【Java 二维码】生成二维码

package utils;import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.InputStream;
import java.util.EnumMap;import javax.imageio.ImageIO;import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;/**
* 生成二维码
*/
public class ZXingCodeEncodeUtils { public static void main(String[] args) {
// createZXingCodeSaveToDisk("kikyo", 400, 400, "D:/kikyo.gif", "JPEG");
InputStream logoStream = ZXingCodeEncodeUtils.class.getClassLoader().getResourceAsStream("image/logo.jpg");
createZxingCodeUseLogoSaveToDisk("kikyo", 400, 400, "D:/kikyo.jpg", "JPEG", logoStream);
System.out.println("生成成功");
} // 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
} /**
* 生成二维码保存到目标路径
*/
public static void createZXingCodeSaveToDisk(String content, int width, int height, String savePath, String imageType) {
try {
BufferedImage image = createZXingCodeNormal(content, width, height);
// 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
*/
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
*
* @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);
//判断logoStream是否为空
if (null == codeNormal || null == logoStream) {
System.out.println("codeNormal or logoStream is null");
return null;
}
//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;
} catch (Exception e) {
e.printStackTrace();
System.out.println("生成失败 " + e.getMessage());
return null;
}
}
}

package utils;import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.EnumMap;import javax.imageio.ImageIO;import com.google.zxing.Binarizer;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;/**
* 解析二维码
*/
public class ZXingCodeDecodeUtils { public static void main(String[] args) throws FileNotFoundException {
// String string = decodeCodeFile("D:/kikyo.gif");
String string = decodeCodeStream(new FileInputStream(new File("D:/kikyo.jpg")));
System.out.println(string);
} // 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
*/
public static String decodeCodeFile(String path) {
File file = new File(path);
if (!file.exists())
return null;
// 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;
}
} /**
* 解析流
*/
public static String decodeCodeStream(InputStream inputStream) {
if (null == inputStream)
return null;
try {
BufferedImage image = ImageIO.read(inputStream);
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;
}
}
}

@WebServlet("/code.action")
public class CodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
} protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//生成图片
// BufferedImage codeImage=ZXingCodeEncodeUtils.createZXingCodeNormal("kikyo", 300, 300);
InputStream logoStream = this.getClass().getClassLoader().getResourceAsStream("/image/logo.jpg");
BufferedImage codeImage = ZXingCodeEncodeUtils.createZxingCodeUseLogo("kikyo", 300, 300, logoStream); ServletOutputStream outputStream = response.getOutputStream();
ImageIO.write(codeImage, "JPEG", outputStream);
outputStream.close();
}
}

@WebServlet("/decode.action")
@MultipartConfig
public class DeCodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
} protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Part part = request.getPart("mf");
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String string = ZXingCodeDecodeUtils.decodeCodeStream(part.getInputStream());
PrintWriter out = response.getWriter();
out.write(string);
out.flush();
out.close();
}
}

<img alt="" src="code.action" >
<form action="decode.action" method="post" enctype="multipart/form-data">
<input type="file" name="mf">
<input type="submit" value="解析">
</form>

<!-- servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.annotation</groupId>
<artifactId>javax.annotation-api</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency> <!-- ZXing -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.3</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.3.3</version>
</dependency>