SpringBoot环境搭建和返回JSON 字符串

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/weixin_39053211/article/details/77967145

SpringBoot并不是对Spring功能上的一种增强，而是提供了一种快速使用spring的一种方式。开箱即用，没有代码生成，也无需 XML 配置
Maven + Spring Web 项目结构在 Eclipse 下面的实现
在 POM.XML中添加，父工程依赖，springWeb工程依赖，springBoot Maven运行编译环境

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.itxyl.springboot</groupId>
  <artifactId>SpringBoot</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>SpringBoot Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <!-- 必须应用springBoot  父工程依赖 -->
  <parent>  
    <groupId>org.springframework.boot</groupId>  
    <artifactId>spring-boot-starter-parent</artifactId>  
    <version>1.3.3.RELEASE</version>  
  </parent>  
  <!-- springWeb工程依赖     默认集成SpringMvc -->
  <dependencies>
    <dependency>  
          <groupId>org.springframework.boot</groupId>  
          <artifactId>spring-boot-starter-web</artifactId>  
      </dependency>  
  </dependencies>
  <!-- springBoot Maven运行编译环境 -->
  <build>
   <plugins>  
           <plugin>  
               <groupId>org.springframework.boot</groupId>  
               <artifactId>spring-boot-maven-plugin </artifactId>  
          </plugin>  
      </plugins>  
  </build>
</project>

添加后在编写JAVA代码

package com.itxyl.controller;


import java.util.ArrayList;
import java.util.List;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
 * @RestController标注该类的所有请求方法为 返回json字符串  不做试图解析
 * @author xuyalin
 *
 */
@RequestMapping("/springboot")
@RestController
public class IndexController {
    @RequestMapping("/index")
    public String index(){
        return "success";
    }
    @RequestMapping("/index1")
    public String index1(){
        return "success1";
    }
    @RequestMapping("/listindex")
    public List<String> listIndex(){
        List<String> list=new ArrayList<String>();
        list.add("index");
        list.add("index1");
        list.add("index5");
        System.out.println(list);
        return list;
    }

}

package com.itxyl.service;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.Component;

import com.itxyl.controller.IndexController;
/**
 * springBoot启动类
 * @author xuyalin
 *
 */
@ComponentScan(basePackages={"com.itxyl.controller"})//标示为springmvc注入类
@EnableAutoConfiguration
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

测试就直接main方法启动，如下就启动成功了，在浏览器输入测试的话就是：http://localhost:8080/springboot/listindex。根据你自己写的路径就好了。

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.3.3.RELEASE)

2017-09-13 15:46:16.700  INFO 8932 --- [           main] com.itxyl.service.Application            : Starting Application on DESKTOP-J74FCO4 with PID 8932 (D:\Java\workspace\SpringBoot\target\classes started by xuyalin in D:\Java\workspace\SpringBoot)
2017-09-13 15:46:16.703  INFO 8932 --- [           main] com.itxyl.service.Application            : No active profile set, falling back to default profiles: default
2017-09-13 15:46:16.761  INFO 8932 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@16958cd8: startup date [Wed Sep 13 15:46:16 CST 2017]; root of context hierarchy
2017-09-13 15:46:17.399  INFO 8932 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Overriding bean definition for bean 'beanNameViewResolver' with a different definition: replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]]
2017-09-13 15:46:18.009  INFO 8932 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-09-13 15:46:18.023  INFO 8932 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat
2017-09-13 15:46:18.024  INFO 8932 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.0.32
2017-09-13 15:46:18.120  INFO 8932 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2017-09-13 15:46:18.120  INFO 8932 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1362 ms
2017-09-13 15:46:18.389  INFO 8932 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean        : Mapping servlet: 'dispatcherServlet' to [/]
2017-09-13 15:46:18.391  INFO 8932 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-09-13 15:46:18.392  INFO 8932 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-09-13 15:46:18.392  INFO 8932 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-09-13 15:46:18.392  INFO 8932 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'requestContextFilter' to: [/*]
2017-09-13 15:46:18.536  INFO 8932 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@16958cd8: startup date [Wed Sep 13 15:46:16 CST 2017]; root of context hierarchy
2017-09-13 15:46:18.587  INFO 8932 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/springboot/index]}" onto public java.lang.String com.itxyl.controller.IndexController.index()
2017-09-13 15:46:18.587  INFO 8932 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/springboot/index1]}" onto public java.lang.String com.itxyl.controller.IndexController.index1()
2017-09-13 15:46:18.587  INFO 8932 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/springboot/listindex]}" onto public java.util.List<java.lang.String> com.itxyl.controller.IndexController.listIndex()
2017-09-13 15:46:18.589  INFO 8932 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2017-09-13 15:46:18.589  INFO 8932 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2017-09-13 15:46:18.623  INFO 8932 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-09-13 15:46:18.623  INFO 8932 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-09-13 15:46:18.669  INFO 8932 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-09-13 15:46:18.799  INFO 8932 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2017-09-13 15:46:18.849  INFO 8932 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-09-13 15:46:18.853  INFO 8932 --- [           main] com.itxyl.service.Application            : Started Application in 2.509 seconds (JVM running for 2.734)

@EnableAutoConfiguration为springboot程序入口，一个程序就一个入口，所以可以把他单独的拿出来。