Java 从 Apache IOUtils 转换的字符串中取回 InputStream

问题描述

我正在使用库 Sharepoint-Java-API 从 Sharepoint 下载文件。
我能够下载文件，但获得了 String 格式，该格式使用 org.apache.commons.io.IoUtils as

进行了转换

public static String get(Pair<String,String> token,String url) {
    CloseableHttpClient httpClient = HttpClients.createDefault();
    try {
        HttpGet getRequest = new HttpGet(url);
        getRequest.addHeader("Cookie",token.getLeft() + ";" + token.getRight());
        getRequest.addHeader("accept","application/json;odata=verbose");
        HttpResponse response = httpClient.execute(getRequest);
        if (response.getStatusLine().getStatusCode() == 200) {
            return IoUtils.toString(response.getEntity().getContent(),"utf-8");
        } else {
            System.err.println("Failed : HTTP error code : " + response.getStatusLine().getStatusCode() + "," + url);
            return null;
        }
    } catch (ClientProtocolException e) {
        e.printstacktrace();
    } catch (IOException e) {
        e.printstacktrace();
    } finally {
        try {
            httpClient.close();
        } catch (IOException ex) {
            Logger.getLogger(SPOnlineMFT.class).error(ex);
        }
    }
    return null;
}

现在我正在尝试将其转换为 InputStream 并将其保存在本地文件系统以供测试

来电者：-

String content = SPOnline.get(token,domain,url );
if (content != null) {
    File targetFile = new File("D:\\Rivian\\SharePoint\\TempDownload/"+fileName);
//  InputStream stream = new ByteArrayInputStream(content.getBytes("utf-8"));
    InputStream stream = IoUtils.toInputStream(content,"utf-8");
    Files.copy(stream,targetFile.toPath(),StandardcopyOption.REPLACE_EXISTING);
    System.out.println("File Downloaded")
}

但我无法读取/打开文件，例如MS excel 文件。打开文件时收到文件损坏的消息。

解决方法

直接将字节数组写入文件即可，无需将其转换为utf-8字符串。

import java.nio.file.Files;
import java.nio.file.Path;

Path file = Path.of("D:\\SharePoint\\TempDownload/"+fileName);
Files.write(file,response.getEntity().getContent()));