前提需要依賴com.swetake.util.Qrcode。
public void doPost(HttpServletRequest request,HttpServletResponse response)
{
response.setContentType("image/jpeg");//設定相應類型,告訴浏覽器輸出的内容為圖檔
response.setHeader("Pragma", "No-cache");//設定響應頭資訊,告訴浏覽器不要緩存此内容
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expire", );
String content="http://www.baidu.com";
try {
Qrcode qrcodeHandler = new Qrcode();
// 設定二維碼排錯率,可選L(7%)、M(15%)、Q(25%)、H(30%),排錯率越高可存儲的資訊越少,但對二維碼清晰度的要求越小
qrcodeHandler.setQrcodeErrorCorrect('L');
qrcodeHandler.setQrcodeEncodeMode('B');
qrcodeHandler.setQrcodeVersion();
System.out.println(content);
// int imgSize = 67 + 12 * (size - 1);
byte[] contentBytes = content.getBytes("gb2312");
BufferedImage bufImg = new BufferedImage(, , BufferedImage.TYPE_INT_RGB);
Graphics2D gs = bufImg.createGraphics();
gs.setBackground(Color.WHITE);
gs.clearRect(, , , );
// 設定圖像顔色> BLACK
gs.setColor(Color.BLACK);
// 設定偏移量 不設定可能導緻解析出錯
int pixoff = ;
// 輸出内容> 二維碼
if (contentBytes.length > && contentBytes.length < ) {
boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);
for (int i = ; i < codeOut.length; i++) {
for (int j = ; j < codeOut.length; j++) {
if (codeOut[j][i]) {
gs.fillRect(j * + pixoff, i * + pixoff, , );
}
}
}
} else {
System.err.println("QRCode content bytes length = "
+ contentBytes.length + " not in [ 0,120 ]. ");
}
gs.dispose();
bufImg.flush();
// 生成二維碼QRCode圖檔
ImageIO.write(bufImg, "png", response.getOutputStream());
//create qrcode to file
File file=FileUtil.createTempFile("jpg");
ImageIO.write(bufImg, "png", file);
}catch (Exception e) {
// TODO: handle exception
}
return false;
} catch (Exception e) {
_log.error(e, e);
return true;
}
}