spring boot servlet 注入

spring boot 注入servlet的方法是借助ServletRegistrationBean这个类

例子如下:

先建一个servlet

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;

public class TestServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("你的特殊的servlet。。。哦....");
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}

然后注入即可:

    @Bean
    public TestServlet servlet(){
        return new TestServlet();
    }

    @Bean
    public ServletRegistrationBean testServlet(TestServlet servlet) {
        ServletRegistrationBean registration = new ServletRegistrationBean(servlet);
        registration.setEnabled(true);
        registration.addUrlMappings("/servlet/test");
        return registration;
    }

最后访问的接口地址即可看见效果了

这种运用场景是当你的项目引用第三方插件的时候注入servlet的时候产生，或者你不用springmvc。