resttemplate下载文件

最新推荐文章于 2024-06-03 14:44:04 发布

转载最新推荐文章于 2024-06-03 14:44:04 发布 · 1w 阅读

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本文介绍了一种使用Spring的RestTemplate结合自定义请求头来下载指定URL图片的方法，并通过设置Accept头为application/jpg实现对特定类型图片的支持。

@Override
	public byte[] downloadImageByUrl(String imageUrl) {
		// TODO Auto-generated method stub
		requireAuthorization();
		ClientHttpRequestInterceptor acceptHeaderPdf = new AcceptHeaderHttpRequestInterceptor(
				"application/jpg");

		List<ClientHttpRequestInterceptor> clist = new ArrayList<ClientHttpRequestInterceptor>();
		clist.add(acceptHeaderPdf);
		restTemplate.setInterceptors(clist);

		byte[] response = restTemplate.getForObject(imageUrl, byte[].class);

		return response;
	}

	class AcceptHeaderHttpRequestInterceptor implements
			ClientHttpRequestInterceptor {
		private final String headerValue;

		public AcceptHeaderHttpRequestInterceptor(String headerValue) {
			this.headerValue = headerValue;
		}

		@Override
		public ClientHttpResponse intercept(HttpRequest request, byte[] body,
				ClientHttpRequestExecution execution) throws IOException {

			HttpRequestWrapper requestWrapper = new HttpRequestWrapper(request);
			List<MediaType> mytype = new ArrayList<MediaType>();
			mytype.add(MediaType.valueOf(headerValue));
			requestWrapper.getHeaders().setAccept(mytype);

			return execution.execute(requestWrapper, body);
		}
	}

参考：http://www.ignite.ee/resttemplate-with-custom-http-headers/