spring-javaConfig-无xml的方式

起一个maven项目，配置pom文件

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-webmvc</artifactId>
  <version>5.2.2.RELEASE</version>
</dependency>

<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>javax.servlet-api</artifactId>
  <version>4.0.1</version>
  <scope>provided</scope>
</dependency>

• servlet必须要3.0以上

配置ApplicationConfig.class,相当于spring-context.xml

package com.wyl.security.springmvc.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.stereotype.Controller;

/**
 * @Description SpringAppliction 相当于spring-context.xml
 * @Author YiLong Wu
 * @Date 2020/2/3 20:28
 * @Version 1.0.0
 */

(basePackages = "com.wyl.security"
        ,excludeFilters = {.Filter(type = FilterType.ANNOTATION,value = Controller.class)})
public class ApplictionConfig {

    // 配置除了controller以外的bean,例如：数据库连接池，业务bean,事务管理器

}

配置WebMvcConfig，相当于spring-mvc.xml

package com.wyl.security.springmvc.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.stereotype.Controller;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;

/**
 * @Description WebMvc 相当于spring-mvc.xml
 * @Author YiLong Wu
 * @Date 2020/2/3 20:35
 * @Version 1.0.0
 */

(basePackages = "com.wyl.security"
        ,includeFilters = {.Filter(type = FilterType.ANNOTATION,value = Controller.class)})
public class WebMvcConfig extends WebMvcConfigurationSupport {

    // 配置视图解析器
    
    public InternalResourceViewResolver viewResolver() {
        InternalResourceViewResolver internalResourceViewResolver = new InternalResourceViewResolver();
        internalResourceViewResolver.setPrefix("/WEB-INF/views/");
        internalResourceViewResolver.setSuffix(".jsp");
        return internalResourceViewResolver;
    }

    // 配置视图控制器，初始化web时直接访问，无需@controller
    
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("login");
    }
}

配置SpringApplicationInit,相当于web.xml

package com.wyl.security.init;

import com.wyl.security.springmvc.config.ApplictionConfig;
import com.wyl.security.springmvc.config.WebMvcConfig;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

/**
 * @Description SpringApplicationInit 相当于web.xml
 * @Author YiLong Wu
 * @Date 2020/2/3 20:44
 * @Version 1.0.0
 */
public class SpringApplicationInit extends AbstractAnnotationConfigDispatcherServletInitializer {
    // 加载spring容器  相当于加载spring-context.xml
    
    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{ApplictionConfig.class};
    }

    // 相当于加载spring-mvc.xml
    
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{WebMvcConfig.class};
    }

    // 相当于加载 url-mapping
    
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}

• web的启动 SpringApplicationInit 继承 AbstractAnnotationConfigDispatcherServletInitializer，实质上，实现了WebApplicationInitializer，从而扫描了它的子类，并加载到容器中

配置maven的tomcat7插件

<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
</plugin>