springboot 配置servlet filter

1.pom文件

    
		org.springframework.boot
		spring-boot-starter-parent
		1.5.2.RELEASE
	

	
		
		
		
			org.springframework.boot
			spring-boot-starter-web
		
	

2.servlet 类

package com.knife.test;

import java.io.IOException;

import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;

@WebServlet(urlPatterns = "/test")
public class TestServlet implements Servlet{

	@Override
	public void init(ServletConfig config) throws ServletException {
		// TODO Auto-generated method stub
		
	}

	@Override
	public ServletConfig getServletConfig() {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {
		// TODO Auto-generated method stub
		res.getWriter().print("hello ...");
	}

	@Override
	public String getServletInfo() {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}

}

3.filter 类

package com.knife.test;

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 = "/test")
public class TestFilter implements Filter {

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		// TODO Auto-generated method stub
		System.out.println("filter work ...");
		chain.doFilter(request, response);
	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}

}

4.启动类，加上@ServletComponentScan(如果不加参数则默认扫描启动类所在包，参数例子@ServletComponentScan(value = "com.knife"))

package com.knife.test;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;


@ServletComponentScan
@SpringBootApplication
public class App 
{
	
	
    public static void main( String[] args )
    {
    	SpringApplication.run(App.class, args);
    }
    
	
}

5.执行效果