当使用spring-Boot时,嵌入式Servlet容器通过扫描注解的方式注册Servlet,过滤器和Servlet规范的所有监听器(如HttpSessionListener监听器)。
春季启动的主Servlet为DispatcherServlet,其默认的url模式为“/?也许我们在应用中还需要定义更多的Servlet,该如何使用SpringBoot来完成呢?
在春天引导中添加自己的Servlet有两种方法,代码注册Servlet和注解自动注册(过滤器和侦听器也是如此)。
一、代码注册通过ServletRegistrationBean, FilterRegistrationBean和ServletListenerRegistrationBean获得控制。
也可以通过实现ServletContextInitializer接口直接注册。
二,在SpringBootApplication上使用@ServletComponentScan注解后,Servlet、过滤器、监听器可以直接通过@WebServlet, @WebFilter, @WebListener注解自动注册,无需其他代码。
<强> 1。通过代码注册Servlet示例代码
1) .SpringBootSimpleApplication.Java类:
com . example,包
进口org.springframework.boot.SpringApplication;
进口org.springframework.boot.autoconfigure.SpringBootApplication;
进口org.springframework.boot.web.servlet.ServletRegistrationBean;
进口org.springframework.context.annotation.Bean;
进口com.example.servlet.MyServlet;
@SpringBootApplication
公开课SpringBootSimpleApplication {/* *
*使用代码注册Servlet(不需要@ServletComponentScan注解)
*/@ bean
公共ServletRegistrationBean ServletRegistrationBean () {
返回新ServletRegistrationBean(新MyServlet (), "/st/* ");//ServletName默认值为首字母小写,即MyServlet
}
公共静态void main (String [] args) {
SpringApplication.run (SpringBootSimpleApplication.class, args);
}
}
2) .MyServlet.java类:
包com.example.servlet;
进口java.io.IOException;
进口java.io.PrintWriter;
进口javax.servlet.ServletException;
进口javax.servlet.http.HttpServlet;
进口javax.servlet.http.HttpServletRequest;
进口javax.servlet.http.HttpServletResponse;
公开课MyServlet扩展HttpServlet {
@Override
保护无效doGet (HttpServletRequest点播,HttpServletResponse resp)抛出ServletException IOException {
System.out.println(“在在在在在在在在在在doGet () & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt;”);
doPost(要求、职责);
}
@Override
保护无效doPost (HttpServletRequest点播,HttpServletResponse resp)抛出ServletException IOException {
System.out.println(“在在在在在在在在在在doPost () & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt;”);
resp.setContentType (" text/html ");
resp.setCharacterEncoding(“utf - 8”);
PrintWriter=resp.getWriter ();
out.println (“& lt; html>”);
out.println (“& lt; head>”);
out.println (“& lt; title>你好World</title>”);
out.println (“& lt;/head>”);
out.println (“& lt; body>”);
out.println (“& lt; h2>大家好,我的名字叫Servlet”);
out.println (“& lt;/body>”);
out.println (“& lt;/html>”);
}
}
<强> 2。使用注解注册Servlet示例代码
1) .SpringBootSimpleApplication.java类:
com . example,包
进口org.springframework.boot.SpringApplication;
进口org.springframework.boot.autoconfigure.SpringBootApplication;
进口org.springframework.boot.web.servlet.ServletComponentScan;
进口org.springframework.boot.web.servlet.ServletRegistrationBean;
进口org.springframework.context.annotation.Bean;
进口com.example.servlet.MyServlet;
@SpringBootApplication
@ServletComponentScan
公开课SpringBootSimpleApplication {/* *
*使用代码注册Servlet(不需要@ServletComponentScan注解)
*/@ bean
公共ServletRegistrationBean ServletRegistrationBean () {
返回新ServletRegistrationBean(新MyServlet (), "/st/* ");//ServletName默认值为首字母小写,即MyServlet
}
公共静态void main (String [] args) {
SpringApplication.run (SpringBootSimpleApplication.class, args);
}
}
2) .MyServlet2.java类:
包com.example.servlet;
进口java.io.IOException;
进口java.io.PrintWriter;
进口javax.servlet.ServletException;
进口javax.servlet.annotation.WebServlet;
进口javax.servlet.http.HttpServlet;
进口javax.servlet.http.HttpServletRequest;
进口javax.servlet.http.HttpServletResponse;//不指定名字的情况下,名字默认值为类全路径,即com.example.servlet.MyServlet2
@WebServlet (urlpattern="/st/myservlet2 ",描述=盨ervlet的说明”)
公开课Myservlet2扩展HttpServlet {
@Override
保护无效doGet (HttpServletRequest点播,HttpServletResponse resp)抛出ServletException IOException {
System.out.println(“在在在在在在在在在在doGet2 () & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt;”);
doPost(要求、职责);
}
@Override
保护无效doPost (HttpServletRequest点播,HttpServletResponse resp)抛出ServletException IOException {
System.out.println(“在在在在在在在在在在doPost2 () & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt;”);
resp.setContentType (" text/html ");
resp.setCharacterEncoding(“utf - 8”);
PrintWriter=resp.getWriter ();
out.println (“& lt; html>”);
out.println (“& lt; head>”);
out.println (“& lt; title>你好World</title>”);
out.println (“& lt;/head>”);
out.println (“& lt; body>”);
out.println (“& lt; h2>大家好,我的名字叫Servlet2
