spring boot——请求与参数校验——重要概念——拦截器——华章

标签：拦截器 华章 spring springframework org import interceptor servlet public

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("/**");
    }

}

 

 

 

 

 

 

 

 

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");
    }

}

 

 

 

 

 

 

 

 

 

 

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");
    }
}

 

 

 

 

 

 

 

 

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");
    }
}

 

 

 

 

 

 

 

 

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
    }
}

 

 

 

 

 

 

 

 

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";
    }

}

 

 

 

 

 

 

 

 

 

 

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);

    }
}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

标签：拦截器,华章,spring,springframework,org,import,interceptor,servlet,public
From： https://www.cnblogs.com/xiaobaibailongma/p/17065182.html