SpringBoot配置拦截器方式实例代码

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;


@Configuration
public class WebConfigurer implements WebMvcConfigurer {
  
  @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("
  @Bean
  public LoginInterceptor LoginInterceptor() {
    return new LoginInterceptor();
  }
  
  @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 {
  
  @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;


public class Const {

 public static final String SUCCESS = "SUCCESS";
 public static final String ERROR = "ERROR";
 public static final String FIALL = "FIALL";
 
 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;


@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 getUser(@RequestParam Map user){
  return userService.getUser(user);
 }
}

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 getUser(@RequestParam Map user){
  return userService.getUser(user);
 }
}

请求地址：

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

结果：

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