[Spring Boot] 使用多个Servlet

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当使用Spring boot的嵌入式servlet容器时，可以通过Spring bean或扫描Servlet组件的方式注册Servlet、Filter和Servlet规范的所有监听器(例如 HttpSessionListener )

当urlMapping不是很复杂时，可以通过 ServletRegistrationBean 、 FilterRegistrationBean 和 ServletListenerRegistrationBean 获得完整控制。如果bean实现了 ServletContextInitializer 接口的话则可以直接注册。
当使用 @ServletComponentScan 扫描Servlet组件时，Servlet、过滤器和监听器可以是通过 @WebServlet 、 @WebFilter 和 @WebListener 自动注册

Application.java

package com.yqu.multiservlet;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.context.embedded.ServletRegistrationBean;

import org.springframework.context.annotation.Bean;

import org.springframework.web.servlet.DispatcherServlet;

@SpringBootApplication

public class Application {

  public static void main(String[] args) {

    SpringApplication.run(Application.class, args);

  }

  @Bean

  public ServletRegistrationBean dispatcherRegistration(

      DispatcherServlet dispatcherServlet) {

    ServletRegistrationBean registration =

        new ServletRegistrationBean(dispatcherServlet);

    registration.addUrlMappings("/hirest/*");

    printStacks();

    return registration;

  }

  @Bean

  public ServletRegistrationBean servletRegistrationBean() {

    printStacks();

    return new ServletRegistrationBean(

        new SigninServlet(), "/signin");

  }

  private void printStacks() {

    StackTraceElement[] elements = Thread.currentThread().getStackTrace();

    System.out.println("========================");

    for (int i = 0; i < elements.length; i++) {

      System.out.println(elements[i]);

    }

  }

}

SigninServlet.java

package com.yqu.multiservlet;

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

public class SigninServlet extends HttpServlet {

  public void init(ServletConfig config)

      throws ServletException {

    super.init(config);

  }

  protected void doGet(

      HttpServletRequest request,

      HttpServletResponse response)

      throws ServletException, IOException {

    response.sendRedirect("http://blog.sina.com.cn/yandongqu");

  }

}

HelloController.java

package com.yqu.multiservlet;

import org.springframework.hateoas.ResourceSupport;

import org.springframework.http.HttpEntity;

import org.springframework.http.HttpStatus;

import org.springframework.http.ResponseEntity;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.bind.annotation.RestController;

import static org.springframework.hateoas.mvc.ControllerLinkBuilder.linkTo;

import static org.springframework.hateoas.mvc.ControllerLinkBuilder.methodOn;

@RestController

public class HelloController {

  @RequestMapping(value = "/", method = RequestMethod.GET)

  @ResponseBody

  public HttpEntity  home() {

    ResourceSupport home = new ResourceSupport();

    home.add(linkTo(methodOn(HelloController.class).home()).withSelfRel());

    return new ResponseEntity(home, HttpStatus.OK);

  }

}

application.properties

server.context-path=/HelloMultiServlet

server.port=8080

applicationDefaultJvmArgs: [

    "-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=55558"

]

build.gradle

buildscript {

    repositories {

        mavenCentral()

    }

    dependencies {

        classpath("org.springframework.boot:spring-boot-gradle-plugin:1.2.6.RELEASE")

    }

}

apply plugin: 'java'

apply plugin: 'eclipse'

apply plugin: 'idea'

apply plugin: 'spring-boot'

jar {

    baseName = 'hello-multiservlet'

    version =  '0.1.0'

}

repositories {

    mavenCentral()

}

sourceCompatibility = 1.8

targetCompatibility = 1.8

dependencies {

    compile("org.springframework.boot:spring-boot-starter-actuator")

    compile("org.springframework.boot:spring-boot-starter-web")

    compile("com.fasterxml.jackson.core:jackson-databind")

    compile("org.springframework.hateoas:spring-hateoas")

    compile("org.springframework.plugin:spring-plugin-core:1.1.0.RELEASE")

    compile("com.jayway.jsonpath:json-path:0.9.1")

}

task wrapper(type: Wrapper) {

    gradleVersion = '2.3'

}