springboot中FilterRegistrationBean来注册过滤器

现在借助servlet中的接口Filter定义三个filter

public class MyFilter1 implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println(filterConfig.getInitParameter("a"));//获取参数值
        System.out.println("执行Controller前的MyFilter1-init处理");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("执行Controller前的MyFilter1-doFilter处理");
        filterChain.doFilter(servletRequest,servletResponse);
        System.out.println("执行Controller后的MyFilter1-doFilter处理");
    }

    @Override
    public void destroy() {
        System.out.println("执行Controller前的MyFilter1-destroy处理"); //项目停止的时候执行
    }
}

public class MyFilter2 implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("执行Controller前的MyFilter2-init处理");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("执行Controller前的MyFilter2-doFilter处理");
        filterChain.doFilter(servletRequest,servletResponse);
        System.out.println("执行Controller后的MyFilter2-doFilter处理");
    }

    @Override
    public void destroy() {
        System.out.println("执行Controller前的MyFilter2-destroy处理");//项目停止的时候执行
    }
}

public class MyFilter3 implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("执行Controller前的MyFilter3-init处理");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("执行Controller前的MyFilter3-doFilter处理");
        filterChain.doFilter(servletRequest,servletResponse);
        System.out.println("执行Controller后的MyFilter3-doFilter处理");
    }

    @Override
    public void destroy() {
        System.out.println("执行Controller前的MyFilter3-destroy处理");//项目停止的时候执行
    }
}

现在利用FilterRegistrationBean对这三个filter进行注册

@Configuration
public class MyFilterConfig {

    @Bean
    public FilterRegistrationBean FilterRegistrationBean1(){
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.addInitParameter("a","a");  //对filter传递参数，filter可以通filterConfig来获取
        bean.addInitParameter("b","b");
        bean.addInitParameter("c","c");
        bean.setFilter(new MyFilter1());
        bean.addUrlPatterns("/*");//设置需过滤的路径
        bean.setName("filter1");
        bean.setOrder(1);//对order进行排序，数字越小的越先执行
        return bean;
    }

    @Bean
    public FilterRegistrationBean FilterRegistrationBean2(){
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.setFilter(new MyFilter2());
        bean.addUrlPatterns("/*"); 
        bean.setName("filter2");
        bean.setOrder(2); 
        return bean;
    }

    @Bean
    public FilterRegistrationBean FilterRegistrationBean3(){
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.setFilter(new MyFilter3());
        bean.addUrlPatterns("/*");
        bean.setName("filter3");
        bean.setOrder(3);
        return bean;
    }
}

注意：如果order都没有声明（order的默认值是2147483647）：则按加载的顺序，从上至下，依次执行

定义controlle：

@RestController
public class IndexController {

    @RequestMapping(value="/")
    public  String  index(){
        return "index";
    }
}

启动代码：

@SpringBootApplication
public class ShiroPac4jTestApplication {
   public static void main(String[] args) {
      SpringApplication.run(ShiroPac4jTestApplication.class, args);
   }
}

配置文件为：

server.port=8089

项目启动的时候，打印出日志：

执行Controller前的MyFilter1-init处理
执行Controller前的MyFilter2-init处理
执行Controller前的MyFilter3-init处理

请求http://localhost:8089/的时候，打印出日志：

执行Controller前的MyFilter1-doFilter处理
执行Controller前的MyFilter2-doFilter处理
执行Controller前的MyFilter3-doFilter处理
执行Controller后的MyFilter3-doFilter处理
执行Controller后的MyFilter2-doFilter处理
执行Controller后的MyFilter1-doFilter处理

加入filter中filterChain.doFilter(servletRequest,servletResponse);没有写则

则打印日志为：

执行Controller前的MyFilter1-doFilter处理
执行Controller前的MyFilter2-doFilter处理
执行Controller后的MyFilter2-doFilter处理
执行Controller后的MyFilter1-doFilter处理

springboot中FilterRegistrationBean来注册过滤器

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