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不說廢話了直接上代碼
注意使用QRCode是需要zxing的核心jar包，這里給大家提供下載地址
https://download.csdn.net/download/dsn727455218/10515340
1.二維碼的工具類
public class QR_Code {
private static int BLACK = 0x000000;
private static int WHITE = 0xFFFFFF;
/**
* 1.創建最原始的二維碼圖片
*
* @param info
* @return
*/
private BufferedImage createCodeImage(CodeModel info) {
String contents = info.getContents();//獲取正文
int width = info.getWidth();//寬度
int height = info.getHeight();//高度
Map<EncodeHintType, Object> hint = new HashMap<>();
hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//設置二維碼的糾錯級別【級別分別為M L H Q ，H糾錯能力級別最高，約可糾錯30%的數據碼字】
hint.put(EncodeHintType.CHARACTER_SET, info.getCharacter_set());//設置二維碼編碼方式【UTF-8】
hint.put(EncodeHintType.MARGIN, 0);
MultiFormatWriter writer = new MultiFormatWriter();
BufferedImage img = null;
try {
//構建二維碼圖片
//QR_CODE 一種矩陣二維碼
BitMatrix bm = writer.encode(contents, BarcodeFormat.QR_CODE, width, height + 5, 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.為二維碼增加logo和二維碼下文字 logo--可以為null 文字--可以為null或者空字符串""
*
* @param info
* @param output
*/
private void dealLogoAndDesc(CodeModel info, OutputStream output) {
//獲取原始二維碼圖片
BufferedImage bm = createCodeImage(info);
//獲取Logo圖片
File logoFile = info.getLogoFile();
int width = bm.getWidth();
int height = bm.getHeight();
Graphics g = bm.getGraphics();
//處理logo
if (logoFile != null && logoFile.exists()) {
try {
BufferedImage logoImg = ImageIO.read(logoFile);
int logoWidth = logoImg.getWidth();
int logoHeight = logoImg.getHeight();
float ratio = info.getLogoRatio();//獲取Logo所占二維碼比例大小
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;
//根據logo 起始位置 和 寬高 在二維碼圖片上畫出logo
g.drawImage(logoImg, x, y, logoWidth, logoHeight, null);
} catch (Exception e) {
e.printStackTrace();
}
}
//處理二維碼下文字
String desc = info.getDesc();
if (!"".equals(desc)) {
try {
//設置文字字體
int whiteWidth = info.getHeight() - info.getBottomEnd()[1];
Font font = new Font("宋體", Font.PLAIN, info.getFontSize());
int fontHeight = g.getFontMetrics(font).getHeight();
//計算需要多少行
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);
int startX = (78 - (12 * desc.length())) / 2;
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 + startX - 5,
-5 + height + baseLo + fontHeight * (currentLineIndex) + wordTopMargin);
currentLineLen = charWidth;
continue;
}
g1.drawString(c, currentLineLen + startX - 5,
-5 + height + baseLo + fontHeight * (currentLineIndex) + wordTopMargin);
currentLineLen += charWidth;
}
//處理二維碼下日期
String date = info.getDate();
g1.drawString(date, 5, 6 + height + baseLo + fontHeight * (currentLineIndex) + wordTopMargin);
g1.dispose();
bm = bm1;
} catch (Exception e) {
e.printStackTrace();
}
}
try {
ImageIO.write(bm, info.getFormat(), output);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 3.創建 帶logo和文字的二維碼
*
* @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.創建 帶logo和文字的二維碼
*
* @param info
* @param filePath
*/
public void createCodeImage(CodeModel info, String filePath) {
createCodeImage(info, new File(filePath));
}
/**
* 4.創建 帶logo和文字的二維碼
*
* @param filePath
*/
public void createCodeImage(String contents, String filePath) {
CodeModel codeModel = new CodeModel();
codeModel.setContents(contents);
createCodeImage(codeModel, new File(filePath));
}
/**
* 5.讀取 二維碼 獲取二維碼中正文
*
* @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 = "讀取錯誤";
}
return result;
}
public static void main(String[] args) {
String imgname = String.valueOf(System.currentTimeMillis()) + ".png";
CodeModel info = new CodeModel();
info.setContents("客戶:倍特 品牌:倍特 型號:XH001 日期:2018-06-19 檢驗員:易工");
info.setWidth(68);
info.setHeight(68);
info.setFontSize(12);
info.setLogoFile(new File("F:\\軟件安全下載目錄\\personnelManage\\" + imgname));
info.setDesc("玫瑰之約");
info.setDate("2018-06-19");
info.setLogoFile(null);
QR_Code code = new QR_Code();
}
}
2.二維碼實體類
public class CodeModel {
/**
* @return the date
*/
public String getDate() {
return date;
}
/**
* @param date
* the date to set
*/
public void setDate(String date) {
this.date = date;
}
/**
* @return the contents
*/
public String getContents() {
return contents;
}
/**
* @param contents
* the contents to set
*/
public void setContents(String contents) {
this.contents = contents;
}
/**
* @return the width
*/
public int getWidth() {
return width;
}
/**
* @param width
* the width to set
*/
public void setWidth(int width) {
this.width = width;
}
/**
* @return the height
*/
public int getHeight() {
return height;
}
/**
* @param height
* the height to set
*/
public void setHeight(int height) {
this.height = height;
}
/**
* @return the format
*/
public String getFormat() {
return format;
}
/**
* @param format
* the format to set
*/
public void setFormat(String format) {
this.format = format;
}
/**
* @return the character_set
*/
public String getCharacter_set() {
return character_set;
}
/**
* @param character_set
* the character_set to set
*/
public void setCharacter_set(String character_set) {
this.character_set = character_set;
}
/**
* @return the fontSize
*/
public int getFontSize() {
return fontSize;
}
/**
* @param fontSize
* the fontSize to set
*/
public void setFontSize(int fontSize) {
this.fontSize = fontSize;
}
/**
* @return the logoFile
*/
public File getLogoFile() {
return logoFile;
}
/**
* @param logoFile
* the logoFile to set
*/
public void setLogoFile(File logoFile) {
this.logoFile = logoFile;
}
/**
* @return the logoRatio
*/
public float getLogoRatio() {
return logoRatio;
}
/**
* @param logoRatio
* the logoRatio to set
*/
public void setLogoRatio(float logoRatio) {
this.logoRatio = logoRatio;
}
/**
* @return the desc
*/
public String getDesc() {
return desc;
}
/**
* @param desc
* the desc to set
*/
public void setDesc(String desc) {
this.desc = desc;
}
/**
* @return the whiteWidth
*/
public int getWhiteWidth() {
return whiteWidth;
}
/**
* @param whiteWidth
* the whiteWidth to set
*/
public void setWhiteWidth(int whiteWidth) {
this.whiteWidth = whiteWidth;
}
/**
* @return the bottomStart
*/
public int[] getBottomStart() {
return bottomStart;
}
/**
* @param bottomStart
* the bottomStart to set
*/
public void setBottomStart(int[] bottomStart) {
this.bottomStart = bottomStart;
}
/**
* @return the bottomEnd
*/
public int[] getBottomEnd() {
return bottomEnd;
}
/**
* @param bottomEnd
* the bottomEnd to set
*/
public void setBottomEnd(int[] bottomEnd) {
this.bottomEnd = bottomEnd;
}
/**
* 正文
*/
private String contents;
/**
* 二維碼寬度
*/
private int width = 400;
/**
* 二維碼高度
*/
private int height = 400;
/**
* 圖片格式
*/
private String format = "png";
/**
* 編碼方式
*/
private String character_set = "utf-8";
/**
* 字體大小
*/
private int fontSize = 12;
/**
* logo
*/
private File logoFile;
/**
* logo所占二維碼比例
*/
private float logoRatio = 0.20f;
/**
* 二維碼下文字
*/
private String desc;
/**
* 下方日期
*/
private String date;
private int whiteWidth;//白邊的寬度
private int[] bottomStart;//二維碼最下邊的開始坐標
private int[] bottomEnd;//二維碼最下邊的結束坐標
}
3.action中調用
@ResponseBody
@RequestMapping(value = "/addqrcode")
public String addqrcode(HttpServletRequest request, String msg) throws Exception {
String realPath = request.getSession().getServletContext().getRealPath("/") + "\\qrcode\\";
msg = String.valueOf(System.currentTimeMillis()) + ".png";
CodeModel info = new CodeModel();
info.setContents("客戶:" + request.getParameter("customer") + " 品牌:" + request.getParameter("brand") + " 型號:"
+ request.getParameter("model") + " 日期:" + request.getParameter("addtime") + " 檢驗員:"
+ request.getParameter("testpersion"));
info.setWidth(68);
info.setHeight(68);
info.setFontSize(12);
info.setLogoFile(new File(realPath + msg));
info.setDesc(request.getParameter("brand"));
info.setDate(request.getParameter("addtime"));
info.setLogoFile(null);
QR_Code code = new QR_Code();
code.createCodeImage(info, realPath + msg);
return msg;
}
以上方法就可以實現帶logo，以及下方顯示文字的二維碼。不需要logo，參數可以傳null。
接來下說說二維碼的打印，根據實際需要可以自定義設置二維碼的尺寸，以及圖片的格式
4.打印方法
需要注意的是：一是生成保存二維碼的地址，二是打印機驅動必須啟動
/**
* 打印二維碼
*
* @param fileName
* @param count
*/
@ResponseBody
@RequestMapping(value = "/printImage")
public static void printImage(String fileName, int count, HttpServletRequest request) {
String realPath = request.getSession().getServletContext().getRealPath("/") + "\\qrcode\\";
try {
DocFlavor dof = null;
if (fileName.endsWith(".gif")) {
dof = DocFlavor.INPUT_STREAM.GIF;
} else if (fileName.endsWith(".jpg")) {
dof = DocFlavor.INPUT_STREAM.JPEG;
} else if (fileName.endsWith(".png")) {
dof = DocFlavor.INPUT_STREAM.PNG;
}
// 獲取默認打印機
PrintService ps = PrintServiceLookup.lookupDefaultPrintService();
PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
// pras.add(OrientationRequested.PORTRAIT);
// pras.add(PrintQuality.HIGH);
pras.add(new Copies(count));
pras.add(MediaSizeName.ISO_A10); // 設置打印的紙張
DocAttributeSet das = new HashDocAttributeSet();
das.add(new MediaPrintableArea(0, 0, 1, 1, MediaPrintableArea.INCH));
FileInputStream fin = new FileInputStream(realPath + fileName);
Doc doc = new SimpleDoc(fin, dof, das);
DocPrintJob job = ps.createPrintJob();
job.print(doc, pras);
fin.close();
} catch (IOException ie) {
ie.printStackTrace();
} catch (PrintException pe) {
pe.printStackTrace();
}
}
看着是不是很簡單，完美的解決。
到這里已經完成了對文件的預覽功能，如有需要可以加我Q群【308742428】大家一起討論技術。
后面會不定時為大家更新文章，敬請期待。
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