Java如何使用 HTTP 请求下载图片
工具类：public FileInputStream fileDownload(String fileLink) throws Exception {
System.out.println("==============开始下载"+fileLink);
// 转码中文
URL url = new URL(encodeURLChinese(fileLink));
System.out.println("fileLink:======================"+url);
// 开始下载
TrustStrategy acceptingTrustStrategy = (chain, authType) -> true;
SSLContext sslContext = SSLContexts.custom().loadTrustMaterial(null, acceptingTrustStrategy).build();
SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext, NoopHostnameVerifier.INSTANCE);
HttpClientBuilder clientBuilder = HttpClients.custom();
CloseableHttpClient httpClient = clientBuilder.setSSLSocketFactory(sslsf).build();
HttpComponentsClientHttpRequestFactory httpRequestFactory = new HttpComponentsClientHttpRequestFactory();
httpRequestFactory.setConnectTimeout(30000);
httpRequestFactory.setConnectionRequestTimeout(30000);
httpRequestFactory.setReadTimeout(30000);
httpRequestFactory.setHttpClient(httpClient);
RestTemplate template = new RestTemplate(httpRequestFactory);
// 避免二次转码
DefaultUriBuilderFactory uriBuilderFactory = new DefaultUriBuilderFactory();
uriBuilderFactory.setEncodingMode(DefaultUriBuilderFactory.EncodingMode.NONE);
template.setUriTemplateHandler(uriBuilderFactory);
HttpHeaders headers = new HttpHeaders();
HttpEntity<org.springframework.core.io.Resource> httpEntity = new HttpEntity<org.springframework.core.io.Resource>(headers);
ResponseEntity<byte[]> response = template.exchange(url.toString(), HttpMethod.GET,
httpEntity, byte[].class);
byte[] body = response.getBody();
// 创建临时文件
File tempFile = File.createTempFile("temp", ".png");
// 将 byte[] 写入临时文件
try (FileOutputStream fos = new FileOutputStream(tempFile)) {
if (body != null) {
fos.write(body);
}
}
// 创建 FileInputStream 对象
FileInputStream stream = new FileInputStream(tempFile);
System.out.println("=============下载结束");
// 最后，记得在使用完后删除临时文件
tempFile.delete();
return stream;
}
publicString encodeURLChinese(String url) {
if (StringUtils.isEmpty(url)) {
return null;
}
url = StringUtils.trim(url);
try {
if (!needEncoding(url)) {
// 不需要编码
return url;
} else {
// 需要编码
String allowChars = ".!*'();:@&=+_\\-$,/?#\\[\\]{}|\\^~`<>%\"";
// StringallowChars = ".!*'();:@&=+_\\-$,/?#\\[\\]{}|\\^~`<>%\"";
// UTF-8 大写
return encode(url, "UTF-8", allowChars, false);
}
} catch (Exception e) {
throw new RuntimeException(e);
}
} 测试代码
@GetMapping("export")
public WebResult<?> exportTeaAndStu() {
try {
String url = "https://6c6f-lowcode-9g7kjvsl444eff34-1304647831.tcb.qcloud.la/weda-uploader/7cafc8106cb7cddf27b11dc5c8673562-imageaaa.png?sign=70c4c8a6372fb8b8c743b996a4d1e7b0&t=1723021617";
String aa = "http://localhost:1401/weda/myLecture/main/speaker/getPhotoByPhotoName?photoName=45550120240510094227.png";
String fileName = "777";
//通过链接返回一个输入流
FileInputStream stream = fileDownload(url);
minioUtil.uploadInputStream("mpbucket", "sjs/wdjz/zjrgl" + "/" + fileName + ".png", stream);
return WebResult.ok();
} catch (Exception e) {
return WebResult.error(e.getMessage());
}
}
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