【Spring】构建Springboot项目 实现restful风格接口

时间：2023-03-08 21:57:26

项目代码如下：

 package hello;

 import org.springframework.boot.SpringApplication;

 import org.springframework.boot.autoconfigure.SpringBootApplication;

 @SpringBootApplication  // same as @Configuration @EnableAutoConfiguration @ComponentScan

 public class Application {

     public static void main(String[] args) {

          SpringApplication.run(Application.class, args);

     }

 }
 package hello;

 public class Greeting {

 private  long id;

 private  String content;

 public Greeting(long id, String content) {

     super();

     this.id = id;

     this.content = content;

 }

 public long getId() {

     return id;

 }

 public void setId(long id) {

     this.id = id;

 }

 public String getContent() {

     return content;

 }

 public void setContent(String content) {

     this.content = content;

 }

 }
 package hello;

 import java.util.concurrent.atomic.AtomicLong;

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

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

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

 @RestController // shorthand for @Controller and @ResponseBody rolled together

 public class GreetingController {

     private static final String template="Hello,%s!";

     private final AtomicLong counter=new AtomicLong();

     @RequestMapping("/greeting")

     public Greeting greeting(@RequestParam(value="name",defaultValue="World")String name){

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

         return new Greeting(counter.incrementAndGet(),String.format(template, name));

     }

 }
 <?xml version="1.0" encoding="UTF-8"?>

 <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/xsd/maven-4.0.0.xsd">

     <modelVersion>4.0.0</modelVersion>

     <groupId>com.slp</groupId>

     <artifactId>restSpringDemo1</artifactId>

     <version>0.1.0</version>

     <parent>

         <groupId>org.springframework.boot</groupId>

         <artifactId>spring-boot-starter-parent</artifactId>

         <version>1.4.1.RELEASE</version>

     </parent>

     <dependencies>

         <dependency>

             <groupId>org.springframework.boot</groupId>

             <artifactId>spring-boot-starter-web</artifactId>

         </dependency>

         <dependency>

             <groupId>org.springframework.boot</groupId>

             <artifactId>spring-boot-starter-test</artifactId>

             <scope>test</scope>

         </dependency>

         <dependency>

             <groupId>com.jayway.jsonpath</groupId>

             <artifactId>json-path</artifactId>

             <scope>test</scope>

         </dependency>

     </dependencies>

     <properties>

         <java.version>1.8</java.version>

     </properties>

     <build>

         <plugins>

             <plugin>

                 <groupId>org.springframework.boot</groupId>

                 <artifactId>spring-boot-maven-plugin</artifactId>

             </plugin>

         </plugins>

     </build>

     <repositories>

         <repository>

             <id>spring-releases</id>

             <url>https://repo.spring.io/libs-release</url>

         </repository>

     </repositories>

     <pluginRepositories>

         <pluginRepository>

             <id>spring-releases</id>

             <url>https://repo.spring.io/libs-release</url>

         </pluginRepository>

     </pluginRepositories>

 </project>

在Application.java中run as java application 出现：

  .   ____          _            __ _ _

  /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \

 ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \

  \\/  ___)| |_)| | | | | || (_| |  ) ) ) )

   '  |____| .__|_| |_|_| |_\__, | / / / /

  =========|_|==============|___/=/_/_/_/

  :: Spring Boot ::        (v1.4.1.RELEASE)

 2016-10-13 11:19:16.510  INFO 9864 --- [           main] hello.Application                        : Starting Application on QH-20160418YQMB with PID 9864 (started by sanglp in D:\rest风格的apring项目\restSpringDemo1)

 2016-10-13 11:19:16.525  INFO 9864 --- [           main] hello.Application                        : No active profile set, falling back to default profiles: default

 2016-10-13 11:19:16.713  INFO 9864 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@72f926e6: startup date [Thu Oct 13 11:19:16 CST 2016]; root of context hierarchy

 2016-10-13 11:19:19.691  INFO 9864 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)

 2016-10-13 11:19:19.710  INFO 9864 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat

 2016-10-13 11:19:19.710  INFO 9864 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.0.35

 2016-10-13 11:19:20.148  INFO 9864 --- [ost-startStop-1] org.apache.jasper.servlet.TldScanner     : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.

 2016-10-13 11:19:20.148  INFO 9864 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext

 2016-10-13 11:19:20.148  INFO 9864 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 3451 ms

 2016-10-13 11:19:20.382  INFO 9864 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]

 2016-10-13 11:19:20.398  INFO 9864 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]

 2016-10-13 11:19:20.398  INFO 9864 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]

 2016-10-13 11:19:20.398  INFO 9864 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]

 2016-10-13 11:19:20.398  INFO 9864 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]

 2016-10-13 11:19:20.866  INFO 9864 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@72f926e6: startup date [Thu Oct 13 11:19:16 CST 2016]; root of context hierarchy

 2016-10-13 11:19:20.986  INFO 9864 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/greeting]}" onto public hello.Greeting hello.GreetingController.greeting(java.lang.String)

 2016-10-13 11:19:20.986  INFO 9864 --- [           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)

 2016-10-13 11:19:20.986  INFO 9864 --- [           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)

 2016-10-13 11:19:21.033  INFO 9864 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]

 2016-10-13 11:19:21.033  INFO 9864 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]

 2016-10-13 11:19:21.095  INFO 9864 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]

 2016-10-13 11:19:21.307  INFO 9864 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup

 2016-10-13 11:19:21.463  INFO 9864 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)

 2016-10-13 11:19:21.479  INFO 9864 --- [           main] hello.Application                        : Started Application in 6.497 seconds (JVM running for 7.83)

 2016-10-13 11:21:46.570  INFO 9864 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring FrameworkServlet 'dispatcherServlet'

 2016-10-13 11:21:46.570  INFO 9864 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started

 2016-10-13 11:21:46.622  INFO 9864 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 51 ms

表示启动成功，这是就可以访问了 http://localhost:8080/greeting?name=xxb

会出现如下结果：

{"id":3,"content":"Hello,xuxiaobo!"}

这是一个纯java的项目，不需要启动tomcat也可以执行访问

首先你需要建立一个基本的项目，你可以使用任何你喜欢的方式去构造Spring项目，这里使用的是Maven.如果你不熟悉Maven的话请移步 Building Java Projects with Maven.

创建项目目录结构

在你所选的项目目录中，创建如下的子目录结构；例如在unix系统中使用mkdir -p src/main/java/hello。

└── src

    └── main

        └── java

            └── hello

pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<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/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>org.springframework</groupId>

    <artifactId>gs-rest-service</artifactId>

    <version>0.1.0</version>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.4.1.RELEASE</version>

    </parent>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>com.jayway.jsonpath</groupId>

            <artifactId>json-path</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <properties>

        <java.version>1.8</java.version>

    </properties>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

    <repositories>

        <repository>

            <id>spring-releases</id>

            <url>https://repo.spring.io/libs-release</url>

        </repository>

    </repositories>

    <pluginRepositories>

        <pluginRepository>

            <id>spring-releases</id>

            <url>https://repo.spring.io/libs-release</url>

        </pluginRepository>

    </pluginRepositories>

</project>

Spring Boot的maven插件提供了很多便利的特性：

  • 它包含了路径中的所有jar文件，使用“über-jar”。它使得执行和转换服务非常便利。

  • 它查询 public static void main() 方法去标志为一个可执行的类

  • 它提供了一个内置的匹配Spring boot 依赖的版本，你可以选择任何你希望的版本，但是默认情况下它会选择Boot的版本设置变量。