SpringBoot實戰之6 注冊filter和listener

應用場景

在項目中有些特殊的處理需要用到過濾器及監聽器，比如spring架構得字元過濾器CahracterEncodingFilter。

code實作

MyFilter.java

@WebFilter(urlPatterns = "/*",description = "自定義filter")
public class MyFilter implements Filter {
    private final Logger _logger = LoggerFactory.getLogger(this.getClass());
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        _logger.info("MyFilter init ...");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        _logger.info("處理 filter 業務 ...");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {
        _logger.info("MyFilter destroy ...");
    }
}
           

MyListener.java

@WebListener
public class MyListener implements ServletContextListener {
    private final Logger _logger = LoggerFactory.getLogger(this.getClass()) ;
    @Override
    public void contextInitialized(ServletContextEvent servletContextEvent) {
        _logger.info("contextInitialized");
        _logger.info(servletContextEvent.getServletContext().getContextPath());
    }
    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {
        _logger.info("contextDestroyed");
    }
}
           

程式入口 SpringBootFilterListenerApplication.java

@SpringBootApplication
@ServletComponentScan({
        "com.hsy.springboot.filter.listener.filter",
        "com.hsy.springboot.filter.listener.listener"
})
public class SpringBootFilterListenerApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringBootFilterListenerApplication.class,args);
    }
}
           

結果展示

項目結構圖

曆史文章

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springboot實戰之整合freemarker模版引擎

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