Spring-Boot 整合 J2EE Web组件

一，整合Servlet

1，通过注解扫描完成Servlet组件的注册

1.1编写servlet

/**
*SpringBoot整合Servlet方式一
*
*<servlet>
*<servlet-name>FirstServlet</servlet-name>
*<servlet-class>com.bjsxt.servlet.FirstServlet</servlet-class>
*</servlet>
*
*<servlet-mapping>
* <servlet-name>FirstServlet</servlet-name>
* <url-pattern>/first</url-pattern>
*</servlet-mapping>
*
*/

@WebServlet(name="FirstServlet",urlPatterns="/first")
public class FirstServlet extendsHttpServlet {

  @Override
  protected voiddoGet(HttpServletRequest req, HttpServletResponse resp) throwsServletException, IOException {
    // TODOAuto-generated method stub
    super.doGet(req, resp);
  }
}

1.2编写启动类

这里启动类就一个普通的启动类

/**
* SpringBoot整合Servlet方式一
*
*
*/
@SpringBootApplication
@ServletComponentScan //在springBoot启动时会扫描@WebServlet，并将该类实例化
public classApp {

  public static voidmain(String[] args) {
  	SpringApplication.run(App.class, args);
  }

}

2，通过方法完成Servlet组件的注册

2.1编写servlet

这里Servlet没有额外的标签

/**
*SpringBoot整合Servlet方式二
*
*/

public class SecondServlet extendsHttpServlet {

  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throwsServletException, IOException {
  System.out.println("SecondServlet..........");
  }

}

2.2编写启动类

通过@Bean，增加Servlet的Bean的注册

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;

import com.bjsxt.servlet.SecondServlet;

/**
 * SpringBoot整合Servlet方式二
 *
 *
 */
@SpringBootApplication
public class App2 {

	public static void main(String[] args) {
		SpringApplication.run(App2.class, args);
	}
	
	@Bean
	public ServletRegistrationBean getServletRegistrationBean(){
		ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());
		bean.addUrlMappings("/second");
		return bean;
	}
}

二，整合Filter

1，通过注解扫描完成Filter组件的注册

1.1编写Filter

/**
*SpringBoot整合Filter 方式一
*<filter>
*<filter-name>FirstFilter</filter-name>
*<filter-class>com.bjsxt.filter.FirstFilter</filter-class>
*</filter>
*<filter-mapping>
*<filter-name>FirstFilter</filter-name>
*<url-pattern>/first</url-pattern>
*</filter-mapping>
*/
//@WebFilter(filterName="FirstFilter",urlPatterns={"*.do","*.jsp"})
@WebFilter(filterName="FirstFilter",urlPatterns="/first")
public classFirstFilter implementsFilter {

@Override
public voiddestroy() {
// TODOAuto-generated method stub

}
@Override
public voiddoFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
throwsIOException, ServletException {
System.out.println("进入Filter");
arg2.doFilter(arg0, arg1);
System.out.println("离开Filter");
}

@Override
public voidinit(FilterConfig arg0) throwsServletException {
// TODOAuto-generated method stub
}
}

1.2编写启动类

/**
*SpringBoot整合Filter 方式一
*
*/
@SpringBootApplication
@ServletComponentScan
public classApp {

public static voidmain(String[] args) {
SpringApplication.run(App.class, args);

}

}

2，通过方法完成Filter组件的注册

2.1编写Filter

/**
* 
*SpringBoot整合Filter 方式二
*
*/
public classSecondFilter implementsFilter {
@Override
public voiddestroy() {
// TODOAuto-generated method stub
}
@Override
public voiddoFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
throwsIOException, ServletException {
System.out.println("进入SecondFilter");
arg2.doFilter(arg0, arg1);
System.out.println("离开SecondFilter");
}

@Override
public voidinit(FilterConfig arg0) throwsServletException {
// TODOAuto-generated method stub
}
}

2.2编写启动类

/**
* SpringBoot整合Filter方式二
*
*
*/
@SpringBootApplication
public classApp2 {

public static voidmain(String[] args) {
SpringApplication.run(App2.class, args);
}

/**
* 注册Servlet
* @return
*/
@Bean
publicServletRegistrationBean getServletRegistrationBean(){
ServletRegistrationBean bean= newServletRegistrationBean(newSecondServlet());
bean.addUrlMappings("/second");
return bean;
}

/**
* 注册Filter
*/
@Bean
publicFilterRegistrationBean getFilterRegistrationBean(){
FilterRegistrationBean bean= newFilterRegistrationBean(newSecondFilter());
//bean.addUrlPatterns(new String[]{"*.do","*.jsp"});
bean.addUrlPatterns("/second");
return bean;
}
}

三，整合Listener

1，通过注解扫描完成Listener组件的注册

1.1编写Listener

/**
* springBoot整合Listener
*
*<listener>
*<listener-class>com.bjsxt.listener.FirstListener</listener-class>
*</listener>
*/
@WebListener
public classFirstListener implementsServletContextListener {

@Override
public voidcontextDestroyed(ServletContextEvent arg0) {
// TODOAuto-generated method stub

}

@Override
public voidcontextInitialized(ServletContextEvent arg0) {
System.out.println("Listener...init......");

}

}

1.2编写启动类

/**
* springBoot整合Listener方式一
*
*
*/
@SpringBootApplication
@ServletComponentScan
public classApp {

public static voidmain(String[] args) {
SpringApplication.run(App.class, args);
}

}

2. 通过方法完成Listener组件注册

2.1编写Listener

/**
* springBoot整合Listener方式二。
*
*
*/
public classSecondListener implementsServletContextListener {

@Override
public voidcontextDestroyed(ServletContextEvent arg0) {
// TODOAuto-generated method stub
}

@Override
public voidcontextInitialized(ServletContextEvent arg0) {
System.out.println("SecondListener..init.....");
}

}

2.2编写启动类

/**
* SpringBoot整合Listener方式二
*
*
*/
@SpringBootApplication
public classApp2 {

public static voidmain(String[] args) {
SpringApplication.run(App2.class, args);

}
/**
* 注册listener
*/
@Bean
publicServletListenerRegistrationBean<SecondListener> getServletListenerRegistrationBean(){
ServletListenerRegistrationBean<SecondListener> bean= newServletListenerRegistrationBean<SecondListener>(newSecondListener());
return bean;
}
}

四，访问静态资源

1. SpringBoot从classpath/static的目录

注意目录名称必须是static