名错误");
}else if(!u.getPassword().equals(user.getPassword())){
//密码错误
throw new PasswordErrorException("密码错误");
}else{
//用户名和密码正确
return u;
}
}
}
本文名称：Spring注入Bean时为null
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