springboot整合拦截器和过滤器

1.拦截器：

新建拦截器：

public class DemoInterceptor implements HandlerInterceptor
{
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
        throws Exception
    {
        String name = request.getParameter("name");
        System.out.println("DemoInterceptor..." + name);
        return true;
    }
}

配置类：

@Configuration
public class MyWebMvcConfig implements WebMvcConfigurer
{
    @Override
    public void addInterceptors(InterceptorRegistry registry)
    {
        InterceptorRegistration demoInterceptor = registry.addInterceptor(new DemoInterceptor());
        demoInterceptor.addPathPatterns("/*");
//        等同于：registry.addInterceptor(new DemoInterceptor()).addPathPatterns("/*");
    }
}

测试：

controller:

@GetMapping("/demo")
public String demo(String name)
{
    return "demo";
}

访问：http://localhost:8088/demo?name=zs  结果：

2.过滤器

新建过滤器：

public class DemoFilter implements Filter
{
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
        throws IOException, ServletException
    {
        String name = request.getParameter("name");
        System.out.println("DemoFilter..." + name);
        chain.doFilter(request, response);
    }
}

配置类中：

@Bean
public FilterRegistrationBean demoFilterRegist() {
    FilterRegistrationBean registration = new FilterRegistrationBean(new DemoFilter());
    registration.addUrlPatterns("/*");
    return registration;
}

测试结果：

 

亦可用注解的形式：

在过滤器上加注解：@WebFilter(urlPatterns = "/*")

在启动类上加注解：@ServletComponentScan(basePackages = "com.app.config.filter")

@ServletComponentScan会扫描servlet相关的注解

关于之前文章中提到的在拦截器中验证token：

文章链接：https://blog.csdn.net/qq_34928194/article/details/103879771

拦截器：

@Component
public class TokenInterceptor implements HandlerInterceptor
{
    @Autowired
    private JwtUtils jwtUtils;
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
        throws Exception
    {
        response.setCharacterEncoding("utf-8");
        String token = request.getHeader("token");
        if (StringUtils.isEmpty(token))
        {
            token = request.getHeader("Authorization");
        }
        if (StringUtils.isEmpty(token))
        {
            token = request.getParameter("token");
        }
        HashMap<String, String> result = new HashMap<String, String>();
        result.put("message", "token认证失败！");
        if (handler instanceof HandlerMethod)
        {
            if (CommonUtil.isNotEmpty(token))
            {
                int verify = jwtUtils.verify(token);
                if (0 == verify)
                {
                    return true;
                } 
                else if (1 == verify)
                {
                    result.put("message", "token已过期！");
                }
            }
        }
        response.getWriter().write(JSONObject.toJSONString(result));
        return false;
    }
}

配置类：

@Autowired
private TokenInterceptor tokenInterceptor;
@Override
public void addInterceptors(InterceptorRegistry registry)
{
    String[] excludePath = new String[] {"/api/login"};
    registry.addInterceptor(tokenInterceptor).addPathPatterns("/api/**").excludePathPatterns(excludePath);
}