如何·生成二维码

摘要: jsp生成二维码

package com.cn;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.cn.erweima;

public class codeServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

@Override
protected void service(HttpServletRequest requset, HttpServletResponse response)
throws ServletException, IOException {
String content = "姓名:maysnow 电话:123687495";
erweima encoder = new erweima();
encoder.encoderQRCoder(content, response);
}

}

package com.cn;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.cn.erweima;

public class codeServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

@Override
protected void service(HttpServletRequest requset, HttpServletResponse response)
throws ServletException, IOException {
String content = "姓名:maysnow 电话:123687495";
erweima encoder = new erweima();
encoder.encoderQRCoder(content, response);
}

}

<br><img style="height:80px;width:80px" src="codea" />

package train.sql.com;

import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;

import javax.servlet.http.HttpServletResponse;

import com.swetake.util.Qrcode;

public class erweima {

public void encoderQRCoder(String content, HttpServletResponse response) {
try {
Qrcode handler = new Qrcode();
handler.setQrcodeErrorCorrect('M');
handler.setQrcodeEncodeMode('B');
handler.setQrcodeVersion(7);

System.out.println(content);
byte[] contentBytes = content.getBytes("UTF-8");

BufferedImage bufImg = new BufferedImage(80, 80, BufferedImage.TYPE_INT_RGB);

Graphics2D gs = bufImg.createGraphics();

gs.setBackground(Color.WHITE);
gs.clearRect(0, 0, 140, 140);

//设定图像颜色：BLACK
gs.setColor(Color.BLACK);

//设置偏移量  不设置肯能导致解析出错
int pixoff = 2;
//输出内容：二维码
if(contentBytes.length > 0 && contentBytes.length < 124) {
boolean[][] codeOut = handler.calQrcode(contentBytes);
for(int i = 0; i < codeOut.length; i++) {
for(int j = 0; j < codeOut.length; j++) {
if(codeOut[j][i]) {
gs.fillRect(j * 3 + pixoff, i * 3 + pixoff,3, 3);
}
}
}
} else {
System.err.println("QRCode content bytes length = " + contentBytes.length + " not in [ 0,120 ]. ");
}

gs.dispose();
bufImg.flush();

//生成二维码QRCode图片
ImageIO.write(bufImg, "jpg", response.getOutputStream());

} catch (Exception e) {
e.printStackTrace();
}
}

}