java生成二维码并用fastdfs上传文件返回图片地址
建立生成二维码的功能
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>
写生成二维码的工具类：
package com.jinkao.distribution.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.IOException;
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());
}
}
//去掉白边
// bufferedImage = MatrixToImageWriter.toBufferedImage(bitMatrix);
} 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;
}
}
然后开发关于fastdfs的上传文件的方法，可以看一下这个地址：
springboot项目中fastdfs上传文件开发
这里我们用比如说一个链接来生成一个二维码，在上传到fstdfs上，来返回一个可以直接访问二维码链接的地址：
通用工具类：
public String packageUrlForLink(String url){
String link="";
QRCodeUtils qrCode=new QRCodeUtils(400,400);
qrCode.setMargin(1);
BufferedImage image=qrCode.getBufferedImage(url);
try {
//以流的方式讲图片上传到fastdfs上：
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
ImageIO.write(image, "png", outputStream);
InputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
//commonFileUtil.upfileImage()的方式其实是调用的
// fastFileStorageClient.uploadImageAndCrtThumbImage(is, size, fileExtName, metaData)的方法
link= commonFileUtil.upfileImage(inputStream,inputStream.available(),"png",null);
}catch (IOException ex){
ex.printStackTrace();
}
return link;
};
还有就是fastdfs的配置文件 还要对缩略图的大小进行设置，不然会报错‘！！！！！
fdfs:
soTimeout: 1500
connectTimeout: 1000
tracker-list: ip:端口
thumb-image:
width: 100
height: 100
在拿一个链接去生成二维码的时候，直接就返回了一个可以直接访问的二维码图片的链接了