添加自定义注解
package org.book.configuration.aop; import java.lang.annotation.*; @Documented @Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) public @interface NoCheckLogin { }
创建一个SpringMvcHandler 类,继承HandlerInterceptorAdapter
package org.book.configuration.Handler; import com.alibaba.fastjson.JSONObject; import lombok.extern.slf4j.Slf4j; import org.book.common.JsonResult; import org.book.configuration.aop.NoCheckLogin; import org.springframework.web.method.HandlerMethod; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.handler.HandlerInterceptorAdapter; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.PrintWriter; import java.lang.reflect.Method; @Slf4j public class SpringMvcHandler extends HandlerInterceptorAdapter { public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3) throws Exception { } public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3) throws Exception { } public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { HandlerMethod hm = null; Method method = null; if(handler instanceof HandlerMethod) { hm = (HandlerMethod) handler; method = hm.getMethod();// 获取方法 } else { return true; } // 该方法是否添加 允许未登录访问注解 if (method !=null && method.isAnnotationPresent(NoCheckLogin.class)) { // 不拦截 return true; } String name = (String) request.getSession().getAttribute("user"); if (name != null) { return true; } else { response.setCharacterEncoding("UTF-8"); response.setContentType("application/json; charset=utf-8"); PrintWriter out = null; try { out = response.getWriter(); out.append(new JSONObject().toJSONString(JsonResult.renderFail("用户未登录")) ); }catch (Exception e){ out = response.getWriter(); out.append(new JSONObject().toJSONString(JsonResult.renderError("后台出错"))); log.info(e.getStackTrace().toString()); } return false; } } }
被@NoLoginCheck注解的方法不会被拦截在springmvc配置文件配置拦截路径和排除路径
<mvc:interceptors> <mvc:interceptor> <mvc:mapping path="/**"/> <mvc:mapping path="/"/> <mvc:mapping path="/index.jsp"/> <mvc:exclude-mapping path="/assets/**"/> <mvc:exclude-mapping path="/images/**"/> <bean class="org.book.configuration.Handler.SpringMvcHandler"></bean> </mvc:interceptor> </mvc:interceptors>
1)预处理preHandle()方法
用户发送请求时,先执行preHandle()方法。会先按照顺序执行所有拦截器的preHandle方法,一直遇到return false为止,比如第二个preHandle方法是return false,则第三个以及以后所有拦截器都不会执行。若都是return true,则执行用户请求的url方法。
2)后处理postHandle()
方法调用了Service并返回ModelAndView,但未进行页面渲染,可以在这里继续修改ModelAndView
3)返回处理afterCompletion()
方法已经渲染了页面,在afterCompletion中,可以根据ex是否为null判断是否发生了异常,进行日志记录。注:一般使用preHandle这个拦截器进行预处理,对url进行请求拦截
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