SpringBoot整合拦截器

一 点睛

使用@Configuration配置拦截器

继承WebMvcConfigurerAdapter

重写addInterceptors添加需要的拦截器地址

二 实战

1 第一个拦截器

package com.imooc.controller.interceptor;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

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

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

import com.imooc.pojo.IMoocJSONResult;
import com.imooc.utils.JsonUtils;

public class OneInterceptor implements HandlerInterceptor  {

    /**
     * 在请求处理之前进行调用（Controller方法调用之前）
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
            Object object) throws Exception {
        
        System.out.println("被one拦截，放行...");
        return true;
        
        /*if (true) {
            returnErrorResponse(response, IMoocJSONResult.errorMsg("被one拦截..."));
        }
        
        return false;*/
    }
    
    /**
     * 请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response,
            Object object, ModelAndView mv)
            throws Exception {
        // TODO Auto-generated method stub
        
    }
    
    /**
     * 在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行
     * （主要是用于进行资源清理工作）
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response,
            Object object, Exception ex)
            throws Exception {
        // TODO Auto-generated method stub
        
    }
    
    public void returnErrorResponse(HttpServletResponse response, IMoocJSONResult result)
            throws IOException, UnsupportedEncodingException {
        OutputStream out=null;
        try{
            response.setCharacterEncoding("utf-8");
            response.setContentType("text/json");
            out = response.getOutputStream();
            out.write(JsonUtils.objectToJson(result).getBytes("utf-8"));
            out.flush();
        } finally{
            if(out!=null){
                out.close();
            }
        }
    }
}

2 第二个拦截器

package com.imooc.controller.interceptor;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.imooc.pojo.IMoocJSONResult;
import com.imooc.utils.JsonUtils;

public class TwoInterceptor implements HandlerInterceptor  {

    final static Logger log = LoggerFactory.getLogger(TwoInterceptor.class);
    
    /**
     * 在请求处理之前进行调用（Controller方法调用之前）
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object object) throws Exception {
        
        if (true) {
            returnErrorResponse(response, IMoocJSONResult.errorMsg("被two拦截..."));
        }
        
        System.out.println("被two拦截...");
        
        return false;
    }
    
    /**
     * 请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object object, ModelAndView mv)
            throws Exception {
        // TODO Auto-generated method stub
        
    }
    
    /**
     * 在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object object, Exception ex)
            throws Exception {
        // TODO Auto-generated method stub
        
    }
    
    public void returnErrorResponse(HttpServletResponse response, IMoocJSONResult result) throws IOException, UnsupportedEncodingException {
        OutputStream out=null;
        try{
            response.setCharacterEncoding("utf-8");
            response.setContentType("text/json");
            out = response.getOutputStream();
            out.write(JsonUtils.objectToJson(result).getBytes("utf-8"));
            out.flush();
        } finally{
            if(out!=null){
                out.close();
            }
        }
    }
}

3 配置拦截器

package com.imooc.config;

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

import com.imooc.controller.interceptor.OneInterceptor;
import com.imooc.controller.interceptor.TwoInterceptor;

@Configuration
public class WebMvcConfigurer extends WebMvcConfigurerAdapter {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        /**
         * 拦截器按照顺序执行
         */
        registry.addInterceptor(new OneInterceptor()).addPathPatterns("/one/**");
        registry.addInterceptor(new TwoInterceptor()).addPathPatterns("/two/**")
                                                     .addPathPatterns("/one/**");

        
        super.addInterceptors(registry);
    }

}

4 编写针对第1个拦截器的控制器

package com.imooc.controller.interceptor;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import com.imooc.pojo.User;

@Controller
@RequestMapping("one")
public class OneController {

    @RequestMapping("/index")
    public String index(ModelMap map) {
        map.addAttribute("name", "imooc22");
        return "thymeleaf/index";
    }
    
    @RequestMapping("center")
    public String center() {
        return "thymeleaf/center/center";
    }

    @RequestMapping("test")
    public String test(ModelMap map) {
        
        User user = new User();
        user.setAge(18);
        user.setName("manager");
        user.setPassword("123456");
        user.setBirthday(new Date());
        
        map.addAttribute("user", user);
        
        
        User u1 = new User();
        u1.setAge(19);
        u1.setName("imooc");
        u1.setPassword("123456");
        u1.setBirthday(new Date());
        
        User u2 = new User();
        u2.setAge(17);
        u2.setName("LeeCX");
        u2.setPassword("123456");
        u2.setBirthday(new Date());
        
        List<User> userList = new ArrayList<>();
        userList.add(user);
        userList.add(u1);
        userList.add(u2);
        
        map.addAttribute("userList", userList);
        
        return "thymeleaf/test";
    }
    
    @PostMapping("postform")
    public String postform(User user) {
        System.out.println(user.getName());
        return "redirect:/th/test";
    }
}

5 编写针对第2个拦截器的控制器

package com.imooc.controller.interceptor;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import com.imooc.pojo.User;

@Controller
@RequestMapping("two")
public class TwoController {

    @RequestMapping("/index")
    public String index(ModelMap map) {
        map.addAttribute("name", "itzixi22");
        return "thymeleaf/index";
    }
    
    @RequestMapping("center")
    public String center() {
        return "thymeleaf/center/center";
    }

    @RequestMapping("test")
    public String test(ModelMap map) {
        
        User user = new User();
        user.setAge(18);
        user.setName("manager");
        user.setPassword("123456");
        user.setBirthday(new Date());
        
        map.addAttribute("user", user);
        
        
        User u1 = new User();
        u1.setAge(19);
        u1.setName("itzixi");
        u1.setPassword("123456");
        u1.setBirthday(new Date());
        
        User u2 = new User();
        u2.setAge(17);
        u2.setName("LeeCX");
        u2.setPassword("123456");
        u2.setBirthday(new Date());
        
        List<User> userList = new ArrayList<>();
        userList.add(user);
        userList.add(u1);
        userList.add(u2);
        
        map.addAttribute("userList", userList);
        
        return "thymeleaf/test";
    }
    
    @PostMapping("postform")
    public String postform(User user) {
        System.out.println(user.getName());
        return "redirect:/th/test";
    }
}

三 测试

1 浏览器输入http://localhost:8080/one/index

浏览器输出：

{"status":500,"msg":"被two拦截...","data":null,"ok":null}

控制台输出：

被one拦截，放行...

被two拦截...

说明/index被拦截器one拦截、被two放行。