Spring Boot对Spring MVC的配置

先看一下以前SSM整合时Spring MVC的xml配置

    <!-- 配置SpringMVC -->    <!-- 开启SpringMVC注解模式 -->    <!-- 简化配置：     （1）自动注册DefaultAnnotationHandlerMapping,AnnotationMethodHandlerAdapter     （2）提供了一系列的功能：数据绑定,数字和日期的format@NumberFormat,@DataTimeFormat,xml,json默认读写支持 -->    <!--注解驱动-->    <mvc:annotation-driven></mvc:annotation-driven>    <!--ServletMapping映射路径：“/” -->    <!-- 静态资源默认servlet配置 1：加入对静态资源的处理：js,gif,png 2:允许使用“/”做整体映射 -->    <mvc:default-servlet-handler />    <!-- 试图解析器。配置jsp显示的ViewResolver -->    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <property             name="viewClass"            value="org.springframework.web.servlet.view.JstlView">        </property>        <!-- 配置前缀 -->        <property name="prefix" value="/WEB-INF/production/"></property>        <!-- 配置前缀 -->        <property name="suffix" value=".jsp"></property>    </bean>    <!-- 扫描web中SpringMVC的Controller -->    <context:component-scan base-package="com.hhu.web"></context:component-scan>

首先，扫描SpringMVC和注解驱动的这几步Spring Boot已经自动配置了，使用时加@Controller即可，视图解析器这一块也已经有默认的配置，但是我们可以在全局配置中去改（前缀：spring.mvc.view.prefix=”/WEB-INF/views/”，后缀spring.mvc.view.suffix=”.jsp”，当然推荐使用yml），除此之外，还有诸如拦截器的配置，上一篇文章也有提过，步骤如下：

1.首先自定义拦截器
比如一个简单的登陆拦截器：

package com.hhu.cart.interceptors;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.lang3.StringUtils;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import com.hhu.cart.service.UserService;import com.hhu.cart.threadlocal.UserThreadLocal;import com.taotao.common.utils.CookieUtils;import com.taotao.sso.query.bean.User;@Componentpublic class UserLoginHandlerInterceptor implements HandlerInterceptor {    public static final String COOKIE_NAME = "TT_TOKEN";    @Autowired    private UserService userService;    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)            throws Exception {        String token = CookieUtils.getCookieValue(request, COOKIE_NAME);        if (StringUtils.isEmpty(token)) {            // 未登录状态            return true;        }        User user = this.userService.queryUserByToken(token);        if (null == user) {            return true;        }        UserThreadLocal.set(user); // 将对象放入到本地线程中        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 {        UserThreadLocal.set(null);    }}

2.自定义拦截器配置继承WebMvcConfigurerAdapter，重写其中的addInterceptors方法
比如

package com.hhu.cart.spring.config;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.WebMvcConfigurerAdapter;import com.hhu.cart.interceptors.UserLoginHandlerInterceptor;@Configurationpublic class SpringMVCConfig extends WebMvcConfigurerAdapter {    @Autowired    private UserLoginHandlerInterceptor userLoginHandlerInterceptor;    @Override    public void addInterceptors(InterceptorRegistry registry) {        // 判断用户是否登录的拦截器，然后添加它并添加拦截规则        registry.addInterceptor(userLoginHandlerInterceptor).addPathPatterns("/cart/**");    }}