springboot注入servlet的方法

网友投稿 227 2023-05-16


springboot注入servlet的方法

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(HttpSePnbCuRzrvletRequest 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){

ServletRegistrationPnbCuRzBean 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。


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