不需要改造目录结构的升级方法

1.pom.xml文件升级

1.1添加依赖的SpringBoot包

<dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-dependencies</artifactId>
             <version>${springboot.version}</version>
             <type>pom</type>
             <scope>import</scope>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
             <version>${springboot.version}</version>
             <exclusions>
                 <exclusion>
                     <groupId>ch.qos.logback</groupId>
                     <artifactId>logback-classic</artifactId>
                 </exclusion>
             </exclusions>
         </dependency>

         <!--<dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <version>${springboot.version}</version>
             <scope>test</scope>
         </dependency>-->

         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-tomcat</artifactId>
             <version>${springboot.version}</version>
             <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-autoconfigure</artifactId>
             <version>${springboot.version}</version>
         </dependency>
         <dependency>
             <groupId>org.apache.tomcat.embed</groupId>
             <artifactId>tomcat-embed-jasper</artifactId>
             <version>9.0.24</version>
         </dependency>

1.2 修改打包方式war改成jar

<packaging>jar</packaging>

2.升级相关的spring全家桶的包版本到5版本

spring-core，spring-security，spring-webmvc，spring-context，spring-context-support等
如果用到hibernate，官网要求升级到5，其实可以不用升级，相应的jar包还保留用低版本不升级即可

3.新增springboot启动主类，任意位置都可以，建议放到官网推荐根目录位置

@ServletComponentScan(basePackages = "com.xxx.listener.*")//扫描现有监听器包路径
@SpringBootApplication
public class PlanningStartApplication extends SpringBootServletInitializer {
    public static void main(String args[]){
        SpringApplication.run(PlanningStartApplication.class,args);
    }
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(PlanningStartApplication.class);
    }

}

4.新增springboot扫描类，用来处理之前web.xml文件，过滤器等

//声明当前类为一个配置类
@Configuration
//自动扫描包路径
@ComponentScan({"com.xxx1.**", "com.xxx2.*"})
//引入之前已经存在的配置文件
@ImportResource(locations = {
        "classpath:application-context.xml",
        "classpath:dispatcher-servlet.xml"
})
public class ApplicationConfig {
    private static final Logger log =  Logger.getLogger(ApplicationConfig.class);
    private StrutsPrepareAndExecuteFilter strutsPrepareAndExecuteFilter = new StrutsPrepareAndExecuteFilter(); //springboot启动时初始化struts2拦截器
    @Bean
    public ViewResolver getViewResolver(){
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/");
        resolver.setSuffix(".jsp");
        resolver.setViewClass(JstlView.class);
        resolver.setOrder(0);
        return resolver;
    }
    @Bean
    @Order(1)
    public FilterRegistrationBean i18nFilter() {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(new I18NFilter());//注册拦截filter
        registrationBean.addUrlPatterns("/*");//拦截路径
        return registrationBean;
    }

    @Bean
    @Order(2)
    public FilterRegistrationBean currentContextFilter() {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(new CurrentContextFilter());//注册拦截filter
        registrationBean.addUrlPatterns("/*");//拦截路径
        return registrationBean;
    }

    @Bean
    @Order(3)
    public FilterRegistrationBean loginFilter() {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(new LoginFilter());//注册拦截filter
        registrationBean.addUrlPatterns("/*");//拦截路径
        return registrationBean;
    }

    @Bean
    @Order(4)
    public FilterRegistrationBean securityFilter() {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(new SecurityFilter());//注册拦截filter
        registrationBean.addUrlPatterns("/*");//拦截路径
        return registrationBean;
    }

    @Bean
    @Order(5)
    public FilterRegistrationBean strutsPrepareAndExecuteFilter() {
        log.debug("Instantiating StrutsPrepareAndExecuteFilter");
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(strutsPrepareAndExecuteFilter);//注册Struts2拦截器
        registrationBean.setName("StrutsPrepareAndExecuteFilter");
        registrationBean.addUrlPatterns("/*");//默认拦截所有请求
        return registrationBean;
    }

    @Bean
    public ServletRegistrationBean getServletRegistrationBean() {
        ServletRegistrationBean bean = new ServletRegistrationBean(new DispatcherServlet());
        bean.addUrlMappings("*.service");
        return bean;

    }

5.老项目用的jsp页面，由于springboot2不再提供jsp解析，需要添加包类来自己处理

     <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
         <artifactId>tomcat-embed-jasper</artifactId>
         <version>9.0.24</version>
    </dependency>

然后再配置类里面添加

    @Bean
    public ViewResolver getViewResolver(){
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/");
        resolver.setSuffix(".jsp");
        resolver.setViewClass(JstlView.class);
        resolver.setOrder(0);
        return resolver;
    }

6.在application.properties文件里面新增

spring.main.allow-bean-definition-overriding=true

用来处理相应的bug

7.监听器处理

7.1在老的监听器添加注解

@WebListener
public class OnlineUserListener implements HttpSessionListener, HttpSessionAttributeListener {

7.2在Spring启动类里面添加注解

@ServletComponentScan(basePackages = "com.xxx.listener.*")

8.还有一点需要注意的，笔者用的idea，需要在打包里面添加

image.png

才能运行成功，否则访问页面会报404