springboot注入servlet springboot注入servlet的方法
赵计刚 人气:0想了解springboot注入servlet的方法的相关内容吗,赵计刚在本文为您仔细讲解springboot注入servlet的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:springboot注入servlet,spring,boot,servlet,spring,boot,servlet3,下面大家一起来学习吧。
问:有了springMVC,为什么还要用servlet?有了servlet3的注解,为什么还要使用ServletRegistrationBean注入的方式?
使用场景:在有些场景下,比如我们要使用hystrix-dashboard,这时候就需要注入HystrixMetricsStreamServlet(第三方的servlet),该servlet是hystrix的组件。
一、代码
1、TestServlet(第一个servlet)
package com.xxx.secondboot.servlet; import java.io.IOException; import javax.servlet.ServletException; 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 = -4619665430596950563L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { System.out.println("zhaojigang servlet"); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { this.doGet(req, resp); } }
2、Testservlet2(第二个servlet)
package com.xxx.secondboot.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class TestServlet2 extends HttpServlet { private static final long serialVersionUID = 3788279972938793265L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { System.out.println("zhaojigang servlet2"); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { this.doGet(req, resp); } }
3、ServletConfig(servlet注入配置类)
package com.xxx.secondboot.servlet; import org.springframework.boot.context.embedded.ServletRegistrationBean; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class ServletConfig { @Bean public TestServlet testServlet(){ return new TestServlet(); } @Bean public ServletRegistrationBean testServletRegistrationBean(TestServlet testServlet){ ServletRegistrationBean registration = new ServletRegistrationBean(testServlet); registration.setEnabled(true); registration.addUrlMappings("/servlet/test"); return registration; } /********************************************/ @Bean public TestServlet2 testServlet2(){ return new TestServlet2(); } @Bean public ServletRegistrationBean test2ServletRegistrationBean(TestServlet2 testServlet2){ ServletRegistrationBean registration = new ServletRegistrationBean(testServlet2); registration.setEnabled(true); registration.addUrlMappings("/servlet/test2"); return registration; } }
说明:使用ServletRegistrationBean来注入servlet,对于每一个servlet都有一个ServletRegistrationBean来注入。
注意:如果只是自己要使用servlet,可以直接只用servlet3的注解来声明servlet就好,但是像HystrixMetricsStreamServlet这样的第三方servlet,就只能通过上边这样的方式来搞了。
二、测试
启动服务,浏览器输入"http://localhost:8083/servlet/test","http://localhost:8083/servlet/test2",查看console的输出。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。
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