springboot注入servlet的方法
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2024-02-22 19:27:35
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...
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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