SQrCodeUtil.kt 5.1 KB

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  1. /*
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  19. * .:R888888I
  20. * .&888888I Copyright (c) 2016-2020. 博锐尚格科技股份有限公司
  21. * ~8888'
  22. * .!88~ All rights reserved.
  23. *
  24. * *********************************************************************************************************************
  25. */
  26. package com.persagy.service.utils
  27. import com.google.zxing.BarcodeFormat
  28. import com.google.zxing.EncodeHintType
  29. import com.google.zxing.WriterException
  30. import com.google.zxing.qrcode.QRCodeWriter
  31. import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel
  32. import java.awt.image.BufferedImage
  33. import java.io.IOException
  34. import java.util.*
  35. import javax.imageio.ImageIO
  36. import javax.servlet.ServletOutputStream
  37. import javax.servlet.http.HttpServletResponse
  38. /**
  39. * 二维码生成工具
  40. *
  41. * @author 庞利祥 <sybotan@126.com>
  42. */
  43. object SQrCodeUtil {
  44. var bgColor = 0xFFFFFF
  45. var pixelColor = 0x0
  46. /**
  47. * 生成并返回二维码到 Web 客户端
  48. *
  49. * @param response web 请求应答体
  50. * @param contents 二维码存储的内容
  51. * @param size 二维码大小
  52. * @param logo 二维码中间的 logo 图像
  53. * @return 二维码图像
  54. */
  55. fun outQrCode(response: HttpServletResponse, contents: String, size: Int, logo: BufferedImage? = null) {
  56. val buffImg = createQrCode(contents, size, logo)
  57. /** 禁止图像缓存 */
  58. response.setHeader("Pragma", "no-cache")
  59. response.setHeader("Cache-Control", "no-cache")
  60. response.setDateHeader("Expires", 0)
  61. response.contentType = "image/jpeg"
  62. /** 将图像输出到Servlet输出流中 */
  63. val sos: ServletOutputStream
  64. try {
  65. sos = response.outputStream
  66. ImageIO.write(buffImg, "jpeg", sos)
  67. sos.close()
  68. } catch (e: IOException) {
  69. e.printStackTrace()
  70. }
  71. return
  72. }
  73. /**
  74. * 创建二维码图像
  75. *
  76. * @param contents 二维码存储的内容
  77. * @param size 二维码大小
  78. * @return 二维码图像
  79. */
  80. fun createQrCode(contents: String, size: Int, logo: BufferedImage? = null): BufferedImage? {
  81. try {
  82. val hints = Hashtable<EncodeHintType, Any>()
  83. hints[EncodeHintType.CHARACTER_SET] = "utf-8"
  84. hints[EncodeHintType.ERROR_CORRECTION] = ErrorCorrectionLevel.L
  85. val matrix = QRCodeWriter().encode(contents, BarcodeFormat.QR_CODE, size, size, hints)
  86. var image = BufferedImage(size, size, BufferedImage.TYPE_INT_RGB)
  87. for (y in 0 until size) {
  88. for (x in 0 until size) {
  89. if (matrix.get(x, y)) {
  90. image.setRGB(x, y, pixelColor)
  91. } else {
  92. image.setRGB(x, y, bgColor)
  93. }
  94. }
  95. }
  96. if (null != logo) {
  97. image = addLogo(image, logo)
  98. }
  99. return image
  100. } catch (e: WriterException) {
  101. e.printStackTrace()
  102. }
  103. return null
  104. }
  105. /**
  106. * 为二维码图片增加 Logo
  107. *
  108. * @param src 二维码图片
  109. * @param logo Logol 图片
  110. * @return 添加过 Logo 的二维码图片
  111. */
  112. private fun addLogo(src: BufferedImage, logo: BufferedImage): BufferedImage {
  113. val srcWidth = src.width
  114. val srcHeight = src.height
  115. val logoWidth = logo.width
  116. val logoHeight = logo.height
  117. val image = BufferedImage(srcWidth, srcHeight, BufferedImage.TYPE_4BYTE_ABGR)
  118. val gd = image.createGraphics()
  119. gd.drawImage(src,0,0, null)
  120. gd.drawImage(logo,srcWidth * 2 / 5, srcHeight * 2 / 5, srcWidth * 3 / 5, srcHeight / 5, null)
  121. return image
  122. }
  123. }