SpringBoot 优雅的配置拦截器方式

步骤：

1.实现WebMvcConfigurer配置类

2.实现拦截器

3. 把拦截器添加到配置中

4.添加需要拦截的请求

5.添加需要排除的请求

package com.zp.springbootdemo.interceptor;

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.WebMvcConfigurer;

/**
 * 和springmvc的webmvc拦截配置一样
 * @author zp
 */
@Configuration
public class WebConfigurer implements WebMvcConfigurer {
    /**
     * 拦截器配置
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // addPathPatterns拦截所有请求,excludePathPatterns排除特殊的请求
        //registry.addInterceptor(LoginInterceptor()).addPathPatterns("/**");
        registry.addInterceptor(AuthorityInterceptor()).addPathPatterns("/**");
        //excludePathPatterns 排除的请求
//        registry.addInterceptor(LoginInterceptor()).addPathPatterns("/**").excludePathPatterns("/user/**");
//        registry.addInterceptor(AuthorityInterceptor()).addPathPatterns("/**").excludePathPatterns("/user/**");
    }
    /**
     * 拦截器一
     * @return
     */
    @Bean
    public LoginInterceptor LoginInterceptor() {
        return new LoginInterceptor();
    }
    /**
     * 拦截器二
     * @return
     */
    @Bean
    public AuthorityInterceptor AuthorityInterceptor() {
        return new AuthorityInterceptor();
    }
}

基于URL实现的拦截器：

package com.zp.springbootdemo.interceptor;

import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

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

public class LoginInterceptor extends HandlerInterceptorAdapter {
    /**
     * 在请求处理之前进行调用（Controller方法调用之前）
     * 基于URL实现的拦截器
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String path = request.getServletPath();
        System.out.println("当前请求路径："+path);
        System.out.println("=========进入拦截器1===================");
        if (path.matches(Const.NO_INTERCEPTOR_PATH)) {
            //不需要的拦截直接过
            System.out.println("=========无需拦截===================");
            return true;
        } else {
            System.out.println("=========开始拦截===================");
            // 这写你拦截需要干的事儿，比如取缓存，SESSION，权限判断等
            String token = request.getParameter("token");
            if(token == null){
                System.out.println("=========拦截完成==================="+false);
                return false;
            }
            System.out.println("=========拦截完成==================="+true);
            return true;
        }
    }
}

关键代码：path.matches(Const.NO_INTERCEPTOR_PATH 就是基于正则匹配的url。

package com.zp.springbootdemo.interceptor;

/**
 * @author   zp
 * @explain 常量类
 */
public class Const {

    public static final String SUCCESS = "SUCCESS";
    public static final String ERROR = "ERROR";
    public static final String FIALL = "FIALL";
    /**********************对象和个体****************************/
    public static final String SESSION_USER = "loginedAgent"; // 用户对象
    public static final String SESSION_LOGINID = "sessionLoginID"; // 登录ID
    public static final String SESSION_USERID = "sessionUserID"; // 当前用户对象ID编号

    public static final String SESSION_USERNAME = "sessionUserName"; // 当前用户对象ID编号
    public static final Integer PAGE = 10; // 默认分页数
    public static final String SESSION_URL = "sessionUrl"; // 被记录的url
    public static final String SESSION_SECURITY_CODE = "sessionVerifyCode"; // 登录页验证码
    // 时间 缓存时间
    public static final int TIMEOUT = 1800;// 秒
    public static final String ON_LOGIN = "/logout.htm";
    public static final String LOGIN_OUT = "/toLogout";
    // 不验证URL anon：不验证/authc：受控制的
    public static final String NO_INTERCEPTOR_PATH =".*/((.css)|(.js)|(images)|(login)|(anon)).*";
}

测试：

请求地址：http://127.0.0.1:8080/user/getUser?token=123

结果：

基于注解的拦截器

①创建注解：

package com.zp.springbootdemo.interceptor;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * 在需要登录验证的Controller的方法上使用此注解
 */
@Target({ElementType.METHOD})// 可用在方法名上
@Retention(RetentionPolicy.RUNTIME)// 运行时有效
public @interface LoginRequired {

}

②创建拦截器：

package com.zp.springbootdemo.interceptor;

import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

public class AuthorityInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("===============进入拦截器2=====================");
        // 如果不是映射到方法直接通过
        if (!(handler instanceof HandlerMethod)) {
            System.out.println("===============无需拦截=====================");
            return true;
        }
        // ①:START 方法注解级拦截器
        HandlerMethod handlerMethod = (HandlerMethod) handler;
        Method method = handlerMethod.getMethod();
        // 判断接口是否需要登录
        LoginRequired methodAnnotation = method.getAnnotation(LoginRequired.class);
        // 有 @LoginRequired 注解，需要认证
        if (methodAnnotation != null) {
            // 这写你拦截需要干的事儿，比如取缓存，SESSION，权限判断等
            System.out.println("===============开始拦截=====================");
            String token = request.getParameter("token");
            if(token == null){
                System.out.println("=========拦截完成==================="+false);
                return false;
            }
            System.out.println("=========拦截完成==================="+true);
            return true;
        }
        System.out.println("===============无需拦截===================");
        return true;
    }
}

测试接口代码1：

package com.zp.springbootdemo.system.controller;

import com.zp.springbootdemo.interceptor.LoginRequired;
import com.zp.springbootdemo.system.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.Map;

@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;

    @GetMapping("/getUser")
    //@LoginRequired
    public Map<String,String> getUser(@RequestParam Map<String,String> user){
       return userService.getUser(user);
    }
}

请求地址：

http://127.0.0.1:8080/user/getUser?token=123

结果：

测试接口代码2：

package com.zp.springbootdemo.system.controller;

import com.zp.springbootdemo.interceptor.LoginRequired;
import com.zp.springbootdemo.system.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.Map;

@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;

    @GetMapping("/getUser")
    @LoginRequired
    public Map<String,String> getUser(@RequestParam Map<String,String> user){
       return userService.getUser(user);
    }
}

请求地址：

http://127.0.0.1:8080/user/getUser?token=123

结果：