OpenApi3规范——Jersey集成swagger-jaxrs2实践

古城微笑少年丶 2021-12-10 06:03 802阅读 0赞

>       OpenAPI规范（OpenAPI Specification 简称OAS）是Linux基金会的一个项目，试图通过定义一种用来描述API格式或API定义的语言，来规范RESTful服务开发过程。目前V3.0版本的OpenAPI规范（也就是SwaggerV2.0规范）已经发布并开源在github上。即swagger2.0是基于 The Apache License, Version 2.0许可的OAS3.0实现。

## 一、项目构建 ##

先看下项目结构：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NzcxNDc1_size_16_color_FFFFFF_t_70][]

接着，我们直接开始创建项目吧，项目依赖如下：

<?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>
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>2.1.6.RELEASE</version>
    		<relativePath/> 
    	</parent>
    	<groupId>com.scb</groupId>
    	<artifactId>swagger3-demo</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<name>swagger3-demo</name>
    	<description>Demo project for Spring Boot</description>
    
    	<properties>
    		<java.version>1.8</java.version>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-jersey</artifactId>
    		</dependency>
    		<dependency>
    			<groupId>io.swagger.core.v3</groupId>
    			<artifactId>swagger-jaxrs2</artifactId>
    			<version>2.0.0</version>
    		</dependency>
    		<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>
    	</dependencies>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    		</plugins>
    	</build>
    
    </project>

## 二、配置 ##

1、在application.yml中做如下配置，将Jersey的根路径配置为/rest。也可以使用@ApplicationPath("/rest")配置。

spring:
      jersey:
        application-path: rest

2、JerseyConfig

package com.scb.swagger3demo.config;
    
    import com.scb.swagger3demo.resource.TestResource;
    import io.swagger.v3.jaxrs2.integration.resources.AcceptHeaderOpenApiResource;
    import io.swagger.v3.jaxrs2.integration.resources.OpenApiResource;
    import org.glassfish.jersey.server.ResourceConfig;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.stereotype.Component;
    
    @Component
    public class JerseyConfig extends ResourceConfig {
    
        @Value("${spring.jersey.application-path}")
        private String apiPath;
    
        public JerseyConfig() {
            // open api
            register(OpenApiResource.class);
            register(AcceptHeaderOpenApiResource.class);
            // resource
            register(TestResource.class);
        }
    
    }

这里需要注册两个类，OpenApiResource和AcceptHeaderOpenApiResource，用于集成Swagger。然后注册一个TestResource，作为资源对象。

3、TestResource资源类

package com.scb.swagger3demo.resource;
    
    import io.swagger.v3.oas.annotations.Operation;
    import io.swagger.v3.oas.annotations.Parameter;
    import io.swagger.v3.oas.annotations.media.Content;
    import io.swagger.v3.oas.annotations.media.Schema;
    import io.swagger.v3.oas.annotations.responses.ApiResponse;
    import org.springframework.stereotype.Component;
    
    import javax.ws.rs.*;
    import javax.ws.rs.core.MediaType;
    
    @Component
    @Path("/test")
    public class TestResource {
        @GET
        @Path("/{name}")
        @Produces(MediaType.APPLICATION_JSON)
        @Consumes(MediaType.APPLICATION_JSON)
        @Operation(summary = "OpenApi 3 test",
                tags = {"TestResource"},
                responses = {
                        @ApiResponse(description = "return Hello world",content = @Content(schema = @Schema(implementation = String.class)))
                })
        public String findByName(@Parameter(description = "name",required = true) @PathParam(value = "name") String name) {
            return "Hello world.Hey "+name;
        }
    }

到这里，一个简单的Jersey集成Swagger已经搭建完成。运行项目，访问[http://localhost:8080/rest/openapi.json][http_localhost_8080_rest_openapi.json]即可得到Api文档。

然后，我们接着看如何集成swagger-ui。

## 三、Swagger-ui集成 ##

1、swagger-ui下载

从swagger-ui官网：[https://github.com/swagger-api/swagger-ui][https_github.com_swagger-api_swagger-ui]下载zip包。然后解压缩，将dist目录下的文件按照开头**项目结构**所示复制进去。

注意：需要修改swagger-ui的index.html，在index.html中找到url，将其改为

url: "/rest/openapi.json",

这是项目openapi.json的路径。

2、配置访问swagger-ui路径

package com.scb.swagger3demo.config;
    
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.EnableWebMvc;
    import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    @Configuration
    @EnableWebMvc
    public class WebConfig implements WebMvcConfigurer {
        @Override
        public void addResourceHandlers(ResourceHandlerRegistry registry) {
            registry.addResourceHandler("/swagger-ui/**").addResourceLocations("classpath:/swagger-ui/");
        }
    }

3、新建openapi.yaml

resourcePackages:
    - com.scb.swagger3demo
    prettyPrint: true
    cacheTTL: 0
    
    openAPI:
      info:
        version: '0.0.1-SNAPSHOT'
        title: swagger3-demo
        description: 'swagger3 demo api document'
        termsOfService: http://swagger.io/terms/
        license:
          name: Apache 2.0
          url: http://www.apache.org/licenses/LICENSE-2.0.html

> There are several ways to [provide configuration][]; probably the easiest and least intrusive way is adding a yaml (or json) file named `openapi.yaml` or `openapi-configuration.yaml` to the classpath of your application。

上面是官网推荐方式来配置Swagger，也是最简单侵入最少的方式。如果你喜欢Java Config的话，也可以使用[JAX-RS Application][]来配置：

package com.scb.swagger3demo.config;
    
    import io.swagger.v3.jaxrs2.integration.JaxrsOpenApiContextBuilder;
    import io.swagger.v3.oas.integration.OpenApiConfigurationException;
    import io.swagger.v3.oas.integration.SwaggerConfiguration;
    import io.swagger.v3.oas.models.OpenAPI;
    import io.swagger.v3.oas.models.info.Contact;
    import io.swagger.v3.oas.models.info.Info;
    import io.swagger.v3.oas.models.info.License;
    import org.springframework.stereotype.Component;
    
    import javax.servlet.ServletConfig;
    import javax.ws.rs.ApplicationPath;
    import javax.ws.rs.core.Application;
    import javax.ws.rs.core.Context;
    import java.util.stream.Collectors;
    import java.util.stream.Stream;
    
    @Component
    @ApplicationPath("/rest")
    public class SwaggerConfig extends Application {
    
        public SwaggerConfig(@Context ServletConfig servletConfig) {
            super();
            OpenAPI oas = new OpenAPI();
            Info info = new Info()
                    .title("Swagger Sample App bootstrap code")
                    .description("This is a sample server Petstore server.  You can find out more about Swagger " +
                            "at [http://swagger.io](http://swagger.io) or on [irc.freenode.net, #swagger](http://swagger.io/irc/).  For this sample, " +
                            "you can use the api key `special-key` to test the authorization filters.")
                    .termsOfService("http://swagger.io/terms/")
                    .contact(new Contact()
                            .email("apiteam@swagger.io"))
                    .license(new License()
                            .name("Apache 2.0")
                            .url("http://www.apache.org/licenses/LICENSE-2.0.html"));
    
            oas.info(info);
            SwaggerConfiguration oasConfig = new SwaggerConfiguration()
                    .openAPI(oas)
                    .prettyPrint(true)
                    .resourcePackages(Stream.of("com.scb.swagger3demo").collect(Collectors.toSet()));
    
            try {
                new JaxrsOpenApiContextBuilder()
                        .servletConfig(servletConfig)
                        .application(this)
                        .openApiConfiguration(oasConfig)
                        .buildContext(true);
            } catch (OpenApiConfigurationException e) {
                throw new RuntimeException(e.getMessage(), e);
            }
    
        }
    }

更多配置方式请参考：[Swagger-2.X Configuration][provide configuration]

## 四、运行结果 ##

至此，一个完整的Jersey集成swagger已经开发完成。运行项目，访问[http://localhost:8080/swagger-ui/index.html][http_localhost_8080_swagger-ui_index.html]，即可得到如下界面：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NzcxNDc1_size_16_color_FFFFFF_t_70 1][]

相关参考：[github:Swagger 2.X Getting started][github_Swagger 2.X Getting started]

[Jersey 开发RESTful（十八） Springboot集成Jersey][Jersey _RESTful_ Springboot_Jersey]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NzcxNDc1_size_16_color_FFFFFF_t_70]: /images/20211209/4382f462b86a40cebecb4791ceabfc22.png
[http_localhost_8080_rest_openapi.json]: http://localhost:8080/rest/openapi.json
[https_github.com_swagger-api_swagger-ui]: https://github.com/swagger-api/swagger-ui
[provide configuration]: https://github.com/swagger-api/swagger-core/wiki/Swagger-2.X---Integration-and-configuration#configuration
[JAX-RS Application]: https://github.com/swagger-api/swagger-core/wiki/Swagger-2.X---Integration-and-configuration#jax-rs-application
[http_localhost_8080_swagger-ui_index.html]: http://localhost:8080/swagger-ui/index.html
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NzcxNDc1_size_16_color_FFFFFF_t_70 1]: /images/20211209/03d6acd66e0642fab27d4de670441a75.png
[github_Swagger 2.X Getting started]: https://github.com/swagger-api/swagger-core/wiki/Swagger-2.X---Getting-started
[Jersey _RESTful_ Springboot_Jersey]: https://www.jianshu.com/p/c14a9028e6e7