项目基本配置参考文章SpringBoot入门一,使用myEclipse新建一个SpringBoot项目,使用myEclipse新建一个SpringBoot项目即可，此示例使用Eclipse，springboot升级为2.2.8版本。

1. 设置session超时时间

这里采用的是Springboot2的版本,配置方式和1不同,在配置文件application.properties文件中添加以下内容:

## 设置session过期时间(秒)
server.servlet.session.timeout=1800s

2. 自定义一个session拦截器

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

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

@Component
public class SessionInterceptor implements HandlerInterceptor {
	/**
	 * 进入controller方法之前
	 */
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		HttpSession session = request.getSession();
		if (null == session.getAttribute("username")) {
			// 重定向到指定页面
			response.sendRedirect(request.getContextPath() + "/error/401.html");
            return false;
		} 
		return HandlerInterceptor.super.preHandle(request, response, handler);
	}

	/**
	 * 调用完controller之后,视图渲染之前(不使用可删除此方法)
	 */
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		// TODO Auto-generated method stub
		HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
	}

	/**
	 * 整个完成之后,通常用于资源清理(不使用可删除此方法)
	 */
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		// TODO Auto-generated method stub
		HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
	}
}

3. 自定义一个拦截器配置

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import com.jnxj.modules.common.interceptor.SessionInterceptor;

/**
 * <h5>描述:拦截器配置</h5>
 *  
 */
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
	
	/**
	 * 定义好的拦截器
	 */
	@Autowired
    private SessionInterceptor sessionInterceptor;
	
	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		registry.addInterceptor(sessionInterceptor)	// 配置定义好的拦截器
				.addPathPatterns("/**")	// 拦截所有请求
				.excludePathPatterns(getExcludePathPatterns());	// 忽略拦截的请求
	}
	
	// =================== private method ==================
	/**
	 * <h5>功能:定义需要忽略拦截的请求</h5>
	 *
	 * @return 
	 */
	private List<String> getExcludePathPatterns(){
		List<String> excludePathPatternsList = new ArrayList<String>();
		excludePathPatternsList.add("/");
		excludePathPatternsList.add("/login");
		excludePathPatternsList.add("/css/**");
		excludePathPatternsList.add("/error/**");
		excludePathPatternsList.add("/img/**");
		excludePathPatternsList.add("/js/**");
		
		return excludePathPatternsList;
	}
}

启动项目,测试即可