创建springboot项目,maven工程，打包方式为jar包
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.3.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<!-- servlet 依赖. 想在springboot中使用容器对象，必须引入此依赖-->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>
下面所有操作能被springboot接管，必须在主启动类上加@ServletComponentScan注解
package com.boot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@SpringBootApplication
@ServletComponentScan//扫描当前包及其子包下的所有Servlet、Filter、Listener
public class StartApplication {
public static void main(String[] args) {
SpringApplication.run(StartApplication.class, args);
}
}
1、配置servlet
创建一个MyServlet类，继承HttpServlet类
package com.boot.servlet;
import java.io.IOException;
import java.io.PrintWriter;
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(urlPatterns = "/myServlet")
public class MyServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 创建响应输出流
PrintWriter out = response.getWriter();
// 向客户端响应信息
out.println("<html>");
out.println(" <head><title>Servlet</title></head>");
out.println(" <body>");
out.println("你好，欢迎来到Servlet的世界！");
out.println(" </body>");
out.println("</html>");
// 关闭响应输出流
out.close();
}
}
2、配置Filter
创建一个MyFilter类，实现Filter接口
package com.boot.filter;
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;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebFilter(urlPatterns="/*")
public class MyFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
throws IOException, ServletException {
//功能
System.out.println("过滤器执行了……");
HttpServletRequest request = (HttpServletRequest)req;
HttpServletResponse response = (HttpServletResponse)resp;
//设置请求信息的字符编码（必须在使用request之前进行设置）
request.setCharacterEncoding("utf-8");
//使客户端浏览器并根据不同的MIME调用浏览器内不同的程序嵌入模块来处理相应的数据。
response.setContentType("text/html;charset=utf-8");
//设置响应信息的字符编码（必须在创建响应输出流之前进行设置）
response.setCharacterEncoding("utf-8");
//调用过滤器链中的下一个资源
chain.doFilter(request, response);
}
@Override
public void destroy() {
}
}
3、配置Listener
创建一个MyListener类，实现ServletContextListener接口
package com.boot.listener;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
@WebListener
public class MyListener implements ServletContextListener {
// 服务器启动时会自动触发此方法
@Override
public void contextInitialized(ServletContextEvent sce) {
System.out.println("服务启动了...");
}
// 服务器停止时会自动触发此方法
@Override
public void contextDestroyed(ServletContextEvent sce) {
System.out.println("服务停止了...");
}
}
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