SpringMVC全注解配置笔记

编写根容器配置类

@Configuration
@ComponentScan("com.yicj.study.mvc.hello.service")
public class RootConfig {
}
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编写web容器配置类

@EnableWebMvc
@Configuration
@ComponentScan("com.yicj.study.mvc.hello.controller")
public class WebConfig {
    @Bean
    public InternalResourceViewResolver viewResolver(){
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver() ;
        viewResolver.setPrefix("/WEB-INF/jsp/");
        viewResolver.setSuffix(".jsp");
        return viewResolver ;
    }
}
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编写WebApplicationInitializer实现类,一般直接继承AbstractAnnotationConfigDispatcherServletInitializer类

// SpringServletContainerInitializer实现了ServletContainerInitializer接口
// 在SpringServletContainerInitializer的onStartup方法中会
public class StarterWebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
    // 根容器的配置类
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{RootConfig.class};
    }
    // web容器的配置类
    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{WebConfig.class};
    }
    // DispatcherServlet拦截地址
    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
    // 指定DispatcherServlet中的filter
    @Override
    protected Filter[] getServletFilters() {
        CharacterEncodingFilter encodingFilter = new CharacterEncodingFilter("UTF-8", true) ;
        return new Filter[]{encodingFilter};
    }
}
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编写业务代码，以及控制层代码

@Data
public class User {
    private Integer id ;
    private String name ;
}
//
@Service
public class UserServiceImpl implements UserService {
    @Override
    public User saveUser(User user) {
        user.setId(1);
        return user ;
    }
}
//
@Controller
public class HomeController {
    @ResponseBody
    @GetMapping("/hello")
    public String hello(){
        return "hello world" ;
    }

    @GetMapping("/helloworld")
    public String helloworld(){

        return "helloworld" ;
    }
}
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在webapp/WEB-INF/jsp/ 目录中创建helloworld.jsp

<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>hello test</title>
</head>
<body>
    Hello World!<br/>
</body>
</html>
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添加依赖

<!-- 注意这里要写war否则项目可能无法运行-->
<packaging>war</packaging>
<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <scope>provided</scope>
    </dependency>
</dependencies>
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Servlet3.x规范利用spi机制，自动加载实现ServletContainerInitializer接口的类,并调用onStartup方法。

a) SpringServletContainerInitializer实现ServletContainerInitializer接口。
b) SpringServletContainerInitializer添加@HandlesTypes(WebApplicationInitializer.class)注解,表示获取所有WebApplicationInitializer实现类。
c) 在SpringServletContainerInitializer的onStartup方法中调用WebApplicationInitializer的onSt

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