一、静态资源
1.1、webapp默认支持静态资源
在src/main/webapp下建立user.html默认支持访问
1.2、默认内置静态资源目录。可被直接访问
查看包：spring-boot-autoconfigure-1.5.9.RELEASE.jar下的：org.springframework.boot.autoconfigure.web;
查看：ResourceProperties，其中
private static final String[] CLASSPATH_RESOURCE_LOCATIONS = {
"classpath:/META-INF/resources/", "classpath:/resources/",
"classpath:/static/", "classpath:/public/" };
默认放在以上四个目录均可被访问。
可以通过修改配置项，在src/main/resources下的application.properties中
spring.resources.staticLocations=classpath:/html/
二、spring boot中使用Servlet【原始】以来Servlet3.x注解功能
2.1、使用Servlet
新建一个UserServlet.java
package com.lhx.spring.springboot_web_ext;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/user.do")
public class UserServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.getWriter().print("user servlet");
}
}
并且在启动类上增加Servlet扫描注解：ServletComponentScan
@ServletComponentScan
@SpringBootApplication
public class App {
public static void main(String[] args) {
ConfigurableApplicationContext context = SpringApplication.run(App.class, args);
//context.close();
}
}
访问即可
2.2、使用Filter
新建一个LogFilter.java拦截User.do
package com.lhx.spring.springboot_web_ext;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
@WebFilter("/user.do")
public class LogFilter implements Filter {
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
throws IOException, ServletException {
System.out.println("income log filter " + arg0.getRemoteHost());
arg2.doFilter(arg0, arg1);
}
@Override
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
}
此时运行即可
2.3、使用Listener
package com.lhx.spring.springboot_web_ext;
import java.time.LocalDate;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
@WebListener
public class MyContextListener implements ServletContextListener {
@Override
public void contextDestroyed(ServletContextEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void contextInitialized(ServletContextEvent arg0) {
System.out.println("app startup at " + LocalDate.now().toString());
}
}
此时运行即可
三、spring boot中使用Servlet【Configuration配置】不依赖Servlet3.0,使用Servlet2.x可以使用
3.1、使用Servlet
增加BookServlet.java，注意没有注解
package com.lhx.spring.springboot_web_ext.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class BookServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("test");
}
}
增加配置类，ServletConfiguration.java
package com.lhx.spring.springboot_web_ext.servlet;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
@SpringBootConfiguration
public class ServletCongfiguration {
@Bean
public ServletRegistrationBean createBookServlet() {
ServletRegistrationBean servlet = new ServletRegistrationBean(new BookServlet(),"book.do");
return servlet;
}
}
此时访问即可。
3.2、使用Filter
增加EchoFilter.java
package com.lhx.spring.springboot_web_ext.servlet;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
public class EchoFilter implements Filter {
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) arg0;
System.out.println("test" + req.getRequestURI());
arg2.doFilter(arg0, arg1);
}
@Override
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
}
在配置类，ServletConfiguration.java增加
@Bean
public FilterRegistrationBean createFilterRegistrationBean() {
FilterRegistrationBean filter = new FilterRegistrationBean();
filter.setFilter(new EchoFilter());
filter.setUrlPatterns(Arrays.asList("/book.do"));
return filter;
}
3.3、使用Listner
增加StartupListener .java
package com.lhx.spring.springboot_web_ext.servlet;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
public class StartupListener implements ServletContextListener {
@Override
public void contextDestroyed(ServletContextEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void contextInitialized(ServletContextEvent arg0) {
System.out.println("=================");
}
}
在配置类，ServletConfiguration.java增加
@Bean
public ServletListenerRegistrationBean<StartupListener> createServletListenerRegistrationBean() {
ServletListenerRegistrationBean<StartupListener> registrationBean = new ServletListenerRegistrationBean<StartupListener>(new StartupListener());
return registrationBean;
}
注：一般使用2中注解，因为Spring boot基于spring 4.x ，spring 4.x 开发的web一般使用Servlet3.x以上
原文地址：https://www.cnblogs.com/bjlhx/p/8407097.html
时间： 2024-10-08 23:33:52