背景

經常有朋友問我，平時都是使用spring mvc，打包成war包釋出到tomcat上，如何快速到切換到spring boot的war或者jar包上？

先來看看傳統的war包樣式是什麼樣子的？

1. 傳統的spring MVC格式的war包

可以看到，webapp/resouces檔案存放css/js/html等靜態檔案，WEB-INF存放jsp動態檔案。

對應的配置檔案

@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;
 }
 
}

對應xml的配置如下：

<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>

2.spring boot格式的jar包

jar的結構，spring 儘量避免jsp的動態檔案，而是使用如Thymeleaf 、FreeMarker等模板引擎，因為jsp有很多限制。

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

如何切換？

其實，通過上面的結構，我們可以看出，spring boot的標準規格還是不建議使用jsp的，推薦使用Thymeleaf 、FreeMarker等模板引擎，然後所有的靜態檔案同樣儲存在resources下面，可以使用程式碼配置動態程式碼

@Configuration
@EnableWebMvc
public class SpringConfig
{
 @Bean
 public InternalResourceViewResolver viewResolver()
 {
  InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
  viewResolver.setPrefix("/WEB-INF/view/");
  viewResolver.setSuffix(".jsp");
  
  return viewResolver;
 }
}

或者靜態屬性配置

spring.mvc.static-path-pattern=/resources/**

來自定義配置。

也可以使用靜態檔案動態化

spring.resources.chain.strategy.content.enabled=true
spring.resources.chain.strategy.content.paths=/**
spring.resources.chain.strategy.fixed.enabled=true
spring.resources.chain.strategy.fixed.paths=/js/lib/
spring.resources.chain.strategy.fixed.version=v12

注意：centos下使用tomcat時，編譯的jsp檔案，上傳的檔案等等預設都儲存在臨時目錄裡，會

If you choose to use Tomcat on centos， be aware that,by default,a temporary directory is used to store compiled JSPs,file uploads,and so on. This directory may be deleted by tmpwatch while your application is running,leading to failures. To avoid this behavior,you may want to customize your tmpwatch configuration such that tomcat.* directories are not deleted or configure server.tomcat.basedir such that embedded Tomcat uses a different location.

總結

以上所述是小編給大家介紹的spring boot打包成war包的頁面如何存放，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回覆大家的。在此也非常感謝大家對我們網站的支援！
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