「SpringCloud」(六)使用knife4j集成Swagger2接口文档

knife4j是为集成Swagger生成api文档的增强解决方案，前后端Java代码以及前端Ui模块进行分离,在微服务架构下使用更加灵活，提供专注于Swagger的增强解决方案,不同于只是改善增强前端Ui部分，我们这里使用knife4j作为文档管理工具来代替swagger-ui。

1、在GitEgg-Platform工程下新建gitegg-platform-swagger子工程，在GigEgg-Platform中的子工程gitegg-platform-bom中，修改pom

.xml，以maven bom的方式使用knife4j:

<!-- Swagger2 knife4j bom方式引入 -->
<dependency>
     <groupId>com.github.xiaoymin</groupId>
     <artifactId>knife4j-dependencies</artifactId>
     <version>${knife4j.version}</version>
     <type>pom</type>
     <scope>import</scope>
</dependency>

2、在gitegg-platform-swagger子工程中的pom.xml添加knife4j引用：

<?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">
    <parent>
        <artifactId>GitEgg-Platform</artifactId>
        <groupId>com.gitegg.platform</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>gitegg-platform-swagger</artifactId>
    <name>${project.artifactId}</name>
    <version>${project.parent.version}</version>
    <packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>knife4j-spring-boot-starter</artifactId>
        </dependency>
    </dependencies>
</project>

3、在gitegg-platform-swagger子工程中新建SwaggerConfig.java文件：

package com.gitegg.platform.swagger.config;
import com.github.xiaoymin.knife4j.spring.annotations.EnableKnife4j;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import springfox.bean.validators.configuration.BeanValidatorPluginsConfiguration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
@Configuration
@EnableSwagger2
@EnableKnife4j
@Import(BeanValidatorPluginsConfiguration.class)
public class SwaggerConfig {
    @Bean(value = "GitEggApi")
    public Docket GitEggApi() {
        Docket docket=new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                //分组名称
                .groupName("2.X版本")
                .select()
                //这里指定Controller扫描包路径
                .apis(RequestHandlerSelectors.basePackage("com.gitegg.*.*.controller"))
                .paths(PathSelectors.any())
                .build();
        return docket;
    }
    private ApiInfo apiInfo() {
        return new ApiInfoBuilder().version("1.0.0")
                .title("Spring Cloud Swagger2 文档")
                .description("Spring Cloud Swagger2 文档")
                .termsOfServiceUrl("www.gitegg.com")
                .build();
    }
}

4、在gitegg-service工程中引入gitegg-platform-swagger

<?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">
    <parent>
        <artifactId>GitEgg-Cloud</artifactId>
        <groupId>com.gitegg.cloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>gitegg-service</artifactId>
    <packaging>pom</packaging>
    <modules>
        <module>gitegg-service-base</module>
        <module>gitegg-service-bigdata</module>
        <module>gitegg-service-system</module>
    </modules>
    <dependencies>
        <!-- gitegg数据库驱动及连接池 -->
        <dependency>
            <groupId>com.gitegg.platform</groupId>
            <artifactId>gitegg-platform-db</artifactId>
        </dependency>
        <!-- gitegg mybatis-plus -->
        <dependency>
            <groupId>com.gitegg.platform</groupId>
            <artifactId>gitegg-platform-mybatis</artifactId>
        </dependency>
        <!-- gitegg swagger2-knife4j -->
        <dependency>
            <groupId>com.gitegg.platform</groupId>
            <artifactId>gitegg-platform-swagger</artifactId>
        </dependency>
        <!-- spring boot web核心包 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- spring boot 健康监控 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>
</project>

5、在gitegg-service-system工程下的SystemController.java类里面添加Swagger2相关注解

package com.gitegg.service.system.controller;
import com.gitegg.service.system.service.ISystemService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.AllArgsConstructor;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping(value = "system")
@AllArgsConstructor
@Api(tags = "gitegg-system")
public class SystemController {
    private final ISystemService systemService;
    @GetMapping(value = "list")
    @ApiOperation(value = "system list接口")
    public Object list() {
        return systemService.list();
    }
    @GetMapping(value = "page")
    @ApiOperation(value = "system page接口")
    public Object page() {
        return systemService.page();
    }
}

6、GitEggSystemApplication.java加入组件扫描的注解，让Spring在启动的时候加载到swagger2的配置:

package com.gitegg.service.system;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
/**
 * gitegg-system 启动类
 */
@ComponentScan(basePackages = "com.gitegg")
@MapperScan("com.gitegg.*.*.mapper")
@SpringBootApplication
public class GitEggSystemApplication {
    public static void main(String[] args) {
        SpringApplication.run(GitEggSystemApplication.class,args);
    }
}

7、运行gitegg-service-system，打开浏览器访问：http://127.0.0.1:8001/doc.html，可以看到swagger2文档界面

源码在https://gitee.com/wmz1930/GitEgg 的chapter-06分支。