修改pom文件

<build>
<finalName>springboot2.0</finalName>
<!--<pluginManagement>--><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<!--<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>-->
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</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>
<!--</pluginManagement>-->
</build>

注意war包和jar的pom文件不同的地方war的pom文件不用指定启动类

从写启动类

@SpringBootApplication
@MapperScan(basePackages = "com.bdqn.dao")
public class Start extends SpringBootServletInitializer {
public static void main(String[] args) {
SpringApplication.run(Start.class,args);
}

@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
return builder.sources(Start.class);
}
}

访问项目时请求地址一定要加入项目名称