如何使用Java在Google Cloud Storage中插入pdf文件

Question

I have been trying to upload a pdf file on Google Cloud Storage using my application but I am unable to do so.I have searched the net and found the below given code but the problem is that this code is useful in uploading txt file but not pdf file.When I try to upload pdf file it uploads successfully but when I try to open it it doesn't open.I am using the following code: 我一直在尝试使用我的应用程序将pdf文件上传到Google云端存储，但我无法这样做。我已经在网上搜索了以下给出的代码，但问题是该代码对于上传txt文件很有用，但不能pdf文件。当我尝试上传pdf文件时，它成功上传，但是当我尝试打开它时，它没有打开。我正在使用以下代码：

protected void doPost(HttpServletRequest req, HttpServletResponse resp)
    throws ServletException, IOException {
RequestDispatcher rd=req.getRequestDispatcher("career-registration-successfull.jsp");
RequestDispatcher rd1=req.getRequestDispatcher("career-registration-failed.jsp");
String name="";
String email="";
long whatsapp=0;
long number=0;
String query="";
int flag1=0;
int flag2=0;
isMultipart = ServletFileUpload.isMultipartContent(req);
resp.setContentType("text/html");
java.io.PrintWriter out = resp.getWriter( );
FileInputStream fileInputStream = new FileInputStream("C:\\Users\\Subhanshu Bigasia\\Desktop\\Amazon.pdf");
Storage storage = StorageOptions.getDefaultInstance().getService();
Bucket bucket=storage.get(("combucket1eduvitae7"));
ServletFileUpload sfu = new ServletFileUpload(new DiskFileItemFactory());
String targetFileStr="";
try {
    List<FileItem>  fileName = sfu.parseRequest(req);
     for(FileItem f:fileName)
        {
        try {
            f.write (new File("C:\\Users\\Subhanshu Bigasia\\Desktop\\Afcat.pdf"));
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //targetFileStr = readFile("/Users/tkmajdt/Documents/workspace/File1POC1/" + f.getName(),Charset.defaultCharset());
        targetFileStr = new String(Files.readAllBytes(Paths.get("C:\\Users\\Subhanshu Bigasia\\Desktop\\Afcat.pdf")));
        }
}
catch(Exception e) {
    e.printStackTrace();
}
BlobId blobId = BlobId.of("combucket1eduvitae", "my_blob_name1");
//Blob blob = bucket.create("my_blob_name1", targetFileStr.getBytes(), "text/plain");
Blob blob=bucket.create("myblob",fileInputStream, "text");

Can someone help in solving this problem. 有人可以帮助解决这个问题。
Thank You in Advance 先感谢您

Answer 1

I solved the problem by using the below code: 我通过使用以下代码解决了这个问题：

String name="";
String email="";
long whatsapp=0;
long number=0;
String query="";
int flag1=0;
int flag2=0;
boolean isMultipart = ServletFileUpload.isMultipartContent(req);
resp.setContentType("text/html");
java.io.PrintWriter out = resp.getWriter( );
    if( !isMultipart ) {
   out.println("<html>");
   out.println("<head>");
   out.println("<title>Servlet upload</title>");  
   out.println("</head>");
   out.println("<body>");
   out.println("<p>No file uploaded</p>"); 
   out.println("</body>");
   out.println("</html>");
   return;
}

DiskFileItemFactory factory = new DiskFileItemFactory();

// maximum size that will be stored in memory
factory.setSizeThreshold(maxMemSize);

// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);

// maximum file size to be uploaded.
upload.setSizeMax( maxFileSize );

try { 
   // Parse the request to get file items.
   List fileItems = upload.parseRequest(req);

   // Process the uploaded file items
   Iterator i = fileItems.iterator();

   out.println("<html>");
   out.println("<head>");
   out.println("<title>Servlet upload</title>");  
   out.println("</head>");
   out.println("<body>");

   while ( i.hasNext () ) {
      FileItem fi = (FileItem)i.next();
      if ( !fi.isFormField () ) {
         // Get the uploaded file parameters
        try { String fieldName = fi.getFieldName();
         String fileName = fi.getName();
         String contentType = fi.getContentType();
         boolean isInMemory = fi.isInMemory();
         long sizeInBytes = fi.getSize();
         Date date=new Date();             
         System.out.println(("Uploaded Filename: " + fileName + "<br>"));
         flag1=1;
         File f1=new File("C:\\Users\\Subhanshu Bigasia\\Desktop\\amazon2.pdf");
         FileInputStream fileInputStream = (FileInputStream) fi.getInputStream();
         Storage storage = StorageOptions.getDefaultInstance().getService();
         Bucket bucket=storage.get(("combucket1eduvitae7"));
         ServletFileUpload sfu = new ServletFileUpload(new DiskFileItemFactory());
         BlobId blobId = BlobId.of("combucket1eduvitae", "my_blob_name1");
         //Blob blob = bucket.create("my_blob_name1", targetFileStr.getBytes(), "application/pdf");
         Blob blob=bucket.create(fileName+" "+date.toString(),fileInputStream,"application/pdf");
         flag1=1;
        }
        catch(Exception e) {
            flag1=0;
            e.printStackTrace();
        }
      }

Notice that I have used 请注意，我已经使用
Blob blob=bucket.create(fileName+" "+date.toString(),fileInputStream,"application/pdf"); Blob blob = bucket.create（fileName +“” + date.toString（），fileInputStream，“ application / pdf”）; instead of 代替
Blob blob=bucket.create(fileName+" "+date.toString(),fileInputStream,"text/plain"); Blob blob = bucket.create（fileName +“” + date.toString（），fileInputStream，“ text / plain”）;

Answer 2

First follow the Cloud Storage Client Libraries for Java documentation which will get you started. 首先，遵循Java的Cloud Storage Client Libraries文档，这将帮助您入门。

Than you can try this example for uploading files to Cloud Storage bucket using Java ( found here ): 比您可以尝试使用Java（在此处找到）将文件上传到Cloud Storage存储桶的示例：

/**
   * Uploads data to an object in a bucket.
   *
   * @param name the name of the destination object.
   * @param contentType the MIME type of the data.
   * @param file the file to upload.
   * @param bucketName the name of the bucket to create the object in.
   */
  public static void uploadFile(
      String name, String contentType, File file, String bucketName)
      throws IOException, GeneralSecurityException {
    InputStreamContent contentStream = new InputStreamContent(
        contentType, new FileInputStream(file));
    // Setting the length improves upload performance
    contentStream.setLength(file.length());
    StorageObject objectMetadata = new StorageObject()
        // Set the destination object name
        .setName(name)
        // Set the access control list to publicly read-only
        .setAcl(Arrays.asList(
            new ObjectAccessControl().setEntity("allUsers").setRole("READER")));

    // Do the insert
    Storage client = StorageFactory.getService();
    Storage.Objects.Insert insertRequest = client.objects().insert(
        bucketName, objectMetadata, contentStream);

    insertRequest.execute();
  }

You can find easy to follow getting started tutorial in the GitHub repository here . 你可以找到易于遵循入门教程在GitHub的仓库在这里。 Please take a look at Stack Overflow thread Upload image to Google Cloud Storage (Java) as well. 请查看堆栈溢出线程，还将图像上传到Google Cloud Storage（Java）。

如何使用Java在Google Cloud Storage中插入pdf文件

问题描述

2 个解决方案

解决方案1
1 已采纳 2018-08-07 20:24:36

解决方案2
0 2018-08-07 11:12:37

如何使用Java在Google Cloud Storage中插入pdf文件

问题描述

2 个解决方案

解决方案1 1 已采纳 2018-08-07 20:24:36

解决方案2 0 2018-08-07 11:12:37

解决方案1
1 已采纳 2018-08-07 20:24:36

解决方案2
0 2018-08-07 11:12:37