无法在春季自动连接我的身份验证过滤器中的服务

java hibernate spring spring-mvc

2022-08-31 19:45:39

我正在尝试通过令牌对用户进行身份验证，但是当我尝试在i get null指针异常中自动连接一个我的服务时。因为自动连接服务是空的，我该如何解决这个问题？AuthenticationTokenProcessingFilter

我的班级AuthenticationTokenProcessingFilter

@ComponentScan(basePackages = {"com.marketplace"})
public class AuthenticationTokenProcessingFilter extends GenericFilterBean {

    @Autowired
    @Qualifier("myServices")
    private MyServices service;

    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        @SuppressWarnings("unchecked")
        Map<String, String[]> parms = request.getParameterMap();

        if (parms.containsKey("token")) {
            try {
                String strToken = parms.get("token")[0]; // grab the first "token" parameter

                User user = service.getUserByToken(strToken);
                System.out.println("Token: " + strToken);

                DateTime dt = new DateTime();
                DateTimeFormatter fmt = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss");
                DateTime createdDate = fmt.parseDateTime(strToken);
                Minutes mins = Minutes.minutesBetween(createdDate, dt);


                if (user != null && mins.getMinutes() <= 30) {
                    System.out.println("valid token found");

                    List<GrantedAuthority> authorities = new ArrayList<GrantedAuthority>();
                    authorities.add(new SimpleGrantedAuthority("ROLE_ADMIN"));

                    UsernamePasswordAuthenticationToken token = new UsernamePasswordAuthenticationToken(user.getEmailId(), user.getPassword());
                    token.setDetails(new WebAuthenticationDetails((HttpServletRequest) request));
                    Authentication authentication = new UsernamePasswordAuthenticationToken(user.getEmailId(), user.getPassword(), authorities); //this.authenticationProvider.authenticate(token);

                    SecurityContextHolder.getContext().setAuthentication(authentication);
                }else{
                    System.out.println("invalid token");
                }
            } catch(Exception e) {
                e.printStackTrace();
            }
        } else {
            System.out.println("no token found");
        }
        // continue thru the filter chain
        chain.doFilter(request, response);
    }
}

我尝试在我的AppConfig

@Bean(name="myServices")
    public MyServices stockService() {
        return new MyServiceImpl();
    }

我的应用配置注释是

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.marketplace")
public class AppConfig extends WebMvcConfigurerAdapter {

答案 1

不能开箱即用地从筛选器使用依赖关系注入。虽然您正在使用GenericFilterBean，但您的Servlet Filter不受spring管理。正如javadocs所指出的

这个泛型过滤器基类不依赖于Spring org.springframework.context.ApplicationContext概念。过滤器通常不会加载自己的上下文，而是从Spring根应用程序上下文中访问服务bean，可以通过过滤器的ServletContext访问（参见org.springframework.web.context.support.WebApplicationContextUtils）。

用简单的英语来说，我们不能指望spring注入服务，但我们可以在第一次调用时懒惰地设置它。例如：

public class AuthenticationTokenProcessingFilter extends GenericFilterBean {
    private MyServices service;
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        if(service==null){
            ServletContext servletContext = request.getServletContext();
            WebApplicationContext webApplicationContext = WebApplicationContextUtils.getWebApplicationContext(servletContext);
            service = webApplicationContext.getBean(MyServices.class);
        }
        your code ...    
    }

}

答案 2

这是一个足够古老的问题，但我会为那些喜欢我的人添加我的答案谷歌这个问题.

您必须从中继承过滤器并将其标记为弹簧GenericFilterBean@Component

@Component
public class MyFilter extends GenericFilterBean {

    @Autowired
    private MyComponent myComponent;

 //implementation

}

然后在春季上下文中注册它：

@Configuration
public class MyFilterConfigurerAdapter extends WebMvcConfigurerAdapter {

    @Autowired
    private MyFilter myFilter;

    @Bean
    public FilterRegistrationBean myFilterRegistrationBean() {
        FilterRegistrationBean regBean = new FilterRegistrationBean();
        regBean.setFilter(myFilter);
        regBean.setOrder(1);
        regBean.addUrlPatterns("/myFilteredURLPattern");

        return regBean;
    }
}

这可以正确地自动连接过滤器中的组件。