SpringBoot拦截器实现登录拦截

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

pom.xml：

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.0.0.RELEASE
        
    
    com.wyj
    springboot-interceptor01
    0.0.1-SNAPSHOT
    springboot-interceptor01
    springboot拦截器

    
        1.8
    

    
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            org.springframework.boot
            spring-boot-devtools
            runtime
            true
        

        
        
            org.projectlombok
            lombok
            true
        

        
        
            org.springframework.boot
            spring-boot-starter-thymeleaf
        
    

    
        springboot-interceptor01
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

WebMvcConfigurer：继承WebMvcConfigurationSupport类，重写addInterceptors方法

@Configuration
public class WebMvcConfigurer extends WebMvcConfigurationSupport {

    
//    @Override
//    public void addInterceptors(InterceptorRegistry registry) {
//        
//        registry.addInterceptor(new AuthorityInterceptor())
//                .addPathPatterns("/user
//    @Override
//    public void addInterceptors(InterceptorRegistry registry) {
//        
//        registry.addInterceptor(new AuthorityInterceptor())
//                .addPathPatterns("/user
    @Override
    protected void addInterceptors(InterceptorRegistry registry) {
        
        registry.addInterceptor(new AuthorityInterceptor())
                .addPathPatterns("/user
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object object) throws Exception {
        String uri = request.getRequestURI();
        if (NOT_INTERCEPT_URI.contains(uri)) {
            log.info("不拦截" + uri);
            return true;
        }
        log.info("拦截" + uri);
        HttpSession session = request.getSession();
        UserInfo userInfo = (UserInfo) session.getAttribute("user_info_in_the_session");
        if (userInfo == null) {
            throw new RuntimeException("用户未登陆");
        }
        return true;
    }

    
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object object, ModelAndView mv) throws Exception {
    }

    
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object object, Exception ex) throws Exception {
    }
}

UserController：

@Controller
@RequestMapping(value = "/user")
public class UserController {

    @RequestMapping(value = "/login.html")
    public String index() {
        return "login";
    }

    @RequestMapping(value = "/login")
    public String login(User user) {
        //查询数据库，我这里直接写死
        User dbUser = new User(1, "zhangsan", "123456", "admin");
        if (dbUser.getPassword().equals(user.getPassword())) {
            UserInfo userInfo = new UserInfo(dbUser.getId(), dbUser.getUsername(), dbUser.getRole());
            HttpSession session = getRequest().getSession();
            session.setAttribute("user_info_in_the_session", userInfo);
            return "admin";
        }
        return "login";
    }

    @RequestMapping(value = "/userInfo")
    @ResponseBody
    public String userInfo() {
        HttpSession session = getRequest().getSession();
        UserInfo userInfo = (UserInfo) session.getAttribute("user_info_in_the_session");
        return userInfo.toString();
    }

    private HttpServletRequest getRequest() {
        return ((ServletRequestAttributes) RequestContextHolder.currentRequestAttributes()).getRequest();
    }
}

User：

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User implements Serializable {

    private int id;
    private String username;
    private String password;
    private String role;

}

UserInfo： 用于存在用户信息储存在session中

@Data
@NoArgsConstructor
@AllArgsConstructor
public class UserInfo implements Serializable {

    private int id;
    private String username; 
    private String role;

}

login.html：只是一个很简单的登录表单

    
    



    登陆：

    用户名：

    密   码：

    

admin.html：