目录
1、SpringBoot整合Servlet
1.1、第一种方式
1.2、第二种方式
2、SpringBoot整合Filter
2.1、第一种方式
2.2、第二种方式
3、SpringBoot整合listener
3.1、第一种方式
3.2、第二种方式
4、SpringBoot实现热部署
1、SpringBoot整合Servlet
1.1、第一种方式
首先自定义servlet类
package com.lichong.demo;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
@WebServlet(name = "fistServlet", urlPatterns = "/first")
public class FirstServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("FirstServlet running ...");
PrintWriter out = resp.getWriter();
out.write("success");
out.flush();
out.close();
}
}
在启动类中添加扫描注解
package com.lichong;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@SpringBootApplication
@ServletComponentScan()
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
请求路径为：http://localhost:8080/first
1.2、第二种方式
创建自定义servlet，不需要@WebServlet注解
package com.lichong.demo;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
public class SecondServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("SecondServlet running ...");
PrintWriter out = resp.getWriter();
out.write("success");
out.flush();
out.close();
}
}
在启动类中进行Bean注册
package com.lichong;
import com.lichong.demo.SecondServlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
@ServletComponentScan()
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
@Bean
public ServletRegistrationBean getServletRegistrationBean() {
ServletRegistrationBean registrationBean = new ServletRegistrationBean(new SecondServlet());
registrationBean.addUrlMappings("/second");
return registrationBean;
}
}
请求路径为：http://localhost:8080/second
2、SpringBoot整合Filter
2.1、第一种方式
自定义类filter
package com.lichong.demo;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
@WebFilter(urlPatterns = "/first")
public class FirstFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
filterChain.doFilter(servletRequest, servletResponse);
}
@Override
public void destroy() {
}
}
在启动类中增加注解
package com.lichong;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@SpringBootApplication
@ServletComponentScan
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
2.2、第二种方式
自定义filter类，不再使用@WebFilter注解
package com.lichong.demo;
import javax.servlet.*;
import java.io.IOException;
public class SecondFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
filterChain.doFilter(servletRequest, servletResponse);
}
@Override
public void destroy() {
}
}
在启动类中进行Bean注册
package com.lichong;
import com.lichong.demo.SecondFilter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
@ServletComponentScan
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
@Bean
public FilterRegistrationBean getFilterRegistrationBean() {
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new SecondFilter());
filterRegistrationBean.addUrlPatterns("/second");
return filterRegistrationBean;
}
}
3、SpringBoot整合listener
3.1、第一种方式
自定义类，继承ServletContextListener
package com.example.demo;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
@WebListener
public class FirstListener implements ServletContextListener {
@Override
public void contextInitialized(ServletContextEvent sce) {
System.out.println("初始化");
}
@Override
public void contextDestroyed(ServletContextEvent sce) {
System.out.println("结束");
}
}
在启动类中增加注解
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@SpringBootApplication
@ServletComponentScan
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
3.2、第二种方式
自定义类，去除@WebListener
package com.example.demo;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
public class SecondListener implements ServletContextListener {
@Override
public void contextInitialized(ServletContextEvent sce) {
System.out.println("初始化");
}
@Override
public void contextDestroyed(ServletContextEvent sce) {
System.out.println("结束");
}
}
在启动类中进行Bean注册
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
@ServletComponentScan
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
@Bean
public ServletListenerRegistrationBean getServletListenerRegistrationBean(){
ServletListenerRegistrationBean registrationBean = new ServletListenerRegistrationBean(new SecondListener());
return registrationBean;
}
}
4、SpringBoot实现热部署
点击file按钮，点击settings选项
点击Build project automatically
快捷键：ctrl+shift+alt+‘/’，点击Registry
勾选compiler.automake.allow.when.app.running
添加spring-boot-devtools依赖
org.springframework.boot spring-boot-devtools
在pom文件中增加新参数
org.springframework.boot spring-boot-maven-plugintrue
