如何使用maven-swagger-codegen-plugin生成文档？

<build>
    <plugins>
        <plugin>
            <groupId>io.swagger</groupId>
            <artifactId>swagger-codegen-maven-plugin</artifactId>
            <version>2.4.17</version>
            <executions>
                <execution>
                    <goals>
                        <goal>generate</goal>
                    </goals>
                    <configuration>
                        <inputSpec>path/to/swagger.json</inputSpec>
                        <language>html2</language>
                        <output>${project.build.directory}/generated-docs</output>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

mvn swagger-codegen:generate