学习记录：tomcat本地可以访问自己项目，Linux不能访问，只能访问tomcat首页

1.百度了很久，说是环境有问题，这边记录一个错误：
启动tomcat服务，查看Linux的logs catalina.out  命令：cat catalina.out 演示这边具体报错是：
INFO [localhost-startStop-2] org.apache.catalina.startup.HostConfig.deployWAR Deploying web application archive [/usr/local/mytomcat8/apache-tomcat-8.5.77/webapps/IoT.war]
18-Mar-2022 10:34:06.606 SEVERE [localhost-startStop-2] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start: 
	org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/IoT]]
		at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
		at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:753)
		at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:727)
		at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:695)
		at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1016)
		at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1903)
		at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
		at java.util.concurrent.FutureTask.run(FutureTask.java:262)
		at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
		at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
		at java.lang.Thread.run(Thread.java:745)
	Caused by: java.lang.UnsupportedClassVersionError: org/springframework/jdbc/core/JdbcTemplate : Unsupported major.minor version 52.0 (unable to load class [org.springframework.jdbc.core.JdbcTemplate])
		at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2495)
		at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:876)
		at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1379)
		at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1223)
		at java.lang.Class.getDeclaredFields0(Native Method)
		at java.lang.Class.privateGetDeclaredFields(Class.java:2499)
		at java.lang.Class.getDeclaredFields(Class.java:1811)
		at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:110)
		at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:269)
		at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:137)
		at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:69)
		at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:328)
		at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:782)
		at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:299)
		at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
		at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5130)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		... 10 more


2.把编译环境统一到linux 环境，我的Linux环境是tomcat8，找了很久找到一位大佬的博客，成功解决了。
具体参考：https://blog.csdn.net/u011781521/article/details/75194071

3.在此之前也添加了一些代码到pom.xml里面，项目能成功运作，就不想动里面的配置了。

4.分享演示配置pom.xml完整代码:linux上的tomcat版本apache-tomcat-8.5.77

<!--  添加servlet的依赖jar包  -->
<dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.26</version>
        </dependency>

<!-- https://mvnrepository.com/artifact/com.alibaba/druid druid连接池依赖-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.9</version>
        </dependency>

        <!--    spring-jdbc-5.0.0.RELEASE  template依赖  -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.0.0.RELEASE</version>
        </dependency>
        <!--    spring-core-5.0.0.RELEASE  template依赖  -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>5.0.0.RELEASE</version>
        </dependency>
        <!--    spring-beans-5.0.0.RELEASE  template依赖  -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>5.0.0.RELEASE</version>
        </dependency>
        <!--    spring-tx-5.0.0.RELEASE  template依赖  -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.0.0.RELEASE</version>
        </dependency>
        <!--    commons-logging-1.2  template依赖  -->
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>

        <!--   test单元测试     -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

</dependencies>

<!--  tomcat8.x  start  -->
    <properties>
        <tomcat.version>8.5.35</tomcat.version>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <pluginRepositories>
        <pluginRepository>
            <id>alfresco-public</id>
            <url>https://artifacts.alfresco.com/nexus/content/groups/public</url>
        </pluginRepository>
        <pluginRepository>
            <id>alfresco-public-snapshots</id>
            <url>https://artifacts.alfresco.com/nexus/content/groups/public-snapshots</url>
            <snapshots>
                <enabled>true</enabled>
                <updatePolicy>daily</updatePolicy>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>beardedgeeks-releases</id>
            <url>http://beardedgeeks.googlecode.com/svn/repository/releases</url>
        </pluginRepository>
    </pluginRepositories>


    <build>
        <finalName>IoT</finalName>
        <plugins>
            <!--  tomcat8插件   -->
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat8-maven-plugin</artifactId>
                <version>3.0-r1655215</version>
                <configuration>
                    <port>80</port>
                    <path>/</path>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

<!--  tomcat8.x  end -->