springboot添加過濾器filter和攔截器interceptor

 1、編寫測試類一

package com.lx.filter;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("test")
public class TestController {

    @RequestMapping("/hello")
    public String test1(){
        return "hello";
    }

}

 2、編寫測試類二 

package com.lx.filter;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("aaa")
public class TestController2 {

    @RequestMapping("/hello")
    public String test1(){
        return "hello";
    }
}

  3、編寫過濾器

package com.lx.filter;


import org.springframework.stereotype.Component;

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

@WebFilter(urlPatterns = "/test/*", filterName = "testFilter")
@Component
public class TestFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("過濾器");
        System.out.println("過濾器22222222");
        chain.doFilter(request,response);
    }

    @Override
    public void destroy() {

    }
}

 4、編寫攔截器

package com.lx.intercepter;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
public class Intercepter1 implements HandlerInterceptor {

    //在請求處理之前進行調用（Controller方法調用之前
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        System.out.printf("preHandle被調用");
        return true;  //如果false，停止流程，api被攔截
    }

    //請求處理之後進行調用，但是在視圖被渲染之前（Controller方法調用之後）
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle被調用");
    }

    //在整個請求結束之後被調用，也就是在DispatcherServlet 渲染了對應的視圖之後執行（主要是用於進行資源清理工作）
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("afterCompletion被調用");
    }

}

5、將過濾器和攔截器添加到spring的過濾器和攔截器中

package com.lx.config;

import com.lx.filter.TestFilter;
import com.lx.intercepter.Intercepter1;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.util.ArrayList;
import java.util.List;

@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Autowired
    Intercepter1 intercepter1;

    @Autowired
    TestFilter testFilter;

    // 這個方法是用來配置靜態資源的，比如html，js，css，等等
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry){
        registry.addInterceptor(intercepter1).addPathPatterns("/test/*").excludePathPatterns("/aaa", "/aaa");
        System.out.println(1111);
    }
    @Bean
    FilterRegistrationBean tokenFilter() {
        FilterRegistrationBean filterReg = new FilterRegistrationBean(testFilter);
        //匹配路徑
        List<String> urlPatterns = new ArrayList<>();
//        urlPatterns.add("/*");
        filterReg.addUrlPatterns("/test/*");
        return filterReg;
    }
}

訪問測試

http://localhost:8080/test/hello 被攔截

http://localhost:8080/aaa/hello 不被攔截