1. 創建 Filter 類，實現 Fitler接口

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

/**
 * @Auther: Dandwj
 * @Date: 2019/3/20 23:00
 * @Description: 
 */
@WebFilter(filterName = "myFilter",urlPatterns = "/login/*")
public class AuthorFilter implements Filter {
    
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //處理請求
        
        filterChain.doFilter(servletRequest, servletResponse);
    }
    @Override
    public void destroy() {

    }
}
 

然後加上 @WebFilter 註解

2. 在啟動類上加上@ServletComponentScan(basePackages = "pers.dandwj.cheerful.service")註解 MyFilter 是在 basePackages包下

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
@ServletComponentScan(basePackages = "pers.dandwj.cheerful.service")
public class CheerfulWxApiApplication {

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

}

擴展：

三種攔截器比較：

• Filter 是 java web 裏面的，肯定獲取不到 spring 裏面 Controller 的信息。
• Interceptor、Aspect 是和 spring 相關的，所以能獲取到 Controller 的信息。

springboot 使用Filter