Question

为什么我的下载文件总是被破坏。

我有一个使用blob上传文件的代码。代码是 InputStream inputStream = new FileInputStream(new File(filePath)); //the file to upload pst.setBinaryStream(15, inputStream); //to upload the selected file

它成功上传到我的sql数据库但是当我尝试下载它时，它总是被破坏了。下面是我从sql下载文件的代码。

try
             {
                    Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
                    String url1 = "jdbc:sqlserver://ets88-spare:1433;databaseName=users;user=sa;password=test";
                    Connection conn1 = DriverManager.getConnection(url1);
                    String query1 = "SELECT * FROM ets_verification";
                    Statement state = conn1.createStatement();
                    ResultSet rs = state.executeQuery(query1);
                    while (rs.next())
                    {        
                        String boardname = jboardName.getSelectedItem().toString();
                        String sn = jserialNumber.getText();
                        String status = jverificationStatus.getSelectedItem().toString();
                        String filename = boardname + "_" + "_" + sn + "_"+ status;
                        byte[] array = rs.getBytes(16);
                         FileOutputStream fos = new FileOutputStream("c:\\" + filename + ".rar");
                            fos.write(array);
                            fos.close();

                        System.out.println("array:" + array);
                }              
             }
             catch (ClassNotFoundException | SQLException e)
             {
                     jnote.setText(e.toString());
                     System.out.println("error" + e.toString());
    }       catch (IOException ex) {
                Logger.getLogger(ets_verification.class.getName()).log(Level.SEVERE, null, ex);
            }

Answer 1

你可以试试。在ORACLE DB中测试。

(...)
Blob blob = rs.getBlob(16);
if (blob != null) {
    byte[] b = blob.getBytes(1, (int) blob.length());
    try (FileOutputStream fos = new FileOutputStream("PATH/TO/FILE/FILENAME.rar")){
        fos.write(file);
    }catch (IOException ex) {
        //Do something
    }
}
(...)

blob到文件转换期间文件被破坏（java）

1 个答案: