?2016-2026 Matools All rights reserved,
粵ICP備17059708號
過濾器（Filter）是Servlet中常用的技術，可以實現用戶在訪問某個目標資源之前，對訪問的請求和響應進行攔截，常用的場景有登錄校驗、權限控制、敏感詞過濾等，下面介紹下Spring
Boot配置過濾器的兩種方式。
本文目錄
一、@WebFilter注解方式 <https://www.cnblogs.com/haha12/p/11472582.html#hwebfilter>
二、@Bean注解方式 <https://www.cnblogs.com/haha12/p/11472582.html#hbean>三、查看運行效果
<https://www.cnblogs.com/haha12/p/11472582.html#h-1>
一、@WebFilter注解方式
使用@WebFilter注解為聲明當前類為filter，第一個參數為該filter起一個名字，第二個參數為說明要攔截的請求地址，當前類需要實現Filter接口，里面有三個方法，分別為過濾器初始化、過濾方法和過濾器銷毀。
@Slf4j
@WebFilter(filterName?=?"myFilter1",?urlPatterns?=?"/*")
public?class?MyFilter1?implements?Filter?{
????@Override
????public?void?init(FilterConfig?filterConfig)?throws?ServletException?{
????????log.info(filterConfig.getFilterName()?+?"?init");
????}
????@Override
????public?void?doFilter
(ServletRequest?request,?ServletResponse?response,?FilterChain?chain)?{
????????log.info("myFilter1?begin");
????????try?{
????????????log.info("業(yè)務方法執(zhí)行");
????????????chain.doFilter(request,?response);
????????}?catch?(Exception?e)?{
????????????log.error("error!",?e);
????????}
????????log.info("myFilter1?end");
????}
????@Override
????public?void?destroy()?{
????}
}
啟動類添加@ServletComponentScan注解，@ServletComponentScan注解所掃描的包路徑必須包含該Filter，代碼如下：
@SpringBootApplication
@ServletComponentScan(basePackages?=?"com.example.demo.filter")
public?class?DemoApplication?{
????public?static?void?main(String[]?args)?{
????????SpringApplication.run(DemoApplication.class,?args);
????}
}
二、@Bean注解方式
新建MyFilter2.java類，不要加注解@WebFilter，代碼如下：
@Slf4j
public?class?MyFilter2?implements?Filter?{
????@Override
????public?void?init(FilterConfig?filterConfig)?throws?ServletException?{
????????log.info(filterConfig.getFilterName()?+?"?init");
????}
????@Override
????public?void?doFilter
(ServletRequest?request,?ServletResponse?response,?FilterChain?chain)?{
????????log.info("myFilter2?begin");
????????try?{
????????????log.info("業(yè)務方法執(zhí)行");
????????????chain.doFilter(request,?response);
????????}?catch?(Exception?e)?{
????????????log.error("error!",?e);
????????}
????????log.info("myFilter2?end");
????}
????@Override
????public?void?destroy()?{
????}
}
新建配置類WebConfig.java，配置bean，代碼如下：
@Configuration
public?class?WebConfig?{
????@Bean
????public?FilterRegistrationBean?testFilterRegistration()?{
????????FilterRegistrationBean?registration?=?new?FilterRegistrationBean(new
?MyFilter2());
????????registration.addUrlPatterns("/test");?//
????????registration.setName("myFilter2");
????????return?registration;
????}
}
三、查看運行效果
項目啟動后瀏覽器訪問http://localhost:8080/test，可以看到過濾器已生效，后臺打印日志如下：
[nio-8080-exec-1]?com.example.demo.filter.MyFilter1????????:?myFilter1?begin
[nio-8080-exec-1]?com.example.demo.filter.MyFilter1????????:?業(yè)務方法執(zhí)行
[nio-8080-exec-1]?com.example.demo.filter.MyFilter1????????:?myFilter1?end?
到此Spring Boot配置過濾器的兩種方式已經全部實現，有問題歡迎留言溝通哦！
完整源碼地址： https://github.com/suisui2019/springboot-study
推薦閱讀
1.Spring Boot統(tǒng)一異常處理實戰(zhàn) <https://mp.weixin.qq.com/s/ppgFzmqMdeLuPWWtRnB-yw>
2.從技術的角度分析下為什么不要在網上發(fā)“原圖” <https://mp.weixin.qq.com/s/K4ACjz905e1XWgQQcTK-yw>
3.利用Spring Boot+zxing，生成二維碼還能這么簡單
<https://mp.weixin.qq.com/s/e59SJFP87OX8pOIrFGMAEw>
4.Spring Boot之Profile--快速搞定多環(huán)境使用與切換
<https://mp.weixin.qq.com/s/7vTGRexb3Kydn9f80k0LlQ>
5.利用Spring Boot+WxJava實現網站集成微信登錄功能
<https://mp.weixin.qq.com/s/Qfmt87EfoeIN-XrqTSikig>
限時領取免費Java相關資料，涵蓋了Java、Redis、MongoDB、MySQL、Zookeeper、Spring
Cloud、Dubbo/Kafka、Hadoop、Hbase、Flink等高并發(fā)分布式、大數據、機器學習等技術。
關注下方公眾號即可免費領取：
Java碎碎念公眾號
?
熱門工具 換一換