SpringBoot+Interceptor 实现对接口请求的拦截

一、导入pom.xml依赖


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


    com.alibaba
    fastjson
    1.2.70

二、创建拦截器实现不同的拦截功能 1.创建拦截器一：登录拦截器

import com.alibaba.fastjson.JSON;
import com.example.springboot_interceptor.base.JsonBean;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.util.WebUtils;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@Component
public class LoginInterceptor implements HandlerInterceptor {
    //在Controller执行之前调用，如果返回false，controller不执行
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {
        System.out.println("访问login拦截***preHandle***");
        // 若不允许访问接口则响应如下具体原因
        
        return true;
    }

    //controller执行之后，且页面渲染之前调用
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("***postHandle***");
    }

    //页面渲染之后调用，一般用于资源清理操作
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("***afterCompletion***");
    }


}

2.创建拦截器二：用户信息获取拦截器

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 UserLoginSessionInterceptor implements HandlerInterceptor {
    //在Controller执行之前调用，如果返回false，controller不执行
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {
        System.out.println("判断用户登录cookie是否失效***preHandle***");
        return true;
    }

    //controller执行之后，且页面渲染之前调用
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
       
    }

    //页面渲染之后调用，一般用于资源清理操作
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
       
    }
}

三、创建接口Controller

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class UserController {
    @RequestMapping("/user")
    @ResponseBody
    public void getUser(){
        System.out.println("执行user");
    }

    @RequestMapping("/userInfo")
    @ResponseBody
    public void getUserInfo(){
        System.out.println("执行userInfo");
    }

    @RequestMapping("/session")
    @ResponseBody
    public void getSession(){
        System.out.println("执行session");
    }

    @RequestMapping("/login")
    @ResponseBody
    public void getLogin(){
        System.out.println("执行Login");
    }
}

四、创建配置信息类

import org.springframework.beans.factory.annotation.Autowired;
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 {
    @Autowired
    LoginInterceptor loginInterceptor;
    @Autowired
    UserLoginSessionInterceptor userLoginSessionInterceptor;

    
    public void addInterceptors(InterceptorRegistry registry){
        //这时如果访问“/login”路径就会触发拦截器
        registry.addInterceptor(loginInterceptor).addPathPatterns("/login");

        //如果需要配置多个拦截器，/userInfo","/session" 是不需要进行校验的
        registry.addInterceptor(userLoginSessionInterceptor).addPathPatterns("/**")
                .addPathPatterns("/login","/user")
                .excludePathPatterns("/userInfo","/session");

    }

}

【说明】

1、以上配置了两个拦截器分别是LoginInterceptor 、UserLoginSessionInterceptor,

2、LoginInterceptor 功能是判断用户请求时是否已登陆，

3、UserLoginSessionInterceptor功能是判断cookie是否正确；

4、其中/login需要进行LoginInterceptor 拦截校验，又需要UserLoginSessionInterceptor拦截校验

5、所有接口都需要进行UserLoginSessionInterceptor校验，其中/userInfo、/session 不需要校验

6.拦截器执行顺序就是配置中的顺序，先执行LoginInterceptor 拦截，再执行UserLoginSessionInterceptor校验

SpringBoot+Interceptor 实现对接口请求的拦截

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