javaweb添加拦截器

js请求后台代码添加拦截器：

package com.ctzj.biz.isale.deploy.controller;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.util.Date;

import java.util.List;

import java.util.Map;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.apache.curator.utils.ZKPaths;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.bind.annotation.RestController;

import org.springframework.web.context.request.RequestContextHolder;

import org.springframework.web.context.request.ServletRequestAttributes;

import org.springframework.web.servlet.config.annotation.InterceptorRegistry;

import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;

import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;

import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import org.springframework.web.socket.WebSocketSession;

import com.ctzj.biz.isale.deploy.config.ApplicationProperties;

import com.ctzj.biz.isale.deploy.model.Menu;

import com.ctzj.biz.isale.deploy.model.ResponseResult;

import com.ctzj.biz.isale.deploy.model.dataobject.DeployConfigDo;

import com.ctzj.biz.isale.deploy.model.query.DeployConfigQuery;

import com.ctzj.biz.isale.deploy.service.DeployConfigService;

import com.ctzj.biz.isale.deploy.service.MenuConfigService;

import com.ctzj.biz.isale.deploy.util.Interceptor;

import com.google.common.collect.Lists;

import com.google.common.collect.Maps;

@RestController

@RequestMapping(value = "/dispatcher")

public class DispatcherController extends WebMvcConfigurerAdapter{

    @Autowired

    private DeployConfigService deployConfigService;

    @Autowired

    private MenuConfigService menuConfigService;

    @Autowired

    private ApplicationProperties properties;

    /**

     * 登录验证

     * @param request

     * @param response

     * @return

     * @throws UnsupportedEncodingException

     */

    @RequestMapping("/login")

    @ResponseBody

    public ResponseResult<String> login(HttpServletRequest request,

            HttpServletResponse response,String username,String password) throws UnsupportedEncodingException {

        HttpSession session = request.getSession();

        if(properties.getPstUsername().equals(username)&&properties.getPstPassword().equals(password)){

            session.setAttribute("user", username);

        }else if(properties.getProdUsername().equals(username)&&properties.getProdPassword().equals(password)){

            session.setAttribute("user", username);

        }else if(properties.getSuperUsername().equals(username)&&properties.getSuperPassword().equals(password)){

            session.setAttribute("user", username);

        }else{

            username="用户名或密码错误！！！";

            return ResponseResult.buildFailure(username);

        }

        return ResponseResult.buildSuccessInstance

                (username);

    }

    public void addInterceptors(InterceptorRegistry registry) {

        // 多个拦截器组成一个拦截器链

        // addPathPatterns 用于添加拦截规则

        // excludePathPatterns 用户排除拦截

        registry.addInterceptor(new Interceptor()).addPathPatterns("/dispatcher/*").excludePathPatterns("/dispatcher/login");

        super.addInterceptors(registry);

    }

    @Override

    public void addResourceHandlers(ResourceHandlerRegistry registry) {

        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");

        super.addResourceHandlers(registry);

    }

    @Override

    public void addViewControllers(ViewControllerRegistry registry) {

        registry.addViewController("/toLogin").setViewName("login.html");

        super.addViewControllers(registry);

    }

}

只要继承

WebMvcConfigurerAdapter类后重写addInterceptors方法

再新建拦截器的类

package com.ctzj.biz.isale.deploy.util;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.web.servlet.HandlerInterceptor;

import org.springframework.web.servlet.ModelAndView;

import com.ctzj.biz.isale.deploy.websocket.LocalShellThread;

/**

 * Created by 风流丶沙.

 * Date :2017/10/25 9:36

 */

public class Interceptor implements HandlerInterceptor {

    private static final Logger LOG = LoggerFactory.getLogger(LocalShellThread.class);

    @Override

    public void afterCompletion(HttpServletRequest arg0,

            HttpServletResponse arg1, Object arg2, Exception arg3)

            throws Exception {

        // TODO Auto-generated method stub

    }

    @Override

    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,

            Object arg2, ModelAndView arg3) throws Exception {

        // TODO Auto-generated method stub

    }

    @Override

    public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1,

            Object arg2) throws Exception {

        LOG.info("method={}",arg0.getMethod());

        String role = (String) arg0.getSession().getAttribute("user");

        if(null==role||"".equals(role)){

            arg1.sendRedirect("/login.html");

//            arg0.getRequestDispatcher("/login.html").forward(arg0, arg1);

            return false;

        }else{

            return true;

        }

    }

}

preHandle这个方法再调用controller前调用，返回true继续执行下面代码，返回false不执行后面的代码！