二维码的生成与解析
1.导包（core-3.4.0.jar和javase-3.4.0.jar）
2.jsp页面(二维码的生成与解析)
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>二维码的生成与解析</title>
</head>
<body>
<img alt="" src="/code.action"/>
<br>
<form action="decode.action" method="post" enctype="multipart/form-data">
<input type="file" name="mf">
<input type="submit" value="解析">
</form>
</body>
</html>
3.servlet（二维码的生成）
@WebServlet("/code.action")
public class CodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//生成图片
// BufferedImage codeImage=ZXingCodeEncodeUtils.createZXingCodeNormal("smallzhs", 300, 300);
// ServletOutputStream outputStream = resp.getOutputStream();
// ImageIO.write(codeImage, "JPEG", outputStream);
// outputStream.close();
InputStream logoStream=this.getClass().getClassLoader().getResourceAsStream("logo.jpg");
BufferedImage codeImage=ZXingCodeEncodeUtils.createZxingCodeUseLogo("smallzhs", 300, 300, logoStream);
ServletOutputStream outputStream = resp.getOutputStream();
ImageIO.write(codeImage, "JPEG", outputStream);
outputStream.close();
}
}
4.utils工具类(二维码的生成【多种形式】)
/**
* 生成二维码
*/
public class ZXingCodeEncodeUtils {
// 二维码颜色
private static final int BLACK = 0xFF000000;
// 二维码背景颜色
private static final int WHITE = 0xFFFFFFFF;
// 二维码格式参数
private static final EnumMap<EncodeHintType, Object> hints = new EnumMap<EncodeHintType, Object>(
EncodeHintType.class);
static {
/*
* 二维码的纠错级别(排错率),4个级别： L (7%)、 M (15%)、 Q (25%)、 H (30%)(最高H)
* 纠错信息同样存储在二维码中，纠错级别越高，纠错信息占用的空间越多，那么能存储的有用讯息就越少；共有四级； 选择M，扫描速度快。
*/
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
// 二维码边界空白大小 1,2,3,4 (4为默认,最大)
hints.put(EncodeHintType.MARGIN, 1);
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");// 设置放入的字符的编码
}
/**
* 生成二维码保存到F盘
*/
public static void createZXingCodeSaveToDisk(String content, int width, int height, String savePath,
String imageType) {
try {
BitMatrix encode = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
//得到二维码的宽度和高度
int code_width = encode.getWidth();
int code_height = encode.getHeight();
//创建图片
BufferedImage image=new BufferedImage(code_width, code_height, BufferedImage.TYPE_INT_BGR);
// 把二维码里面的信息写到图片里面
for (int i = 0; i < code_width; i++) {
for (int j = 0; j < code_height; j++) {
image.setRGB(i, j, encode.get(i, j) ? BLACK : WHITE);
}
}
// 保存图片到硬盘
File file = new File(savePath);
if (!file.exists()) {
file.createNewFile();
}
ImageIO.write(image, imageType, file);
System.out.println("生成成功");
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 生成二维码返回图片对象【页面显示】
*/
public static BufferedImage createZXingCodeNormal(String content, int width, int height) {
try {
BitMatrix encode = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
// 得到二维码的宽度
int code_width = encode.getWidth();
int code_height = encode.getHeight();
// 创建图片
BufferedImage image = new BufferedImage(code_width, code_height, BufferedImage.TYPE_INT_RGB);
// 把二维码里面的信息写到图片里面
for (int i = 0; i < code_width; i++) {
for (int j = 0; j < code_height; j++) {
image.setRGB(i, j, encode.get(i, j) ? BLACK : WHITE);
}
}
return image;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 生成一张带logo的二维码
* @param logoStream logo的流对象
*
*/
public static void createZxingCodeUseLogoSaveToDisk(String content, int width, int height, String savePath,
String imageType,InputStream logoStream) {
try {
BufferedImage codeImage=createZxingCodeUseLogo(content, width, height, logoStream);
// 保存图片到硬盘
File file = new File(savePath);
if (!file.exists()) {
file.createNewFile();
}
ImageIO.write(codeImage, imageType, file);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 生成一张带logo的二维码 返回BuffredeImage【页面显示】
* @param logoStream logo的流对象
*
*/
public static BufferedImage createZxingCodeUseLogo(String content, int width, int height,InputStream logoStream) {
try {
//生成二维码图片
BufferedImage codeNormal = createZXingCodeNormal(content, width, height);
if(null!=codeNormal) {
//判断logoStream是否为空
if(null!=logoStream) {
//拿到可以操作当前图片的画笔
Graphics2D graphics = codeNormal.createGraphics();
//得到logo图片的对象
BufferedImage logoImage = ImageIO.read(logoStream);
//得到logo的原始宽高
int old_logo_width = logoImage.getWidth();
int old_logo_height = logoImage.getHeight();
//得到二维码的宽高
int code_width=codeNormal.getWidth();
int code_height=codeNormal.getHeight();
//算出logo在二维码里面能存在的最大值
int logo_max_width=code_width/5;
int logo_max_height=code_height/5;
//计算logo的可用宽高
int logo_width=logo_max_width<old_logo_width?logo_max_width:old_logo_width;
int logo_height=logo_max_height<old_logo_height?logo_max_height:old_logo_height;
//计算logo的开始点的坐标
int x=(code_width-logo_width)/2;
int y=(code_height-logo_height)/2;
/**
* logoImage logo图片对象
* x 开始画的x轴坐标
* y 开始画的y轴的坐
* logo_width 要画的x轴的长度
* logo_height 要画的y车的长度
* arg5 null
*/
graphics.drawImage(logoImage, x, y, logo_width, logo_height, null);
graphics.setStroke(new BasicStroke(2));
graphics.setColor(Color.WHITE);
//画白色边框
graphics.drawRoundRect(x, y, logo_width, logo_height, 15, 15);
graphics.dispose();//让画上的去的内容生效
return codeNormal;
}
}else {
System.out.println("生成失败");
}
} catch (Exception e) {
e.printStackTrace();
System.out.println("生成失败");
}
return null;
}
public static void main(String[] args) {
//createZXingCodeSaveToDisk("smallzhs",400,400,"F:/upload/image/xiaozhu.gif","JPEG");
InputStream logoStream=ZXingCodeEncodeUtils.class.getClassLoader().getResourceAsStream("logo.jpg");
createZxingCodeUseLogoSaveToDisk("smallzhs", 400, 400, "F:/upload/image/xiaozhu2.gif", "JPEG", logoStream);
}
}
二维码解析：
servlet(解析)：别忘记下面这个注解！！！！
@WebServlet("/decode.action")
@MultipartConfig
public class DeCodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
Part part=req.getPart("mf");
req.setCharacterEncoding("utf-8");
resp.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
String string = ZXingCodeDecodeUtils.decodeCodeStream(part.getInputStream());
PrintWriter out = resp.getWriter();
out.write(string);
out.flush();
out.close();
}
}
utils
/**
* 解析二维码
*/
public class ZXingCodeDecodeUtils {
// 二维码格式参数
private static final EnumMap<DecodeHintType, Object> decodeHints = new EnumMap<DecodeHintType, Object>(
DecodeHintType.class);
static {
decodeHints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
}
/**
* 解析文件
*
* @param path
*/
public static String decodeCodeFile(String path) {
File file = new File(path);
if (file.exists()) {
// 把文件转成图片对象
try {
String content = decodeCodeStream(new FileInputStream(file));
return content;
} catch (Exception e) {
e.printStackTrace();
return null;
}
} else {
return null;
}
}
/**
* 解析流
*
* @param is
*/
public static String decodeCodeStream(InputStream is) {
if (null != is) {
try {
BufferedImage image = ImageIO.read(is);
LuminanceSource source = new BufferedImageLuminanceSource(image);
Binarizer binarizer = new HybridBinarizer(source);
BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
MultiFormatReader reader = new MultiFormatReader();
Result result = reader.decode(binaryBitmap, decodeHints);
String content = result.getText();
return content;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
return null;
}
public static void main(String[] args) throws FileNotFoundException {
String string = decodeCodeStream(new FileInputStream(new File("F:/upload/image/xiaozhu2.gif")));
System.out.println(string);
}
}
ok！ 最后运行即可！
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