创建Excel，解析Excel，处理CSV Injection

1.使用Apache POI创建和解析Excel

• Maven依赖

• <!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
  <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi</artifactId>
      <version>3.17</version>
  </dependency>
  
  <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
  <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi-ooxml</artifactId>
      <version>3.17</version>
  </dependency>

   

2.本地创建Excel

3.如何处理CSV Injection

• 如果遇到=,+,-,@符号特殊字符打头的值，那么我会在其值前面加一个tab键，这样在excel里面tab键不会显示，但实际上有该值前面有个tab键。
• 下载：用户下载excel的时候，对于特殊字符打头的我们加一个tab键
• 上传：用户修改好excel内容，上传到系统的时候，我们需要trim一下
• 作用：防止CSV 注入；用户在界面上填写的内容生成excel，之后上传到界面以后展示才能够保持一致。

4.具体代码（做了trim）

public class Leo_Test
{
    public static void main(String[] args) throws IOException, EncryptedDocumentException, InvalidFormatException, org.apache.poi.openxml4j.exceptions.InvalidFormatException{
      //Blank workbook
        XSSFWorkbook xssfWorkbook = new XSSFWorkbook();
        //Create a blank sheet
        XSSFSheet sheet = xssfWorkbook.createSheet("test");
        //This data needs to be written (Object[])
        Map<String, Object[]> data = new TreeMap<String, Object[]>();
        data.put("1", new Object[]{ "ID", "NAME", "LAST NAM E" });
        data.put("2", new Object[]{ 1, "=calc|A!Z", "-3+2" });
        //Iterate over data and write to sheet
        Set<String> keyset = data.keySet();
        int rownum = 0;
        for (String key : keyset)
        {
            Row row = sheet.createRow(rownum++);
            Object[] objArr = data.get(key);
            int cellnum = 0;
            for (Object obj : objArr)
            {
                Cell cell = row.createCell(cellnum++);
                if (obj instanceof String)
                {
                    if(((String) obj).startsWith("=")||((String) obj).startsWith("+")||((String) obj).startsWith("-")||((String) obj).startsWith("@"))
                    {
                        StringBuffer sb = new StringBuffer();
                        sb.append("t").append(obj);
                        cell.setCellValue(sb.toString());
                    }
                    else
                    {
                        cell.setCellValue((String) obj);
                    }
                }
                    
                    
                else if (obj instanceof Integer)
                    cell.setCellValue((Integer) obj);
            }
        }
        try
        {
            //Write the workbook in file system
            FileOutputStream out = new FileOutputStream(new File("test.xlsx"));
            xssfWorkbook.write(out);
            out.close();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        
        System.out.println("I will read excel content");
        File file = new File("test.xlsx");
        readFileContent(file);
        
    }
    
    private static void readFileContent(File file) throws EncryptedDocumentException, org.apache.poi.openxml4j.exceptions.InvalidFormatException, IOException
    {
        FileInputStream fileInputStream = new FileInputStream(file);
        Workbook workbook = WorkbookFactory.create(fileInputStream);
        if (null != workbook)
        {
            //to get each cell value of excel
            for (int i = 0; i < workbook.getNumberOfSheets(); i++)
            {
                Sheet sheet = workbook.getSheetAt(i);
                Iterator<Row> rowIterator = sheet.iterator();
                while (rowIterator.hasNext())
                {
                    Row row = rowIterator.next();
                    Iterator<Cell> cellIterator = row.iterator();
                    while (cellIterator.hasNext())
                    {
                        Cell cell = cellIterator.next();
                        DataFormatter dataFormatter = new DataFormatter();
                        String cellValue = dataFormatter.formatCellValue(cell);
                        System.out.println(cellValue.trim());
                    }
                }
            }
        }
    }
}

5.结果

• 生成的excel
• 
• 
• 做了trim，打印到控制台结果
• 
• 未做trim的话，打印到控制台结果

最后

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