背景

经常有朋友问我，平时都是使用spring mvc，打包成war包发布到tomcat上，如何快速到切换到spring boot的war或者jar包上？

先来看看传统的war包样式是什么样子的？

1. 传统的spring MVC格式的war包

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@EnableWebMvc //mvc:annotation-driven@Configuration @ComponentScan({ "com.xxx.web" }) public class SpringWebConfig extends WebMvcConfigurerAdapter {       @Override     public void addResourceHandlers(ResourceHandlerRegistry registry) {         registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");     }          @Bean     public InternalResourceViewResolver viewResolver() {         InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();         viewResolver.setViewClass(JstlView.class);         viewResolver.setPrefix("/WEB-INF/views/jsp/");         viewResolver.setSuffix(".jsp");         return viewResolver;     }   }
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对应xml的配置如下：

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<beans xmlns="http://www.springframework.org/schema/beans"     xmlns:context="http://www.springframework.org/schema/context"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xmlns:mvc="http://www.springframework.org/schema/mvc"     xsi:schemaLocation="         http://www.springframework.org/schema/beans             http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/mvc         http://www.springframework.org/schema/mvc/spring-mvc.xsd        http://www.springframework.org/schema/context         http://www.springframework.org/schema/context/spring-context.xsd ">     <context:component-scan base-package="com.xxxx.web" />     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>        <property name="prefix" value="/WEB-INF/views/jsp/" />        <property name="suffix" value=".jsp" />    </bean>     <mvc:resources mapping="/resources/**" location="/resources/" />         <mvc:annotation-driven /> </beans>
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2.spring boot格式的jar包

jar的结构，spring 尽量避免jsp的动态文件，而是使用如Thymeleaf 、FreeMarker等模板引擎，因为jsp有很多限制。

spring boot打包成war包的页面该放到哪里？

 

28.4.5 JSP Limitations

When running a Spring Boot application that uses an embedded servlet container (and is packaged as an executable archive), there are some limitations in the JSP support.

With Jetty and Tomcat, it should work if you use war packaging. An executable war will work when launched with java -jar, and will also be deployable to any standard container. JSPs are not supported when using an executable jar.

Undertow does not support JSPs.

Creating a custom error.jsp page does not override the default view for error handling. Custom error pages should be used instead.

3.spring boot 格式的war包

spring boot打包成war包的页面该放到哪里？

 

如何切换？

其实，通过上面的结构，我们可以看出，spring boot的标准规格还是不建议使用jsp的，推荐使用Thymeleaf 、FreeMarker等模板引擎，然后所有的静态文件同样存储在resources下面，可以使用代码配置动态代码

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@Configuration @EnableWebMvc public class SpringConfig {     @Bean     public InternalResourceViewResolver viewResolver()     {         InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();         viewResolver.setPrefix("/WEB-INF/view/");         viewResolver.setSuffix(".jsp");                  return viewResolver;     } }
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或者静态属性配置