几个使用hutool工具的方法

依赖jar包 ：  

	<dependency>
		<groupId>cn.hutool</groupId>
		<artifactId>hutool-all</artifactId>
		<version>4.6.4</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>
     <!-- 生成二维码依赖jar包 -->
    <dependency>
      <groupId>com.google.zxing</groupId>
      <artifactId>core</artifactId>
      <version>3.3.3</version>
    </dependency>

//读取excel文件
public static ExcelReader readData(String path) throws IOException {
  File file = FileUtil.file(path);
  InputStream is = new FileInputStream(file);
  return ExcelUtil.getReader(is, 0);
}
@Test
public void initTest() throws Exception {
  ExcelReader excelReader = ReadExcelUtil.readData("E:/log/ud_shop.xlsx");
  Sheet sheet = excelReader.getSheet();
  //  遍历每一行
  for (int rowIndex = 0; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
    Row row = sheet.getRow(rowIndex);
    if (row == null) {
      continue;
    }
    //  遍历每一行的每一列
    ShopVO shop = new ShopVO();
    shop.setUserId(userId);
    for (int cellIndex = 0; cellIndex < row.getLastCellNum(); cellIndex++) {
      Cell cell = row.getCell(cellIndex);
      if (cellIndex == 0) {
        shop.setName((String) excelReader.readCellValue(cellIndex,rowIndex));
      }else if (cellIndex == 1) {
        shop.setCoverUrl((String) excelReader.readCellValue(cellIndex,rowIndex));
      }else if (cellIndex == 2) {
        shop.setLogoUrl((String) excelReader.readCellValue(cellIndex,rowIndex));
      }else if (cellIndex == 3) {
        shop.setBrief((String) excelReader.readCellValue(cellIndex,rowIndex));
      }else {
        shop.setAddr((String) excelReader.readCellValue(cellIndex,rowIndex));
      }
    }
    log.info("shop={}",shop);
    // shopProvider.insert(shop);
  }
}

//生成验证码
@GetMapping("/code")
public void writeCode(HttpServletRequest request, HttpServletResponse response) {
  //生成验证码图片
  LineCaptcha lineCaptcha = CaptchaUtil.createLineCaptcha(250, 100,6,200);
  try {
    request.getSession().setAttribute("CAPTCHA_KEY", lineCaptcha.getCode());
    response.setContentType("image/png");//告诉浏览器输出内容为图片
    response.setHeader("Pragma", "No-cache");//禁止浏览器缓存
    response.setHeader("Cache-Control", "no-cache");
    response.setDateHeader("Expire", 0);
    lineCaptcha.write(response.getOutputStream());
    log.info("code={}",lineCaptcha.getCode());
  } catch (IOException e) {
    e.printStackTrace();
  }
}

//生成二维码
@GetMapping("/qrCode")
public void generateQrCode(HttpServletResponse response) {
  QrConfig config = new QrConfig(300, 300);
  // 高纠错级别
  config.setErrorCorrection(ErrorCorrectionLevel.H);
  // 设置边距，既二维码和背景之间的边距
  config.setMargin(3);
  // 设置前景色，既二维码颜色
  config.setForeColor(Color.WHITE.getRGB());
  // 设置背景色
  config.setBackColor(Color.BLACK.getRGB());    
  // 生成二维码到文件，写入流
  try {
    QrCodeUtil.generate("http://g5zdsc.natappfree.cc/hello/code", config, "jpg",response.getOutputStream());
  } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }
}