创建一个springboot工程最小化代码

compile 'org.springframework.boot:spring-boot-starter-web:1.4.0.RELEASE'

compile 'net.sf.json-lib:json-lib:2.4:jdk15'

compile 'org.apache.httpcomponents:httpcore:4.4.10'
compile 'org.apache.httpcomponents:httpmime:4.5.6'
compile 'org.apache.httpcomponents:httpclient:4.5.6'

<groupId>net.sf.json-lib</groupId>    
<artifactId>json-lib</artifactId>    
<version>2.4</version>    
<classifier>jdk15</classifier>    

最小代码的springboot工程：

settings.gradle:

/*

• This settings file was generated by the Gradle 'init' task.

*

• The settings file is used to specify which projects to include in your build.
• In a single project build this file can be empty or even removed.

*

• Detailed information about configuring a multi-project build in Gradle can be found
• in the user guide at https://docs.gradle.org/4.3/userguide/multi_project_builds.html

*/

/*
// To declare projects as part of a multi-project build use the 'include' method
include 'shared'
include 'api'
include 'services:webservice'
*/

rootProject.name = 'testcase'

build.gradle

apply plugin: 'java-library'
apply plugin: 'org.springframework.boot'

buildscript {

repositories {
    maven {
        name 'Aliyun Maven Repository'
        url "http://maven.aliyun.com/nexus/content/groups/public/"
    }
}
dependencies {
    classpath "org.springframework.boot:spring-boot-gradle-plugin:1.5.18.RELEASE"
    classpath "io.spring.gradle:dependency-management-plugin:1.0.5.RELEASE"
}

}
// In this section you declare where to find the dependencies of your project
repositories {

maven {
    name 'Aliyun Maven Repository'
    url "http://maven.aliyun.com/nexus/content/groups/public/"
}
jcenter()

}

springBoot {

executable = true
mainClass = 'com.casetest.TestCaseBoot'

}

dependencies {

//Spring boot
compile 'org.springframework.boot:spring-boot-starter-web:1.5.18.RELEASE'

// Swagger2
compile 'io.github.swagger2markup:swagger2markup:1.3.3'
compile 'io.springfox:springfox-swagger2:2.9.0'
compile 'io.springfox:springfox-swagger-ui:2.9.0'

api 'org.apache.commons:commons-math3:3.6.1'

implementation 'com.google.guava:guava:23.0'

testImplementation 'junit:junit:4.12'

}

src下的文件：

package com.casetest;

import java.io.IOException;
import java.util.ArrayList;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.context.annotation.Bean;

import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@EnableSwagger2
@SpringBootApplication
@ServletComponentScan //启动器启动时，扫描本目录以及子目录带有的webservlet注解的
public class TestCaseBoot {

public static void main(String[] args) throws IOException {
    SpringApplication.run(TestCaseBoot.class, args);
    System.out.println("success");
}


/*@Bean // 一定要加，不然这个方法不会运行 // 一定要返回ServletRegistrationBean
public ServletRegistrationBean getServletRegistrationBean() { 
    ServletRegistrationBean bean = new ServletRegistrationBean(new CaseTwoServlet()); 
    bean.addUrlMappings("/secondServlet"); // 访问路径值
    return bean;
}*/

@Bean
public Docket docket() {
    return new Docket(DocumentationType.SWAGGER_2).groupName("agent").select()
            .apis(RequestHandlerSelectors.basePackage("com.casetest"))
            .paths(PathSelectors.any())
            .paths(PathSelectors.ant("/api/**/*"))
            .build()
            .apiInfo(new ApiInfo("API", "这App等相关的API", "v3", "Terms of service",
                    new Contact("Test", "http://www.testcase.com", ""), "", "", new ArrayList<>()));
}

}

package com.casetest.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
@ComponentScan({

"com.casetest.rs", 
"com.casetest.schedule",
"com.casetest.service"

})
public class WebAutoConfiguration {

@Bean
public RestTemplate restTemplate() {
    return new RestTemplate();
}

}

package com.casetest.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@Configuration
public class WebMvcConfiguration extends WebMvcConfigurerAdapter {

@Override
public void addCorsMappings(CorsRegistry registry) {
    registry.addMapping("/**")
            .allowedOrigins("*")
            .allowedMethods("POST", "GET", "PUT", "OPTIONS", "DELETE")
            .maxAge(3600)
            .allowCredentials(true);
}

}

package com.casetest.rs;

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

@RequestMapping("/api/case/one")
@RestController
public class CaseOneRS {

@RequestMapping(value="/sayHi",method= {RequestMethod.GET})
public String sayHi(String name) {
    return "Hi " + name;
}

@RequestMapping(value="/sayHi",method= {RequestMethod.POST})
public String replyHi(String name) {
    return "me to " + name;
}

}

package com.casetest.rs;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(urlPatterns="/api/case/two",loadOnStartup=1)
public class CaseTwoServlet extends HttpServlet{

/**
 * 
 */
private static final long serialVersionUID = 1L;

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    System.out.println("get....");
    super.doGet(req, resp);
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    System.out.println("post....");
    super.doPost(req, resp);
}

}