Springboot项目部署到tomcat中访问接口出现404的问题

SpringBoot项目部署到tomcat中访问接口显示404

错误显示

找了好久，最后发现，application.properties文件中设置的上下文路径是无效的，访问的时候要去掉lncywlc，直接按照路由访问！
这是因为使用外部Tomcat部署访问的时候，application.properties(或者application.yml)中配置的
server.port=
server.servlet.context-path=
都会失效

// An highlighted block
server.port=80
server.servlet.context-path=/lncywlc

修正后：

重点！！！！当然，这里说一下前提！
1.启动类要和controller在同一个包下

2、启动类要继承SpringBootServletInitializer接口`

//启动类
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
public class DemoApplication extends SpringBootServletInitializer {

// 用来测试访问
@RequestMapping("/lncywlc")
public String home() {
return "hello 已启动项目";
}
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
// 注意这里要指向原先用main方法执行的Application启动类
return builder.sources(DemoApplication.class);
}
}

这里是我都pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.lncywlc</groupId>
<artifactId>rio</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>rio</name>
<description>Demo project for Spring Boot</description>

<properties>
<java.version>1.8</java.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<!-- 1.日志 -->
<!-- 实现slf4j接口并整合 -->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>

</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>