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手把手教你生成二维码-google.zxing

2015-09-18 23:35 489 查看
一、目标

输入网址,生成网址的二维码

二、概况

1.效果:UI丑,但功能实现了



2.项目目录



三、用到的第三方资源

1.google的扫码包zxing

2.JQuery

四、步骤(用myEclipse)

1.新建工程,选择web project



2.加入第三方资源(zxing包和jQuery)

2.1

2.1.1复制,粘贴,加入zxing的jar包(所有文件在附件中下载)



2.2.2右键jar包加入buildpath



2.2加入jQuery文件

2.2.1在WebRoot下新建文件夹js





复制粘贴jQuery文件到此文件夹



3.按需求修改webroot下的index.jsp页面如下:

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>二维码</title>
<script src="js/jquery.min.js"></script>
<script>
$(function(){
$("input[type=submit]").click(function(e){
e.preventDefault();
$("#qrcode_div").empty().append("<img id='qrImg' />");
$("#qrImg").attr("src", "qrcode?website="+$("input[type=text][name=website]").val());//此处会访问servlet
});
});
</script>
</head>

<body>
<form>
网址<input type="text" name="website" />
<input type="submit" value="生成二维码" />
<div id="qrcode_div"></div>
</form>
</body>
</html>


4.新建servlet文件

4.1右键工程文件夹--》new ---->servlet(myEclipse会自动配置servlet到web.xml文件)





QRCode.java servlet文件的代码如下:

package servlet;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import util.QRCodeUtil;

import com.google.zxing.WriterException;

public class QRCode extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
String website = request.getParameter("website");
try {
QRCodeUtil.genGR(website, response.getOutputStream());
} catch (WriterException e) {
e.printStackTrace();
}
//String website = request.getAttribute("website").toString();
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}

}


5.新建辅助类文件,作用是生成二维码(QRCodeUtil.java)

5.1右键工程文件夹--》new--->class,如下图





QRCodeUtil.java的代码如下:

package util2;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

public class QRCodeUtil {

private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;

public static void genGR(String website, OutputStream output) throws WriterException, IOException {
int width = 300;
int height = 300;
String format = "jpg";
Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
//Hashtable hints = new Hashtable();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
BitMatrix bm = new MultiFormatWriter().encode(website, BarcodeFormat.QR_CODE, width, height, hints);

BufferedImage image = toImage(bm);
ImageIO.write(image, format, output);	//把二维码写到response的输出流
}

private static BufferedImage toImage(BitMatrix bm) {
int width = bm.getWidth();
int height = bm.getHeight();
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for(int x = 0;x < width; x++){
for(int y = 0; y < height; y++ ){
image.setRGB(x, y, bm.get(x, y) ? BLACK : WHITE);
}
}
return image;
}

}


6.至此,所有文件已完成,接下来布置项目,启动tomcat,访问文件,如下图



布置完成后,点击debug启动项目



启动成功后,在浏览器中访问文件



PS:

可以修改QRCodeUtil.java文件中的颜色配置,以生成彩色的二维码,例如:

private static final int BLACK = 0xff0000ff;//0xFF000000;
private static final int WHITE = 0xffffff00;//0xFFFFFFFF;



常见颜色代码如下:

这些颜色常数是定义在android.graphics.Color里的:

类型

常数



色码

int

BLACK

-16777216

0xff000000

int

BLUE

-16776961

0xff0000ff

int

CYAN

-16711681

0xff00ffff

int

DKGRAY

-12303292

0xff444444

int

GRAY

-7829368

0xff888888

int

GREEN

-16711936

0xff00ff00

int

LTGRAY

-3355444

0xffcccccc

int

MAGENTA

-65281

0xffff00ff

int

RED

-65536

0xffff0000

int

TRANSPARENT

0

0x00000000

int

WHITE

-1

0xffffffff

int

YELLOW

-256

0xffffff00

项目附件:
http://files.cnblogs.com/files/shamgod/QRCode.zip
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