(二)、SpringBoot 自定义 filter(过滤器)

墨蓝 2022-05-30 12:05 457阅读 0赞

可以前往第一篇博客查看目录结构 --> [这里][Link 1]

一、在demo模块 src\\main\\java\\com\\zeke下创建 config、controller、dto、filter目录

![20180312105532497][]

二、在dto包下创建一个User类

public class User {
    
        private String username;
        private String password;
    
        public String getUsername() {
            return username;
        }
    
        public void setUsername(String username) {
            this.username = username;
        }
    
        public String getPassword() {
            return password;
        }
    
        public void setPassword(String password) {
            this.password = password;
        }
    }

三、controller包下创建UserController类

@RestController
    public class UserController {
    
        @GetMapping("/user")
        public List<User> query(@RequestParam(value = "username",defaultValue = "666") String username){
            System.out.println(username);
            List<User> list = new ArrayList<>();
            list.add(new User());
            list.add(new User());
            list.add(new User());
            return list;
        }
    
    }

四、在filter包下创建TimeFilter类,用于自定义filter

@Component
    public class TimeFilter implements Filter {
    
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
            System.out.println("filter init");
        }
    
        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
            System.out.println("filter start");
            long start = new Date().getTime();
            chain.doFilter(request,response);
            System.out.println("filter 耗时： " + (new Date().getTime() - start));
            System.out.println("filter finish");
        }
    
        @Override
        public void destroy() {
            System.out.println("filter destroy");
        }
    }

五、在config包下创建WebConfig类

@Configuration
    public class WebConfig extends WebMvcConfigurerAdapter{
    
        /**
         * 配置自定义过滤器
         * @return
         */
        @Bean
        public FilterRegistrationBean timeFilter(){
            FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
            TimeFilter timeFilter = new TimeFilter();
            filterRegistrationBean.setFilter(timeFilter);
    
            //自定义需要的过滤url
            List<String> list = new ArrayList<>();
            list.add("/*");
            filterRegistrationBean.setUrlPatterns(list);
            return filterRegistrationBean;
        }
    
    }

六、启动项目 输入 localhost/user ，打开IDEA控制台查看效果

![20180312111624543][]

![20180312111634383][]

[Link 1]: http://blog.csdn.net/zeketao/article/details/79522968
[20180312105532497]: /images/20220530/aa035f8f328d4eeca39c643095d6fbbe.png
[20180312111624543]: /images/20220530/695181c440cc4501a49c115aa9b53b35.png
[20180312111634383]: /images/20220530/446ad386b9134e679f7fe338b56e6a3d.png