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真实完整步骤，踩坑整理 有同样的坑，欢迎补充整理

网上的案例老是少了很多配置，本案例涉及到 spring-mvc，自定义多数据源，统一前缀，事务，mybatis，jsp访问异常，静态文件。

项目还是老的目录结构

springboot的目的就是为了简化开发，使用配置的方式，因此 我们最终的目标 就是删除springmvc项目中 web.xml  springmvc相关配置  mybatis配置等；

1.添加springboot相关的pom依赖 
redis、日志等等按需添加，老的spring的相关都删除

<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.7.0</version>
</parent><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId>
</dependency><build><finalName>JoeProject</finalName><outputDirectory>${basedir}/target/site</outputDirectory><resources><resource><directory>src/main/java</directory><includes><include>**/*.*</include></includes><filtering>false</filtering></resource><resource><directory>src/main/resources</directory><includes><include>**/*.*</include></includes><filtering>false</filtering></resource><resource><directory>src/main/webapp</directory><includes><include>**/*.*</include></includes><filtering>false</filtering></resource></resources><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins>
</build>

2.添加启动类

@SpringBootApplication
public class JoeApplication extends SpringBootServletInitializer {// 入口public static void main(String[] args) {SpringApplication.run(JoeApplication.class, args);}// Java EE应用服务器配置，// 如果要使用tomcat来加载jsp的话就必须继承SpringBootServletInitializer类并且重写其中configure方法@Overrideprotected SpringApplicationBuilder configure(SpringApplicationBuilder application) {return application.sources(JoeApplication.class);}}

3.添加 application.yml
3.1包括端口，全局参数以及全局路径，环境分支，上传
3.2本案例 数据源暂时不用配置（因为老的使用了多数据源 并且需要自定义解析数据库的密文，因此下面将使用编程式（较传统）配置多数据源），也可以使用苞米豆的 多数据源配置，然后注解Ds()

server:port: 8082servlet:encoding:charset: utf-8context-path: /Joe# 全局变量参数，可以用在jsp中 <script src="<%=application.getInitParameter("Joe") %>/static/ss.js></script>context-parameters:Joe: /Joespring:profiles:active: branchservlet:multipart:max-file-size: 500MBmax-request-size: 500MB

      
4.重点！！ web.xml的处理
4.1 老的web.xml都可以删除，但是里面一些主要的，包括全局参数 、欢迎页、异常处理、以及springmvc的配置文件（拦截器、事务、数据源与mybatis配置）都需要代码来处理
4.2 老项目全是*.do idea可以全局替换（注意要全词匹配 .do,然后大概看下防止错误) Eidt-find-replace in files
4.2.1 静态文件get请求处理
4.3 对spring-mvc.xml进行配置
4.3.1 路径拦截处理
<!-- 老版本
<mvc:interceptors>
    <mvc:interceptor>
        <mvc:mapping path="/marketing/*"/>
        <bean class="com.Joe.until.LoginInterceptor" ></bean>
    </mvc:interceptor>
</mvc:interceptors> -->

修改后：
WebmvcConfig.java
@Configuration
// 踩坑 extends WebMvcConfigurationSupport导致我的页面访问请求都被当作一个Controller层请求而被处理了。导致页面的 js css都加载不出来

@Configuration
// public class WebmvcConfig extends WebMvcConfigurationSupport {
public class WebmvcConfig implements WebMvcConfigurer {// 首页添加@Overrideprotected void addViewControllers(ViewControllerRegistry registry) {registry.addViewController("/").setViewName("views/loadLogin");}// 踩坑，不能使用application.yml的配置方式@Beanpublic InternalResourceViewResolver viewResolver() {InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();viewResolver.setPrefix("/WEB-INF/");viewResolver.setSuffix(".jsp");return viewResolver;}@Overrideprotected void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/test/*").excludePathPatterns("/", "/login", "/css/**", "/js/**", "/views/**");super.addInterceptors(registry);}
}

LoginInterceptor.java

public class LoginInterceptor extends BaseInterceptor implements HandlerInterceptor {// 验证@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {try {Cookie userSysno = CookiesUntil.getCookieByName(request, "userSysno");Cookie sid = CookiesUntil.getCookieByName(request, "sid");boolean re;if (userSysno != null && sid != null) {re = this.checkLogin(request, response, sid, userSysno);} else {RedisUtil.ClearKey(userSysno.getValue() + "permissions");re = false;}if (!re) {RedisUtil.ClearKey(userSysno.getValue() + "permissions");request.getRequestDispatcher("/login/loginOut").forward(request, response);return false;} else {return true;}} catch (Exception ex) {System.out.println("preHandle:" + ex.getMessage());request.getRequestDispatcher("/login/loginOut").forward(request, response);return false;}}
}

5.重点！！spring-mybatis配置修改 多数据源处理 
老项目采用的AbstractRoutingDataSource、自定义SqlSessionFactoryBean、ThreadLocal<String> contextHolder切换数据源。
四个类搞定自定义多数据源

DynamicDataSource.java

public class DynamicDataSource extends AbstractRoutingDataSource {@Overrideprotected Object determineCurrentLookupKey() {return CustomerContextHolder.getCustomerType();}}

DatasourceConfig.java 多数元配置

@Configuration
public class DatasourceConfig {@Value("${jdbc.url: sqlserver://allin.w.allin}")public String jdbcUrl;@Value("${jdbc17.url: sqlserver://allin.r.Joe}")public String jdbc17Url;@Value("${jdbcallinDatatool.url: sqlserver://allin.w.allindatatool}")public String jdbcallinDatatoolUrl;@Value("${jdbc17Joeallin.url: sqlserver://allin.w.Joeallin}")@Primary@Bean(name = "dataSource1")public DataSource dataSource1() {DruidDataSource ds = new DruidDataSource();try {ds.setDriverClassName("com.microsoft.sqlserver.jdbc.SQLServerDriver");// 自定义解析 配置文件中的url，可以使用setpassword setnameds.setUrl(AllineDecoderClient.getInstance().getConnectionString(jdbcUrl));} catch (Exception e) {e.printStackTrace();}return ds;}@Bean(name = "dataSource2")public DataSource dataSource2() {DruidDataSource ds = new DruidDataSource();ds.setDriverClassName("com.microsoft.sqlserver.jdbc.SQLServerDriver");ds.setUrl(AllineDecoderClient.getInstance().getConnectionString(jdbc17Url));return ds;}@Bean(name = "dataSource3")public DataSource dataSource3() {DruidDataSource ds = new DruidDataSource();ds.setDriverClassName("com.microsoft.sqlserver.jdbc.SQLServerDriver");ds.setUrl(AllineDecoderClient.getInstance().getConnectionString(jdbcallinDatatoolUrl));return ds;}@Bean(name = "dataSource4")public DataSource dataSource4() {DruidDataSource ds = new DruidDataSource();ds.setDriverClassName("com.microsoft.sqlserver.jdbc.SQLServerDriver");ds.setUrl(AllineDecoderClient.getInstance().getConnectionString(jdbc17JoeallinUrl));return ds;}@Bean(name = "dynamicDataSource")public DataSource dynamicDataSource() {DynamicDataSource dynamicDataSource = new DynamicDataSource();Map<Object, Object> dataSourceMap = new HashMap<>();dataSourceMap.put("dataSource1", dataSource1());dataSourceMap.put("dataSource2", dataSource2());dataSourceMap.put("dataSource3", dataSource3());dataSourceMap.put("dataSource4", dataSource4());dynamicDataSource.setTargetDataSources(dataSourceMap);// 设置默认数据源dynamicDataSource.setDefaultTargetDataSource(dataSource1());return dynamicDataSource;}}

CustomerContextHolder.java

public class CustomerContextHolder {public static final String DATA_SOURCE_A = "dataSource1";public static final String DATA_SOURCE_B = "dataSource2";public static final String DATA_SOURCE_C = "dataSource3";public static final String DATA_SOURCE_D = "dataSource4";private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();public static void setCustomerType(String customerType) {contextHolder.set(customerType);}public static String getCustomerType() {return contextHolder.get();}public static void clearCustomerType() {contextHolder.remove();}
}

DataSourceConfigDynamic.java  

@Configuration
@MapperScan(basePackages = "com.Joe.allin.dao", sqlSessionFactoryRef = "sqlSessionFactory") // 踩坑 未配置sqlSessionFactoryRef
public class DataSourceConfigDynamic {@Primary@Bean("sqlSessionFactory")SqlSessionFactory sqlSessionFactory(@Qualifier("dynamicDataSource") DataSource dynamicDataSource)throws Exception {SqlSessionFactoryBean bean = new SqlSessionFactoryBean();bean.setDataSource(dynamicDataSource);// 踩坑 未配置setMapperLocationsbean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:com/Joe/allin/mapping/*.xml"));return bean.getObject();}}

-- 使用多数据源 在service调用dao层数据源前使用，然后清楚，默认数据源A不用写

CustomerContextHolder.setCustomerType(CustomerContextHolder.DATA_SOURCE_B);
xxService.test();
CustomerContextHolder.clearCustomerType();

6.全局事务采用注解方式
7.全局异常处理 度娘一大堆
8.可能还会出现循环依赖、乱码、版本依赖冲突等。根据自己的问题自行处理
9.关于war jar的问题，我还是使用的war包，启动 直接application的方式就可以，依赖里内嵌了tomcat