spring经常使用接口之BeanpostProccesser

springBean生命周期

做用：BeanPostProcessor在bean初始化先后作自定义处理

场景：须要自定义swagger,使全部请求显示固定的请求头参数(自定义Docket类)，可是swagger被架构组封装到sdk中，因此在BeanPostProcessor中对Docket的bean作处理

/**
 * 自定义swagger
 *
 * @author xiantao.wu
 * @create 2019/3/269:51
 **/
@Component
public class GiveAppBeanPostProcessor implements BeanPostProcessor {
    //bean初始化以前的操做
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        return bean;
    }

    //bean初始化以后的操做
    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        //swagger统一增长请求头
        if ("docket".equals(beanName)) {
            return builderHeader((Docket) bean);
        }
        return bean;
    }

    private Docket builderHeader(Docket docket) {
        List<Parameter> pars = new TreeList();
        pars.add(new ParameterBuilder().name("x-os-name").description("系统类型").defaultValue("iOS")
                .modelRef(new ModelRef("string")).parameterType("header").required(true).build());

        pars.add(new ParameterBuilder().name("x-os-version").description("系统版本").defaultValue("10.3.3")
                .modelRef(new ModelRef("string")).parameterType("header").required(true).build());

        return docket.globalOperationParameters(pars);
    }
}

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