java 生成二维码实例

java 生成二维码实例

最近有点时间想学点东西，想做个简单的系统，现在登录的时候使用扫描二维码获取验证码登录，于是就有了下面的一些代码

首先要导入pom依赖

com.google.zxing

core

3.3.0

这个是goole提供的一些包

第一个类是goole提供帮主类 画出图片

package com.cmbchina.ccd.itpm.baffle.util;

import java.awt.Graphics2D;

import java.awt.geom.AffineTransform;

import java.awt.image.BufferedImage;

import com.google.zxing.LuminanceSource;

public class BufferedImageLuminanceSource extends LuminanceSource {

private final BufferedImage image;

private final int left;

private final int top;

public BufferedImageLuminanceSource(BufferedImage image) {

this(image, 0, 0, image.getWidth(), image.getHeight());

}

public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {

super(width, height);

int sourceWidth = image.getWidth();

int sourceHeight = image.getHeight();

if (left + width > sourceWidth || top + height > sourceHeight) {

throw new IllegalArgumentException("Crop rectangle does not fit within image data.");

}

for (int y = top; y < top + height; y++) {

for (int x = left; x < left + width; x++) {

if ((image.getRGB(x, y) & 0xFF000000) == 0) {

image.setRGB(x, y, 0xFFFFFFFF); // = white

}

}

}

this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);

this.image.getGraphics().drawImage(image, 0, 0, null);

this.left = left;

this.top = top;

}

public byte[] getRow(int y, byte[] row) {

if (y < 0 || y >= getHeight()) {

throw new IllegalArgumentException("Requested row is outside the image: " + y);

}

int width = getWidth();

if (row == null || row.length < width) {

row = new byte[width];

}

image.getRaster().getDataElements(left, top + y, width, 1, row);

return row;

}

public byte[] getMatrix() {

int width = getWidth();

int height = getHeight();

int area = width * height;

byte[] matrix = new byte[area];

image.getRaster().getDataElements(left, top, width, height, matrix);

return matrix;

}

public boolean isCropSupported() {

return true;

}

public LuminanceSource crop(int left, int top, int width, int height) {

return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);

}

public boolean isRotateSupported() {

return true;

}

public LuminanceSource rotateCounterClockwise() {

int sourceWidth = image.getWidth();

int sourceHeight = image.getHeight();

AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);

BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);

Graphics2D g = rotatedImage.createGraphics();

g.drawImage(image, transform, null);

g.dispose();

int width = getWidth();

return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);

}

}

生成图片工具类

package com.cmbchina.ccd.itpm.baffle.util;

import java.awt.BasicStroke;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.Shape;

import java.awt.geom.RoundRectangle2D;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.OutputStream;

import java.util.Hashtable;

import java.util.Random;

import javax.imageio.ImageIO;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.google.zxing.BarcodeFormat;

import com.google.zxing.BinaryBitmap;

import com.google.zxing.DecodeHintType;

import com.google.zxing.EncodeHintType;

import com.google.zxing.MultiFormatReader;

import com.google.zxing.MultiFormatWriter;

import com.google.zxing.Result;

import com.google.zxing.common.BitMatrix;

import com.google.zxing.common.HybridBinarizer;

import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class QRCodeUtil {

private static final String CHARSET = "utf-8";

private static final String FORMAT_NAME = "JPG";

// 二维码尺寸

private static final int QRCODE_SIZE = 300;

// LOGO宽度

private static final int WIDTH = 60;

// LOGO高度

private static final int HEIGHT = 60;

private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {

Hashtable hints = new Hashtable();

hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

hints.put(EncodeHintType.CHARACTER_SET, CHARSET);

hints.put(EncodeHintType.MARGIN, 1);

BitMatrix bitMatrix =

new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);

int width = bitMatrix.getWidth();

int height = bitMatrix.getHeight();

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

for (int x = 0; x < width; x++) {

for (int y = 0; y < height; y++) {

image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);

}

}

if (imgPath == null || "".equals(imgPath)) {

return image;

}

// 插入图片

QRCodeUhttp://til.insertImage(image, imgPath, needCompress);

return image;

}

private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {

File file = new File(imgPath);

if (!file.exists()) {

System.err.println("" + imgPath + " 该文件不存在！");

return;

}

Image src = ImageIO.read(new File(imgPath));

int width = src.getWidth(null);

int height = src.getHeight(null);

if (needCompress) { // 压缩LOGO

if (width > WIDTH) {

width = WIDTH;

}

if (height > HEIGHT) {

height = HEIGHT;

}

Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);

BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics g = tag.getGraphics();

g.drawImage(image, 0, 0, null); // 绘制缩小后的图

g.dispose();

src = image;

}

// 插入LOGO

Graphics2D graph = source.createGraphics();

int x = (QRCODE_SIZE - width) / 2;

int y = (QRCODE_SIZE - height) / 2;

graph.drawImage(src, x, y, width, height, null);

Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);

graph.setStroke(new BasicStroke(3f));

graph.draw(shape);

graph.dispose();

}

/**

* @param content 编码到二维码中的内容

epHWMOY* @param imgPath 要嵌入二维码的图片路径，如果不写或者为null则生成一个没有嵌入图片的纯净的二维码

* @param destPath 生成的二维码的存放路径

* @param needCompress true：表示将嵌入二维码的图片进行压缩，如果为“false”则表示不压缩

* @param request

* @param response 设置图片返回前端展示

* @throws Exception

*/

public static void encode(String content, String imgPath, String destPath, boolean needCompress,

HttpServletRequest request, HttpServletResponse response) throws Exception {

BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);

mkdirs(destPath);

// String file = new Random().nextInt(99999999)+".jpg";

// ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));

ImageIO.write(image, FORMAT_NAME, new File(destPath));

response.setContentType("image/jpeg");

// 设置响应头控制浏览器不要缓存

response.setDateHeader("expries", -1);

response.setHeader("Cache-Control", "no-cache");

response.setHeader("Pragma", "no-cache");

ImageIO.write(image, FORMAT_NAME, response.getOutputStream());

}

public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {

BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);

return image;

}

public static void mkdirs(String destPath) {

File file = new File(destPath);

// 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)

if (!file.exists() && !file.isDirectory()) {

file.mkdirs();

}

}

public static void encode(String content, String imgPath, String destPath) throws Exception {

QRCodeUtil.encode(content, imgPath, destPath, false);

}

// 被注释的方法

/*

* public static void encode(String content, String destPath, boolean

* needCompress) throws Exception { QRCodeUtil.encode(content, null, destPath,

* needCompress); }

*/

public static void encode(http://String content, String destPath) throws Exception {

QRCodeUtil.encode(content, null, destPath, false);

}

public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)

throws Exception {

BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);

ImageIO.write(image, FORMAT_NAME, output);

}

public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {

BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);

mkdirs(destPath);

// String file = new Random().nextInt(99999999)+".jpg";

// ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));

ImageIO.write(image, FORMAT_NAME, new File(destPath));

}

public static void encode(String content, OutputStream output) throws Exception {

QRCodeUtil.encode(content, null, output, false);

}

public static String decode(File file) throws Exception {

BufferedImage image;

image = ImageIO.read(file);

if (image == null) {

return null;

}

BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);

BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

Result result;

Hashtable hints = new Hashtable();

hints.put(DecodeHintType.CHARACTER_SET, CHARSET);

result = new MultiFormatReader().decode(bitmap, hints);

String resultStr = result.getText();

return resultStr;

}

public static String decode(String path) throws Exception {

return QRCodeUtil.decode(new File(path));

}

}

controller

package com.cmbchina.ccd.itpm.baffle.controller;

import com.cmbchina.ccd.itpm.baffle.util.QRCodeUtil;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.util.Random;http://

/**

* @Author zly

* @Date 2020/6/24 15:54

*/

@RestController

@RequestMapping("image")

public class ImageController {

@GetMapping("getImage")

public void getImage(HttpServletRequest request, HttpServletResponse response) throws Exception {

String text = "http://101.132.36.16";

// 嵌入二维码的图片路径

String imgPath = "F:/qrCode/Koala.jpg";

// 生成的二维码的路径及名称

String destPath = "F:/qrCode/qrcode/jam.jpg";

//这里可以根据业务逻辑产生二维码内容 这里我是使用随机数1000-9999

int i = (int) (Math.random() * 9000 + 1000);

//生成二维码并返回前端

QRCodeUtil.encode("" + i, imgPath, destPath, true, request, response);

}

}

二维码示例

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