Maven+SpringMVC+SpringFox+Swagger整合示例

查考链接：https://my.oschina.net/wangmengjun/blog/907679

coding地址：https://git.coding.net/conding_hjy/SpringMVC_SpringFox_Swagger.git

1、需求

　　在做项目的时候，有时候需要提供其它平台（如业务平台）相关的HTTP接口，业务平台则通过开放的HTTP接口获取相关的内容，并完成自身业务~
　　提供对外开放HTTP API接口，比较常用的是采用Spring MVC来完成。
　　本文的目标是先搭建一个简单的Spring MVC应用，然后为Spring MVC整合SpringFox-Swagger以及SpringFox-Swagger-UI，最终，达到Spring MVC对外开放接口API文档化。

如图所示：

2、实现步骤

2.1 搭建SpringMVC工程

　　2.1.1 新建Maven工程

　　

 　　

　　

2.1.2 引入Spring依赖包

完整的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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.xxx.tutorial</groupId>
    <artifactId>springfox-swagger-demo</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>springfox-swagger-demo Maven Webapp</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <spring.framework.version>4.3.6.RELEASE</spring.framework.version>
    </properties>

    <dependencies>
        <!--引入Spring依赖包 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.framework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.framework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.framework.version}</version>
        </dependency>
    </dependencies>
    
    <build>
        <finalName>springfox-swagger-demo</finalName>
    </build>
</project>

2.1.3 编写spring-mvc.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

    <!-- 默认的注解映射的支持 ,它会自动注册DefaultAnnotationHandlerMapping 与AnnotationMethodHandlerAdapter -->
    <mvc:annotation-driven />

    <!-- enable autowire 向容器自动注册 -->
    <context:annotation-config />

    <!-- 设置使用注解的类所在的jar包 -->
    <context:component-scan base-package="com.xxx.tutorial" />
    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />

</beans>

2.1.4 配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    id="WebApp_ID" metadata-complete="true" version="3.0">
    <display-name>Spring MVC</display-name>
    <servlet>
        <servlet-name>spring-mvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
        <async-supported>true</async-supported>
    </servlet>
    <servlet-mapping>
        <servlet-name>spring-mvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

2.1.5 编写Controller并测试

配置好spring-mvc.xml以及web.xml文件之后，咱们继续往下走~
因为，本文Spring MVC示例的作用主要用来暴露对外HTTP API接口，先写一个简单的ProductController，其包含一个按照id查询的方法。
Product.java和ProductController.java的内容如下：
Product.java

package com.xxx.tutorial.model;

import java.io.Serializable;

/**
 * 
 * @author wangmengjun
 *
 */
public class Product implements Serializable {

    private static final long serialVersionUID = 1L;

    /**ID*/
    private Long id;

    /**产品名称*/
    private String name;

    /**产品型号*/
    private String productClass;

    /**产品ID*/
    private String productId;

    /**
     * @return the id
     */
    public Long getId() {
        return id;
    }

    /**
     * @param id
     *            the id to set
     */
    public void setId(Long id) {
        this.id = id;
    }

    /**
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * @param name
     *            the name to set
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * @return the productClass
     */
    public String getProductClass() {
        return productClass;
    }

    /**
     * @param productClass
     *            the productClass to set
     */
    public void setProductClass(String productClass) {
        this.productClass = productClass;
    }

    /**
     * @return the productId
     */
    public String getProductId() {
        return productId;
    }

    /**
     * @param productId
     *            the productId to set
     */
    public void setProductId(String productId) {
        this.productId = productId;
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        return "Product [id=" + id + ", name=" + name + ", productClass=" + productClass + ", productId=" + productId
                + "]";
    }

}

ProductController.java

package com.xxx.tutorial.controller;

import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.xxx.tutorial.model.Product;

@RestController
@RequestMapping(value = { "/api/product/"})
public class ProductController {

    @RequestMapping(value = "/{id}", method = RequestMethod.GET)
    public ResponseEntity<Product> get(@PathVariable Long id) {
        Product product = new Product();
        product.setName("七级滤芯净水器");
        product.setId(1L);
        product.setProductClass("seven_filters");
        product.setProductId("T12345");
        return ResponseEntity.ok(product);
    }
}

注：鉴于是一个demo示例，所以没有写ProductService以及相关DAO, 直接在方法中返回固定的Product信息~

2.1.6 验证Spring MVC是否ok

完成Controller的代码，运行Spring MVC项目，然后，看一下Spring MVC是否运行ok，访问URL地址
http://localhost:8080/Springfox-swagger-demo/api/product/1

出现错误

解决方法，添加jackson-databind依赖包即可~

<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.6.6</version>
</dependency>

重新启动，运行一下，成功返回信息~

2.2 整合SpringFox-Swagger

在SpringMVC项目中整合SpringFox-Swagger只要如下几步即可~

• 添加SpringFox-Swagger依赖
• 添加SwaggerConfig

添加依赖

<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.7.0</version>
</dependency>

添加SwaggerConfig

package com.xxx.tutorial.config;

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

import springfox.documentation.builders.ApiInfoBuilder;
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
public class SwaggerConfig {

@Bean
public Docket api() {
return new Docket(DocumentationType.SWAGGER_2)
.select()
.apis(RequestHandlerSelectors.any())
.build()
.apiInfo(apiInfo());
}

private ApiInfo apiInfo() {
return new ApiInfoBuilder()
.title("对外开放接口API 文档")
.description("HTTP对外开放接口")
.version("1.0.0")
.termsOfServiceUrl("http://xxx.xxx.com")
.license("LICENSE")
.licenseUrl("http://xxx.xxx.com")
.build();
}

}

2.3 整合SpringFox-Swagger-UI

在SpringMVC项目中整合SpringFox-Swagger-UI也只要如下两个步骤即可~

• 添加SpringFox-Swagger-UI依赖
• 添加配置

 添加依赖

<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
    <version>2.7.0</version>
</dependency>

添加配置

在添加配置之前，一起来看一下swagger-ui中使用的静态资源文件（如 swagger-ui.html ）放在那里~
spingfox-swagger-ui-2.7.0.jar中的/META-INF/resources/下~ 如下图所示：

为了访问swagger-ui.html，我们配置对这些静态资源的访问~ 如：

package com.xxx.tutorial.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.WebMvcConfigurerAdapter;

@Configuration
@EnableWebMvc
public class WebAppConfig extends WebMvcConfigurerAdapter {

　　@Override 
　　public void addResourceHandlers(ResourceHandlerRegistry registry) {
　　　　registry.addResourceHandler("swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/");
　　　　registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
　　}
}

该配置代码的效果和如下代码等价~

<mvc:resources mapping="swagger-ui.html" location="classpath:/META-INF/resources/" />
<mvc:resources mapping="/webjars/**"
location="classpath:/META-INF/resources/webjars/" />

在本文中，可以将其配置在spring-mvc.xml中，

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

<!-- 默认的注解映射的支持 ,它会自动注册DefaultAnnotationHandlerMapping 与AnnotationMethodHandlerAdapter -->
<mvc:annotation-driven />

<!-- enable autowire 向容器自动注册 -->
<context:annotation-config />

<!-- 设置使用注解的类所在的jar包 -->
<context:component-scan base-package="com.xxx.tutorial" />

<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />

<mvc:resources mapping="swagger-ui.html" location="classpath:/META-INF/resources/" />
<mvc:resources mapping="/webjars/**"
location="classpath:/META-INF/resources/webjars/" />
</beans>

API接口说明代码添加并测试
经过上述几个步骤之后，之前写的ProductController的接口，就可以实现文档化了，如本文通过如下的访问地址访问：
http://localhost:8080/Springfox-swagger-demo/swagger-ui.html

这个接口API雏形出来了，但是还缺少点东西，比如：接口方法的描述等都没有~
修改一下，ProductController.java内容，如：

package com.xxx.tutorial.controller;

import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.xxx.tutorial.model.Product;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;

@RestController
@RequestMapping(value = { "/api/product/" })
@Api(value = "/product", tags = "Product接口")
public class ProductController {

    @RequestMapping(value = "/{id}", method = RequestMethod.GET)
    @ApiOperation(value = "根据id获取产品信息", notes = "根据id获取产品信息", httpMethod = "GET", response = Product.class)
    public ResponseEntity<Product> get(@PathVariable Long id) {
        Product product = new Product();
        product.setName("七级滤芯净水器");
        product.setId(1L);
        product.setProductClass("seven_filters");
        product.setProductId("T12345");
        return ResponseEntity.ok(product);
    }
}

重新访问，接口已经出现多个我们指定的描述信息~

在参数id栏中输入1，然后点击“try it out”按钮~ 可以查看接口调用结果~

至此一个简单的示例就完成了~

稍微增加几个接口

修改ProductController

package com.xxx.tutorial.controller;

import java.util.Arrays;
import java.util.List;

import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.xxx.tutorial.model.Product;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiResponse;
import io.swagger.annotations.ApiResponses;

@RestController
@RequestMapping(value = { "/api/product/" })
@Api(value = "/product", tags = "Product接口")
public class ProductController {

@RequestMapping(value = "/{id}", method = RequestMethod.GET)
@ApiOperation(value = "根据id获取产品信息", notes = "根据id获取产品信息", httpMethod = "GET", response = Product.class)
public ResponseEntity<Product> get(@PathVariable Long id) {
Product product = new Product();
product.setName("七级滤芯净水器");
product.setId(1L);
product.setProductClass("seven_filters");
product.setProductId("T12345");
return ResponseEntity.ok(product);
}

@RequestMapping(method = RequestMethod.POST)
@ApiOperation(value = "添加一个新的产品")
@ApiResponses(value = { @ApiResponse(code = 405, message = "参数错误") })
public ResponseEntity<String> add(Product product) {
return ResponseEntity.ok("SUCCESS");
}

@RequestMapping(method = RequestMethod.PUT)
@ApiOperation(value = "更新一个产品")
@ApiResponses(value = { @ApiResponse(code = 400, message = "参数错误") })
public ResponseEntity<String> update(Product product) {
return ResponseEntity.ok("SUCCESS");
}

@RequestMapping(method = RequestMethod.GET)
@ApiOperation(value = "获取所有产品信息", notes = "获取所有产品信息", httpMethod = "GET", response = Product.class, responseContainer = "List")
public ResponseEntity<List<Product>> getAllProducts() {
Product product = new Product();
product.setName("七级滤芯净水器");
product.setId(1L);
product.setProductClass("seven_filters");
product.setProductId("T12345");
return ResponseEntity.ok(Arrays.asList(product, product));
}
}

swagger-ui展示

由上图可以看出，不同的method（GET / PUT / POST等）都会以不同的颜色展示出来~
Swagger-ui的添加，可以帮助他人查看接口信息，并在页面上进行输入参数来调用接口~

Maven工程的目录如下：

本文只是一个简单的整合示例，大家只要操作一下就能出来结果。
更加详细的文档，有兴趣的小伙伴可以访问swagger-ui的官网查看~