qrcode二维码学习笔记之二
原地址： http://kantaotao.blog.163.com/blog/static/9468786200972745646902/qrcode二维码学习笔记之二
二维码 2009-08-27 16:56:46 阅读157 评论1 字号：大中小
<div class="bct fc05 fc11 nbw-blog ztag js-fs2">
在Servlet中生成qrcode图片
//设置响应头信息
String encode = "jpeg";
response.setContentType("image/".concat(String.valueOf(String
.valueOf(encode))));
javax.servlet.ServletOutputStream outb = response.getOutputStream();
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
//从请求中读取内容
InputStream input = request.getInputStream();
DataInputStream dinput = new DataInputStream(input);
String str = "";
try {
str = dinput.readUTF();
} catch (Exception e) {
}
if ("".equals(str)) {
str = "0";
}
System.out.println("str:" + str);
//以下是测试数据
EnQRCode barCode = QrCodeUtils.enqrcode(TestDBUtils.getDBString(str), 2);
BufferedImage BarImage = new BufferedImage(barCode.getSize().width,
barCode.getSize().height, 1);
Graphics2D BarGraphics = BarImage.createGraphics();
barCode.paint(BarGraphics);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(outb);
encoder.encode(BarImage);
使用J2ME客户端生成图片信息
HttpConnection conn = (HttpConnection) Connector.open(“http://127.0.0.1/QrcodeDemo/do”,
Connector.READ_WRITE, true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "close");
conn.setRequestProperty("Content-Type", "application/octet-stream");
int sendlength = str.getBytes().length;
conn.setRequestProperty("Content-Length", String.valueOf(sendlength));
//打开流对象 并输入测试数据
os = conn.openDataOutputStream();
os.writeUTF("测试");
//获取服务器返回消息
is = conn.openDataInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int ch = 0;
while ((ch = is.read()) != -1)
{
baos.write(ch);
}
byte[] imageData = baos.toByteArray();
//生成图片信息
Image image = Image.createImage(imageData, 0, imageData.length);
//在CANVAS中 画出qrcode图片
g.drawImage(image , width/2,fontheight * 3, Graphics.HCENTER| Graphics.TOP);
http://img.bimg.126.net/photo/outLqXf8ojfVBcdJLeRqvA==/3380514470295884406.jpg
http://img.bimg.126.net/photo/NpfuuNgSlen8Hklhvh5lEg==/3380514470295884404.jpg
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