Java生成二维码  不信就扫一扫略缩图...  源码: Java_ImageCode

需要的jar: qrcode.jar和 qrcode_swetake.jar,以及一个工具类,下面有。

 

package com.sbm.wll.image;

 

/**

  • Java 生成二维码,解析二维码

*/

import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import javax.imageio.ImageIO;

import com.swetake.util.Qrcode;

import jp.sourceforge.qrcode.QRCodeDecoder;

import jp.sourceforge.qrcode.exception.DecodingFailedException;

public class Image {

/**

  • 生成二维码图片文件

  • @param content

*            存储内容

  • @param imgPath

*            图片路径

  • @param imgType

*            图片类型

  • @param size

*            二维码尺寸

*/

public void encoderQRCode(String content, String imgPath, String imgType, int size) {

try {

BufferedImage bufImg = this.qRCodeCommon(content, imgType, size);

File imgFile = new File(imgPath);

// 生成二维码QRCode图片

ImageIO.write(bufImg, imgType, imgFile);

System.out.println("二维码生成成功,路径:" + imgPath);

} catch (Exception e) {

e.printStackTrace();

}

}

 

/**

  • 生成二维码,流输出

*/

public void encoderQRCode(String content, OutputStream output, String imgType, int size) {

try {

BufferedImage bufImg = this.qRCodeCommon(content, imgType, size);

// 生成二维码QRCode图片

ImageIO.write(bufImg, imgType, output);

System.out.println("二维码生成成功,流输出");

} catch (Exception e) {

e.printStackTrace();

}

}

/**

  • 生成二维码(QRCode)图片的基本方法

*/

private BufferedImage qRCodeCommon(String content, String imgType, int size) {

BufferedImage bufImg = null;

try {

Qrcode qrcodeHandler = new Qrcode();

// 设置二维码排错率,可选L(7%)、M(15%)、Q(25%)、H(30%),排错率越高可存储的信息越少,但对二维码清晰度的要求越小

qrcodeHandler.setQrcodeErrorCorrect('M');

qrcodeHandler.setQrcodeEncodeMode('B');

// 设置设置二维码尺寸,取值范围1-40,值越大尺寸越大,可存储的信息越大

qrcodeHandler.setQrcodeVersion(size);

// 获得内容的字节数组,设置编码格式

byte[] contentBytes = content.getBytes("utf-8");

// 图片尺寸

int imgSize = 67 + 12 * (size - 1);

bufImg = new BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB);

Graphics2D gs = bufImg.createGraphics();

// 设置背景颜色

gs.setBackground(Color.WHITE);

gs.clearRect(0, 0, imgSize, imgSize);

// 设定图像颜色> BLACK

gs.setColor(Color.BLACK);

// 设置偏移量,不设置可能导致解析出错

int pixoff = 2;

// 输出内容> 二维码

if (contentBytes.length > 0 && contentBytes.length < 800) {

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);

}

}

}

} else {

throw new Exception("二维码长度 为" + contentBytes.length + " 大于:800.生成失败");

}

gs.dispose();

bufImg.flush();

} catch (Exception e) {

e.printStackTrace();

}

return bufImg;

}

/**

  • 解析二维码(QRCode)图片类型

*/

public String decoderQRCode(String imgPath) {

// QRCode 二维码图片的文件

File imageFile = new File(imgPath);

BufferedImage bufImg = null;

String content = null;

try {

bufImg = ImageIO.read(imageFile);

QRCodeDecoder decoder = new QRCodeDecoder();

content = new String(decoder.decode(new TwoDimensionCodeImage(bufImg)), "utf-8");

} catch (IOException e) {

System.out.println("Error: " + e.getMessage());

e.printStackTrace();

} catch (DecodingFailedException dfe) {

System.out.println("Error: " + dfe.getMessage());

dfe.printStackTrace();

}

return content;

}

/**

  • 解析二维码(QRCode),输入流类型

 

*/

public String decoderQRCode(InputStream input) {

BufferedImage bufImg = null;

String content = null;

try {

bufImg = ImageIO.read(input);

QRCodeDecoder decoder = new QRCodeDecoder();

content = new String(decoder.decode(new TwoDimensionCodeImage(bufImg)), "utf-8");

} catch (IOException e) {

System.out.println("Error: " + e.getMessage());

e.printStackTrace();

} catch (DecodingFailedException dfe) {

System.out.println("Error: " + dfe.getMessage());

dfe.printStackTrace();

}

return content;

}

@org.junit.Test

public void Test() {

String imgPath = "D:/image.jpg";

String encoderContent = "Java是一门面向对象编程语言极好地实现了面向对象理论";

Image handler = new Image();

handler.encoderQRCode(encoderContent, imgPath, "jpg", 7);

System.out.println("生成 success");

String decoderContent = handler.decoderQRCode(imgPath);

System.out.println("解析结果如下:");

System.out.println(decoderContent);

}

}

下面是工具类:

package com.sbm.wll.image;

 

/**

  • 图片对象工具类

*/

import java.awt.image.BufferedImage;

import jp.sourceforge.qrcode.data.QRCodeImage;

public class TwoDimensionCodeImage implements QRCodeImage {

BufferedImage bufImg;

public TwoDimensionCodeImage(BufferedImage bufImg) {

this.bufImg = bufImg;

}

@Override

public int getHeight() {

return bufImg.getHeight();

}

@Override

public int getPixel(int x, int y) {

return bufImg.getRGB(x, y);

}

@Override

public int getWidth() {

return bufImg.getWidth();

}

}