本次本篇使用的工具是Maven中的
maven-assembly-plugin
插件。
======================================================================================================
1.首先，需要新建一个maven项目，将单个或多个java文件拷贝到本项目中
例如，下面这个QR_Code.java文件
package com.sxd.util;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.HashMap;
import java.util.Map;
import javax.imageio.ImageIO;
import com.google.zxing.*;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeReader;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**
* 二维码工具类
* @author SXD
* @Date 2018.2.1
*
*/
public class QR_Code {
private static int BLACK = 0x000000;
private static int WHITE = 0xFFFFFF;
/**
* 内部类，设置二维码相关参数
*/
@Data(staticConstructor = "of")
@NoArgsConstructor
@AllArgsConstructor
@Accessors(chain = true)
public class CodeModel {
/**
* 正文
*/
private String contents;
/**
* 二维码宽度
*/
private int width = 400;
/**
* 二维码高度
*/
private int height = 400;
/**
* 图片格式
*/
private String format = "png";
/**
* 编码方式
*/
private String character_set = "utf-8";
/**
* 字体大小
*/
private int fontSize = 12;
/**
* logo
*/
private File logoFile;
/**
* logo所占二维码比例
*/
private float logoRatio = 0.20f;
/**
* 二维码下文字
*/
private String desc;
private int whiteWidth;//白边的宽度
private int[] bottomStart;//二维码最下边的开始坐标
private int[] bottomEnd;//二维码最下边的结束坐标
}
/**
* 1.创建最原始的二维码图片
* @param info
* @return
*/
private BufferedImage createCodeImage(CodeModel info){
String contents = info.getContents() == null || "".equals(info.getContents()) ? "暂无内容" : info.getContents();//获取正文
int width = info.getWidth();//宽度
int height = info.getHeight();//高度
Map<EncodeHintType, Object> hint = new HashMap<EncodeHintType, Object>();
hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//设置二维码的纠错级别【级别分别为M L H Q ，H纠错能力级别最高，约可纠错30%的数据码字】
hint.put(EncodeHintType.CHARACTER_SET, info.getCharacter_set());//设置二维码编码方式【UTF-8】
hint.put(EncodeHintType.MARGIN, 0);
MultiFormatWriter writer = new MultiFormatWriter();
BufferedImage img = null;
try {
//构建二维码图片
//QR_CODE 一种矩阵二维码
BitMatrix bm = writer.encode(contents, BarcodeFormat.QR_CODE, width, height, hint);
int[] locationTopLeft = bm.getTopLeftOnBit();
int[] locationBottomRight = bm.getBottomRightOnBit();
info.setBottomStart(new int[]{locationTopLeft[0], locationBottomRight[1]});
info.setBottomEnd(locationBottomRight);
int w = bm.getWidth();
int h = bm.getHeight();
img = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
for(int x=0;x<w;x++){
for(int y=0;y<h;y++){
img.setRGB(x, y, bm.get(x, y) ? BLACK : WHITE);
}
}
} catch (WriterException e) {
e.printStackTrace();
}
return img;
}
/**
* 2.为二维码增加logo和二维码下文字
* logo--可以为null
* 文字--可以为null或者空字符串""
* @param info
* @param output
*/
private void dealLogoAndDesc(CodeModel info, OutputStream output){
//获取原始二维码图片
BufferedImage bm = createCodeImage(info);
//获取Logo图片
File logoFile = info.getLogoFile();
int width = bm.getWidth();
int height = bm.getHeight();
Graphics g = bm.getGraphics();
//处理logo
if(logoFile!=null && logoFile.exists()){
try{
BufferedImage logoImg = ImageIO.read(logoFile);
int logoWidth = logoImg.getWidth();
int logoHeight = logoImg.getHeight();
float ratio = info.getLogoRatio();//获取Logo所占二维码比例大小
if(ratio>0){
logoWidth = logoWidth>width*ratio ? (int)(width*ratio) : logoWidth;
logoHeight = logoHeight>height*ratio ? (int)(height*ratio) : logoHeight;
}
int x = (width-logoWidth)/2;
int y = (height-logoHeight)/2;
//根据logo 起始位置 和 宽高 在二维码图片上画出logo
g.drawImage(logoImg, x, y, logoWidth, logoHeight, null);
}catch(Exception e){
e.printStackTrace();
}
}
//处理二维码下文字
String desc = info.getDesc();
if(!(desc == null || "".equals(desc))){
try{
//设置文字字体
int whiteWidth = info.getHeight()-info.getBottomEnd()[1];
Font font = new Font("黑体", Font.BOLD, info.getFontSize());
int fontHeight = g.getFontMetrics(font).getHeight();
//计算需要多少行
int lineNum = 1;
int currentLineLen = 0;
for(int i=0;i<desc.length();i++){
char c = desc.charAt(i);
int charWidth = g.getFontMetrics(font).charWidth(c);
if(currentLineLen+charWidth>width){
lineNum++;
currentLineLen = 0;
continue;
}
currentLineLen += charWidth;
}
int totalFontHeight = fontHeight*lineNum;
int wordTopMargin = 4;
BufferedImage bm1 = new BufferedImage(width, height+totalFontHeight+wordTopMargin-whiteWidth, BufferedImage.TYPE_INT_RGB);
Graphics g1 = bm1.getGraphics();
if(totalFontHeight+wordTopMargin-whiteWidth>0){
g1.setColor(Color.WHITE);
g1.fillRect(0, height, width, totalFontHeight+wordTopMargin-whiteWidth);
}
g1.setColor(new Color(BLACK));
g1.setFont(font);
g1.drawImage(bm, 0, 0, null);
width = info.getBottomEnd()[0]-info.getBottomStart()[0];
height = info.getBottomEnd()[1]+1;
currentLineLen = 0;
int currentLineIndex = 0;
int baseLo = g1.getFontMetrics().getAscent();
for(int i=0;i<desc.length();i++){
String c = desc.substring(i, i+1);
int charWidth = g.getFontMetrics(font).stringWidth(c);
if(currentLineLen+charWidth>width){
currentLineIndex++;
currentLineLen = 0;
g1.drawString(c, currentLineLen + whiteWidth, height+baseLo+fontHeight*(currentLineIndex)+wordTopMargin);
currentLineLen = charWidth;
continue;
}
g1.drawString(c, currentLineLen+whiteWidth, height+baseLo+fontHeight*(currentLineIndex) + wordTopMargin);
currentLineLen += charWidth;
}
g1.dispose();
bm = bm1;
}catch(Exception e){
e.printStackTrace();
}
}
try{
ImageIO.write(bm, (info.getFormat() == null || "".equals(info.getFormat())) ? info.getFormat() : info.getFormat(), output);
}catch(Exception e){
e.printStackTrace();
}
}
/**
* 3.创建 带logo和文字的二维码
* @param info
* @param file
*/
public void createCodeImage(CodeModel info, File file){
File parent = file.getParentFile();
if(!parent.exists())parent.mkdirs();
OutputStream output = null;
try{
output = new BufferedOutputStream(new FileOutputStream(file));
dealLogoAndDesc(info, output);
output.flush();
}catch(Exception e){
e.printStackTrace();
}finally{
try {
output.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 3.创建 带logo和文字的二维码
* @param info
* @param filePath
*/
public void createCodeImage(CodeModel info, String filePath){
createCodeImage(info, new File(filePath));
}
/**
* 4.创建 带logo和文字的二维码
* @param filePath
*/
public void createCodeImage(String contents,String filePath){
CodeModel codeModel = new CodeModel();
codeModel.setContents(contents);
createCodeImage(codeModel, new File(filePath));
}
/**
* 5.读取 二维码 获取二维码中正文
* @param input
* @return
*/
public String decode(InputStream input){
Map<DecodeHintType, Object> hint = new HashMap<DecodeHintType, Object>();
hint.put(DecodeHintType.POSSIBLE_FORMATS, BarcodeFormat.QR_CODE);
String result = "";
try{
BufferedImage img = ImageIO.read(input);
int[] pixels = img.getRGB(0, 0, img.getWidth(), img.getHeight(), null, 0, img.getWidth());
LuminanceSource source = new RGBLuminanceSource(img.getWidth(), img.getHeight(), pixels);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
QRCodeReader reader = new QRCodeReader();
Result r = reader.decode(bitmap, hint);
result = r.getText();
}catch(Exception e){
result="读取错误";
}
return result;
}
}