图片生成工具生成
1.支持多中形式的图片，二维码，条形码
2.支持一张图片多个二维码
3.支持二维码图片上加logo
4.支持图片头部底部添加文字描述
public class ZxingEncoderUtil {
private static final String CHARSET = "utf-8";
private static final String FORMAT = "JPG";
private static Font font = null;
/**
* 二维码生成，支持一张图上多个二维码，支持图片添加字体(上下位置)，支持二维码中间加logo,
*
* @param content
* @param qrWidth
* @param qrHeight
* @param barcodeFormat
* @param logoPath
* @param multiImgs
* @param options key image_top_1 *** 表示图片要加的内容
* @return
*/
public static byte[] createImage(String content, int qrWidth, int qrHeight, BarcodeFormat barcodeFormat, String logoPath, Boolean multiImgs, Map<String, String> options) {
//每个图片之间的间隔
int gap = 0;
//每行的行距
int lineHeight = 0;
//字符串的高度
int strHeight = 15;
List<String> contents = new ArrayList<>();
try {
HashMap<EncodeHintType, Object> hints = new HashMap<>();
if (StringUtils.isNotBlank(logoPath)) {
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); //容错等级 L、M、Q、H 其中 L 为最低, H 为最高
} else {
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M); //容错等级 L、M、Q、H 其中 L 为最低, H 为最高
}
hints.put(EncodeHintType.CHARACTER_SET, CHARSET); // 字符编码
hints.put(EncodeHintType.MARGIN, 0); // 二维码与图片边距
if (multiImgs != null && multiImgs) {
String[] str = content.split(",");
contents = Arrays.asList(str);
gap = 15;
} else {
contents.add(content);
}
//去重
ArrayList<String> result = new ArrayList<>();
for (String item : contents) {
if (Collections.frequency(result, item) < 1) result.add(item);
}
Map<String, SortedMap<String, String>> addImage = addOnImage(options);
SortedMap<String, String> topMap = addImage.get("top");
SortedMap<String, String> bottomMap = addImage.get("bottom");
//行距
if (topMap != null && !topMap.isEmpty() || bottomMap != null && !bottomMap.isEmpty()) {
lineHeight = 5;
}
//画布的宽,高
int bWidth = qrWidth;
int bHeight = qrHeight + gap + lineHeight * 2;
//如果是条形码，需要增加源字符串在画布上
if (barcodeFormat.equals(BarcodeFormat.CODE_128)) {
bHeight += strHeight;
}
//如果要加头文字,需要加上头部的高度
if (topMap != null && !topMap.isEmpty()) {
bHeight += strHeight * topMap.size();
}
//如果要加上底部描述，需要加上底部高度
if (bottomMap != null && !bottomMap.isEmpty()) {
bHeight += strHeight * bottomMap.size();
}
//整个画布的高度
bHeight = bHeight * result.size() - gap;
//设置画布
BufferedImage source = new BufferedImage(bWidth, bHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D graph = source.createGraphics();
//设置背景颜色
graph.setBackground(Color.WHITE);
graph.clearRect(0, 0, bWidth, bHeight);
if (font == null) {
FileInputStream inputStream = new FileInputStream(new File(ZxingEncoderUtil.class.getResource("/font/msyh.ttf").getFile()));
font = Font.createFont(Font.TRUETYPE_FONT, inputStream).deriveFont(Font.BOLD, 14f);
inputStream.close();
}
graph.setFont(font);
graph.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
graph.setColor(Color.BLACK);
//下一次起始Y位置
int nextPosY = 0;
//汇总一次的高度
int singleHeight;
int topHeight;
for (String item : result) {
singleHeight = 0;
topHeight = 0;
BufferedImage image = printImage(item, barcodeFormat, qrWidth, qrHeight, logoPath, hints);
//画图片上部分
if (topMap != null && !topMap.isEmpty()) {
for (SortedMap.Entry<String, String> entry : topMap.entrySet()) {
int strWidth = graph.getFontMetrics().stringWidth(entry.getValue());
int strX = (image.getWidth(null) - strWidth) / 2;
int strY = strHeight * Integer.valueOf(entry.getKey()) + nextPosY;
graph.drawString(entry.getValue(), strX, strY);
}
topHeight = strHeight * topMap.size();
}
//图片坐标
int imageX = 0;
int imageY = topHeight + lineHeight + nextPosY;
//画图片
graph.drawImage(image, imageX, imageY, image.getWidth(null), image.getHeight(null), null);
singleHeight += topHeight + lineHeight + image.getHeight(null);
if (barcodeFormat.equals(BarcodeFormat.CODE_128)) {
int strWidth = graph.getFontMetrics().stringWidth(item);
int strX = (image.getWidth(null) - strWidth) / 2;
int strY = imageY + strHeight + image.getHeight(null);
graph.drawString(item, strX, strY);
singleHeight += strHeight;
}
//画图片下部分
if (bottomMap != null && !bottomMap.isEmpty()) {
for (SortedMap.Entry<String, String> entry : bottomMap.entrySet()) {
int strWidth = graph.getFontMetrics().stringWidth(entry.getValue());
int strX = (image.getWidth(null) - strWidth) / 2;
int strY = strHeight * Integer.valueOf(entry.getKey()) + nextPosY + singleHeight;
graph.drawString(entry.getValue(), strX, strY);
}
singleHeight += strHeight * bottomMap.size();
}
//设置下次画图的位置
int i = result.indexOf(item);
nextPosY = (singleHeight + gap) * (i + 1);
}
graph.setStroke(new BasicStroke(3f));
graph.dispose();
return imageIO(source);
} catch (Exception e) {
}
return null;
}
/**
* BufferedImage 转字节流
*
* @param source
* @return
*/
private static byte[] imageIO(BufferedImage source) {
try {
ByteArrayOutputStream os = new ByteArrayOutputStream();
ImageIO.write(source, "jpg", os);
return os.toByteArray();
} catch (Exception ex) {
return null;
}
}
/**
* 插入LOGO
*
* @param source
* @param logoPath
* @throws Exception
*/
private static void insertImage(BufferedImage source, String logoPath) throws Exception {
File file = new File(ZxingEncoderUtil.class.getResource(String.format("/image/%s", logoPath)).getFile());
if (!file.exists()) {
throw new Exception("logo file not found.");
}
Image src = ImageIO.read(file);
int width = src.getWidth(null);
int height = src.getHeight(null);
// 插入LOGO
Graphics2D graph = source.createGraphics();
int x = (source.getWidth() - width) / 2;
int y = (source.getHeight() - height) / 2;
graph.drawImage(src, x, y, width, height, null);
Shape shape = new RoundRectangle2D.Float(x, y, width, height, 6, 6);
graph.setStroke(new BasicStroke(3f));
graph.draw(shape);
graph.dispose();
}
/**
* zxing工具生成BufferedImage
*
* @param content
* @param barcodeFormat
* @param qrWidth
* @param qrHeight
* @param logoPath
* @param hints
* @return
* @throws Exception
*/
private static BufferedImage printImage(String content, BarcodeFormat barcodeFormat, int qrWidth, int qrHeight, String logoPath, HashMap<EncodeHintType, Object> hints) throws Exception {
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, barcodeFormat, qrWidth, qrHeight, 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 (StringUtils.isNotBlank(logoPath)) {
insertImage(image, logoPath);
}
return image;
}
/**
* 获取位置参数
*
* @param options key image_AA_BB value *** AA位置（top,bottom） BB 排序
* @return
*/
private static Map<String, SortedMap<String, String>> addOnImage(Map<String, String> options) {
Map<String, SortedMap<String, String>> result = Collections.synchronizedMap(new HashMap<String, SortedMap<String, String>>());
SortedMap<String, String> topMap = Collections.synchronizedSortedMap(new TreeMap<String, String>());
SortedMap<String, String> bottomMap = Collections.synchronizedSortedMap(new TreeMap<String, String>());
try {
if (options != null && !options.isEmpty())
for (Map.Entry<String, String> entry : options.entrySet()) {
if (StringUtils.isNotBlank(entry.getValue())) {
//top
if (entry.getKey().startsWith("image_top")) {
topMap.put(entry.getKey().replace("image_top_", ""), entry.getValue());
}
//bottom
if (entry.getKey().startsWith("image_bottom")) {
bottomMap.put(entry.getKey().replace("image_bottom_", ""), entry.getValue());
}
ClogManager.info("内容", entry.getValue());
}
}
} catch (Exception e) {
}
result.put("top", topMap);
result.put("bottom", bottomMap);
return result;
}
}
在开发这个工具的途中遇到问题：在本地win系统上图片drawString时，中文显示正常，但是到linux系统时，中文就显示不出来，显示的是方框，造成这种问题是由于操作系统不支持中文字体导致，最终最佳的解决方案是，下载需要的字体，放根目录，通过读取文件的方式获得字体，
java.awt.Font类方法createFont获取文件的方式获得字体，从而改变drawString画中文不异常，此解决方案不必改动linux系统字体
时间： 2024-08-05 23:06:44