單元測試版:
導入jar包:
鏈接:https://pan.baidu.com/s/1qR4Mh0pwBAhpzx5gqCXDHg
提取碼:a1qa
導入里面的zxing3.2.1.jar包
Java代碼:
package ewm.test;
import java.io.File;
import java.nio.file.Path;
import java.util.HashMap;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
public class Demo {
public static void main(String[] args) {
if (orCode("https://www.ak1ak1.com/catalog.html", "F:\\1.jpg")) {
System.out.println("ok,成功");
} else {
System.out.println("no,失敗");
}
}
private static boolean orCode(String content, String path) {
/*
* 圖片的寬度和高度
*/
int width = 300;
int height = 300;
// 圖片的格式
String format = "png";
// 二維碼內容
// String content = "hello,word";
// 定義二維碼的參數
HashMap hints = new HashMap();
// 定義字符集編碼格式
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
// 糾錯的等級 L > M > Q > H 糾錯的能力越高可存儲的越少,一般使用M
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
// 設置圖片邊距
hints.put(EncodeHintType.MARGIN, 2);
try {
// 最終生成 參數列表 (1.內容 2.格式 3.寬度 4.高度 5.二維碼參數)
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
// 寫入到本地
Path file = new File(path).toPath();
MatrixToImageWriter.writeToPath(bitMatrix, format, file);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
}
web版本:
導入maven依賴
<dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.3.3</version> <scope>compile</scope> </dependency> <dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>3.3.3</version> <scope>compile</scope> </dependency>
Java代碼:
public void dowanload(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response) throws Exception {
Project project = JSON.parseObject(JSONObject.toJSONString(getProject(id).getData(), true),Project.class);
//二維碼中包含的信息
String content = project.getPageUrl() + "&" + project.getProjectID();
Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
// 指定編碼格式
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
// 指定糾錯級別(L--7%,M--15%,Q--25%,H--30%)
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
// 編碼內容,編碼類型(這里指定為二維碼),生成圖片寬度,生成圖片高度,設置參數
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 200, 200, hints);
//設置請求頭
response.setHeader("Content-Type","application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename=" + project.getProjectID() + ".png");
OutputStream outputStream = response.getOutputStream();
MatrixToImageWriter.writeToStream(bitMatrix, "png", outputStream);
outputStream.flush();
outputStream.close();
}
