1,职责
①,参看官网对java配置容器的介绍
https://docs.spring.io/spring/docs/5.1.0.BUILD-SNAPSHOT/spring-framework-reference/web.html#mvc-servlet-context-hierarchy
②,官方推荐,实现父子容器对整个应用进行管理,即根容器扫描service层,和repository层组件,web容器扫描web相关组件如controller,@ControllerAdvice
③,pom.xml
<dependencies>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.0.6.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.1</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
2,根容器
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.context.annotation.FilterType;
//扫描service层,和repository层组件
@ComponentScan(basePackages="com.spring",
excludeFilters= {@Filter(type=FilterType.ANNOTATION,classes= {Controller.class,ControllerAdvice.class,ControllerAdvice.class})}
)
public class RootConig {
}
3,web容器
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.ViewResolverRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import com.spring.interceptor.MyInterceptor;
import org.springframework.context.annotation.FilterType;
@ComponentScan(basePackages="com.spring",
includeFilters= {@Filter(type=FilterType.ANNOTATION,classes= {Controller.class,ControllerAdvice.class})}
,useDefaultFilters=false
)
@EnableWebMvc
public class WebConig implements WebMvcConfigurer{
// 配置视图解析器
@Override
public void configureViewResolvers(ViewResolverRegistry registry) {
registry.jsp();
}
// 允许静态资源被访问
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
// 注册拦截器
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new MyInterceptor());
}
}
4,拦截器
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;
public class MyInterceptor implements HandlerInterceptor{
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
System.out.println("我是前置拦截");
return HandlerInterceptor.super.preHandle(request, response, handler);
}
}
5,webmvc大管家
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
import com.spring.config.RootConig;
import com.spring.config.WebConig;
public class MyWebInitialize extends AbstractAnnotationConfigDispatcherServletInitializer{
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class[] {RootConig.class};
}
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class[] {WebConig.class};
}
@Override
protected String[] getServletMappings() {
return new String[] {"/"};
}
}
6,controller
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HomeController {
@RequestMapping("/index")
public String index() {
return "index";
}
}
7,index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>index page</h1>
<img alt="" src="dm.jpg"/>
</body>
</html>