springboot--拦截器

最新推荐文章于 2024-01-12 23:59:26 发布

jarvis314159

最新推荐文章于 2024-01-12 23:59:26 发布

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分类专栏： springboot 文章标签： java

本文链接：https://blog.youkuaiyun.com/weixin_43283513/article/details/110197979

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本文介绍了一种在SpringMVC框架中使用拦截器的方法，通过实例演示如何拦截除登录接口外的所有请求，并验证用户的登录状态。展示了User类、CommonResponseVo类、UserController类以及自定义拦截器类的具体实现。

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这里以拦截器拦截登录为例，记录拦截器的使用方法

User类：

@Data
@AllArgsConstructor
@NoArgsConstructor
@Component
public class User {
    private Integer id;
    private String name;
}

CommonResponseVo:

@Data
public class CommonResponseVo {
    private String code;
    private String msg;
    private Object data;
}

UserController:

@RestController
@RequestMapping("/user")
public class UserController {
    @GetMapping("/login")
    public String checkLogin(@RequestParam("name") String name,@RequestParam("pwd")String pwd,HttpSession session){
        CommonResponseVo responseVo = new CommonResponseVo();
        if("admin".equals(name) && "123456".equals(pwd)){
            responseVo.setCode("100");
            responseVo.setMsg("登录成功！");
            //这里设置session
            session.setAttribute("loginUser","admin");
            return JSON.toJSONString(responseVo);
        }else{
            responseVo.setCode("-100");
            responseVo.setMsg("登录失败！");
            return JSON.toJSONString(responseVo);
        }
    }
    @GetMapping("/getUserInfo")
    public String getUserInfo(){
        User user = new User(2,"sojrs");
        CommonResponseVo responseVo = new CommonResponseVo();
        responseVo.setCode("100");
        responseVo.setData(user);
        return JSON.toJSONString(responseVo);
    }
}

自定义拦截器类：

@Slf4j
public class LoginHandlerInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //验证session，如果未登录，则拦截该请求
        if("admin".equals(request.getSession().getAttribute("loginUser"))){
            return true;
        }
        log.info("拦截了{}方法",request.getRequestURI());
        return false;
    }
}

WebMvcConfigurer 的实现类：
如果要扩展springmvc的功能，官方建议写一个继承WebMvcConfigurer 的Mvc配置类，实现方法

@Configuration
public class JarvisMvcConfig implements WebMvcConfigurer {
     /**
     * 该方法用于添加拦截器
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //拦截除/user/login方法外的所有请求
        registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**").excludePathPatterns("/user/login");
    }
}

测试：

直接请求/user/getUserInfo

--- [nio-8080-exec-1] c.j.s.config.LoginHandlerInterceptor: 拦截了/user/getUserInfo方法

先请求：/user/login?name=admin&pwd=123456
前端返回:

{
  code: "100",
  msg: "登录成功！"
}

再请求/user/getUserInfo，前端返回，没有被拦截：

{
  code: "100",
  data: {
    id: 2,
    name: "sojrs"
  }
}

方式2：

@Slf4j
@Component   //这里需要加入到spring容器，在WebConfig中使用一个属性装配，并用addInterceptors添加拦截器
public class LoginHandlerInterceptor implements HandlerInterceptor {
    @Autowired
    private RedisUtil redisUtil;  //装配ioc容器中的bean
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        ...
        return true;
    }
}

@Configuration
public class MsgServerWebConfig implements WebMvcConfigurer {
    @Autowired
    private LoginHandlerInterceptor loginHandlerInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //拦截除/user/login方法外的所有请求
        //这里直接添加已经在ioc中的自定义拦截器loginHandlerInterceptor
        registry.addInterceptor(loginHandlerInterceptor).addPathPatterns("/*/**").excludePathPatterns("/user/login");
    }
}

方式3：

@Slf4j
public class HelloInteceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("request={}",request.getRequestURI());
        return true;
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        log.info("postHandle");
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        log.info("afterCompletion");
    }
}

@Configuration
public class HelloMvcConfig  implements WebMvcConfigurer {
    @Autowired
    private HelloInteceptor helloInteceptor;
    
    @Bean
    public HelloInteceptor helloInteceptor(){
        return new HelloInteceptor();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //拦截除/user/login方法外的所有请求
        registry.addInterceptor(helloInteceptor).addPathPatterns("/**");
    }
}