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16、springcloud整合Swagger2构建Restful服务的APIs

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Spring Cloud将服务注册到了Eureka上，可以从Eureka的UI界面中，看到有哪些服务已经注册到了Eureka Server上；但是如果想查看当前服务提供了哪些RESTful接口方法的话，就无法从Eureka Server获取了，而传统的方法是梳理一个接口文档来供开发人员之间来进行交流。这种情况下经常会造成文档和代码的不一致性，比如说代码改了，但是接口文档还没来得及修改等问题，而Swagger2则给我们提供了一套完美的解决方案，下面来看看Swagger2是如何来解决这个问题的。

1、新建项目sc-swagger2，对应的pom.xml文件

<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>spring-cloud</groupId>
    <artifactId>sc-swagger2</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>sc-swagger2</name>
    <url>http://maven.apache.org</url>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
    </parent>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

        </dependencies>
    </dependencyManagement>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.9.2</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
</project>

2、新建springboot启动类

package sc.swagger2;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Swagger2Application {
    
    public static void main(String[] args) {
        SpringApplication.run(Swagger2Application.class, args);
    }

}

3、新建Swagger2配置类

package sc.swagger2.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import springfox.documentation.builders.ApiInfoBuilder;
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;

@Configuration
@EnableSwagger2
public class Swagger2Config {

    @Bean
    public Docket createRestApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .select()
                .apis(RequestHandlerSelectors.basePackage("sc.swagger2"))
                .paths(PathSelectors.any())
                .build();
    }

    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("Spring Boot中使用Swagger2构建RESTful APIs")
                .description("更多Spring Boot相关文章请关注: JAVA乐园  公众号")
                .termsOfServiceUrl("https://edu.csdn.net/lecturer/995")
                .contact(new Contact("huangjinjin", //
                        "https://edu.csdn.net/lecturer/995",//
                        "happyhuangjinjin@sina.com"))
                .version("1.0")
                .build();
    }


}

4、新建一个模拟的Controller

package sc.swagger2.controller;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiResponse;
import io.swagger.annotations.ApiResponses;
import sc.swagger2.model.User;

@Api(value="用户管理")
@Controller
public class UserController {

    @ApiResponses({ @ApiResponse(code = 000000, message = "操作成功"),
        @ApiResponse(code = 000001, message = "服务器内部异常") })
    @GetMapping(value = "/feign/user/getUser/{id}")
    @ResponseBody
    @ApiOperation(value = "获取根据Id用户信息",response = User.class)
    @ApiImplicitParam(name = "id", value = "用户ID", required = true, dataType = "Long",example="100")
    public Map<String, Object> getUser(@PathVariable Long id) {
        Map<String, Object> result = new HashMap<String, Object>();
        result.put("code", "000000");
        result.put("msg", "success");
        User u = new User();
        u.setId(1L);
        u.setAge(23);
        u.setUserName("huangjinjin");
        u.setPosition("cto");
        result.put("body", u);
        return result;
    }

    @ApiResponses({ @ApiResponse(code = 000000, message = "操作成功"), 
        @ApiResponse(code = 000001, message = "服务器内部异常") })
    @RequestMapping(value = "/feign/user/listUser", method = RequestMethod.GET)
    @ResponseBody
    @ApiOperation(value = "获取用户列表")
    public Map<String, Object> listUser() {
        Map<String, Object> result = new HashMap<String, Object>();
        result.put("code", "000000");
        result.put("msg", "success");
        User u = new User();
        u.setId(1L);
        u.setAge(23);
        u.setUserName("huangjinjin");
        u.setPosition("cto");
        List<User> list = new ArrayList<User>();
        list.add(u);
        result.put("body", list);
        return result;
    }

    @ApiResponses({ @ApiResponse(code = 000000, message = "操作成功"), 
        @ApiResponse(code = 000001, message = "服务器内部异常") })
    @PostMapping(value = "/feign/user/addUser")
    @ResponseBody
    @ApiOperation(value = "添加用户", notes = "根据User对象创建用户")
    @ApiImplicitParams({ @ApiImplicitParam(name = "userName", value = "用户名", required = true, dataType = "String"),
        @ApiImplicitParam(name = "age", value = "年龄", required = true, dataType = "String"),
        @ApiImplicitParam(name = "position", value = "职位", required = true, dataType = "String"),
        @ApiImplicitParam(name = "id", value = "用户ID", required = false, dataType = "Long",example="100")})
    public Map<String, Object> addUser(User user) {
        Map<String, Object> result = new HashMap<String, Object>();
        result.put("code", "000000");
        result.put("msg", "success");
        result.put("body", 1);
        return result;
    }

    @ApiResponses({ @ApiResponse(code = 000000, message = "操作成功"), 
        @ApiResponse(code = 000001, message = "服务器内部异常") })
    @ApiOperation(value = "更新用户")
    @PutMapping(value = "/feign/user/updateUser")
    @ResponseBody
    @ApiImplicitParams({ @ApiImplicitParam(name = "userName", value = "用户名", required = true, dataType = "String"),
        @ApiImplicitParam(name = "age", value = "年龄", required = true, dataType = "String"),
        @ApiImplicitParam(name = "position", value = "职位", required = true, dataType = "String"),
        @ApiImplicitParam(name = "id", value = "用户ID", required = true, dataType = "Long", example="100")})
    public Map<String, Object> updateUser(User user) {
        Map<String, Object> result = new HashMap<String, Object>();
        result.put("code", "000000");
        result.put("msg", "success");
        result.put("body", 1);
        return result;
    }

    @ApiResponses({ @ApiResponse(code = 000000, message = "操作成功"), 
        @ApiResponse(code = 000001, message = "服务器内部异常") })
    @DeleteMapping(value = "/feign/user/deleteUser/{id}")
    @ResponseBody
    @ApiOperation(value = "删除用户")
    @ApiImplicitParam(name = "id", value = "用户ID", required = true, dataType = "Long",example="100")
    public Map<String, Object> deleteUser(@PathVariable Long id) {
        Map<String, Object> result = new HashMap<String, Object>();
        result.put("code", "000000");
        result.put("msg", "success");
        result.put("body", 1);
        return result;
    }
    
}

5、新建User模型类

package sc.swagger2.model;

import java.io.Serializable;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;

@ApiModel
public class User implements Serializable {

    private static final long serialVersionUID = 4639927446947303736L;

    @ApiModelProperty(name="id", dataType="Long", value="主键ID")
    private Long id;

    @ApiModelProperty(name="userName", dataType="String", value="姓名", required=true)
    private String userName;

    @ApiModelProperty(name="age", dataType="String", value="年龄", required=true)
    private Integer age;

    @ApiModelProperty(name="position", dataType="String", value="职位")
    private String position;

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getPosition() {
        return position;
    }

    public void setPosition(String position) {
        this.position = position;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

}

6、启动sc-swagger2项目，并验证是否启动成功

方式一：查看日志

16、springcloud整合Swagger2构建Restful服务的APIs