pom.xml
<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>active</groupId>
<artifactId>spring-mvc-test</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>9.4.12.v20180830</version>
</plugin>
</plugins>
</build>
</project>
当运行 mvn jetty:run 的时候会启动Jetty。在Jetty启动的时候,会扫描ServletContainerInitializer实现类。扫描到spring-web-5.0.5.RELEASE.jar包内部的
/META/services/javax.servlet.ServletContainerInitializer
接着会加载
org.springframework.web.SpringServletContainerInitializer
SpringServletContainerInitializer是javax.servlet.ServletContainerInitializer的实现类。@HandlesTypes表明它能处理的类型。
@HandlesTypes(WebApplicationInitializer.class)
public class SpringServletContainerInitializer implements ServletContainerInitializer {
}
SpringServletContainerInitializer 在执行时,Jetty会自动加载所有实现了WebApplicationInitializer接口的类,传给SpringServletContainerInitializer 。所以下一步,需要我们自己创建WebApplicationInitializer实现类。好在Spring已经提供了如下基础实现类:
AbstractDispatcherServletInitializer
AbstractAnnotationConfigDispatcherServletInitializer
AbstractDispatcherServletInitializer会自动加载DispatchServlet,AbstractAnnotationConfigDispatcherServletInitializer实现了Annotation。
接下来我们添加
package test;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
import test.SpringMvcWebConfig;
public class SpringMvcWebInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
@Override
protected Class<?>[] getRootConfigClasses() {
return null;
}
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class[] { SpringMvcWebConfig.class };
}
@Override
protected String[] getServletMappings() {
return new String[] { "/" };
}
}
这里面需要指定 Root ApplicationContext和 Web ApplicationContext的配置类。上面例子中,只设置了 Web ApplicationContext的配置类为 SpringMvcWebConfig。
下面定义 SpringMvcWebConfig:
@Configuration
@ComponentScan
@EnableWebMvc
public class SpringMvcWebConfig implements WebMvcConfigurer {
@Bean
public InternalResourceViewResolver resolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/WEB-INF/views/");
resolver.setSuffix(".jsp");
return resolver;
}
}
@Configuration 表明这是一个Spring 配置类。
@ComponentScan,表示需要自动扫描,
@EnableWebMvc,将上一步扫描到的Bean,解析为SpringMVC对应的部件。
接下来定义自己的Controller。略。