SpringBoot整合Swagger2「建议收藏」

大家好，又见面了，我是你们的朋友全栈君。

手写Api文档的几个痛点：

文档需要更新的时候，需要再次发送一份给前端，也就是文档更新交流不及时。
接口返回结果不明确
不能直接在线测试接口，通常需要使用工具，比如postman
接口文档太多，不好管理

Swagger也就是为了解决这个问题，当然也不能说Swagger就一定是完美的，当然也有缺点，最明显的就是代码移入性比较强。

一、依赖

<dependency>
	<groupId>io.springfox</groupId>
	<artifactId>springfox-swagger2</artifactId>
	<version>2.6.1</version>
</dependency>

<dependency>
	<groupId>io.springfox</groupId>
	<artifactId>springfox-swagger-ui</artifactId>
	<version>2.6.1</version>
</dependency>

二、Swagger配置类
其实这个配置类，只要了解具体能配置哪些东西就好了，毕竟这个东西配置一次之后就不用再动了。特别要注意的是里面配置了api文件也就是controller包的路径，不然生成的文档扫描不到接口。

package cn.saytime;

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.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;

/**
 * @author zh
 * @ClassName cn.saytime.Swgger2
 * @Description
 * @date 2017-07-10 22:12:31
 */
@Configuration
public class Swagger2 {

	@Bean
	public Docket createRestApi() {
		return new Docket(DocumentationType.SWAGGER_2)
				.apiInfo(apiInfo())
				.select()
				.apis(RequestHandlerSelectors.basePackage("cn.saytime.web"))
				.paths(PathSelectors.any())
				.build();
	}
	
	private ApiInfo apiInfo() {
		return new ApiInfoBuilder()
				.title("springboot利用swagger构建api文档")
				.description("简单优雅的restfun风格，http://blog.csdn.net/saytime")
				.termsOfServiceUrl("http://blog.csdn.net/saytime")
				.version("1.0")
				.build();
	}
}

Application.class 加上注解@EnableSwagger2 表示开启Swagger
Ps：用@Configuration注解该类，等价于XML中配置beans；用@Bean标注方法等价于XML中配置bean。

package cn.saytime;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@SpringBootApplication
@EnableSwagger2
public class SpringbootSwagger2Application {

	public static void main(String[] args) {
		SpringApplication.run(SpringbootSwagger2Application.class, args);
	}
}

三、Restful 接口

package cn.saytime.web;

import cn.saytime.bean.JsonResult;
import cn.saytime.bean.User;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import springfox.documentation.annotations.ApiIgnore;

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

/**
 * @author zh
 * @ClassName cn.saytime.web.UserController
 * @Description
 */
@RestController
public class UserController {

	// 创建线程安全的Map
	static Map<Integer, User> users = Collections.synchronizedMap(new HashMap<Integer, User>());

	/**
	 * 根据ID查询用户
	 * @param id
	 * @return
	 */
	@ApiOperation(value="获取用户详细信息", notes="根据url的id来获取用户详细信息")
	@ApiImplicitParam(name = "id", value = "用户ID", required = true, dataType = "Integer", paramType = "path")
	@RequestMapping(value = "user/{id}", method = RequestMethod.GET)
	public ResponseEntity<JsonResult> getUserById (@PathVariable(value = "id") Integer id){
		JsonResult r = new JsonResult();
		try {
			User user = users.get(id);
			r.setResult(user);
			r.setStatus("ok");
		} catch (Exception e) {
			r.setResult(e.getClass().getName() + ":" + e.getMessage());
			r.setStatus("error");
			e.printStackTrace();
		}
		return ResponseEntity.ok(r);
	}

	/**
	 * 查询用户列表
	 * @return
	 */
	@ApiOperation(value="获取用户列表", notes="获取用户列表")
	@RequestMapping(value = "users", method = RequestMethod.GET)
	public ResponseEntity<JsonResult> getUserList (){
		JsonResult r = new JsonResult();
		try {
			List<User> userList = new ArrayList<User>(users.values());
			r.setResult(userList);
			r.setStatus("ok");
		} catch (Exception e) {
			r.setResult(e.getClass().getName() + ":" + e.getMessage());
			r.setStatus("error");
			e.printStackTrace();
		}
		return ResponseEntity.ok(r);
	}

	/**
	 * 添加用户
	 * @param user
	 * @return
	 */
	@ApiOperation(value="创建用户", notes="根据User对象创建用户")
	@ApiImplicitParam(name = "user", value = "用户详细实体user", required = true, dataType = "User")
	@RequestMapping(value = "user", method = RequestMethod.POST)
	public ResponseEntity<JsonResult> add (@RequestBody User user){
		JsonResult r = new JsonResult();
		try {
			users.put(user.getId(), user);
			r.setResult(user.getId());
			r.setStatus("ok");
		} catch (Exception e) {
			r.setResult(e.getClass().getName() + ":" + e.getMessage());
			r.setStatus("error");

			e.printStackTrace();
		}
		return ResponseEntity.ok(r);
	}

	/**
	 * 根据id删除用户
	 * @param id
	 * @return
	 */
	@ApiOperation(value="删除用户", notes="根据url的id来指定删除用户")
	@ApiImplicitParam(name = "id", value = "用户ID", required = true, dataType = "Long", paramType = "path")
	@RequestMapping(value = "user/{id}", method = RequestMethod.DELETE)
	public ResponseEntity<JsonResult> delete (@PathVariable(value = "id") Integer id){
		JsonResult r = new JsonResult();
		try {
			users.remove(id);
			r.setResult(id);
			r.setStatus("ok");
		} catch (Exception e) {
			r.setResult(e.getClass().getName() + ":" + e.getMessage());
			r.setStatus("error");

			e.printStackTrace();
		}
		return ResponseEntity.ok(r);
	}

	/**
	 * 根据id修改用户信息
	 * @param user
	 * @return
	 */
	@ApiOperation(value="更新信息", notes="根据url的id来指定更新用户信息")
	@ApiImplicitParams({
			@ApiImplicitParam(name = "id", value = "用户ID", required = true, dataType = "Long",paramType = "path"),
			@ApiImplicitParam(name = "user", value = "用户实体user", required = true, dataType = "User")
	})
	@RequestMapping(value = "user/{id}", method = RequestMethod.PUT)
	public ResponseEntity<JsonResult> update (@PathVariable("id") Integer id, @RequestBody User user){
		JsonResult r = new JsonResult();
		try {
			User u = users.get(id);
			u.setUsername(user.getUsername());
			u.setAge(user.getAge());
			users.put(id, u);
			r.setResult(u);
			r.setStatus("ok");
		} catch (Exception e) {
			r.setResult(e.getClass().getName() + ":" + e.getMessage());
			r.setStatus("error");

			e.printStackTrace();
		}
		return ResponseEntity.ok(r);
	}

	@ApiIgnore//使用该注解忽略这个API
	@RequestMapping(value = "/hi", method = RequestMethod.GET)
	public String  jsonTest() {
		return " hi you!";
	}
}

Json格式输出类 JsonResult.class

package cn.saytime.bean;

public class JsonResult {

	private String status = null;

	private Object result = null;

	// Getter Setter
}

实体User.class

package cn.saytime.bean;

import java.util.Date;

/**
 * @author zh
 * @ClassName cn.saytime.bean.User
 * @Description
 */
public class User {

	private int id;
	private String username;
	private int age;
	private Date ctm;

	// Getter Setter
}

四、Swagger2文档
动SpringBoot项目，访问 http://localhost:8080/swagger-ui.html

五、Swagger注解
swagger通过注解表明该接口会生成文档，包括接口名、请求方法、参数、返回信息的等等。

@Api：修饰整个类，描述Controller的作用
@ApiOperation：描述一个类的一个方法，或者说一个接口
@ApiParam：单个参数描述
@ApiModel：用对象来接收参数
@ApiProperty：用对象接收参数时，描述对象的一个字段
@ApiResponse：HTTP响应其中1个描述
@ApiResponses：HTTP响应整体描述
@ApiIgnore：使用该注解忽略这个API
@ApiError ：发生错误返回的信息
@ApiImplicitParam：一个请求参数
@ApiImplicitParams：多个请求参数

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