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！