[英]Download zip file using java11 HttpClient.sendAsync()
我正在尝试使用 GitHub ZDB974238714CAA8DE634A7CE1DZ6Z 程序通过 java 程序下载 zip 文件。
我正在使用的程序如下:
public static void main(String[] args) {
// create client
HttpClient client = HttpClient.newHttpClient();
// create request
HttpRequest request = HttpRequest.newBuilder().uri(URI.create("https://api.github.com/repos/:owner/:repo/zipball/:ref")).build();
// use the client to send the asynchronous request
InputStream is = client.sendAsync(request, BodyHandlers.ofInputStream())
.thenApply(HttpResponse::body).join();
try {
FileOutputStream out = new FileOutputStream("outputZipFile.zip");
copy(is,out,1024);
out.close();
}catch(Exception e) {}
}
private static void copy(InputStream is, FileOutputStream out, int i) {
// TODO Auto-generated method stub
byte[] buf = new byte[i];
try {
int n = is.read(buf);
while(n>=0) {
out.write(buf,0,n);
n=is.read(buf);
}
out.flush();
}catch(IOException ioe) {
System.out.println(ioe.getStackTrace());
}
}
当我尝试运行它时,我得到了空的主体,因此 output 文件也将为空。 我注意到使用 Java11 HttpClient 的 HttpURLConnection 可以使它工作,但我更喜欢使用这个 Java11 功能来发送异步请求。
我不明白我做错了什么。
编辑:我目前使用的 HttpURLConnection 代码如下:
private void downloadVersion(String sha, String outputDestination) {
try {
URL url = new URL( getDownloadQuery(sha) );
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
if(authToken!=null)
connection.setRequestProperty("Authorization", "Bearer " + authToken) ;
connection.setRequestMethod("GET");
InputStream in = connection.getInputStream();
FileOutputStream out = new FileOutputStream(outputDestination);
copy(in, out, 1024);
out.close();
} catch (Exception e) {}
}
Your url (when set to correct github repos) may be returning redirect status 302. To make HTTP client follow redirects replace HttpClient client = HttpClient.newHttpClient()
with use of HttpClient.newBuilder()
. 您还可以通过尝试资源和使用InputStream.transferTo
来简化代码:
HttpClient client = HttpClient.newBuilder().followRedirects(Redirect.ALWAYS).build();
URI uri = URI.create("https://api.github.com/repos/:owner/:repo/zipball/:ref");
HttpRequest request = HttpRequest.newBuilder().uri(uri).build();
// use the client to send the asynchronous request
InputStream is = client.sendAsync(request, BodyHandlers.ofInputStream())
.thenApply(HttpResponse::body).join();
try (FileOutputStream out = new FileOutputStream("outputZipFile.zip")) {
is.transferTo(out);
}
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