spring3 mvc的service如何在类中的中的怎么样使用

Posted 2023-05-07

@Service
public class UserServiceImpl implements UserService
@Autowired
private UserDao userDao;
@Transactional
public User findByName(String userName)
User user = null;
user= userDao.getUserByName(userName);
return user;


这样一个service在ShiroDbRealm 使用时，始终无法初始化，但我这个service在普通的@Controller中都是可以使用的，用法也是这样。
public class ShiroDbRealm extends AuthorizingRealm
@Autowired
private UserService userService;
@Override
protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals)
String userName = (String) principals.fromRealm(getName()).iterator().next();
User user= userService.findByName(userName);
if (user != null)
SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
info.addStringPermission("");
return info;

return null;

@Override
protected AuthenticationInfo doGetAuthenticationInfo(
AuthenticationToken token) throws AuthenticationException
UsernamePasswordToken upToken = (UsernamePasswordToken) token;
User user = userService.findByName(upToken.getUsername());
if (user != null)
return new SimpleAuthenticationInfo(user, user.getPassword(), getName());

return null;

参考技术A rhgfhggfb

spring 项目中在类中注入静态字段

有时spring 项目中需要将配置文件的属性注入到类的静态字段中

例如：文件上传

//文件上传指定上传位置
//resource-dev.properties 有如下参数
#upload
UPLOAD_PATH=D:\\home\\images
STATIC_URL=http://127.0.0.1/images/upload/

如果想在类中直接使用，可以通过定义常量类的静态字段来获取

@Component
@PropertySource("classpath:dev/resource-dev.properties")
public class ConstantsFilename {
    //Upload常量

    public static String UPLOAD_PATH;
    public static String STATIC_URL;

    public String getUploadPath() {
        return UPLOAD_PATH;
    }

//将 set 方法的 static 去掉
    @Value("${UPLOAD_PATH}")
    public void setUploadPath(String uploadPath) {
        UPLOAD_PATH = uploadPath;
    }

    public String getStaticUrl() {
        return STATIC_URL;
    }

//将 set 方法的 static 去掉
    @Value("${STATIC_URL}")
    public void setStaticUrl(String staticUrl) {
        STATIC_URL = staticUrl;
    }
}

此时，可以在你的类中直接使用 ConstantsFilename.STATIC_URL 和 ConstantsFilename.UPLOAD_PATH 了。