spring boot——请求与参数校验——重要概念——拦截器——华章

叁歲伎倆 2023-09-29 00:31 3阅读 0赞

拦截器注册：

package org.example.interceptor_hz.config;
    
    import org.example.interceptor_hz.interceptor.FirstHandlerInterceptor;
    import org.example.interceptor_hz.interceptor.SecondHandlerInterceptor;
    import org.example.interceptor_hz.service.IndexService;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    @Configuration
    public class InterceptorConfig implements WebMvcConfigurer 
    {
    
        @Override
        public void addInterceptors(InterceptorRegistry registry) 
        {
            
            FirstHandlerInterceptor firstHandlerInterceptor = new FirstHandlerInterceptor(new IndexService());
            
            registry.addInterceptor(firstHandlerInterceptor).addPathPatterns("/**");
            
            
            
            SecondHandlerInterceptor secondHandlerInterceptor = new SecondHandlerInterceptor();
            
            registry.addInterceptor(secondHandlerInterceptor).addPathPatterns("/**");
        }
    
    }

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IndexService

package org.example.interceptor_hz.service;
    
    import org.springframework.stereotype.Service;
    
    @Service
    public class IndexService {
    
        public void testIndex()
        {
    
            System.out.println("执行service");
        }
    
    }

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拦截器一：

package org.example.interceptor_hz.interceptor;
    
    import org.example.interceptor_hz.service.IndexService;
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    public class FirstHandlerInterceptor implements HandlerInterceptor {
    
        private IndexService indexService;
    
        public FirstHandlerInterceptor(IndexService indexService){
            this.indexService = indexService;
        }
    
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            System.out.println("FirstHandlerInterceptor正在执行preHandle");
            return true;
        }
    
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
            indexService.testIndex();
            System.out.println("FirstHandlerInterceptor正在执行postHandle");
        }
    
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
            System.out.println("FirstHandlerInterceptor正在执行afterCompletion");
        }
    }

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拦截器二：

package org.example.interceptor_hz.interceptor;
    
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    public class SecondHandlerInterceptor implements HandlerInterceptor
    {
    
    
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception
        {
    
            System.out.println("SecondHandlerInterceptor正在执行preHandle");
            return true;
        }
    
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception
        {
    
            System.out.println("SecondHandlerInterceptor正在执行postHandle");
        }
    
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception
        {
    
            System.out.println("SecondHandlerInterceptor正在执行afterCompletion");
        }
    }

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过滤器：

package org.example.interceptor_hz;
    
    import javax.servlet.*;
    import javax.servlet.annotation.WebFilter;
    import java.io.IOException;
    
    @WebFilter("/*")
    public class IndexFilter implements Filter
    {
    
        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException
        {
    
            System.out.println("IndexFilter已执行");
    
            filterChain.doFilter(servletRequest, servletResponse);//放行
        }
    }

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访问：

package org.example.interceptor_hz.web;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class IndexController
    {
        @RequestMapping("/interceptorIndex")
        public String index()
        {
    
            System.out.println("执行index");
            return "welcome to my site";
        }
    
    }

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package org.example;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    
    
    @SpringBootApplication
    @ServletComponentScan({
         "org.example.webFilter","org.example.interceptor_hz"})
    public class HelloWorldApplication
    {
    
        public static void main(String[] args)
        {
    
            SpringApplication.run(HelloWorldApplication.class, args);
    
        }
    }

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