二维码的生成

Controller

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@RequestMapping(value = "/w/matrix/{userId}", method = RequestMethod.GET)
public void getMatrix(@PathVariable("userId")String userId,HttpServletRequest request, HttpServletResponse response) throws IOException, WriterException {
List<JwwUser> jwwUsers=jwwUserService.findJwwUserByUserName(userId);
//二维码外的大图
String p = request.getSession().getServletContext().getRealPath("/") + "/images/matrix.jpg";
//二维码内的小图标
String p1 = request.getSession().getServletContext().getRealPath("/") + "/images/logoa.jpg";
//二维码的内容
String content = "http://i.jinvovo.com/w/bannershow?refereeUserName="+userId;
//引用生成方法
BufferedImage image = RenderImage.genBarcode(content, 210, 210, p1);
//字符串在大图上的坐标
int width = 90;
int height = 283;
//颜色
Color color =new Color(232,183, 6);

response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "No-cache");
response.setDateHeader("Expires", 0);
// 指定生成的响应是图片
response.setContentType("image/jpeg");

File file = new File(p);
BufferedImage image1 = ImageIO.read(file);
Graphics g = image1.getGraphics();
//二维码坐标
g.drawImage(image, 10, 55, null);
g.setFont(new Font("SansSerif", 1, 20));
g.setColor(color);//设置颜色
userId=userId.substring(0,3)+"****"+userId.substring(userId.length()-4);
g.drawString(userId,width,height);

//姓名
String realName=jwwUsers.get(0).getRealname();
if(!"".equals(realName)&&realName!=null){
g.setFont(new Font("宋体", Font.PLAIN, 20));
String realName1=new String(realName.getBytes("utf-8"),"utf-8");
g.setColor(new Color(0,0,0));
g.drawString(realName1,20,280);
}
try {
ImageIO.write(image1, "JPEG", response.getOutputStream());
} catch (Exception e) {
e.printStackTrace();
}
}

生成二维码的方法

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参考  http://blog.csdn.net/lcx46/article/details/13626841
private static final int IMAGE_WIDTH = 30;
private static final int IMAGE_HEIGHT = 30;
private static final int IMAGE_HALF_WIDTH = IMAGE_WIDTH / 2;
private static final int FRAME_WIDTH = 0;

// 二维码写码器
private static MultiFormatWriter mutiWriter = new MultiFormatWriter();


/**
* 得到BufferedImage
*
* @param content
* 二维码显示的文本
* @param width
* 二维码的宽度
* @param height
* 二维码的高度
* @param srcImagePath
* 中间嵌套的图片
* @return
* @throws WriterException
* @throws java.io.IOException
*/
public static BufferedImage genBarcode(String content, int width,
int height, String srcImagePath) throws WriterException,
IOException {
// 读取源图像
BufferedImage scaleImage = scale(srcImagePath, IMAGE_WIDTH,
IMAGE_HEIGHT, false);

int[][] srcPixels = new int[IMAGE_WIDTH][IMAGE_HEIGHT];
for (int i = 0; i < scaleImage.getWidth(); i++) {
for (int j = 0; j < scaleImage.getHeight(); j++) {
srcPixels[i][j] = scaleImage.getRGB(i, j);
}
}

java.util.Hashtable hint = new java.util.Hashtable();
hint.put(EncodeHintType.CHARACTER_SET, "utf-8");
hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
// 生成二维码
BitMatrix matrix = mutiWriter.encode(content, BarcodeFormat.QR_CODE,
width, height, hint);

// 二维矩阵转为一维像素数组
int halfW = matrix.getWidth() / 2;
int halfH = matrix.getHeight() / 2;
int[] pixels = new int[width * height];

// System.out.println(matrix.getHeight());
for (int y = 0; y < matrix.getHeight(); y++) {
for (int x = 0; x < matrix.getWidth(); x++) {
// 读取图片
if (x > halfW - IMAGE_HALF_WIDTH
&& x < halfW + IMAGE_HALF_WIDTH
&& y > halfH - IMAGE_HALF_WIDTH
&& y < halfH + IMAGE_HALF_WIDTH) {
pixels[y * width + x] = srcPixels[x - halfW
+ IMAGE_HALF_WIDTH][y - halfH + IMAGE_HALF_WIDTH];
}
// 在图片四周形成边框
else if ((x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
&& x < halfW - IMAGE_HALF_WIDTH + FRAME_WIDTH
&& y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
+ IMAGE_HALF_WIDTH + FRAME_WIDTH)
|| (x > halfW + IMAGE_HALF_WIDTH - FRAME_WIDTH
&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
&& y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
+ IMAGE_HALF_WIDTH + FRAME_WIDTH)
|| (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
&& y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
- IMAGE_HALF_WIDTH + FRAME_WIDTH)
|| (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
&& y > halfH + IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
+ IMAGE_HALF_WIDTH + FRAME_WIDTH)) {
pixels[y * width + x] = 0xfffffff;
} else {
// 此处可以修改二维码的颜色,可以分别制定二维码和背景的颜色;
pixels[y * width + x] = matrix.get(x, y) ? 0xff000000
: 0xfffffff;
}
}
}

BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
image.getRaster().setDataElements(0, 0, width, height, pixels);

return image;
}

缩放图片的方法

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/**
* 把传入的原始图像按高度和宽度进行缩放,生成符合要求的图标
*
* @param srcImageFile
* 源文件地址
* @param height
* 目标高度
* @param width
* 目标宽度
* @param hasFiller
* 比例不对时是否需要补白:true为补白; false为不补白;
* @throws java.io.IOException
*/
private static BufferedImage scale(String srcImageFile, int height,
int width, boolean hasFiller) throws IOException {
double ratio = 1.0; // 缩放比例
File file = new File(srcImageFile);
BufferedImage srcImage = ImageIO.read(file);
Image destImage = srcImage.getScaledInstance(width, height,
BufferedImage.SCALE_SMOOTH);
// 计算比例
if ((srcImage.getHeight() > height) || (srcImage.getWidth() > width)) {
if (srcImage.getHeight() > srcImage.getWidth()) {
ratio = (new Integer(height)).doubleValue()
/ srcImage.getHeight();
} else {
ratio = (new Integer(width)).doubleValue()
/ srcImage.getWidth();
}
AffineTransformOp op = new AffineTransformOp(AffineTransform
.getScaleInstance(ratio, ratio), null);
destImage = op.filter(srcImage, null);
}
if (hasFiller) {// 补白
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D graphic = image.createGraphics();
graphic.setColor(Color.white);
graphic.fillRect(0, 0, width, height);
if (width == destImage.getWidth(null))
graphic.drawImage(destImage, 0, (height - destImage
.getHeight(null)) / 2, destImage.getWidth(null),
destImage.getHeight(null), Color.white, null);
else
graphic.drawImage(destImage,
(width - destImage.getWidth(null)) / 2, 0, destImage
.getWidth(null), destImage.getHeight(null),
Color.white, null);
graphic.dispose();
destImage = image;
}
return (BufferedImage) destImage;
}