Reference address: https://www.cnblogs.com/manusas/p/6801436.html
package com.wfz.zxing;
import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.util.Hashtable;
import java.util.Map;
/**
* Created by Liang on 5/3/2017.
*/
public class ZxingUtils {
/**
* Generate QR code
*
* @param contents
* @param width
* @param height
* @param imgPath
*/
public void encodeQRCode(String contents, int width, int height, String imgPath) {
Map<EncodeHintType, Object> hints = new Hashtable<>();
// Specify the error correction level
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
// Specify the encoding format
hints.put(EncodeHintType.CHARACTER_SET, "GBK");
try { //To generate a QR code at the end of QR_CODE, pay attention to the greater the height and width of information, the denser the QR code
BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
BarcodeFormat.QR_CODE, width, height, hints);
MatrixToImageWriter.writeToStream(bitMatrix, "png",
new FileOutputStream(imgPath));
} catch (Exception e) {
e.printStackTrace ();
}
}
/**
* Parse QR code
*
* @param imgPath
* @return
*/
public String decodeQRCode(String imgPath) {
BufferedImage image = null;
Result result = null;
try {
image = ImageIO.read(new File(imgPath));
if (image == null) {
System.out.println("the decode image may be not exit.");
}
LuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Map<DecodeHintType, Object> hints = new Hashtable<>();
hints.put(DecodeHintType.CHARACTER_SET, "GBK");
result = new MultiFormatReader().decode(bitmap, hints);
return result.getText();
} catch (Exception e) {
e.printStackTrace ();
}
return null;
}
/**
* Generate barcode
*
* @param contents
* @param width
* @param height
* @param imgPath
*/
// int width = 105, height = 50; length is easy to report error: NotFoundException
public void encodeBarCode(String contents, int width, int height, String imgPath) {
int codeWidth = 3 + // start guard
(7 * 6) + // left bars
5 + // middle guard
(7 * 6) + // right bars
3; // end guard
codeWidth = Math.max(codeWidth, width);
try { //The barcode seems to only be able to write the information of the barcode fixed rules
BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
BarcodeFormat.EAN_13, codeWidth, height, null);
MatrixToImageWriter.writeToStream(bitMatrix, "png",
new FileOutputStream(imgPath));
} catch (Exception e) {
e.printStackTrace ();
}
}
/**
* Parse barcode
*
* @param imgPath
* @return
*/
public String decodeBarCode(String imgPath) {
BufferedImage image = null;
Result result = null;
try {
image = ImageIO.read(new File(imgPath));
if (image == null) {
System.out.println("the decode image may be not exit.");
}
LuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
/* Map<DecodeHintType, Object> hints = new Hashtable<>();
hints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
hints.put(DecodeHintType.CHARACTER_SET, "utf-8");
result = new MultiFormatReader().decode(bitmap, hints);*/
result = new MultiFormatReader().decode(bitmap, null);
return result.getText();
} catch (Exception e) {
e.printStackTrace ();
}
return null;
}
}
Test: Pay special attention to the height and width, and it is easy to report errors: NotFoundException
public static void main(String[] args) throws Exception {
String imgPath = "D:\\test.png";
// barcode of Yida sugar-free chewing gum
String contents = "6923450657713";
int width = 105, height = 50;
ZxingUtils handler = new ZxingUtils();
handler.encodeBarCode(contents, width, height, imgPath);
String barcode = handler.decodeBarCode(imgPath);
System.out.println(barcode);
handler.encodeQRCode("abc123中文@#\\", 200, 200, imgPath);
String qrcode = handler.decodeQRCode(imgPath);
System.out.println(qrcode);
}
The above is the reference information
This is my tool class important information
// Barcode encoding rule setting (character set)
Map<EncodeHintType, String> hints = new HashMap<EncodeHintType, String>();
hints.put(EncodeHintType.CHARACTER_SET, "GBK");
// barcode encoding
String info = strCode.toString(); //BarcodeFormat.PDF_417 This is encrypted barcode information
//info is the information you want to write codeWidh, codeHeight is the height and width
BitMatrix bm = new MultiFormatWriter().encode(info, BarcodeFormat.QR_CODE, codeWidth,
codeHeight, hints);
bm = deleteWhite(bm);// remove white border
ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
// output barcode to file stream
MatrixToImageWriter.writeToStream(bm, fileFormat, bos);
byte[] buffer = bos.toByteArray();
// Directly output the file stream to the page image tag (requires Base64 encoding)
return ("data:image/png;base64," + (Base64.getEncoder()).encodeToString(buffer));
After passing the ajax request, after transcoding the image information through base64, the required binary code is generated, and the image information can be displayed after passing in <img src=""> src
Note: Barcode information rules should be noted;