deploy springboot to tomcat

　　　　1    在 Eclipse 中建立新的web项目【ABC】，之后 转成Maven项目。

2   创建 class   Application

3  修改POM

4  修改web.xml

5  export 成 WAR 到Tomcat 的 workapps里

　　　　 6 运行tomcat, 并在浏览器中查看。

Application.class

package demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Application extends SpringBootServletInitializer {
    private static Class<Application> applicationClass = Application.class;

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

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

}

@RestController
class GreetingController {

    @RequestMapping("/hello/{name}")
    String hello(@PathVariable String name) {
        return "Hello, " + name + "!";
    }
} 

pom.xml

<?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.</modelVersion>

    <artifactId>spring-boot-web-thymeleaf</artifactId>
    <packaging>war</packaging>
    <name>Spring Boot Web Thymeleaf Example</name>
    <description>Spring Boot Web Thymeleaf Example</description>
    <url>https://www.mkyong.com</url>
    <version>1.0</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4..RELEASE</version>
    </parent>

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

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <!-- hot swapping, disable cache for template, enable live reload -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- Optional, for bootstrap -->
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>bootstrap</artifactId>
            <version>3.3.</version>
        </dependency>

        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>

        <dependency>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.19.</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-legacy</artifactId>
            <version>1.1..RELEASE</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <!-- Package as an executable jar/war -->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
  <display-name>ABC</display-name>
  <listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

 <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>demo.Application</param-value>
      </context-param>

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

      <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></load-on-startup>
      </servlet>

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

  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

查看：  http://localhost:8080/ABC/hello/s

输出 ： Hello, s!

参考url:  https://www.cnblogs.com/weixliu/p/6432342.html

备注：

spring-boot-starter-parent [Maven的用户可以通过继承spring-boot-starter-parent项目来获得一些合理的默认配置]
spring-boot-legacy [支持 旧的遗留的 ]
spring-boot-starter-thymeleaf [parse html]
spring-boot-maven-plugin [Java -jar命令来启动jar包,打的包里面才会有maven依赖的jar包和spring boot的启动类]
maven-surefire-plugin [surefire 插件用来在maven构建生命周期的test phase执行一个应用的单元测试]
org.webjars [WebJars能使Maven的依赖管理支持OSS的JavaScript库/CSS库，比如jQuery、Bootstrap等]
spring-boot-devtools [spring-boot-devtools模块可以包含在任何项目中，它可以节省大量的时间] https://blog.csdn.net/isea533/article/details/70495714
commons-logging [通用日志]