1. Method 1 (using annotations)
First, we write a Servlet. The requirement is to simply print a sentence.
Use the @WebServlet annotation above the MyServlet class to create a Servlet.
package com.songzihao.springboot.servlet; 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; /** * */ @WebServlet(urlPatterns = "/myservlet") public class MyServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.getWriter().println("My SpringBoot Servlet-1"); resp.getWriter().flush(); resp.getWriter().close(); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req, resp); } }
Then use the annotation @ServletComponentScan annotation above the entry class of the SpringBoot project to scan the annotations in the Servlet.
package com.songzihao.springboot; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.web.servlet.ServletComponentScan; @SpringBootApplication //开启spring配置 @ServletComponentScan(basePackages = "com.songzihao.springboot.servlet") public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } }
Finally start the test.
#2. Method 2 (define configuration class)
Still write a Servlet first. No annotations are used this time.
package com.songzihao.springboot.servlet; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; /** * */ public class MyServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.getWriter().println("My SpringBoot Servlet-2"); resp.getWriter().flush(); resp.getWriter().close(); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req, resp); } }
Then write a configuration class! ! !
The @Configuration annotation is used above this class. The table name of this class is a configuration class, which is equivalent to various previous xml configuration files.
Use the @Bean annotation above the method in the class. ServletRegistrationBean is equivalent to a Servlet registration class, similar to the previous
package com.songzihao.springboot.config; import com.songzihao.springboot.servlet.MyServlet; import org.springframework.boot.web.servlet.ServletRegistrationBean; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; /** * */ @Configuration //该注解将此类定义为一个配置类(相当于一个xml配置文件) public class ServletConfig { /** * @Bean 是一个方法级别上的注解,主要用在配置类里 * 相当于一个 <beans> * <bean id="..." class="..." /> * </beans> * @return */ @Bean public ServletRegistrationBean myServletRegistrationBean() { ServletRegistrationBean servletRegistrationBean=new ServletRegistrationBean( new MyServlet(),"/myservlet" ); return servletRegistrationBean; } }
Finally start the test.
package com.songzihao.springboot; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } }
The above is the detailed content of How to use Servlet in SpringBoot. For more information, please follow other related articles on the PHP Chinese website!

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