spring cloud gateway 修改response 截断问题，乱码问题解决

朱雀 2024-04-17 05:40 32阅读 0赞

**              [Spring cloud gateway 处理跨域问题][Spring cloud gateway]**

**[Spring cloud gateway 设置https 和http同时支持][Spring cloud gateway _https _http]**

**              [Spring cloud gateway 拦截请求404 等HTTP 状态码][Spring cloud gateway _404 _HTTP]**

**              [Spring cloud gateway 详解和配置使用（文章较长）][Spring cloud gateway 1] **

**              [Spring cloud Gateway 指定执行过滤器 （在配置文件中配置所需要过滤器）][Spring cloud Gateway _]**

乱码问题其实就是返回数据gateway 进行了截断所产生的，所以我们需要把返回的组进行join上就不会产生乱码的，如果还是乱码，请根据自己系统的实际编码进行转换即可，完美解决，

### 请注意：这篇文章不同于以往文章这里使用的是 DefaultDataBufferFactory 的join方法去合并多个dataBuffers ↓↓↓↓↓↓↓↓↓↓↓↓↓↓ 最大的区别 ###

DataBufferFactory dataBufferFactory = new DefaultDataBufferFactory();
      DataBuffer join = dataBufferFactory.join(dataBuffers);
      byte[] content = new byte[join.readableByteCount()];
      join.read(content);
      DataBufferUtils.release(join);
      String responseData = new String(content, StandardCharsets.UTF_8);

下面是详细代码

import com.google.common.base.Charsets;
    import lombok.extern.slf4j.Slf4j;
    import org.reactivestreams.Publisher;
    import org.springframework.cloud.gateway.filter.GatewayFilterChain;
    import org.springframework.cloud.gateway.filter.GlobalFilter;
    import org.springframework.core.Ordered;
    import org.springframework.core.io.buffer.DataBuffer;
    import org.springframework.core.io.buffer.DataBufferFactory;
    import org.springframework.core.io.buffer.DataBufferUtils;
    import org.springframework.core.io.buffer.DefaultDataBufferFactory;
    import org.springframework.http.HttpStatus;
    import org.springframework.http.server.reactive.ServerHttpResponse;
    import org.springframework.http.server.reactive.ServerHttpResponseDecorator;
    import org.springframework.stereotype.Component;
    import org.springframework.web.server.ServerWebExchange;
    import reactor.core.publisher.Flux;
    import reactor.core.publisher.Mono;
    
    @Component
    @Slf4j
    public class DangDeleDangDangYiDangDangFilter implements GlobalFilter, Ordered {
        @Override
        public int getOrder() {
            //-1 is response write filter, must be called before that
            return -2;
        }
    
        @Override
        public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
            try {
                //获取response的 返回数据
                ServerHttpResponse originalResponse = exchange.getResponse();
                DataBufferFactory bufferFactory = originalResponse.bufferFactory();
                HttpStatus statusCode = originalResponse.getStatusCode();
    
                if (statusCode == HttpStatus.OK) {
                    ServerHttpResponseDecorator decoratedResponse = new ServerHttpResponseDecorator(originalResponse) {
                        @Override
                        public Mono<Void> writeWith(Publisher<? extends DataBuffer> body) {
                        // 判断服务返回的数据类型进行拦截，根据自己的业务进行修改
                            if (APPLICATION_JSON.isCompatibleWith(getDelegate().getHeaders().getContentType())) {
                                Flux<? extends DataBuffer> fluxBody = Flux.from(body);
                                return super.writeWith(fluxBody.buffer().map(dataBuffers -> {
                                    DataBufferFactory dataBufferFactory = new DefaultDataBufferFactory();
                                    DataBuffer join = dataBufferFactory.join(dataBuffers);
                                    byte[] content = new byte[join.readableByteCount()];
                                    join.read(content);
                                    DataBufferUtils.release(join);
                                    String responseData = new String(content, Charsets.UTF_8);
                                    if (log.isDebugEnabled()) {
                                        log.debug("响应转前:{}", responseData);
                                    }
                                    responseData = responseData.replaceAll(":null", ":\"\"");
                                    if (log.isDebugEnabled()) {
                                        log.debug("响应转后:{}", responseData);
                                    }
                                    byte[] uppedContent = responseData.getBytes(Charsets.UTF_8);
                                     
                                    return bufferFactory.wrap(uppedContent);
                                }));
                            } else {
                                return chain.filter(exchange);
                            }
                        }
                    };
                    return chain.filter(exchange.mutate().response(decoratedResponse).build());
                }
                return chain.filter(exchange);
            } catch (Exception e) {
                log.error(" ReplaceNullFilter 异常", e);
                return chain.filter(exchange);
            }
        }
    }

![2019082310341929.png][]

完美解决了

[Spring cloud gateway]: https://blog.csdn.net/qq_38380025/article/details/104936705
[Spring cloud gateway _https _http]: https://blog.csdn.net/qq_38380025/article/details/106255171
[Spring cloud gateway _404 _HTTP]: https://blog.csdn.net/qq_38380025/article/details/104755040
[Spring cloud gateway 1]: https://blog.csdn.net/qq_38380025/article/details/102968559
[Spring cloud Gateway _]: https://blog.csdn.net/qq_38380025/article/details/104894916
[2019082310341929.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/11/d564bf5cf03042788a8c90654b5dea31.png