Java 如何从球衣响应中保存文件？
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How to save a file from jersey response?
提问by Jean-Fran?ois Savard
I am trying to download a SWF file using Jersey from a web resource.
我正在尝试使用 Jersey 从 Web 资源下载 SWF 文件。
I have written the following code, but am unable to save the file properly :
我编写了以下代码，但无法正确保存文件：
Response response = webResource.request(MediaType.APPLICATION_OCTET_STREAM)
.cookie(cookie)
.post(Entity.entity(form, MediaType.APPLICATION_FORM_URLENCODED_TYPE));
String binarySWF = response.readEntity(String.class);
byte[] SWFByteArray = binarySWF.getBytes();
FileOutputStream fos = new FileOutputStream(new File("myfile.swf"));
fos.write(SWFByteArray);
fos.flush();
fos.close();
It is save to assume that the response does return a SWF file, as response.getMediaTypereturns application/x-shockwave-flash.
假设响应确实返回 SWF 文件，如response.getMediaType返回application/x-shockwave-flash.
However when I try to open the SWF, nothing happen (also no error) which suggest that my file was not created from response.
但是，当我尝试打开 SWF 时，没有任何反应（也没有错误）表明我的文件不是从响应中创建的。
采纳答案by ocroquette
From Java 7 on, you can also make use of the new NIO API to write the input stream to a file:
从 Java 7 开始，您还可以使用新的 NIO API 将输入流写入文件：
InputStream is = response.readEntity(InputStream.class)
Files.copy(is, Paths.get(...));
回答by peter.petrov
I think you should not go through a String at all.
我认为你根本不应该通过一个字符串。
If the response is really the SWF file (binary data), then here:
如果响应确实是 SWF 文件（二进制数据），那么这里：
String binarySWF = response.readEntity(String.class);
instead of this code (which reads a String), just try reading
a byte array. See if it helps. Strings are related to encodings
and probably that messes things up.
而不是这个代码（它读取一个字符串），只需尝试读取
一个字节数组。看看它是否有帮助。字符串与编码有关
，可能会把事情搞砸。
回答by Jean-Fran?ois Savard
I've finally got it to work.
我终于让它工作了。
I figured out reading the Jersey API that I could directly use getEntityto retrieve the InputStream of the response(assuming it has not been read yet).
我想通了阅读 Jersey API，我可以直接使用它getEntity来检索的 InputStream response（假设它还没有被读取）。
Using getEntityto retrieve the InputStreamand IOUtils#toByteArraywhich create a byte array from an InputStream, I managed to get it to work :
使用getEntity检索InputStream和IOUtils#toByteArray其创建从一个字节数组InputStream，我设法得到它的工作：
Response response = webResource.request(MediaType.APPLICATION_OCTET_STREAM)
.cookie(cookie)
.post(Entity.entity(form, MediaType.APPLICATION_FORM_URLENCODED_TYPE));
InputStream input = (InputStream)response.getEntity();
byte[] SWFByteArray = IOUtils.toByteArray(input);
FileOutputStream fos = new FileOutputStream(new File("myfile.swf"));
fos.write(SWFByteArray);
fos.flush();
fos.close();
Note that IOUtilsis a common Apache function.
请注意，IOUtils是一个常见的 Apache 函数。
