eclipse 使用maven 构建springboot+注入servlet

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本文转载至：http://www.cnblogs.com/java-zhao/p/5775103.html

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.zzg.springbootone.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("zhouzhigang servlet");    }    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        this.doGet(req, resp);    }}

2、Testservlet2（第二个servlet）

package com.zzg.springbootone.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("zhouzhigang 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.zzg.springbootone.servlet;import org.springframework.boot.context.embedded.ServletRegistrationBean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic 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:8080/servlet/test","http://localhost:8080/servlet/test2"，查看console的输出。

截图如下：

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