spring restTemplate

最新推荐文章于 2023-04-09 17:25:37 发布

原创最新推荐文章于 2023-04-09 17:25:37 发布 · 254 阅读

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本文深入探讨了Spring RestTemplate的默认工厂SimpleClientHttpRequestFactory的工作原理。该工厂使用HttpURLConnection来创建请求，根据配置选择是否缓冲请求体，并支持同步和异步请求处理。通过分析源码，理解其如何准备连接和选择合适的ClientHttpRequest实现。

在这里插入图片描述
spring restTemplate 默认工厂
SimpleClientHttpRequestFactory 使用 HttpURLConnection.openConnection()

public class SimpleClientHttpRequestFactory implements ClientHttpRequestFactory, AsyncClientHttpRequestFactory {
	...
		@Override
	public ClientHttpRequest createRequest(URI uri, HttpMethod httpMethod) throws IOException {
		HttpURLConnection connection = openConnection(uri.toURL(), this.proxy);
		prepareConnection(connection, httpMethod.name());

		if (this.bufferRequestBody) {
			return new SimpleBufferingClientHttpRequest(connection, this.outputStreaming);
		}
		else {
			return new SimpleStreamingClientHttpRequest(connection, this.chunkSize, this.outputStreaming);
		}
	}

	/**
	 * {@inheritDoc}
	 * <p>Setting the {@link #setTaskExecutor taskExecutor} property is required before calling this method.
	 */
	@Override
	public AsyncClientHttpRequest createAsyncRequest(URI uri, HttpMethod httpMethod) throws IOException {
		Assert.state(this.taskExecutor != null, "Asynchronous execution requires TaskExecutor to be set");

		HttpURLConnection connection = openConnection(uri.toURL(), this.proxy);
		prepareConnection(connection, httpMethod.name());

		if (this.bufferRequestBody) {
			return new SimpleBufferingAsyncClientHttpRequest(
					connection, this.outputStreaming, this.taskExecutor);
		}
		else {
			return new SimpleStreamingAsyncClientHttpRequest(
					connection, this.chunkSize, this.outputStreaming, this.taskExecutor);
		}
	}
	...