java代碼
package Utill;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import com.swetake.util.Qrcode;
public class QR {
public void encoderQRCoder(String content, HttpServletResponse response) {
try {
Qrcode qrcodeHandler = new Qrcode();
//設置二維碼排錯率,可選L(7%)、M(15%)、Q(25%)、H(30%),排錯率越高可存儲的信息越少,但對二維碼清晰度的要求越小
qrcodeHandler.setQrcodeErrorCorrect('M');
qrcodeHandler.setQrcodeEncodeMode('B');
// 設置設置二維碼尺寸,取值範圍1-40,值越大尺寸越大,可存儲的信息越大
qrcodeHandler.setQrcodeVersion(7);
// 獲得內容的字節數組,設置編碼格式
byte[] contentBytes = content.getBytes("utf-8");
//構造一個BufferedImage對象 設置寬、高
BufferedImage bufImg = new BufferedImage(140, 140, BufferedImage.TYPE_INT_RGB);
Graphics2D gs = bufImg.createGraphics();
gs.setBackground(Color.WHITE);
gs.clearRect(0, 0, 140, 140);
// 設定圖像顏色 BLACK
gs.setColor(Color.BLACK);
// 設置偏移量 不設置可能導致解析出錯
int pixoff = 2;
// 輸出內容 二維碼
if (contentBytes.length > 0 && contentBytes.length < 120) {
boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);
for (int i = 0; i < codeOut.length; i++) {
for (int j = 0; j < codeOut.length; j++) {
if (codeOut[j][i]) {
gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
}
}
}
System.out.println("生成成功");
} else {
System.err.println("QRCode content bytes length = "+ contentBytes.length + " not in [ 0,120 ]. ");
}
//實例化一個Image對象。
ImageIO.write(bufImg, "jpg", response.getOutputStream());
}catch (Exception e){
e.printStackTrace();
}
}
}
servlet代碼
package snippet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import domain.URL;
import Utill.QR;
public class testQR extends HttpServlet {
static String content;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
QR encoder = new QR();
encoder.encoderQRCoder(content, response);
}
}