SpringBoot使用過濾器

方式一

1. 創建過濾器實現類實現Filter接口。並添加@WebFilter注解。

@WebFilter(urlPatterns = {"/student"})
public class StudentFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("過濾器執行...");
        String username = servletRequest.getParameter("username");
        if(username.contains("sb")){
            username = username.replaceAll("sb","*");
        }
        System.out.println(username);
        servletRequest.setAttribute("username",username);
        filterChain.doFilter(servletRequest, servletResponse);
    }
}

2. 在springBoot入口類配置@ServletComponentScan注解

方式二

1. 創建一個普通的Filter實現類，不添@WebFilter注解。

public class UserFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("過濾器執行...");
        String username = servletRequest.getParameter("username");
        if(username.contains("sb")){
            username = username.replaceAll("sb","*");
        }
        System.out.println(username);
        servletRequest.setAttribute("username",username);
        filterChain.doFilter(servletRequest, servletResponse);
    }
}

2. 創建過濾器核心配置類。

@Configuration
public class FilterConfig {
    @Bean
    public FilterRegistrationBean filterRegistrationBean(){
        FilterRegistrationBean<UserFilter> filter = new FilterRegistrationBean<>(new UserFilter());
        filter.addUrlPatterns("/user");
        return filter;
    }
}