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[十四]SpringBoot 之 Spring拦截器(HandlerInterceptor)

时间:2017-03-02 15:15:28      阅读:1767      评论:0      收藏:0      [点我收藏+]

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过滤器属于Servlet范畴的API,与spring 没什么关系。 
Web开发中,我们除了使用 Filter 来过滤请web求外,还可以使用Spring提供的HandlerInterceptor(拦截器)。

HandlerInterceptor 的功能跟过滤器类似,但是提供更精细的的控制能力:在request被响应之前、request被响应之后、视图渲染之前以及request全部结束之后。我们不能通过拦截器修改request内容,但是可以通过抛出异常(或者返回false)来暂停request的执行

 

实现 UserRoleAuthorizationInterceptor 的拦截器有: 
ConversionServiceExposingInterceptor 
CorsInterceptor 
LocaleChangeInterceptor 
PathExposingHandlerInterceptor 
ResourceUrlProviderExposingInterceptor 
ThemeChangeInterceptor 
UriTemplateVariablesHandlerInterceptor 
UserRoleAuthorizationInterceptor

其中 LocaleChangeInterceptor 和 ThemeChangeInterceptor 比较常用。

1、创建我们自己的拦截器类并实现 HandlerInterceptor 接口

package me.shijunjie.interceptor;

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

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

public class MyInterceptor1 implements HandlerInterceptor {

    @Override
    public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
            throws Exception {
        System.out.println(">>>MyInterceptor1>>>>>>>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 postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
            throws Exception {
        System.out.println(">>>MyInterceptor1>>>>>>>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 boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception {
        System.out.println(">>>MyInterceptor1>>>>>>>在请求处理之前进行调用(Controller方法调用之前)");
        return true;// 只有返回true才会继续向下执行,返回false取消当前请求
    }

}
package me.shijunjie.interceptor;

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

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

public class MyInterceptor2 implements HandlerInterceptor {

    @Override
    public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
            throws Exception {
        System.out.println(">>>MyInterceptor2>>>>>>>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 postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
            throws Exception {
        System.out.println(">>>MyInterceptor2>>>>>>>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 boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception {
        System.out.println(">>>MyInterceptor2>>>>>>>在请求处理之前进行调用(Controller方法调用之前)");
        return true;// 只有返回true才会继续向下执行,返回false取消当前请求
    }

}

2、创建一个Java类继承WebMvcConfigurerAdapter,并重写 addInterceptors 方法。

实例化我们自定义的拦截器,然后将对像手动添加到拦截器链中(在addInterceptors方法中添加)。

实例化我们自定义的拦截器也可以交给spring来做,可以用autowired来注入

package me.shijunjie.config;

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

import me.shijunjie.interceptor.MyInterceptor1;
import me.shijunjie.interceptor.MyInterceptor2;

@Configuration
public class MyWebAppConfiguer extends WebMvcConfigurerAdapter {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new MyInterceptor1()).addPathPatterns("/**");
        registry.addInterceptor(new MyInterceptor2()).addPathPatterns("/**");
        super.addInterceptors(registry);
    }
}

入口

package me.shijunjie.testspringboot2;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@ServletComponentScan("me.shijunjie")
@ComponentScan("me.shijunjie")
public class App 
{
    
    /* *//**
     * 注册Servlet.不需要添加注解:@ServletComponentScan
     * @return
     *//*
    @Bean
    public ServletRegistrationBean myServlet1(){

           return new ServletRegistrationBean(new MyServlet1(),"/myServlet/*");
    }*/
    
    public static void main( String[] args )
    {
        SpringApplication.run(App.class, args);
    }
}

 

[十四]SpringBoot 之 Spring拦截器(HandlerInterceptor)

标签:dap   public   span   控制   err   不能   versions   main   取消   

原文地址:http://www.cnblogs.com/s648667069/p/6490521.html

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