胖哥學SpringMVC:Hello World 註解版

胖先森發表於2018-03-12
SpringMVC

Hello World 註解版

個人建議重新練習一遍搭建的過程,如果感覺麻煩你可以直接複製上一個工程,但是需要修改pom.xml中的一點資訊

<groupId>com.hanpang.springmvc</groupId>
<artifactId>springmvc-helloword-annotation</artifactId>
<version>0.0.1-SNAPSHOT</version>
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修改artifactId即 , Controller還是用上一次的即可

配置核心的類檔案

package com.hanpang.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;

@Configuration
@EnableWebMvc
@ComponentScan(basePackages="com.hanpang.**.web")
public class SpringMvcConfiguration {

}

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等價於

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">
    <!-- 1.啟動SpringMVC註解 -->
    <mvc:annotation-driven/>
    <!-- 2.掃描註解 -->
    <context:component-scan base-package="com.hanpang.**.web"/>
</beans>

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第一種初始化載入核心類檔案

package com.hanpang.config;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

public class HelloWorldInitializer implements WebApplicationInitializer {

	@Override
	public void onStartup( ServletContext application ) throws ServletException {
		System.out.println("開始載入容器");
		AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
		ctx.register(SpringMvcConfiguration.class);//核心類
		ctx.setServletContext(application);

		ServletRegistration.Dynamic servlet = application.addServlet("dispatcher", new DispatcherServlet(ctx));

		servlet.setLoadOnStartup(2);
		servlet.addMapping("/");

	}

}
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第二種初始化載入核心類檔案

這個推薦使用

package com.hanpang.config;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class HelloWorldInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

	@Override
	protected Class<?>[] getRootConfigClasses() {
		return new Class[] {SpringMvcConfiguration.class};//核心類
	}

	@Override
	protected Class<?>[] getServletConfigClasses() {
		return null;
	}

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

}
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Tomcat7外掛執行程式

tomcat7:run -Dmaven.tomcat.uriEncoding=UTF-8 -Dmaven.tomcat.path=/ -Dmaven.tomcat.port=8080
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只要在控制檯能顯示Hello World

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