Spring Boot的filter(过滤器)简单使用实例详解
过滤器(Filter)的注册方法和 Servlet 一样,有两种方式:代码注册或者注解注册
1.代码注册方式
通过代码方式注入过滤器
@Bean public FilterRegistrationBean indexFilterRegistration() { FilterRegistrationBean registration = new FilterRegistrationBean(new IndexFilter()); registration.addUrlPatterns("/"); return registration; }
IndexFilter.Java类:
package com.example.filter; import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; public class IndexFilter implements Filter{ @Override public void destroy() { System.out.println("filter destroy method"); } @Override public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException { System.out.println("filter doFilter method"); } @Override public void init(FilterConfig arg0) throws ServletException { System.out.println("filter init method"); } }
2.注解方式
通过注解方式注入过滤器
IndexFilter2.java类
package com.example.filter; import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.annotation.WebFilter; @WebFilter(urlPatterns = "/*", filterName = "indexFilter2") public class IndexFilter2 implements Filter{ @Override public void destroy() { System.out.println("filter2 destroy method"); } @Override public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException { System.out.println("filter2 doFilter method"); } @Override public void init(FilterConfig arg0) throws ServletException { System.out.println("filter2 init method"); } }
把注解加到入口处启动即可
@SpringBootApplication @ServletComponentScan public class SpringBootSimpleApplication { public static void main(String[] args) { SpringApplication.run(SpringBootSimpleApplication.class, args); } }
以上所述是小编给大家介绍的Spring Boot的filter(过滤器)简单使用,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对我们网站的支持!
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