出自:http://www.jb51.net/article/113389.htm
前言
传统的javaEE增加Filter是在web.xml中配置,如以下代码:
<filter> <filter-name>TestFilter</filter-name> <filter-class>com.cppba.filter.TestFilter</filter-class> </filter> <filter-mapping> <filter-name>TestFilter</filter-name> <url-pattern>/*</url-pattern> <init-param> <param-name>paramName</param-name> <param-value>paramValue</param-value> </init-param> </filter-mapping>
然而spring-boot中很明显不能这样实现,那怎么办呢?看完下面的教程,答案自然知道了。
老方法(新方法请直接下拉)
1.创建自定义Filter
package com.cppba.filter; import javax.servlet.*; import java.io.IOException; public class TestFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("TestFilter"); } @Override public void destroy() { } }
2.在ApplicationConfiguration.java中增加一个@bean
@Bean public FilterRegistrationBean testFilterRegistration() { FilterRegistrationBean registration = new FilterRegistrationBean(); registration.setFilter(new TestFilter()); registration.addUrlPatterns("/*"); registration.addInitParameter("paramName", "paramValue"); registration.setName("testFilter"); registration.setOrder(1); return registration; }
3.启动项目
你会看到控制台打印如下代码:
4.访问项目
最后我们访问以下http://127.0.0.1:8080/test
如果你看到控制台打印出:TestFilter
恭喜你,配置成功!
2017-04-20 最新spring-boot增加Filter方法
首先定义一个Filter
@Order(1) //重点 @WebFilter(filterName = "testFilter1", urlPatterns = "/*") public class TestFilterFirst implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("TestFilter1"); filterChain.doFilter(servletRequest,servletResponse); } @Override public void destroy() { } }
比较核心的代码是自定义类上面加上@WebFilter,其中@Order注解表示执行过滤顺序,值越小,越先执行
我们在spring-boot的入口处加上如下注解@ServletComponentScan:
@SpringBootApplication(scanBasePackages = "com.cppba") //重点 @ServletComponentScan public class Application { public static void main(String[] args) throws UnknownHostException { SpringApplication app = new SpringApplication(Application.class); Environment environment = app.run(args).getEnvironment(); } }
这种方法效果和上面版本一样,但是用起来更加方便!