写在最前：当微服务中swagger升级到3.0之后，在整合knife4j时使用2.0的整合方式就打不开页面了，这里提供详细swagger3.0整合knife4j的方式
注：swagger3.0需要使用新的knife4j依赖
<dependency>
<groupId>com.github.xiaoymin</groupId>
<artifactId>knife4j-springdoc-ui</artifactId>
<version>3.0.3</version>
</dependency>
添加过滤器之前
过滤器代码
package com.wlj.clouddemo.gateway.filter;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
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.DataBufferUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
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;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
/**
* swagger v3/api-docs缺失basePath 过滤器
*
* @Author 955
* @Date 2022-09-22 11:31
* @Description
*/
@Slf4j
@Component
public class SwaggerGlobalFilter implements GlobalFilter, Ordered {
public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
ServerHttpRequest request = exchange.getRequest();
String path = request.getPath().toString();
String host = request.getLocalAddress().getHostString();
int port = request.getLocalAddress().getPort();
if (!path.endsWith("/v3/api-docs")) {
return chain.filter(exchange);
}
String[] pathArray = path.split("/");
System.out.println(pathArray);
String basePath = pathArray[1];
ServerHttpResponse originalResponse = exchange.getResponse();
// 定义新的消息头
ServerHttpResponseDecorator decoratedResponse = new ServerHttpResponseDecorator(originalResponse) {
@Override
public Mono<Void> writeWith(Publisher<? extends DataBuffer> body) {
if (super.getStatusCode().equals(HttpStatus.OK) && body instanceof Flux) {
Flux<? extends DataBuffer> fluxBody = Flux.from(body);
return super.writeWith(fluxBody.buffer().map(dataBuffers -> {
List<String> list = new ArrayList<>();
dataBuffers.forEach(dataBuffer -> {
byte[] content = new byte[dataBuffer.readableByteCount()];
dataBuffer.read(content);
DataBufferUtils.release(dataBuffer);
list.add(new String(content, Charset.forName("UTF-8")));
});
String s = this.listToString(list);
JSONObject jsonObject = JSON.parseObject(s);
jsonObject.put("host", host + ":" + port);
jsonObject.put("basePath", basePath);
s = jsonObject.toString();
// 设置更新后的header请求头长度
int length = s.getBytes().length;
HttpHeaders headers = originalResponse.getHeaders();
headers.setContentLength(length);
return bufferFactory().wrap(s.getBytes(Charset.forName("UTF-8")));
}));
}
return super.writeWith(body);
}
@Override
public HttpHeaders getHeaders() {
// 获取父类原始ServerHttpResponse的header请求头信息，这是代理Delegate类型
HttpHeaders httpHeaders = super.getHeaders();
httpHeaders.set(HttpHeaders.CONTENT_TYPE, "application/json;charset=UTF-8");
return httpHeaders;
}
private String listToString(List<String> list) {
StringBuilder stringBuilder = new StringBuilder();
for (String s : list) {
stringBuilder.append(s);
}
return stringBuilder.toString();
}
};
// replace response with decorator
return chain.filter(exchange.mutate().response(decoratedResponse).build());
}
@Override
public int getOrder() {
return -2;
}
}
添加过滤器之后
