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) new User(), params);

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;

}

}

}

分享标题：Spring注入Bean时为null
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