java生成二维码（以及一维码）--------方法

现在贴出部分核心代码，在最后提供全部代码下载链接。有感兴趣的朋友，可以点击链接下载源代码

二维码，是一种采用黑白相间的平面几何图形通过相应的编码算法来记录文字、图片、网址等信息的条码图片。

如下图



一、Java

所需jar包：QRCode.jar

http://vdisk.weibo.com/

QRCode类：二维码操作核心类

package app.Code;

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 jp.sourceforge.qrcode.QRCodeDecoder;

import jp.sourceforge.qrcode.exception.DecodingFailedException;

import com.swetake.util.Qrcode;

public class QRCode {

public void encoderQRCode(String content, String imgPath) {

this.encoderQRCode(content, imgPath, "png", 7);

}

public void encoderQRCode(String content, OutputStream output) {

this.encoderQRCode(content, output, "png", 7);

}

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

this.encoderQRCode(content, imgPath, imgType, 7);

}

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

this.encoderQRCode(content, output, imgType, 7);

}

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);

} catch (Exception e) {

e.printStackTrace();

}

}

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);

} catch (Exception e) {

e.printStackTrace();

}

}

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("QRCode content bytes length = " + contentBytes.length + " not in [0, 800].");

}

gs.dispose();

bufImg.flush();

} catch (Exception e) {

e.printStackTrace();

}

return bufImg;

}

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 CodeImage(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;

}

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 CodeImage(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;

}

public static void main(String[] args) {

String imgPath = "F:/QRCode.png";

String encoderContent = "Hello,world!";

QRCode handler = new QRCode();

handler.encoderQRCode(encoderContent, imgPath, "png");

// try {

// OutputStream output = new FileOutputStream(imgPath);

// handler.encoderQRCode(content, output);

// } catch (Exception e) {

// e.printStackTrace();

// }

System.out.println("========风吹雨成花======");

String decoderContent = handler.decoderQRCode(imgPath);

System.out.println("解析结果如下：");

System.out.println(decoderContent);

System.out.println("========时间追不上白马=======");

}

}

===================================

CodeImage 类：二维码图片对象

package app.Code;

import java.awt.image.BufferedImage;

import jp.sourceforge.qrcode.data.QRCodeImage;

public class CodeImage implements QRCodeImage{

BufferedImage bufImg;

public CodeImage(BufferedImage bufferedImage){

this.bufImg=bufferedImage;

}

public int getHeight() {

// TODO Auto-generated method stub

return bufImg.getHeight();

}

public int getPixel(int x, int y) {

// TODO Auto-generated method stub

return bufImg.getRGB(x, y);

}

public int getWidth() {

// TODO Auto-generated method stub

return bufImg.getWidth();

}

}

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代码下载地址：实例代码下载链接
一维码生成可以参考：http://blog.csdn.net/cdl0405/article/details/5990545
二维码生成可以参考：http://blog.csdn.net/cdl0405/article/details/5990567