标签：style blog http color io os ar java for
QRCode.java程序
package my; import java.awt.Color; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.IOException; import java.io.UnsupportedEncodingException; import javax.imageio.ImageIO; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.swetake.util.Qrcode; public class QRCode extends HttpServlet{ //重写HttpServlet里面的service方法(请求对象，相应对象) public void service(HttpServletRequest request, HttpServletResponse response){ try { request.setCharacterEncoding("utf-8");//设置接收字符的编码 String content=request.getParameter("content");//得到文本框中的类容 Qrcode qrcode=new Qrcode();//创建Qrcode对象 qrcode.setQrcodeErrorCorrect(‘M‘);//设置排错率 L%7 M%15 Q%25 H%30 qrcode.setQrcodeEncodeMode(‘B‘);//设置编码 B为二维码 qrcode.setQrcodeVersion(7);//设置版本号1-40 //先以ISO-8859-1解码（默认编码），转化成UTF-8编码字符编码的转换 byte[] bt = new String(content.getBytes("ISO-8859-1"),"UTF-8").getBytes(); //创建图像数据的缓冲区 //BufferedImage.TYPE_INT_BGR 创建一个具有8位RGB颜色的分量图片 BufferedImage image = new BufferedImage(140,140,BufferedImage.TYPE_INT_BGR); //创建画笔工具 Graphics2D g2D = image.createGraphics(); //设置颜色 g2D.setBackground(Color.WHITE); //绘制矩形 g2D.clearRect(0, 0, 140, 140); //绘制前景色 g2D.setColor(Color.BLACK); if(bt.length > 0){ //返回二维码的数据 boolean[][] s = qrcode.calQrcode(bt); for(int i = 0; i < s.length; i++){ for(int j = 0; j < s.length; j++){ if(s[j][i]){ //布尔数组填充图片 g2D.fillRect(j * 3 + 2, i * 3 + 2, 3, 3); } } } } g2D.dispose();//释放画笔 image.flush();//残留数据推出缓冲区 //以流的方式将image二维码输出 ImageIO.write(image, "jpg", response.getOutputStream()); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
index.jsp
<%@ page language="java" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript">
function qrcode(){
var value=document.getElementById(‘content‘).value;
var image=document.getElementById(‘image‘);
image.src=‘qr.do?content=‘+value;
}
</script>
</head>
<body>
<input type="text" id="content" width=100px height= 100px/>
<input type="button" value="生成二维码" onclick="qrcode()"/>
<img id="image" />
</body>
</html>
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <!-- 定义一个servlet --> <servlet> <servlet-name>qrcode</servlet-name> <servlet-class>my.QRCode</servlet-class> </servlet> <servlet-mapping> <servlet-name>qrcode</servlet-name> <url-pattern>/qr.do</url-pattern> </servlet-mapping> </web-app>
标签：style blog http color io os ar java for
原文地址：http://www.cnblogs.com/lcpholdon/p/4021341.html
