springboot项目eclipse可正常访问，部署到tomcat却无法访问项目

解决：
在springboot项目的启动类（含main方法的类）中添加继承extends springApplicationBuilder，并重写方法：

@Override
	protected SpringApplicationBuilder configure(SpringApplicationBuilder springApplicationBuilder) {
		return springApplicationBuilder.sources(DiagnosisCenterApplication.class);
	}

----------------------------------------分割线-----------------------------------------------------

package com.jinshan.diagnosiscenter;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.context.annotation.Bean;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;


@SpringBootApplication
@EnableAutoConfiguration
@ServletComponentScan
public class DiagnosisCenterApplication implements WebMvcConfigurer {
	
	
	public static void main(String[] args) {
		SpringApplication.run(DiagnosisCenterApplication.class, args);
	}
	
	@Bean
	public RestTemplate restTemplate(ClientHttpRequestFactory factory) {
		return new RestTemplate(factory);
	}
 
	@Bean
	public ClientHttpRequestFactory simpleClientHttpRequestFactory() {
		SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
		factory.setReadTimeout(180000);//单位为ms
		factory.setConnectTimeout(5000);//单位为ms
		return factory;
	}
	

}

	4.0.0
	
		org.springframework.boot
		spring-boot-starter-parent
		2.4.5
		 
	
	com.jinshan
	diagnosis-center
	1.0.0
	war
	diagnosis-center
	Demo project for Spring Boot
	
		1.8
	
	
		
			org.springframework.boot
			spring-boot-starter-web
			
				
				
					org.springframework.boot
					spring-boot-starter-logging
				
			
		

		
			mysql
			mysql-connector-java
			runtime
		
		
			org.springframework.boot
			spring-boot-starter-test
			test
		

		
		
			com.google.guava
			guava
			30.1-jre
		

		
		
			com.google.code.gson
			gson
		
		
		
			org.springframework.boot
			spring-boot-starter-actuator
		

		
		
		
			org.springframework.boot
			spring-boot-starter-log4j2
		

		
			org.projectlombok
			lombok
		
		


	

	
		diagnosiscenter
		
			
				org.springframework.boot
				spring-boot-maven-plugin
			
		
	

无法访问。

• 缺少打包的依赖
• 打包插件问题
• 依赖版本问题

• 核对tomcat/conf/server.xml

一番操作之后发现都没有用，然后就看tomcat的日志信息，如下：

如图所示，只是tomcat启动了，但是并没有加载项目。，这就是原因所在

在网上对应一搜，找到一老大哥的文章https://www.pianshen.com/article/1265130159/ 解决了问题。

在springboot项目的启动类（含main方法的类）中添加继承extends springApplicationBuilder，并重写方法：

@Override
	protected SpringApplicationBuilder configure(SpringApplicationBuilder springApplicationBuilder) {
		return springApplicationBuilder.sources(DiagnosisCenterApplication.class);
	}

完整的启动类：

package com.jinshan.diagnosiscenter;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
import org.springframework.context.annotation.Bean;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;


@SpringBootApplication
@EnableAutoConfiguration
@ServletComponentScan
public class DiagnosisCenterApplication extends SpringBootServletInitializer implements WebMvcConfigurer {
	
	@Override
	protected SpringApplicationBuilder configure(SpringApplicationBuilder springApplicationBuilder) {
		return springApplicationBuilder.sources(DiagnosisCenterApplication.class);
	}
	
	public static void main(String[] args) {
		SpringApplication.run(DiagnosisCenterApplication.class, args);
	}
	
	@Bean
	public RestTemplate restTemplate(ClientHttpRequestFactory factory) {
		return new RestTemplate(factory);
	}
 
	@Bean
	public ClientHttpRequestFactory simpleClientHttpRequestFactory() {
		SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
		factory.setReadTimeout(180000);//单位为ms
		factory.setConnectTimeout(5000);//单位为ms
		return factory;
	}
	

}

重新打包并部署，查看日志：

如图所示，项目正常启动。

访问：

正常访问。