EXCEL template generation tool media in the Java class library

EXCEL template generation tool media in the Java class library In Java development, we sometimes need to generate excel files and fill in data according to a certain template format.This demand is very common in data export and report generation.In order to simplify this process, some excellent Excel template generation tools have emerged in the Java class library. They can help us more conveniently generate Excel files, while retaining the styles and formats in the template, improving development efficiency. Here are the Excel template generation tools in several commonly used Java libraries. 1. Apache POI Apache Poi is an open source project of the Apache Foundation, which provides the function of Java processing Microsoft Office format files.Among them, the HSSF module is a module used to process Excel files. Through the POI API, you can directly read and write Excel files, and support the merger file and data to generate new files. The following is an example code for generating an excel template with Apache Poi: // Create a data model Map<String, Object> dataModel = new HashMap<>(); dataModel.put("name", "John"); dataModel.put("age", 30); dataModel.put("email", "john@example.com"); // Load the excel template file InputStream template = new FileInputStream("template.xlsx"); Workbook workbook = WorkbookFactory.create(template); Sheet sheet = workbook.getSheetAt(0); // Fill in data to the template Row row = sheet.getRow(1); Cell cell = row.getCell(0); cell.setCellValue(dataModel.get("name").toString()); cell = row.getCell(1); cell.setCellValue(Integer.parseInt(dataModel.get("age").toString())); cell = row.getCell(2); cell.setCellValue(dataModel.get("email").toString()); // Save the generated excel file FileOutputStream outputFile = new FileOutputStream("output.xlsx"); workbook.write(outputFile); // Close flowing template.close(); outputFile.close(); 2. Jxls JXLS is an Excel template engine that can define dynamic content in Excel templates and generate Java code for generation.It supports the combination of the Java data set with the Excel template to generate the final Excel file.JXLS is simple and generated with good compatibility. The following is an example code that uses JXLS to generate Excel templates: // Create a data model List<Employee> employeeList = new ArrayList<>(); employeeList.add(new Employee("John", 30, "john@example.com")); employeeList.add(new Employee("Alice", 25, "alice@example.com")); employeeList.add(new Employee("Bob", 35, "bob@example.com")); // Load the Excel template InputStream template = new FileInputStream("template.xlsx"); OutputStream outputStream = new FileOutputStream("output.xlsx"); // Export data to the template Context context = new Context(); context.putVar("employees", employeeList); JxlsHelper.getInstance().processTemplate(template, outputStream, context); // Close flowing template.close(); outputStream.close(); 3. EasyExcel EasyExcel is a powerful and easy -to -use Java Excel reading and writing solution.It uses a simple syntax to quickly realize the reading and generation of Excel files.EasyExcel supports reading and writing a lot of data, and has good performance. The following is a sample code for generating excel templates using EasyExcel: // Create a data model List<Employee> employeeList = new ArrayList<>(); employeeList.add(new Employee("John", 30, "john@example.com")); employeeList.add(new Employee("Alice", 25, "alice@example.com")); employeeList.add(new Employee("Bob", 35, "bob@example.com")); // Write into the excel file String filename = "output.xlsx"; EasyExcel.write(filename, Employee.class).sheet("Sheet1").doWrite(employeeList); The above is the introduction and example code of the Excel template generation tools in the common Java library.According to project needs and personal preferences, choosing the appropriate tools can greatly simplify the process of generating Excel templates and improve development efficiency.