在Java教程中大家会学到spring boot拦截器的配置,其实spring boot拦截器的配置方式和spring MVC类似。只需要注意一些小的变化。下面介绍两种常用的拦截器:
public class LoginInterceptor extends HandlerInterceptorAdapter{
/**
* Call before request processing (before Controller method call)
* Interceptor Based on URL
* @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();
if (path.matches(Const.NO_INTERCEPTOR_PATH)) {
//No need to intercept directly
return true;
} else {
// This describes the things you need to do to intercept, such as fetching cache, SESSION, permission judgment, etc
System.out.println("====================================");
return true;
}
}
}
关键代码:path.matches(const.no'intersector'path是基于正则匹配的url。
/**
* @author BianP
* @explain Constant class
*/
public class Const {
public static final String SUCCESS = "SUCCESS";
public static final String ERROR = "ERROR";
public static final String FIALL = "FIALL";
/**********************Objects and individuals****************************/
public static final String SESSION_USER = "loginedAgent"; // User object
public static final String SESSION_LOGINID = "sessionLoginID"; // Login ID
public static final String SESSION_USERID = "sessionUserID"; // Current user object ID number
public static final String SESSION_USERNAME = "sessionUserName"; // Current user object ID number
public static final Integer PAGE = 10; // Default page number
public static final String SESSION_URL = "sessionUrl"; // Recorded url
public static final String SESSION_SECURITY_CODE = "sessionVerifyCode"; // Login page verification code
// Time cache time
public static final int TIMEOUT = 1800;// second
public static final String ON_LOGIN = "/logout.htm";
public static final String LOGIN_OUT = "/toLogout";
// Do not validate URL anon: do not validate / authc: controlled
public static final String NO_INTERCEPTOR_PATH =".*/((.css)|(.js)|(images)|(login)|(anon)).*";
}
(1)创建注解:
/**
* Use this annotation on the method of the Controller that requires login authentication
*/
@Target({ElementType.METHOD})// Available on method name
@Retention(RetentionPolicy.RUNTIME)// Valid at run time
public @interface LoginRequired {
}
(2)创建拦截器:
public class AuthorityInterceptor extends HandlerInterceptorAdapter{
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
// If it is not mapped to a method directly through
if (!(handler instanceof HandlerMethod)) {
return true;
}
// ①: START method annotation level interceptor
HandlerMethod handlerMethod = (HandlerMethod) handler;
Method method = handlerMethod.getMethod();
// Determine whether the interface needs to be logged in
LoginRequired methodAnnotation = method.getAnnotation(LoginRequired.class);
// With @ LoginRequired annotation, authentication is required
if (methodAnnotation != null) {
// This describes the things you need to do to intercept, such as fetching cache, SESSION, permission judgment, etc
System.out.println("====================================");
return true;
}
return true;
}
}
(3)在配置中添加拦截器,相当于spring MVC中配置文件的作用:
/**
* The same webmvc interception configuration as spring MVC
* @author BIANP
*/
@Configuration
public class WebMvcConfigurer extends WebMvcConfigurationSupport {
@Override
public void addInterceptors(InterceptorRegistry registry) {
// Block all requests, and determine whether login is required by judging whether there is @ LoginRequired annotation
registry.addInterceptor(LoginInterceptor()).addPathPatterns("/**");
registry.addInterceptor(AuthorityInterceptor()).addPathPatterns("/**");
super.addInterceptors(registry);
}
@Bean
public LoginInterceptor LoginInterceptor() {
return new LoginInterceptor();
}
@Bean
public AuthorityInterceptor AuthorityInterceptor() {
return new AuthorityInterceptor();
}
}
一定要添加@Configuration注解,它会在启动时加载。
其实spring MVC的很多东西都可以用在spring boot中。只需将Configuration文件的模式改为对应的@Configuration类即可。如果大家想了解更多相关知识,不妨来关注一下极悦的SpringBoot教程,里面的课程内容更加丰富,相信对大家的学习一定会有所帮助的。
你适合学Java吗?4大专业测评方法
代码逻辑 吸收能力 技术学习能力 综合素质
先测评确定适合在学习