11. 将博客部署到tomcat上

springboot项目既可以以jar运行，也可以做成war包放到服务器上，因为我的博客项目涉及到文件上传，所以按照jar的方式就不可行，需要部署到tomcat上，具体做法如下：
1. 修改pom.xml
1.1 将项目打包方式改为war：<packaging>war</packaging>
1.2 在spring-boot-starter-web的依赖中去除tomcat的包修改如下：

<dependency>  
    <groupId>org.springframework.boot</groupId>  
    <artifactId>spring-boot-starter-web</artifactId>  
    <exclusions>   
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
    </exclusions> 
</dependency>

1.3 添加对tomcat容器的依赖：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-tomcat</artifactId>
    <scope>provided</scope>
</dependency> 

1.4 移除spring-boot-maven-plugin插件，并增加maven-war-plugin插件：

<build>  
    <plugins>  
        <!-- <plugin>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-maven-plugin</artifactId>  
        </plugin> -->  
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <configuration>
                <warName>blog</warName>
                <failOnMissingWebXml>false</failOnMissingWebXml>
            </configuration>
        </plugin>
    </plugins> 
</build>  

2. 修改App.java，使App继承自SpringBootServletInitializer，并重写SpringApplicationBuilder方法，代码如下：

package com.lvniao.blog;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
@SpringBootApplication
public class App extends SpringBootServletInitializer {
    @RequestMapping("/")
    public ModelAndView index(Model model) {
        model.addAttribute("hello", "Hello, World!");
        return new ModelAndView("redirect:/home/");
    }
    
     @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(App.class);
    }
    
    public static void main( String[] args )
    {
           SpringApplication.run(App.class, args);
    }
}

通过以上步骤后就可以通过maven来打包发布了。