使用JAX-RS客户端从REST服务下载文件

Question

我试图使用JAX-RS从REST服务下载文件.这是我的代码,它通过发送GET请求来调用下载:

private Response invokeDownload(String authToken, String url) {
    // Creates the HTTP client object and makes the HTTP request to the specified URL
    Client client = ClientBuilder.newClient();
    WebTarget target = client.target(url);

    // Sets the header and makes a GET request
    return target.request().header("X-Tableau-Auth", authToken).get();
}

但是,我遇到将Response转换为实际File对象的问题.所以我做的是以下内容:

public File downloadWorkbook(String authToken, String siteId, String workbookId, String savePath)
        throws IOException {
    String url = Operation.DOWNLOAD_WORKBOOK.getUrl(siteId, workbookId);
    Response response = invokeDownload(authToken, url);

    String output = response.readEntity(String.class);
    String filename; 
// some code to retrieve the filename from the headers
    Path path = Files.write(Paths.get(savePath + "/" + filename), output.getBytes());
    File file = path.toFile();
    return file;
}

创建的文件无效,我调试了代码并注意到输出包含类似的字符串(更大):

PK͢ F [Superstore.twb ysI 7 dߡ m3 f

看起来像二进制.显然代码有问题.

如何从Response对象获取HTTP响应主体作为字符串？

编辑: 引用来自REST API参考的HTTP响应:

响应机构

以下之一,具体取决于工作簿的格式:

.twb格式的工作簿内容(Content-Type:application/xml)
.twbx格式的工作簿内容(Content-Type:application/octet-stream)

Answer 1

正如您自己注意到的那样,您在这里处理二进制数据.因此,您不应该从响应中创建String.最好获取输入流并将其传输到您的文件中.

Response response = invokeDownload(authToken, url);
InputStream in = response.readEntity(InputStream.class);
Path path = Paths.get(savePath, filename);
Files.copy(in, path);