Java生成二维码并用FastDFS上传到文件服务器返回图片地址
1. maven依赖
<dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.1.0</version> </dependency> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.9</version> </dependency> <dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>3.2.1</version> </dependency>
2. 生成二维码工具类
package com.eongb0.common.utils;
import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
//二维码工具类（使用ZXingjar包）
public class QRCodeUtils {
// 默认宽为300
private Integer width = 600;
// 默认高为300
private Integer height = 600;
// 默认二维码图片格式
private String imageFormat = "png";
// 默认二维码字符编码
private String charType = "utf-8";
// 默认二维码的容错级别
// 容错等级 L、M、Q、H 其中 L 为最低, H 为最高
private ErrorCorrectionLevel corretionLevel = ErrorCorrectionLevel.M;
// 二维码与图片的边缘
private Integer margin = 0;
// 二维码参数
private Map<EncodeHintType, Object> encodeHits = new HashMap<EncodeHintType, Object>();
public QRCodeUtils(Integer width, Integer height, String imageFormat, String charType,
ErrorCorrectionLevel corretionLevel, Integer margin) {
if (width != null) {
this.width = width;
}
if (height != null) {
this.height = height;
}
if (imageFormat != null) {
this.imageFormat = imageFormat;
}
if (charType != null) {
this.charType = charType;
}
if (corretionLevel != null) {
this.corretionLevel = corretionLevel;
}
if (margin != null) {
this.margin = margin;
}
}
public QRCodeUtils(Integer width, Integer height, String imageFormat, String charType,
ErrorCorrectionLevel corretionLevel) {
this(width, height, imageFormat, charType, corretionLevel, null);
}
public QRCodeUtils(Integer width, Integer height, String imageFormat, String charType, Integer margin) {
this(width, height, imageFormat, charType, null, margin);
}
public QRCodeUtils(Integer width, Integer height, String imageFormat, String charType) {
this(width, height, imageFormat, charType, null, null);
}
public QRCodeUtils(Integer width, Integer height, String imageFormat) {
this(width, height, imageFormat, null, null, null);
}
public QRCodeUtils(Integer width, Integer height) {
this(width, height, null, null, null, null);
}
public QRCodeUtils() {
}
// 初始化二维码的参数
private void initialParamers() {
// 字符编码
encodeHits.put(EncodeHintType.CHARACTER_SET, this.charType);
// 容错等级 L、M、Q、H 其中 L 为最低, H 为最高
encodeHits.put(EncodeHintType.ERROR_CORRECTION, this.corretionLevel);
// 二维码与图片边距
encodeHits.put(EncodeHintType.MARGIN, margin);
}
// 得到二维码图片
public BufferedImage getBufferedImage(String content) {
initialParamers();
BufferedImage bufferedImage = null;
try {
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, this.width,
this.height, this.encodeHits);
//去掉白边
int[] rec = bitMatrix.getEnclosingRectangle();
int resWidth = rec[2] + 1;
int resHeight = rec[3] + 1;
BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
resMatrix.clear();
for (int i = 0; i < resWidth; i++) {
for (int j = 0; j < resHeight; j++) {
if (bitMatrix.get(i + rec[0], j + rec[1])) {
resMatrix.set(i, j);
}
}
}
//2
int width = resMatrix.getWidth();
int height = resMatrix.getHeight();
bufferedImage = new BufferedImage(width, height,BufferedImage.TYPE_INT_ARGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
bufferedImage.setRGB(x, y, resMatrix.get(x, y) == true ?
Color.BLACK.getRGB():Color.WHITE.getRGB());
}
}
} catch (WriterException e) {
e.printStackTrace();
return null;
}
return bufferedImage;
}
// 将二维码保存到输出流中
public void writeToStream(String content, OutputStream os) {
initialParamers();
try {
BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, this.width, this.height,
this.encodeHits);
MatrixToImageWriter.writeToStream(matrix, this.imageFormat, os);
} catch (Exception e) {
e.printStackTrace();
}
}
// 将二维码图片保存为文件
public void createQrImage(String content, File file) {
initialParamers();
try {
BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, this.width, this.height,this.encodeHits);
MatrixToImageWriter.writeToFile(matrix, this.imageFormat, file);
} catch (Exception e) {
e.printStackTrace();
}
}
// 将二维码图片保存到指定路径
public void createQrImage(String content, String path) {
initialParamers();
try {
BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, this.width, this.height,this.encodeHits);
MatrixToImageWriter.writeToPath(matrix, this.imageFormat, new File(path).toPath());
//MatrixToImageWriter.
} catch (Exception e) {
e.printStackTrace();
}
}
public void newcreateQrImage(String content, String path) {
initialParamers();
try {
BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, this.width, this.height,this.encodeHits);
// MatrixToImageWriter.writeToPath(matrix, this.imageFormat, new File(path).toPath());
//MatrixToImageWriter.w
} catch (Exception e) {
e.printStackTrace();
}
}
//识别图片二维码
public String decodeQrImage(File file){
String content=null;
try {
BufferedImage bufferedImage=ImageIO.read(new FileInputStream(file));
LuminanceSource source=new BufferedImageLuminanceSource(bufferedImage);
Binarizer binarizer=new HybridBinarizer(source);
BinaryBitmap image=new BinaryBitmap(binarizer);
Map<DecodeHintType,Object> decodeHits=new HashMap<DecodeHintType, Object>();
decodeHits.put(DecodeHintType.CHARACTER_SET, this.charType);
Result result=new MultiFormatReader().decode(image, decodeHits);
content=result.getText();
}catch (Exception e) {
e.printStackTrace();
}
return content;
}
public Integer getWidth() {
return width;
}
public void setWidth(Integer width) {
this.width = width;
}
public Integer getHeight() {
return height;
}
public void setHeight(Integer height) {
this.height = height;
}
public String getImageFormat() {
return imageFormat;
}
public void setImageFormat(String imageFormat) {
this.imageFormat = imageFormat;
}
public String getCharType() {
return charType;
}
public void setCharType(String charType) {
this.charType = charType;
}
public ErrorCorrectionLevel getCorretionLevel() {
return corretionLevel;
}
public void setCorretionLevel(ErrorCorrectionLevel corretionLevel) {
this.corretionLevel = corretionLevel;
}
public Integer getMargin() {
return margin;
}
public void setMargin(Integer margin) {
this.margin = margin;
}
public Map<EncodeHintType, Object> getHits() {
return encodeHits;
}
public void setHits(Map<EncodeHintType, Object> hits) {
this.encodeHits = hits;
}
}
3. 将生成的二维码上传到FastDFS接口
@ApiOperation("获取二维码URL")
@GetMapping("getCodeUrl")
public Result packageUrlForLink(@LoginUser(isFull = true) SysUser user){
String link="";
QRCodeUtils qrCode=new QRCodeUtils(100,100);
qrCode.setMargin(1);
String deptId = user.getDeptId();
SysDept dept = userService.findDeptById(deptId);
String content = "部门名称："+dept.getDeptName()+"\r\n打印人："+user.getUsername() + "\r\n打印时间：" + GTime.getLogTime();
BufferedImage image=qrCode.getBufferedImage(content);
try {
//以流的方式将图片上传到fastdfs上：
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
ImageIO.write(image, "png", outputStream);
InputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
// 调用FastDFS中的接口将数据流保存到服务器返回图片地址
StorePath storePath = storageClient.uploadImageAndCrtThumbImage(inputStream,inputStream.available(),"png",null);
link = "http://" + fileServerProperties.getFdfs().getWebUrl() + "/" + storePath.getFullPath();
}catch (IOException ex){
ex.printStackTrace();
}
Map<String,Object> model = new HashMap<>();
model.put("imgStr",link);
return Result.succeed(model);
}
4. FastDFS配置文件 要对缩略图的大小进行设置
fdfs:
soTimeout: 1500
connectTimeout: 1000
tracker-list: ip:端口
thumb-image:
width: 100
height: 100
