springboot学习之拦截器配置

拦截器（Interceptor）实现对每一个请求处理前后进行相关的业务处理，类似Servlet的Filter。

Spring boot中快速实现拦截器的方式：

1、实现HandlerInterceptor接口。

2、继承HandlerInterceptorAdaptor类来实现。

下面具体演示过程，该过程是基于搭建好的maven spring boot环境实现：

方式一：通过实现HandlerInterceptor接口。

a、创建DemoInterceptor，然后implements类HandlerInterceptor

package com.wanghp.demo.configurer;

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

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

/**
 * description:
 * created by wanghaiping
 * created date 2017/12/10
 */
public class DemoInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        System.out.println("----------使用接口实现的方式实现（在请求发生之前执行）---------");

        return true;// 只有返回true才会继续向下执行，返回false取消当前请求
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("----------使用接口实现的方式实现（在请求发生之后执行）---------");
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("----------使用接口实现的方式实现（在请求发生之后执行），但是在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）---------");
    }


}

b、创建配置类，并注册拦截器

package com.wanghp.demo.configurer;

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

/**
 * description:
 * created by wanghaiping
 * created date 2017/12/10
 */
@Configuration
public class DemoWebMvcConfigurer extends WebMvcConfigurerAdapter {


     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 DemoInterceptor()).addPathPatterns("/**");
         //registry.addInterceptor(new DemoInterceptor1()).addPathPatterns("/**");
         super.addInterceptors(registry);
     }

}

c、创建测试Controller，并在浏览器进行访问测试。

package com.wanghp.demo.spring.controller;

import com.wanghp.demo.spring.commontest.readconfig.GirlProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * description:
 * created by wanghaiping
 * created date 2017/12/8
 */
@RestController
@RequestMapping("/testController")
public class TestController {
    @GetMapping("/testController")
    public String test(){
        return "test";
    }

}

d、测试结果如下
访问：http://localhost:8080/demo/testController/testController

结果：

方式二：通过继承HandlerInterceptorAdaptor类来实现。。

a、创建DemoInterceptor1，然后继承HandlerInterceptorAdaptor

import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

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

/**
 * description: 使用继承的方式实现拦截器，选择性的重写相关的类即可
 * created by wanghaiping
 * created date 2017/12/10
 */
public class DemoInterceptor1 extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        System.out.println("----------使用继承类的方式实现（在请求发生之前执行）---------");
        return true;// 只有返回true才会继续向下执行，返回false取消当前请求
    }




}

b、创建配置类，并注册拦截器

package com.wanghp.demo.configurer;

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

/**
 * description:
 * created by wanghaiping
 * created date 2017/12/10
 */
@Configuration
public class DemoWebMvcConfigurer extends WebMvcConfigurerAdapter {


     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 DemoInterceptor()).addPathPatterns("/**");
         registry.addInterceptor(new DemoInterceptor1()).addPathPatterns("/**");
         super.addInterceptors(registry);
     }

}

c、创建测试Controller，并在浏览器进行访问测试。

package com.wanghp.demo.spring.controller;

import com.wanghp.demo.spring.commontest.readconfig.GirlProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * description:
 * created by wanghaiping
 * created date 2017/12/8
 */
@RestController
@RequestMapping("/testController")
public class TestController {
    @GetMapping("/testController")
    public String test(){
        return "test";
    }

}

d、测试结果如下
访问：http://localhost:8080/demo/testController/testController

结果：