QRCode生成二維碼並帶有logo圖片
阿新 • • 發佈：2019-02-10
最近專案需要生成帶logo的二維碼供前臺下載，在網上找了幾篇文章，整合了一下。
首先需要的是QRCode.jar，我專案是直接maven依賴
<!-- Qrcode二維碼 -->
<dependency>
<groupId>QRCode</groupId>
<artifactId>QRCode</artifactId>
<version>3.0</version>
</dependency> 獲取資訊通過ajax傳送給後臺進行接收處理
function printEwm(){
var LCNAME = $("input[name=LCNAME]").val();
var BJH = $("input[name=BJH]").val();
var SX = $("input[name=SX]").val();
var SQR = $("input[name=SQR]").val();
var LXDH = $("input[name=LXDH]").val();
var SFZHM = $("input[name=SFZHM]").val();
var SQSJ = $("input[name=SQSJ]" 處理這些資訊並通過genQrcode()方法傳入輸出路徑和資訊生成二維碼，返回一個路徑供前臺下載（專案需要。。）
@RequestMapping(value="bpm/bmfw/printEwm",method=RequestMethod.POST)
public @ResponseBody String printEwm(@RequestParam("lcname") String lcname,@RequestParam("bjh") String bjh,@RequestParam("sx") String sx,
@RequestParam("sqr") String sqr,@RequestParam("lxdh") String lxdh,@RequestParam("sfzhm") String sfzhm,@RequestParam("sqsj") String sqsj,
HttpServletResponse response,HttpServletRequest request) throws UnsupportedEncodingException{
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日");
String time = sdf.format(date);
/*System.out.println(time);*/
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyyMMddHHmmssSS");
String picTime = sdf2.format(date);
String url = "\n許可證號:"+bjh+"\n申請人/單位:"+sqr+"\n統一社會信用程式碼/身份證號碼:"+sfzhm+"\n許可事項:"+sx+"\n聯絡電話:"+lxdh+"\n發證機關:丁蜀鎮便民服務中心"+"\n申請時間:"+sqsj+"\n發證時間:"+time;
String path = request.getSession().getServletContext().getRealPath("resources")+File.separator+"申請單資訊二維碼"+picTime+".jpg";
try {
genQrcode(url, path,response,request);
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("二維碼生成完畢");
String result = "bpm/bmfw/downloadEwm?fileName=";
return result+URLEncoder.encode("申請單資訊二維碼"+picTime+".jpg", "utf-8");
}這是生成二維碼的具體實現，以及在二維碼中插入logo圖片
/**
* 生成二維碼
* @param url 二維碼的url文字內容
* @param path 要存放二維碼的路徑
* @throws IOException
*/
public void genQrcode(String url,String path,HttpServletResponse response,HttpServletRequest request) throws IOException{
Qrcode x=new Qrcode();
x.setQrcodeErrorCorrect('M');//糾錯等級（四種等級）
x.setQrcodeEncodeMode('B');//N代表數字，A代表a-Z,B代表其他字元
x.setQrcodeVersion(20);//版本 ,版本越大，容納的位元組數越多
/*int width = 67 + 12 * (7 - 1);//設定二維碼的大小公式：67 + 12 * （version - 1）
int height = 67 + 12 * (7 - 1); */
int width = 300;//設定二維碼的大小公式：67 + 12 * （version - 1）
int height = 300;
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D gs = bufferedImage.createGraphics();
gs.setBackground(Color.WHITE);
gs.setColor(Color.BLACK);
gs.clearRect(0, 0, width, height);//清除畫板的內容
int pixoff = 2;//新增一個偏移量
byte[] d = url.getBytes("utf-8");
System.out.println(d.length);
if (d.length>0 && d.length <500){
boolean[][] s = x.calQrcode(d);
for (int i=0;i<s.length;i++){
for (int j=0;j<s.length;j++){
if (s[j][i]) {
gs.fillRect(j*3 + pixoff,i*3 + pixoff,3,3);
}
}
}
}
//中間插入logo
int width_4 = width / 4;
int width_8 = width_4 / 2;
int height_4 = height / 4;
int height_8 = height_4 / 2;
String logoPath = request.getSession().getServletContext().getRealPath("resources")+File.separator+"applogo.png";
Image img = ImageIO.read(new File(logoPath));
gs.drawImage(img, width_4 + width_8, height_4 + height_8,width_4,height_4, null);
gs.dispose();
bufferedImage.flush();
ImageIO.write(bufferedImage, "png", new File(path));
}以下是前臺發起請求下載二維碼圖片
@RequestMapping(value="bpm/bmfw/downloadEwm",method=RequestMethod.GET)
public void downloadEwm(HttpServletResponse response,HttpServletRequest request,@RequestParam("fileName")String fileName){
String p = request.getSession().getServletContext().getRealPath("resources")+File.separator+fileName;
System.out.println("輸入路徑: "+p);
File file = new File(p);
// 建立檔案輸入流
try {
//設定頭資訊,內容處理的方式,attachment以附件的形式開啟,就是進行下載,並設定下載檔案的命名
response.setHeader("Content-Disposition","attachment;filename="+URLEncoder.encode(file.getName(), "UTF-8"));
FileInputStream is = new FileInputStream(file);
// 響應輸出流
ServletOutputStream out = response.getOutputStream();
// 建立緩衝區
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1) {
out.write(buffer, 0, len);
}
is.close();
out.flush();
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}附上完整的Controller
package com.eazytec.bmfw.controller;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.http.client.utils.URLEncodedUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import com.eazytec.webapp.controller.BaseFormController;
import com.swetake.util.Qrcode;
@Controller
public class EwmController extends BaseFormController{
@RequestMapping(value="bpm/bmfw/printEwm",method=RequestMethod.POST)
public @ResponseBody String printEwm(@RequestParam("lcname") String lcname,@RequestParam("bjh") String bjh,@RequestParam("sx") String sx,
@RequestParam("sqr") String sqr,@RequestParam("lxdh") String lxdh,@RequestParam("sfzhm") String sfzhm,@RequestParam("sqsj") String sqsj,
HttpServletResponse response,HttpServletRequest request) throws UnsupportedEncodingException{
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日");
String time = sdf.format(date);
/*System.out.println(time);*/
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyyMMddHHmmssSS");
String picTime = sdf2.format(date);
String url = "\n許可證號:"+bjh+"\n申請人/單位:"+sqr+"\n統一社會信用程式碼/身份證號碼:"+sfzhm+"\n許可事項:"+sx+"\n聯絡電話:"+lxdh+"\n發證機關:丁蜀鎮便民服務中心"+"\n申請時間:"+sqsj+"\n發證時間:"+time;
String path = request.getSession().getServletContext().getRealPath("resources")+File.separator+"申請單資訊二維碼"+picTime+".jpg";
try {
genQrcode(url, path,response,request);
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("二維碼生成完畢");
String result = "bpm/bmfw/downloadEwm?fileName=";
return result+URLEncoder.encode("申請單資訊二維碼"+picTime+".jpg", "utf-8");
}
/**
* 生成二維碼
* @param url 二維碼的url文字內容
* @param path 要存放二維碼的路徑
* @throws IOException
*/
public void genQrcode(String url,String path,HttpServletResponse response,HttpServletRequest request) throws IOException{
Qrcode x=new Qrcode();
x.setQrcodeErrorCorrect('M');//糾錯等級（四種等級）
x.setQrcodeEncodeMode('B');//N代表數字，A代表a-Z,B代表其他字元
x.setQrcodeVersion(20);//版本 ,版本越大，容納的位元組數越多
/*int width = 67 + 12 * (7 - 1);//設定二維碼的大小公式：67 + 12 * （version - 1）
int height = 67 + 12 * (7 - 1); */
int width = 300;//設定二維碼的大小公式：67 + 12 * （version - 1）
int height = 300;
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D gs = bufferedImage.createGraphics();
gs.setBackground(Color.WHITE);
gs.setColor(Color.BLACK);
gs.clearRect(0, 0, width, height);//清除畫板的內容
int pixoff = 2;//新增一個偏移量
byte[] d = url.getBytes("utf-8");
System.out.println(d.length);
if (d.length>0 && d.length <500){
boolean[][] s = x.calQrcode(d);
for (int i=0;i<s.length;i++){
for (int j=0;j<s.length;j++){
if (s[j][i]) {
gs.fillRect(j*3 + pixoff,i*3 + pixoff,3,3);
}
}
}
}
//中間插入logo
int width_4 = width / 4;
int width_8 = width_4 / 2;
int height_4 = height / 4;
int height_8 = height_4 / 2;
String logoPath = request.getSession().getServletContext().getRealPath("resources")+File.separator+"applogo.png";
Image img = ImageIO.read(new File(logoPath));
gs.drawImage(img, width_4 + width_8, height_4 + height_8,width_4,height_4, null);
gs.dispose();
bufferedImage.flush();
ImageIO.write(bufferedImage, "png", new File(path));
}
@RequestMapping(value="bpm/bmfw/downloadEwm",method=RequestMethod.GET)
public void downloadEwm(HttpServletResponse response,HttpServletRequest request,@RequestParam("fileName")String fileName){
String p = request.getSession().getServletContext().getRealPath("resources")+File.separator+fileName;
System.out.println("輸入路徑: "+p);
File file = new File(p);
// 建立檔案輸入流
try {
//設定頭資訊,內容處理的方式,attachment以附件的形式開啟,就是進行下載,並設定下載檔案的命名
response.setHeader("Content-Disposition","attachment;filename="+URLEncoder.encode(file.getName(), "UTF-8"));
FileInputStream is = new FileInputStream(file);
// 響應輸出流
ServletOutputStream out = response.getOutputStream();
// 建立緩衝區
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1) {
out.write(buffer, 0, len);
}
is.close();
out.flush();
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}