spring3.2之后开始支持java配置方式开发web项目，不使用web.xml，但需要在servlet3.0环境，一般tomcat7会支持，6不行
下图中：MyAppInitializer和SpringServletContainerInitializer是查找关系，没有继承
创建maven的web项目
容器首先会加载这个类
package org.spitter.config;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
public class MyAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer{
// 抽象类的实现类会自动地配置DispatcherServlet 和 spring 应用的上下文
@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[]{"/"};
}
}
然后是RootConfig.class
package org.spitter.config;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
@Configuration
@ComponentScan(basePackages={"org.spitter"},
excludeFilters={@Filter(type=FilterType.ANNOTATION,value=EnableWebMvc.class)})
public class RootConfig {
}
然后是WebConfig.class
package org.spitter.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
@Configuration
@EnableWebMvc
@ComponentScan(basePackages = {"org.spitter.web"})
public class WebConfig extends WebMvcConfigurerAdapter {
// 配置视图解析器
@Bean
public ViewResolver viewResolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/page/");
resolver.setSuffix(".jsp");
resolver.setExposeContextBeansAsAttributes(true);
return resolver;
}
// 配置静态资源的处理
@Override
public void configureDefaultServletHandling( DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
}
最后写一个Controller
package org.spitter.web;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
public class HomeController {
@RequestMapping(value="/myhome",method=RequestMethod.GET)
public String home(){
return "home";
}
}
这样，初始web项目完成，可以启动tomcat加载了