springboot拦截器

1.创建拦截类实现HandlerInterceptor

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

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.pengsheng.bugcollect.po.PersonInfo;

public class loginFilter implements HandlerInterceptor{
	
	@Override
    public void afterCompletion(HttpServletRequest request,
                                HttpServletResponse response, Object obj, Exception err)
            throws Exception {
		
    }

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

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object obj) throws Exception {
        //获取session里的登录状态值
    	PersonInfo str = (PersonInfo) request.getSession().getAttribute("personInfo");
           //如果登录状态不为空则返回true，返回true则会执行相应controller的方法
           if (str != null) {
               return true;
            }
           //如果登录状态为空则重定向到登录页面，并返回false，不执行原来controller的方法
          response.sendRedirect("/initLogin.action");
          return false;
    }
}

　　2.编写InterceptorConfigurerAdapter类继承WebMvcConfigurerAdapter

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@Configuration
public class InterceptorConfigurerAdapter extends WebMvcConfigurerAdapter {
    /**
     * 该方法用于注册拦截器
     * 可注册多个拦截器，多个拦截器组成一个拦截器链
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // addPathPatterns 添加路径
        // excludePathPatterns 排除路径
        registry.addInterceptor(new loginFilter()).addPathPatterns("/*.*").excludePathPatterns("/initLogin.action", "/jsp/login.jsp","/login.action");
        super.addInterceptors(registry);
    }
}