SpringMVC：整合嵌入式Tomcat

环境搭建

导入以下依赖：

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.13</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.tomcat.embed/tomcat-embed-core -->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-core</artifactId>
            <version>9.0.44</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.tomcat.embed/tomcat-embed-jasper -->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <version>9.0.44</version>
        </dependency>
    </dependencies>

编写AbstractAnnotationConfigDispatcherServletInitializer实现类，

具体原理可参考：

public class QuickWebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
	@Override //spring配置文件
	protected Class<?>[] getRootConfigClasses() {
		return new Class<?>[]{AppConfig.class};
	}

	@Override //springmvc的配置文件
	protected Class<?>[] getServletConfigClasses() {
		return new Class<?>[]{MvcConfig.class};
	}

	@Override //servlet映射
	protected String[] getServletMappings() {
		return new String[]{"/"};
	}
}

编写配置类，service，controller：

@ComponentScan("com.wj.service")
@Configuration
public class AppConfig {
}
@Configuration
@ComponentScan("com.wj.controller")
public class MvcConfig {
}

@RestController
public class TestController {

	public TestController(){
		System.out.println("MyController ...");
	}

	@Autowired
	private ApplicationContext applicationContext;

	@Autowired
	private MyService myService;

	@RequestMapping("test")
	public String test() {
		System.out.println(applicationContext);
		return myService.test();
	}
}

@Service
public class MyService {

	public MyService(){
		System.out.println("MyService...");
	}

	@Autowired
	private ApplicationContext applicationContext;

	public String test() {
		return "hello spring mvc";
	}
}

目录结构如下：

编写main方法

编写main方法，用于启动tomcat：

注意：

Tomcat 9.0 必须调用 tomcat.getConnector() 方法之后才会监听端口，否则一直会阻塞
Tomcat 8 必须在tomcat.start()后调用tomcat.getServer().await();，否则main方法直接结束。

我这里用的是tomcat9依赖，所以按照下面这种写法就行了。

    public static void main(String[] args) throws LifecycleException {
        Tomcat tomcat = new Tomcat();

        tomcat.setPort(8080);
        tomcat.setHostname("localhost");
        tomcat.setBaseDir(".");
        //设置contextPath和baseDir
        tomcat.addWebapp("/boot", System.getProperty("user.dir") + "/src/main");
        tomcat.getConnector();  
        tomcat.start();
    }

启动日志如下：

访问接口：http://localhost:8080/boot/test

至此，springmvc整合嵌入式tomcat成功。