Swagger2配置(解决404报错)

在spring boot项目中配置Swagger2，配置好了但是访问确实404，SwaggerConfig中的注入方法也执行了还是访问不到页面。究其原因是MVC没有找到swagger-ui包中的swagger-ui.html文件。

Swagger2的配置步骤如下：

一、引入依赖

pom.wml

<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>

二、编写配置文件

package io.github.talelin.latticy.config;

import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import springfox.documentation.RequestHandler;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
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 {

    // 定义分隔符
    private static final String splitor = ";";

    @Bean
    Docket docket() {
        System.out.println("Swagger===========================================");

        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .select()
                .apis(basePackage("io.github.talelin.latticy.controller.v1"))			//这里采用包扫描的方式来确定要显示的接口
                // .apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))                         //这里采用包含注解的方式来确定要显示的接口
                .paths(PathSelectors.any())
                .build();
    }

    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("CMS")
                .description("电商小程序 CMS Api文档")
                .termsOfServiceUrl("https://blog.csdn.net/xfx_1994")
                .version("1.0")
                .build();
    }

    public static Predicate <RequestHandler> basePackage(final String basePackage) {
        return input -> declaringClass(input).transform(handlerPackage(basePackage)).or(true);
    }

    private static Function <Class<?>, Boolean> handlerPackage(final String basePackage)     {
        return input -> {
            // 循环判断匹配
            for (String strPackage : basePackage.split(splitor)) {
                boolean isMatch = input.getPackage().getName().startsWith(strPackage);
                if (isMatch) {
                    return true;
                }
            }
            return false;
        };
    }

    private static Optional<? extends Class<?>> declaringClass(RequestHandler input) {
        return Optional.fromNullable(input.declaringClass());
    }

}

至此已经配置完成，启动项目访问 http://localhost: ${port}/${context-path}/swagger-ui.html
如果访问成功则不需要继续下面的配置，如果访问失败出现404报错，则进行下面的配置

三、解决404报错

package io.github.talelin.latticy.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

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

原理就是帮助MVC找到 swagger-ui.html 及其 CSS,JS 对应的文件;