所需jar包：
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.1.0</version>
</dependency>
AI 代码解读
/**
*
* 实现说明：把服务器上的产品详情页的链接地址（含有ID）生成二维码，微信扫码，跳转到指定页
* 需要jar:zxing-code-3.1.0.jar
*
*/
public class GenerateCode {
private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;
public static void main(String[] args) {
try {
boolean flag = generateCode("518");
if (flag) {
System.out.println("成功生成二维码");
}
} catch (WriterException | IOException e) {
System.err.println("生成二维码失败");
e.printStackTrace();
}
}
public static boolean generateCode(String productId) throws WriterException, IOException {
// 这里是URL，扫描之后就跳转到这个界面
String text = "https://www.baidu.com/?uudi=" + productId;
String path = "E:/"; // 图片生成的位置
int width = 400;
int height = 400;
// 二维码图片格式
String format = "jpg";
// 设置编码，防止中文乱码
Hashtable<EncodeHintType, Object> ht = new Hashtable<EncodeHintType, Object>();
ht.put(EncodeHintType.CHARACTER_SET, "UTF-8");
// 设置二维码参数(编码内容，编码类型，图片宽度，图片高度,格式)
BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, ht);
// 生成二维码(定义二维码输出服务器路径)
File outputFile = new File(path);
if (!outputFile.exists()) {
// 创建文件夹
outputFile.mkdir();
}
int b_width = bitMatrix.getWidth();
int b_height = bitMatrix.getHeight();
// 建立图像缓冲器
BufferedImage image = new BufferedImage(b_width, b_height, BufferedImage.TYPE_3BYTE_BGR);
for (int x = 0; x < b_width; x++) {
for (int y = 0; y < b_height; y++) {
image.setRGB(x, y, bitMatrix.get(x, y) ? BLACK : WHITE);
}
}
// 生成二维码
ImageIO.write(image, format, new File(path + "/code." + format));
// 二维码的名称
// code.jpg
return true;
}
}
AI 代码解读
通过接口下载：
@Controller
public class GenerateCode {
private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;
@GetMapping("/download/{code}")
public void downloadCode(@PathVariable String code, HttpServletResponse response) throws WriterException, IOException {
// 这里是URL，扫描之后就跳转到这个界面
String text = "https://www.baidu.com/?intited=" + code;
int width = 400;
int height = 400;
// 二维码图片格式
String format = "jpg";
// 设置编码，防止中文乱码
Hashtable<EncodeHintType, Object> ht = new Hashtable<EncodeHintType, Object>();
ht.put(EncodeHintType.CHARACTER_SET, "UTF-8");
// 设置二维码参数(编码内容，编码类型，图片宽度，图片高度,格式)
BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, ht);
int b_width = bitMatrix.getWidth();
int b_height = bitMatrix.getHeight();
// 建立图像缓冲器
BufferedImage image = new BufferedImage(b_width, b_height, BufferedImage.TYPE_3BYTE_BGR);
for (int x = 0; x < b_width; x++) {
for (int y = 0; y < b_height; y++) {
image.setRGB(x, y, bitMatrix.get(x, y) ? BLACK : WHITE);
}
}
String fileName= new StringBuffer().append(code).append(".").append(format).toString();
response.setHeader("Content-Type","application/octet-stream");
response.setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(fileName, "UTF-8"));
response.setContentType("application/octet-stream; charset=utf-8");
// 生成二维码
ServletOutputStream fileOutputStream = response.getOutputStream();
ImageIO.write(image, format, fileOutputStream);
fileOutputStream.flush();
fileOutputStream.close();
}
}
AI 代码解读
或者这样也行
@Controller
public class GenerateCode {
private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;
@GetMapping("/download/{code}")
public void downloadCode(@PathVariable String code, HttpServletRequest request, HttpServletResponse response) throws WriterException, IOException {
// 这里是URL，扫描之后就跳转到这个界面
String text = "https://www.baidu.com/?intited=" + code;
int width = 400;
int height = 400;
// 二维码图片格式
String format = "jpg";
// 设置编码，防止中文乱码
Hashtable<EncodeHintType, Object> ht = new Hashtable<EncodeHintType, Object>();
ht.put(EncodeHintType.CHARACTER_SET, "UTF-8");
// 设置二维码参数(编码内容，编码类型，图片宽度，图片高度,格式)
BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, ht);
int b_width = bitMatrix.getWidth();
int b_height = bitMatrix.getHeight();
// 建立图像缓冲器
BufferedImage image = new BufferedImage(b_width, b_height, BufferedImage.TYPE_3BYTE_BGR);
for (int x = 0; x < b_width; x++) {
for (int y = 0; y < b_height; y++) {
image.setRGB(x, y, bitMatrix.get(x, y) ? BLACK : WHITE);
}
}
String fileName= new StringBuffer().append(code).append(".").append(format).toString();
// 设置下载文件的mineType，告诉浏览器下载文件类型
String mineType = request.getServletContext().getMimeType(fileName);
System.out.println(mineType);
response.setContentType(mineType);
response.setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(fileName, "UTF-8"));
// 生成二维码
ServletOutputStream fileOutputStream = response.getOutputStream();
ImageIO.write(image, format, fileOutputStream);
fileOutputStream.flush();
fileOutputStream.close();
}
}
AI 代码解读
