背景：Spring Boot 集成servlet，發布為可直接運行的war包，方便后續打包為docker鏡像。

1、build.gradle 配置

注意，加入了war插件，在依賴中加入了jstl、tomcat-embed-jasper，這樣才能運行jsp頁面。

buildscript {
    ext {
        springBootVersion = '1.5.3.RELEASE'
    }
    repositories {
        maven { url "http://maven.aliyun.com/nexus/content/groups/public/" }
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    }
}
apply plugin: 'java'
apply plugin: 'idea'
apply plugin: 'org.springframework.boot'
apply plugin: 'war'

version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
    maven { url "http://maven.aliyun.com/nexus/content/groups/public/" }
}
dependencies {
    compile 'jstl:jstl:1.2'
    compile 'org.apache.tomcat.embed:tomcat-embed-jasper'
    compile('org.springframework.boot:spring-boot-starter-web')
    testCompile('org.springframework.boot:spring-boot-starter-test')
}

2、spring boot 入口文件配置

注意：繼承SpringBootServletInitializer,開啟@ServletComponentScan

@SpringBootApplication
@ServletComponentScan
public class DemoApplication extends SpringBootServletInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(DemoApplication.class);
    }
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

3、servlet/jsp 的正確姿勢

文件布放圖

3.1、servlet

注意：使用了@WebServlet配置頁面訪問地址，訪問jsp頁面需要使用完整的相對路徑/WEB-INF/jsp/index.jsp

@WebServlet( urlPatterns = {"/index"})
public class Index extends HttpServlet {
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        doGet(req, resp);
    }
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.getRequestDispatcher("/WEB-INF/jsp/index.jsp").forward(request, response);
    }
}

3.2、controller方式使用jsp

注意：配合application.properties配置，可以使用簡化的jsp路徑

①application.properties配置

spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp

②controller編寫

@Controller
    public class HelloController {
        @RequestMapping("/index1")
        public ModelAndView index(ModelAndView view) {
            view.setViewName("index");
            return view;
        }
    }

4、運行方法

右鍵入口文件直接運行
bootRun
執行gradle build，java -jar xxx.war

5、完整實例代碼

https://github.com/weibaohui/springboot-servlet-jsp-war-demo