maven依赖：

      <dependency>
          <groupId>xml-apis</groupId>
          <artifactId>xml-apis</artifactId>
          <version>1.4.01</version>
      </dependency>
      <!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
      <dependency>
          <groupId>org.apache.poi</groupId>
          <artifactId>poi</artifactId>
          <version>4.0.0</version>
      </dependency>
      <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
      <dependency>
          <groupId>org.apache.poi</groupId>
          <artifactId>poi-ooxml</artifactId>
          <version>4.0.0</version>
      </dependency>
      <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-scratchpad -->
      <dependency>
          <groupId>org.apache.poi</groupId>
          <artifactId>poi-scratchpad</artifactId>
          <version>4.0.0</version>
      </dependency>

代码：

 private static void excel() {
        try (FileInputStream fis = new FileInputStream("d:\\in.xlsx");
             FileOutputStream fos = new FileOutputStream("d:\\out.xlsx")) {
            // 输入
            XSSFWorkbook in = new XSSFWorkbook(fis);
            XSSFSheet sheetIn = in.getSheetAt(0);
            //输出
            XSSFWorkbook out = new XSSFWorkbook();
            XSSFSheet sheetOut = out.createSheet("one");
            //获取表格最后一行的行数（从0开始）
            int rowNum = sheetIn.getLastRowNum();
            for (int i = 0; i <= rowNum; i++) {
                //获取指定行的列数
                XSSFRow row = sheetIn.getRow(i);
                XSSFCell c = row.getCell(0);
                //获取指定列的内容，先按照字符串取，报异常在按照number取
                String one;
                try {
                    one = c.getStringCellValue();
                } catch (Exception e) {
                    one = c.getRawValue();
                }
                XSSFCell c1 = row.getCell(1);
                String two = c1.getStringCellValue();
                //正则格式过滤
                Matcher matcher = PATTERN_TWO.matcher(two);
                two = matcher.replaceAll("");
                two = clearFormat(two);

                //输出创建行
                XSSFRow rowOut = sheetOut.createRow(i);
                XSSFCell co = rowOut.createCell(0);
                co.setCellValue(one);
                XSSFCell co1 = rowOut.createCell(1);
                co1.setCellValue(two);
            }
            out.write(fos);
            in.close();
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }