spring cloud gateway中如何读取请求参数
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spring cloud gateway读取请求参数
1. 我的版本：
- spring-cloud：Hoxton.RELEASE
- spring-boot：2.2.2.RELEASE
- spring-cloud-starter-gateway
2. 请求日志
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.http.HttpMethod;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpRequestDecorator;
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.StandardCharsets;
import java.util.Map;
import java.util.stream.Collectors;
@Slf4j
@Component
public class LoggerFilter implements GlobalFilter {
@Override
public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
ServerHttpRequest request = exchange.getRequest();
String method = request.getMethodValue();
if (HttpMethod.POST.matches(method)) {
return DataBufferUtils.join(exchange.getRequest().getBody())
.flatMap(dataBuffer -> {
byte[] bytes = new byte[dataBuffer.readableByteCount()];
dataBuffer.read(bytes);
String bodyString = new String(bytes, StandardCharsets.UTF_8);
logtrace(exchange, bodyString);
exchange.getAttributes().put("POST_BODY", bodyString);
DataBufferUtils.release(dataBuffer);
Flux<DataBuffer> cachedFlux = Flux.defer(() -> {
DataBuffer buffer = exchange.getResponse().bufferFactory()
.wrap(bytes);
return Mono.just(buffer);
});
ServerHttpRequest mutatedRequest = new ServerHttpRequestDecorator(
exchange.getRequest()) {
@Override
public Flux<DataBuffer> getBody() {
return cachedFlux;
}
};
return chain.filter(exchange.mutate().request(mutatedRequest)
.build());
});
} else if (HttpMethod.GET.matches(method)) {
Map m = request.getQueryParams();
logtrace(exchange, m.toString());
}
return chain.filter(exchange);
}
private void logtrace(ServerWebExchange exchange, String param) {
ServerHttpRequest serverHttpRequest = exchange.getRequest();
String path = serverHttpRequest.getURI().getPath();
String method = serverHttpRequest.getMethodValue();
String headers = serverHttpRequest.getHeaders().entrySet()
.stream()
.map(entry -> " " + entry.getKey() + ": [" + String.join(";", entry.getValue()) + "]")
.collect(Collectors.joining("\n"));
log.info("\n" + "---------------- ---------------- ---------------->>\n" +
"HttpMethod : {}\n" +
"Uri : {}\n" +
"Param : {}\n" +
"Headers : \n" +
"{}\n" +
"\"<<---------------- ---------------- ----------------"
, method, path, param, headers);
}
}3. 测试输出，我这边测试没有问题，日志正常输出
gateway网关转发请求添加参数
在继承AbstractGatewayFilterFactory的过滤器中
GET请求添加参数
// 参考api文档中GatewapFilter中“添加请求参数拦截器”：AddRequestParameterGatewayFilterFactory.java
//记录日志
//logger.info("全局参数处理: {} url：{} 参数：{}",method.toString(),serverHttpRequest.getURI().getRawPath(),newRequestQueryParams.toString());
// 获取原参数
URI uri = serverHttpRequest.getURI();
StringBuilder query = new StringBuilder();
String originalQuery = uri.getRawQuery();
if (org.springframework.util.StringUtils.hasText(originalQuery)) {
query.append(originalQuery);
if (originalQuery.charAt(originalQuery.length() - 1) != '&') {
query.append('&');
}
}
// 添加查询参数
query.append(ServiceConstants.COMMON_PARAMETER_ENTERPRISEID+"="+authenticationVO.getEnterpriseId()
+"&"+ServiceConstants.COMMON_PARAMETER_USERID+"="+authenticationVO.getUserId());
// 替换查询参数
URI newUri = UriComponentsBuilder.fromUri(uri)
.replaceQuery(query.toString())
.build(true)
.toUri();
ServerHttpRequest request = exchange.getRequest().mutate().uri(newUri).build();
return chain.filter(exchange.mutate().request(request).build());
POST请求添加参数
//从请求里获取Post请求体
String bodyStr = resolveBodyFromRequest(serverHttpRequest);
String userId = "123";
// 这种处理方式，必须保证post请求时，原始post表单必须有数据过来，不然会报错
if (StringUtils.isEmpty(bodyStr)) {
logger.error("请求异常：{} POST请求必须传递参数", serverHttpRequest.getURI().getRawPath());
ServerHttpResponse response = exchange.getResponse();
response.setStatusCode(HttpStatus.BAD_REQUEST);
return response.setComplete();
}
//application/x-www-form-urlencoded和application/json才添加参数
//其他上传文件之类的，不做参数处理，因为文件流添加参数，文件原格式就会出问题了
// 新增body参数
if (MediaType.APPLICATION_JSON_VALUE.equalsIgnoreCase(contentType)) {
JSONObject jsonObject = new JSONObject(bodyStr);
jsonObject.put("userId", userId);
bodyStr = jsonObject.toString();
}
//记录日志
logger.info("全局参数处理: {} url：{} 参数：{}", method.toString(), serverHttpRequest.getURI().getRawPath(), bodyStr);
//下面的将请求体再次封装写回到request里，传到下一级，否则，由于请求体已被消费，后续的服务将取不到值
URI uri = serverHttpRequest.getURI();
URI newUri = UriComponentsBuilder.fromUri(uri).build(true).toUri();
ServerHttpRequest request = exchange.getRequest().mutate().uri(newUri).build();
DataBuffer bodyDataBuffer = stringBuffer(bodyStr);
Flux<DataBuffer> bodyFlux = Flux.just(bodyDataBuffer);
// 定义新的消息头
HttpHeaders headers = new HttpHeaders();
headers.putAll(exchange.getRequest().getHeaders());
// 添加消息头
// headers.set(ServiceConstants.SHIRO_SESSION_PRINCIPALS,GsonUtils.toJson(authenticationVO));
// 由于修改了传递参数，需要重新设置CONTENT_LENGTH，长度是字节长度，不是字符串长度
int length = bodyStr.getBytes().length;
headers.remove(HttpHeaders.CONTENT_LENGTH);
headers.setContentLength(length);
// 设置CONTENT_TYPE
if (StringUtils.isEmpty(contentType)) {
headers.set(HttpHeaders.CONTENT_TYPE, contentType);
}
// 由于post的body只能订阅一次，由于上面代码中已经订阅过一次body。所以要再次封装请求到request才行，不然会报错请求已经订阅过
request = new ServerHttpRequestDecorator(request) {
@Override
public HttpHeaders getHeaders() {
long contentLength = headers.getContentLength();
HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.putAll(super.getHeaders());
if (contentLength > 0) {
httpHeaders.setContentLength(contentLength);
} else {
// TODO: this causes a 'HTTP/1.1 411 Length Required' on httpbin.org
httpHeaders.set(HttpHeaders.TRANSFER_ENCODING, "chunked");
}
return httpHeaders;
}
@Override
public Flux<DataBuffer> getBody() {
return bodyFlux;
}
};
//封装request，传给下一级
request.mutate().header(HttpHeaders.CONTENT_LENGTH, Integer.toString(bodyStr.length()));
return chain.filter(exchange.mutate().request(request).build());
private String resolveBodyFromRequest(ServerHttpRequest serverHttpRequest) {
//获取请求体
Flux<DataBuffer> body = serverHttpRequest.getBody();
AtomicReference<String> bodyRef = new AtomicReference<>();
body.subscribe(buffer -> {
CharBuffer charBuffer = StandardCharsets.UTF_8.decode(buffer.asByteBuffer());
DataBufferUtils.release(buffer);
bodyRef.set(charBuffer.toString());
});
//获取request body
return bodyRef.get();
}
private DataBuffer stringBuffer(String value) {
byte[] bytes = value.getBytes(StandardCharsets.UTF_8);
NettyDataBufferFactory nettyDataBufferFactory = new NettyDataBufferFactory(ByteBufAllocator.DEFAULT);
DataBuffer buffer = nettyDataBufferFactory.allocateBuffer(bytes.length);
buffer.write(bytes);
return buffer;
}
以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。
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