java - 未生成 Zip 文件

Question

我的 springboot 应用程序中有这个方法，它在 custom_users 目录中生成 3 个 CSV 文件(与员工、客户和建筑物相关)，其名称后附加了时间戳，如下所示。 目前，它仅生成两个 CSV 文件(公司和建筑相关)，因为我正在测试 employee_custom_file 的 zip 文件相关转换，如下所示。

有人能告诉我在使用CSVWriter(来自opencsv)将员工相关内容转换为zip文件时做错了什么吗？我原本期望 1 个 zip 文件与另外 2 个 CSV 文件一起显示，但由于某种原因，只生成 2 个 CSV 文件。

基本上，下面代码中的这部分没有按我的预期工作:

ZipEntry entry = new ZipEntry(file.getFileName().toString());
zos.putNextEntry(entry);
try {
    CSVWriter writer = new CSVWriter( new OutputStreamWriter(zos,StandardCharsets.UTF_8)))) {
        writer.writeAll(rsDemo, true);
    }

================================================== =====================

public void sendMessage(String msg) throws DaoException {

        DataSource ds = null;
        Connection conn = null;
        PreparedStatement pstmt = null;
        PreparedStatement pstmtEmployee = null;
        PreparedStatement pstmtCompany = null; 
        PreparedStatement pstmBuilding = null; 

        ResultSet rs = null;
        ResultSet rsDemo = null;
        ResultSet rsCompany = null;
        ResultSet rsBuildings = null;


         String[] parts = msg.split("#");
         String requestID = parts[0].trim();
         String userName = parts[1].trim();
         String applicationName = parts[2].trim();

        logger.info("Request ID "+requestID);
        logger.info("User Name "+userName);
        logger.info("Application Name "+applicationName);



         try {

                ds = jdbcTemplate.getDataSource();
                conn = ds.getConnection();  

                /*===========================================================================*/
                /*    Code to generate a employee CSV file              */ 
                /*===========================================================================*/
                pstmtEmployee = conn.prepareStatement(getPatientEmployeeSQL);
                pstmtEmployee.setString(1, requestID);
                rsDemo = pstmtEmployee.executeQuery();

                ResultSetMetaData rsmd = rsDemo.getMetaData();

                 FileOutputStream fos = new FileOutputStream("your_files.zip");
                 BufferedOutputStream bos = new BufferedOutputStream(fos);
                 ZipOutputStream zos = new ZipOutputStream(bos);

                 Path dir = Paths.get("/srv/custom_users", userName);
                 Files.createDirectories(dir);

                 Path file = dir.resolve("employee_custom_file" + unixTimestamp + ".csv");
                 /*try (CSVWriter writer = new CSVWriter(Files.newBufferedWriter(file))) {
                     writer.writeAll(rsDemo, true);
                 }*/
                 ZipEntry entry = new ZipEntry(file.getFileName().toString());
                 zos.putNextEntry(entry);
                 try (CSVWriter writer = new CSVWriter(new OutputStreamWriter(zos,StandardCharsets.UTF_8)))) {
                     writer.writeAll(rsDemo, true);
                 }


                 logger.info("Employee File Generated");



                 /*===========================================================================*/
                 /*    Code to generate a company CSV file                                      */ 
                 /*===========================================================================*/

                pstmtCompany = conn.prepareStatement(getCompanySQL);
                pstmtCompany.setString(1, requestID);
                rsCompany = pstmtCompany.executeQuery();

                ResultSetMetaData rsmdFacts = rsCompany.getMetaData();


                 Path filecompany = dir.resolve("company_custom_file_" + unixTimestamp + ".csv");
                 try (CSVWriter writer = new CSVWriter(Files.newBufferedWriter(filecompany))) {
                     writer.writeAll(rsCompany, true);
                 }

                 logger.info("Company CSV File Generated");


                 /*===========================================================================*/
                 /*    Code to generate a building CSV file                                 */ 
                 /*===========================================================================*/

                 pstmBuilding = conn.prepareStatement(getBuildingSQL);
                  pstmBuilding.setString(1, requestID);
                  rsBuildings = pstmBuilding.executeQuery();

                   ResultSetMetaData rsmdBuildings = rsBuildings.getMetaData();


                    Path fileBuildings = dir.resolve("building_custom_file_" + unixTimestamp + ".csv");
                     try (CSVWriter writer = new CSVWriter(Files.newBufferedWriter(fileBuildings))) {
                         writer.writeAll(rsBuildings, true);
                     }

                    logger.info("Buildings CSV File Generated");




                }
            catch(Throwable th) {
                throw new DaoException(th.getMessage(), th);
            }
            finally {
                //resource Closing statements

            }   



    }

Answer 1

您是否调用了代码示例中省略的 closeEntry？

请注意，对 zip 输出流的写入是针对支持输出流的任何内容。 “写入”条目会写入 zip 流，而不是磁盘，除非输出流是这样设置的。

来自ZipOutputStream:

/**
 * Closes the current ZIP entry and positions the stream for writing
 * the next entry.
 * @exception ZipException if a ZIP format error has occurred
 * @exception IOException if an I/O error has occurred
 */
public void closeEntry() throws IOException {