Sprintboot过滤器配置

1、创建一个自定义过滤器

public class MyFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
 
    }
 
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        // TODO 过滤器要做的事情
        
        // 将请求传递到下一个过滤器
        filterChain.doFilter(servletRequest, servletResponse);
    }
 
    @Override
    public void destroy() {
 
    }
}

2、注册自定义过滤器

2.1、通过@WebFilter注解

添加注解@WebFilter

@WebFilter(urlPatterns = "/*", filterName = "myFilter")
public class MyFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
 
    }
 
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        // TODO 过滤器要做的事情
        
        // 将请求传递到下一个过滤器
        filterChain.doFilter(servletRequest, servletResponse);
    }
 
    @Override
    public void destroy() {
 
    }
}

缺点：不能设置过滤器之间的优先级

2.2、通过FilterRegistrationBean注册

在配置类中创建FilterRegistrationBean

@Bean
public FilterRegistrationBean<Filter> filterRegistrationBean(SecurityManager securityManager,UserService userService) throws Exception{
    FilterRegistrationBean<Filter> filterRegistration = new FilterRegistrationBean<Filter>();
    // 注册一个filter，需要new或者spring自动装配
    filterRegistration.setFilter(filter);
    // 设置过滤器的名字，如果不指定，将使用bean的名字
    filterRegistration.setName("myFilter");
    // 设置过滤规则
    filterRegistration.addUrlPatterns("/*");
    // 让spring来管理过滤器的生命周期而不是让tomcat，默认true
    filterRegistration.addInitParameter("targetFilterLifecycle", "true");
    // 开启异步支持，默认true
    filterRegistration.setAsyncSupported(true);
    // 启用过滤器，默认true
    filterRegistration.setEnabled(true);
    // 设置调度程序类型
    filterRegistration.setDispatcherTypes(DispatcherType.REQUEST);
    // 设置优先级
    filterRegistration.setOrder(1);
    return filterRegistration;
}