SpringBoot拦截器实现登录拦截的示例代码_Java教程

SpringBoot拦截器实现登录拦截的示例代码

2022-10-23 16:31C'z x Java教程

本文主要介绍了SpringBoot拦截器实现登录拦截，文中根据实例编码详细介绍的十分详尽，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

可以对URL路径进行拦截，可以用于权限验证、解决乱码、操作日志记录、性能监控、异常处理等

SpringBoot拦截器实现登录拦截的示例代码

实现代码

新建 interceptor包

SpringBoot拦截器实现登录拦截的示例代码

添加拦截器代码

package com.qcby.interceptor;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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

public class LoginInterceptor  implements HandlerInterceptor {

  @Autowired
  private HttpSession httpSession;
  //Controller逻辑执行之前
  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
      System.out.println("preHandle....");
      String uri = request.getRequestURI();
      System.out.println("当前路径"+uri);

      /**
       * HandlerMethod=>Controller中标注@RequestMapping的方法
       *  需要配置静态资源不拦截时，添加这块逻辑  => 前后端分离项目
       */
      if (!(handler instanceof HandlerMethod)) {
          return true;
      }
      if (httpSession.getAttribute("username") == null) {
          // 未登录跳转到登录界面
          throw  new RuntimeException("no login!");
      } else {
          return true;
      }
  }

  //Controller逻辑执行完毕但是视图解析器还未进行解析之前
  @Override
  public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
      System.out.println("postHandle....");
  }

  //Controller逻辑和视图解析器执行完毕
  @Override
  public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
      System.out.println("afterCompletion....");
  }
}

SpringBoot拦截器实现登录拦截的示例代码

package com.qcby.config;

import com.qcby.interceptor.LoginInterceptor;
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 WebMvcConfig implements WebMvcConfigurer {

  @Override
  public void addInterceptors(InterceptorRegistry registry) {
      registry.addInterceptor(loginInterceptor())
              .addPathPatterns("/**")
              // 那些路径不拦截
              .excludePathPatterns("/user/login","/error");
  }

  @Bean
  public LoginInterceptor loginInterceptor(){
      return new LoginInterceptor();
  }
}

实现类

@RestController
@RequestMapping("user")
public class UserController {
@Autowired
  private UserService userService;
  @Autowired
  private HttpSession session;
  @ApiOperation("用户登录接口")
  @RequestMapping(value="login",method = {RequestMethod.GET,RequestMethod.POST})
  public Map<String,Object>login(User user){
      Map<String,Object> map=new HashMap<>();
      map.put("code",0);
      if(StringUtils.isEmpty(user.getUsername())||StringUtils.isEmpty(user.getPassword())){
          map.put("msg","用户或密码为空！");
          return map;
      }
      QueryWrapper<User> queryWrapper=new QueryWrapper<>();
      queryWrapper.eq("username",user.getUsername())
              .eq("password",user.getPassword());
      User user1=userService.getOne(queryWrapper);
      if(user1!=null){
          map.put("cod",1);
          map.put("data",user1);
          session.setAttribute("username",user1.getUsername());
      }else {
          map.put("msg","用户名或密码错误!");
      }
      return map;
  }
}

当我们未登录时我们不能进入拦截的页面

SpringBoot拦截器实现登录拦截的示例代码