springboot中使用filter

通过注解的方式实现filter过滤器。

创建Filter包，并在该包下创建MyFilter

示例代码：

package com.bjpowernode.springboot.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

@WebFilter(urlPatterns = "/*")
public class MyFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("您的请求已经进入MyFilter过滤器……");
       filterChain.doFilter(servletRequest,servletResponse);
    }
}

注意需要加注解，配置需要拦截哪些路径。过滤的逻辑在输出语句处实现。并且如果不阻断请求，需要让请求过滤链继续。

需要在启动类上加包扫描注解，代码如下：

package com.bjpowernode.springboot;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@SpringBootApplication
@MapperScan("com.bjpowernode.springboot.mapper") //取代在mapper接口上配置的@Mapper
@ServletComponentScan(basePackages = {"com.bjpowernode.springboot.servlet",
"com.bjpowernode.springboot.filter"})//扫描Servlet包   扫描filter包
@EnableTransactionManagement //开启事务支持
public class WebApplication {

    public static void main(String[] args) {
        SpringApplication.run(WebApplication.class, args);
    }

}

注解：@ServletComponentScan是扫描包的。