這個坑實在太深，坑的我簡直不能呼吸

像眾位網友所說的那樣，我去掉springboot內嵌的tomcat，再依賴servlet-api，修改啟動類繼承SpringBootServletInitializer，打成war放入tomcat中

但是。。。

訪問報404

這可能是條分割線

一、打成war包釋出到tomcat（這步已經完成，自行跳過）

1. pom.xml

去掉內嵌tomcat

`
     <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <scope>provided</scope><!-- 打成war的時候開啟註釋，本地開發用內嵌tomcat時加上註釋 -->
    </dependency>
`
 

打成war

`
    <packaging>war</packaging>
`

2. 啟動類

`
    @SpringBootApplication
    @ComponentScan(basePackages = "com.yzker")
    public class Application extends SpringBootServletInitializer {

        @Override
        protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
            return application.sources(Application.class);
        }

        public static void main(String[] args) {
            SpringApplication.run(Application.class, args);
        }


    }

`
 

mvn clean package 將war包放到tomcat下試試吧，如果報404，參考下面
訪問地址：localhost:{tomcat埠號} /重新命名的war包名/xxxx

二、404解決辦法

原因後續補充

1. pom.xml

`
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-legacy</artifactId>
        <version>1.1.0.RELEASE</version>
    </dependency>
`
 

2. 修改web.xml

複製下面的程式碼，修改com.yzker.test.application.Application為你自己的啟動類

`
    <?xml version="1.0" encoding="UTF-8"?>
    <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

      <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>com.yzker.test.application.Application</param-value>
      </context-param>

      <listener>
        <listener-class>org.springframework.boot.legacy.context.web.SpringBootContextLoaderListener</listener-class>
      </listener>

      <!--
          <filter>
              <filter-name>metricFilter</filter-name>
              <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
          </filter>

          <filter-mapping>
              <filter-name>metricFilter</filter-name>
              <url-pattern>/*</url-pattern>
          </filter-mapping>
      -->

      <servlet>
        <servlet-name>appServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
          <param-name>contextAttribute</param-name>
          <param-value>org.springframework.web.context.WebApplicationContext.ROOT</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
      </servlet>

      <servlet-mapping>
        <servlet-name>appServlet</servlet-name>
        <url-pattern>/</url-pattern>
      </servlet-mapping>

</web-app>
`

3. 到此為止，404的問題解決，如果還有問題，請評論，我們共同解決記錄

mvn clean package
將target目錄下生成war包放到tomcat裡吧
訪問地址：localhost:{tomcat埠號} /重新命名的war包名/xxxx