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public class ServletContainersInitConfig extends AbstractDispatcherServletInitializer {
    @Override
    protected String[] getServletMappings() {//配置哪些请求给SpringMVC处理
        //表示所有的请求都由SpringMVC处理
        return new String[]{"/"};
    }

    @Override
    protected WebApplicationContext createServletApplicationContext() {
        //加载SpringMVC配置对应的容器对象
        AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
        context.register(SpringMvcConfig.class);//注册
        return context;
    }

    @Override
    protected WebApplicationContext createRootApplicationContext() {
        //加载Spring配置对应的容器对象
        return null;
    }
}


@Configuration
@ComponentScan("com.controller")
public class SpringMvcConfig {
}



@Controller
public class UserController {

    @RequestMapping("/save")
    @ResponseBody //表示返回值就是响应体
    public String save(){
        System.out.println("save...");
        return"{'info':'springMVC'}";
    }
}

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.mytest2</groupId>
    <artifactId>SpringMVC-demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.10.RELEASE</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.1</version>
            </plugin>
        </plugins>
    </build>

</project>

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public class ServletContainersInitConfig extends AbstractDispatcherServletInitializer {
    @Override
    protected String[] getServletMappings() {//配置哪些请求给SpringMVC处理
        //表示所有的请求都由SpringMVC处理
        return new String[]{"/"};
    }

    @Override
    protected WebApplicationContext createServletApplicationContext() {
        //加载SpringMVC配置对应的容器对象
        AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
        context.register(SpringMvcConfig.class);//注册
        return context;
    }

    @Override
    protected WebApplicationContext createRootApplicationContext() {
        //加载Spring配置对应的容器对象
        AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
        context.register(SpringConfig.class);//注册
        return context;
    }
}



@Configuration
@ComponentScan(value = "com", excludeFilters = @ComponentScan.Filter(type = FilterType.ANNOTATION, classes = Controller.class))
//@ComponentScan({"com.service","com.dao"})
public class SpringConfig {
}



//@Configuration
@ComponentScan("com.controller")
public class SpringMvcConfig {
}

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//简化开发
public class ServletContainersInitConfig2 extends AbstractAnnotationConfigDispatcherServletInitializer{

    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{SpringConfig.class};
    }

    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{SpringMvcConfig.class};
    }

    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}