SpringCloud gateway怎么修改返回数据

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SpringCloud gateway 修改返回数据

版本说明

gradle

主要引入了springboot 2.1,lombok

plugins {    id 'org.springframework.boot' version '2.1.6.RELEASE'    id 'java'    id "io.freefair.lombok" version "3.6.6"}apply plugin: 'io.spring.dependency-management'group = 'cn.buddie.demo'version = '0.0.1-SNAPSHOT'sourceCompatibility = '11'repositories {    mavenCentral()}ext {    set('springCloudVersion', "Greenwich.SR2")}dependencies {    implementation 'org.springframework.cloud:spring-cloud-starter-gateway'    compile 'org.projectlombok:lombok:1.18.8'    testImplementation 'org.springframework.boot:spring-boot-starter-test'}dependencyManagement {    imports {        mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"    }}

yaml

定义路由及过滤器 test-route路由，当Path为/users时，转到uri中配置的链接http://127.0.0.1:8123/users中。使用UnionResult来过滤

spring:  cloud:    gateway:      enabled: true      routes:      - id: test-route        uri: http://127.0.0.1:8123/users        predicates:        - Path=/users        filters:        - UnionResult

filter

yaml中配置的filter名字，加"GatewayFilterFactory",就是对应的过滤器Java类

package cn.buddie.demo.springcloudgateway.filter;import cn.buddie.demo.springcloudgateway.model.UnionResult;import org.springframework.cloud.gateway.filter.GatewayFilter;import org.springframework.cloud.gateway.filter.factory.rewrite.ModifyResponseBodyGatewayFilterFactory;import org.springframework.cloud.gateway.filter.factory.rewrite.RewriteFunction;import org.springframework.stereotype.Component;import reactor.core.publisher.Mono;/** * description * * @author buddie.wei * @date 2019/7/20 */@Componentpublic class UnionResultGatewayFilterFactory extends ModifyResponseBodyGatewayFilterFactory {    @Override    public GatewayFilter apply(Config config) {        return new ModifyResponseGatewayFilter(this.getConfig());    }    private Config getConfig() {        Config cf = new Config();        // Config.setRewriteFunction(Class inClass, Class outClass, RewriteFunction rewriteFunction)        // inClass 原数据类型，可以指定为具体数据类型，我这里指定为Object,是为了处理多种数据类型。        //                      当然支持多接口返回多数据类型的统一修改，yaml中的配置，path,uri需要做相关调整        // outClass 目标数据类型        // rewriteFunction 内容重写方法        cf.setRewriteFunction(Object.class, UnionResult.class, getRewriteFunction());        return cf;    }    private RewriteFunction getRewriteFunction() {        return (exchange, resp) -> Mono.just(UnionResult.builder().requestId(exchange.getRequest().getHeaders().getFirst("cn-buddie.demo.requestId")).result(resp).build());    }}

model

package cn.buddie.demo.springcloudgateway.model;import lombok.Builder;import lombok.Getter;import lombok.Setter;/** * description * * @author buddie.wei * @date 2019/7/20 */@Getter@Setter@Builderpublic class UnionResult {    private String requestId;    private Object result;}

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