java QRCode生成示例
原文链接:http://www.javaarch.net/jiagoushi/708.htm
java QRCode生成示例 我们可以使用QRGen这个比较不错的包来生成QR code。 maven依赖: <dependencies> <dependency> <groupId>net.glxn</groupId> <artifactId>qrgen</artifactId> <version>1.2</version> </dependency> </dependencies> 示例代码: import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import net.glxn.qrgen.QRCode; import net.glxn.qrgen.image.ImageType; public class QRCodeUtil { public static void main(String[] args) { ByteArrayOutputStream out = QRCode.from("Hello World") .to(ImageType.PNG).stream(); try { FileOutputStream fout = new FileOutputStream(new File( "E:\\logs\\QR_Code.JPG")); fout.write(out.toByteArray()); fout.flush(); fout.close(); } catch (FileNotFoundException e) { // Do Logging } catch (IOException e) { // Do Logging } // get QR file from text using defaults File file = QRCode.from("Hello World").file(); // get QR stream from text using defaults ByteArrayOutputStream stream = QRCode.from("Hello World").stream(); // override the image type to be JPG QRCode.from("Hello World").to(ImageType.JPG).file(); QRCode.from("Hello World").to(ImageType.JPG).stream(); // override image size to be 250x250 QRCode.from("Hello World").withSize(250, 250).file(); QRCode.from("Hello World").withSize(250, 250).stream(); // override size and image type QRCode.from("Hello World").to(ImageType.GIF).withSize(250, 250).file(); QRCode.from("Hello World").to(ImageType.GIF).withSize(250, 250).stream(); // Website Link (URLs) QR Code in Java ByteArrayOutputStream out1 = QRCode.from("http://viralpatel.net") .to(ImageType.PNG).stream(); } } j2ee中的使用: index.jsp <html> <head> <title>QR Code in Java Servlet - viralpatel.net</title> </head> <body> <form action="qrservlet" method="get"> <p>Enter Text to create QR Code</p> <input type="text" name="qrtext" /> <input type="submit" value="Generate QR Code" /> </form> </body> </html> QRCodeServlet.java import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.glxn.qrgen.QRCode; import net.glxn.qrgen.image.ImageType; public class QRCodeServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String qrtext = request.getParameter("qrtext"); ByteArrayOutputStream out = QRCode.from(qrtext).to( ImageType.PNG).stream(); response.setContentType("image/png"); response.setContentLength(out.size()); OutputStream outStream = response.getOutputStream(); outStream.write(out.toByteArray()); outStream.flush(); outStream.close(); } } web.xml <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>QR_Code_Servlet</display-name> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>QRCodeServlet</servlet-name> <servlet-class>net.viralpatel.qrcodes.QRCodeServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>QRCodeServlet</servlet-name> <url-pattern>/qrservlet</url-pattern> </servlet-mapping> </web-app> 可以查看:http://www.javaarch.net/jiagoushi/qrcode.htm