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SpringBoot学习笔记10-SpringBoot 使用拦截器(配置特定的url请求会进入拦截器)

颜路在路上 2022-04-26 阅读 19
java后端

SpringBoot 使用拦截器步骤为:
1、按照Spring mvc的方式编写一个拦截器类;
创建一个interceptor包

LoginInterceptor:
package com.springboot.web.interceptor;

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

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

public class LoginInterceptor implements HandlerInterceptor {
	//主要是这个方法中实现拦截逻辑
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
		System.out.println("已经进入拦截器");
		return true;
	}

	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
	}
	
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
	}
}

2、编写一个配置类继承WebMvcConfigurerAdapter

3、为该配置类添加@Configuration注解,标注此类为一个配置类,让Spring boot 扫描到;

4、覆盖其中的addInterceptors方法并添加已经编写好的拦截器:

代码如下:
编写WebConfig配置类

package com.springboot.web.config;

import com.springboot.web.interceptor.LoginInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@Configuration //一定要加上这个注解,成为Springboot的配置类,不然不会生效
public class WebConfig extends WebMvcConfigurerAdapter {
	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		String[] addPathPatterns = {//拦截所有请求
				"/*"
		};
		String[] excludePatterns = {//不拦截sayHi这个请求 【http://localhost:8080/sayHi】
				"/sayHi"
		};

		//如果有多个拦截器,可以继续添加
		registry.addInterceptor(new LoginInterceptor()).addPathPatterns(addPathPatterns).excludePathPatterns(excludePatterns);

	}
}

测试下:
【http://localhost:8080/config】会打印“已经进入拦截器”,说明拦截器生效
【http://localhost:8080/sayHi】不会打印,说明不拦截配置生效。

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