java QRCode生成示例 (二维码生成)

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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>

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