Springboot filter 拦截指定的路径(注入spring Bean方式)

最新推荐文章于 2025-01-17 20:53:57 发布

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本文介绍了一种系统URL过滤器的实现方式，该过滤器通过拦截特定URL来控制用户访问系统的权限。首先创建了一个名为SystemUrlFilter的过滤器类，并在其中实现了过滤逻辑。接着在配置文件中注册了该过滤器，设置了排除规则，如静态资源和注册页面等。

第一步:创建过滤器,引入bean

public class SystemUrlFilter implements Filter {

    @Autowired
    private UserService userService;

     private String[] prefixIignores ;
     private String ignoresParam;

    @Override
    public void init(FilterConfig config) throws ServletException {
        ignoresParam = config.getInitParameter("exclusions");  
        if (StringUtils.isNotEmpty(ignoresParam)) {  
            prefixIignores = ignoresParam.split(",");  
        }  
            return;  
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
         HttpServletRequest request = (HttpServletRequest) req;
         AttributePrincipal principal = (AttributePrincipal)request.getUserPrincipal();
         if (canIgnore(request)) {  
             chain.doFilter(request, response);
                return;  
            } 

         Map<String, Object> attributes = principal.getAttributes();
         String username = (String) attributes.get("username");
         User user = null;
         try {
             user = userService.findUserByUsername(username);
             chain.doFilter(request, response);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    @Override
    public void destroy() {
        // TODO Auto-generated method stub
         prefixIignores=null;  
    }

     private boolean canIgnore(HttpServletRequest request) {  
        boolean isExcludedPage = false;
        for (String page : prefixIignores) {// 判断是否在过滤url之外
            if (((HttpServletRequest) request).getServletPath().equals(page)) {
                isExcludedPage = true;
                break;
            }
        }
        return isExcludedPage;
    }


第二步:注册filter到配置中

@Configuration
public class WebConfig

  /**
     * 拦截用户访问系统权限fi 
     * @return
     */
    @Bean
    public FilterRegistrationBean systemUrlFilterBean() {
         FilterRegistrationBean registrationBean = new FilterRegistrationBean();
          registrationBean.setFilter(new DelegatingFilterProxy("systemUrlFilter"));
          registrationBean.addInitParameter("targetFilterLifecycle","true");
          registrationBean.addUrlPatterns("/*");
          registrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/reg");
          registrationBean.setDispatcherTypes(DispatcherType.REQUEST);
          return registrationBean;
    }

    @Bean(name="systemUrlFilter")
    public SystemUrlFilter systemUrlFilter(){
        return new SystemUrlFilter();
    }