Spring 梳理 - javaConfig在App和webApp中的应用

Posted 2021-01-31 手握太阳

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package com.dxz.demo.configuration;

import org.springframework.context.annotation.Configuration;

@Configuration
public class TestConfiguration {
    public TestConfiguration() {
        System.out.println("TestConfiguration容器启动初始化。。。");
    }
}

APP

方法1

package com.dxz.demo.configuration;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class TestMain {
    public static void main(String[] args) {

        // @Configuration注解的spring容器加载方式，用AnnotationConfigApplicationContext替换ClassPathXmlApplicationContext
        ApplicationContext context = new AnnotationConfigApplicationContext(TestConfiguration.class);

        // 如果加载spring-context.xml文件：
        // ApplicationContext context = new
        // ClassPathXmlApplicationContext("spring-context.xml");
    }
}

public static void main(String[] args) {

        // @Configuration注解的spring容器加载方式，用AnnotationConfigApplicationContext替换ClassPathXmlApplicationContext
        ApplicationContext context = new AnnotationConfigApplicationContext(TestConfiguration.class);

        //获取bean
        TestBean tb = (TestBean) context.getBean("testBean");
        tb.sayHello();
    }

方法2

public static void main(String[] args) {
  ApplicationContext ctx = new AnnotationConfigApplicationContext();
  ctx.register(AppContext.class)
}

webApp

方法1

<web-app>
    <context-param>
        <param-name>contextClass</param-name>
        <param-value>
            org.springframework.web.context.
            support.AnnotationConfigWebApplicationContext
        </param-value>
    </context-param>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            demo.AppContext
        </param-value>
    </context-param>
    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>
    <servlet>
    <servlet-name>sampleServlet</servlet-name>
    <servlet-class>
        org.springframework.web.servlet.DispatcherServlet
    </servlet-class>
    <init-param>
        <param-name>contextClass</param-name>
        <param-value>
            org.springframework.web.context.
            support.AnnotationConfigWebApplicationContext
        </param-value>
    </init-param>
    </servlet>
</web-app>

方法2

package com.jt;

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

public class AppInitializer   extends AbstractAnnotationConfigDispatcherServletInitializer{
      @Override
      protected Class<?>[] getRootConfigClasses() {
        return new Class<?>[] { RootConfig.class };
      }

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

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

    }

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