在Spring Cloud Gateway中获取请求体(body)参数的方法与在普通的Spring应用程序中略有不同。Spring Cloud Gateway使用org.springframework.cloud.gateway.filter.factory.rewrite.ModifyRequestBodyGatewayFilterFactory
过滤器工厂来修改请求体。下面是一个获取请求体参数的例子:
@Component
public class CustomGlobalFilter implements GlobalFilter, Ordered {
@Override
public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
ServerHttpRequest request = exchange.getRequest();
HttpHeaders headers = request.getHeaders();
HttpMethod method = request.getMethod();
// 检查请求是否包含请求体
boolean hasBody = headers.getContentLength() > 0 || headers.getContentType() != null;
if (hasBody) {
// 从请求体中获取参数
return DataBufferUtils.join(exchange.getRequest().getBody())
.flatMap(dataBuffer -> {
byte[] bytes = new byte[dataBuffer.readableByteCount()];
dataBuffer.read(bytes);
String body = new String(bytes, Charset.forName("UTF-8"));
// 此处可以对请求体进行处理
exchange.getAttributes().put("cachedRequestBodyObject", body);
return chain.filter(exchange.mutate().request(request.mutate()
.header("Content-Type", "application/json")
.body(Mono.just(DataBufferUtils.createByteBuffer(body.getBytes())))).build());
});
}
return chain.filter(exchange);
}
@Override
public int getOrder() {
return -1;
}
}
这个例子中,我们首先检查请求是否包含请求体,如果包含,则从请求体中获取参数。然后,我们可以对请求体进行处理(例如,解析JSON),并将参数缓存到cachedRequestBodyObject
属性中。最后,我们使用修改请求体的过滤器ModifyRequestBodyGatewayFilterFactory
来更新请求体,并继续执行过滤器链。