Java实现二维码生成的代码方法

1、支持qrcode、zxing 二维码生成、解析；

2、qrcode 方式生成二维码支持添加图片，如下：

package common;

import java.awt.color;
import java.awt.graphics2d;
import java.awt.image;
import java.awt.image.bufferedimage;
import java.io.file;
import java.io.ioexception;
import java.util.hashmap;
import java.util.map;

import javax.imageio.imageio;

import jp.sourceforge.qrcode.qrcodedecoder;
import jp.sourceforge.qrcode.exception.decodingfailedexception;

import com.google.zxing.barcodeformat;
import com.google.zxing.binarizer;
import com.google.zxing.binarybitmap;
import com.google.zxing.encodehinttype;
import com.google.zxing.luminancesource;
import com.google.zxing.multiformatreader;
import com.google.zxing.multiformatwriter;
import com.google.zxing.notfoundexception;
import com.google.zxing.writerexception;
import com.google.zxing.common.bitmatrix;
import com.google.zxing.common.hybridbinarizer;
import com.swetake.util.qrcode;

/**
 * 二维码生成工具类
 * @author cloud
 * @data 2016-12-15
 * qrcode
 */

public class qrcodeutil {

 //二维码颜色
 private static final int black = 0xff000000;
 //二维码颜色
 private static final int white = 0xffffffff;

 /**
  * <span style="font-size:18px;font-weight:blod;">zxing 方式生成二维码</span>
  * @param text <a href="javascript:void();" rel="external nofollow" >二维码内容</a>
  * @param width 二维码宽
  * @param height 二维码高
  * @param outputpath 二维码生成保存路径
  * @param imagetype  二维码生成格式
  */
 public static void zxingcodecreate(string text, int width, int height, string outputpath, string imagetype){
  map<encodehinttype, string> his = new hashmap<encodehinttype, string>();
  //设置编码字符集
  his.put(encodehinttype.character_set, "utf-8");
  try {
   //1、生成二维码
   bitmatrix encode = new multiformatwriter().encode(text, barcodeformat.qr_code, width, height, his);

   //2、获取二维码宽高
   int codewidth = encode.getwidth();
   int codeheight = encode.getheight();

   //3、将二维码放入缓冲流
   bufferedimage image = new bufferedimage(codewidth, codeheight, bufferedimage.type_int_rgb);
   for (int i = 0; i < codewidth; i++) {
    for (int j = 0; j < codeheight; j++) {
     //4、循环将二维码内容定入图片
     image.setrgb(i, j, encode.get(i, j) ? black : white);
    }
   }
   file outputimage = new file(outputpath);
   //如果图片不存在创建图片
   if(!outputimage.exists())
    outputimage.createnewfile();
   //5、将二维码写入图片
   imageio.write(image, imagetype, outputimage);
  } catch (writerexception e) {
   e.printstacktrace();
   system.out.println("二维码生成失败");
  } catch (ioexception e) {
   e.printstacktrace();
   system.out.println("生成二维码图片失败");
  }
 }

 /**
  * <span style="font-size:18px;font-weight:blod;">二维码解析</span>
  * @param analyzepath 二维码路径
  * @return
  * @throws ioexception
  */
 @suppresswarnings({ "rawtypes", "unchecked" })
 public static object zxingcodeanalyze(string analyzepath) throws exception{
  multiformatreader formatreader = new multiformatreader();
  object result = null;
  try {
   file file = new file(analyzepath);
   if (!file.exists())
   {
    return "二维码不存在";
   }
   bufferedimage image = imageio.read(file);
   luminancesource source = new luminancesourceutil(image);
   binarizer binarizer = new hybridbinarizer(source);
   binarybitmap binarybitmap = new binarybitmap(binarizer);
   map hints = new hashmap();
   hints.put(encodehinttype.character_set, "utf-8");
   result = formatreader.decode(binarybitmap, hints);
  } catch (notfoundexception e) {
   e.printstacktrace();
  }
  return result;
 }

 /**
  * <span style="font-size:18px;font-weight:blod;">qrcode 方式生成二维码</span>
  * @param content 二维码内容
  * @param imgpath 二维码生成路径
  * @param version 二维码版本
  * @param isflag 是否生成logo图片 为null不生成
  */
 public static void qrcodecreate(string content, string imgpath, int version, string logopath){
   try {
   qrcode qrcodehandler = new qrcode();
   //设置二维码排错率，可选l(7%) m(15%) q(25%) h(30%)，排错率越高可存储的信息越少，但对二维码清晰度的要求越小
   qrcodehandler.setqrcodeerrorcorrect('m');
   //n代表数字,a代表字符a-z,b代表其他字符
   qrcodehandler.setqrcodeencodemode('b');
   //版本1为21*21矩阵，版本每增1，二维码的两个边长都增4；所以版本7为45*45的矩阵；最高版本为是40，是177*177的矩阵
   qrcodehandler.setqrcodeversion(version);
   //根据版本计算尺寸
   int imgsize = 67 + 12 * (version - 1) ;
   byte[] contentbytes = content.getbytes("gb2312");
   bufferedimage bufimg = new bufferedimage(imgsize , imgsize ,bufferedimage.type_int_rgb);
   graphics2d gs = bufimg.creategraphics();
   gs.setbackground(color.white);
   gs.clearrect(0, 0, imgsize , imgsize);
   // 设定图像颜色 > black
   gs.setcolor(color.black);
   // 设置偏移量 不设置可能导致解析出错
   int pixoff = 2;
   // 输出内容 > 二维码
   if (contentbytes.length > 0 && contentbytes.length < 130) {
    boolean[][] codeout = qrcodehandler.calqrcode(contentbytes);
    for (int i = 0; i < codeout.length; i++) {
     for (int j = 0; j < codeout.length; j++) {
      if (codeout[j][i]) {
       gs.fillrect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
      }
     }
    }
   } else {
    system.err.println("qrcode content bytes length = " + contentbytes.length + " not in [ 0,130 ]. ");
   }
   /* 判断是否需要添加logo图片 */
   if(logopath != null){
    file icon = new file(logopath);
    if(icon.exists()){
     int width_4 = imgsize / 4;
     int width_8 = width_4 / 2;
     int height_4 = imgsize / 4;
     int height_8 = height_4 / 2;
     image img = imageio.read(icon);
     gs.drawimage(img, width_4 + width_8, height_4 + height_8,width_4,height_4, null);
     gs.dispose();
     bufimg.flush();
    }else{
     system.out.println("error: login图片不存在！");
    }

   }


   gs.dispose();
   bufimg.flush();
   //创建二维码文件
   file imgfile = new file(imgpath);
   if(!imgfile.exists())
    imgfile.createnewfile();
   //根据生成图片获取图片
   string imgtype = imgpath.substring(imgpath.lastindexof(".") + 1, imgpath.length());
   // 生成二维码qrcode图片
   imageio.write(bufimg, imgtype, imgfile);
   } catch (exception e) {
    e.printstacktrace();
   }
 }

 /**
  * <span style="font-size:18px;font-weight:blod;">qrcode二维码解析</span>
  * @param codepath 二维码路径
  * @return 解析结果
  */
 public static string qrcodeanalyze(string codepath) {
  file imagefile = new file(codepath);
  bufferedimage bufimg = null;
  string decodeddata = null;
  try {
   if(!imagefile.exists())
    return "二维码不存在";
   bufimg = imageio.read(imagefile);

   qrcodedecoder decoder = new qrcodedecoder();
   decodeddata = new string(decoder.decode(new imageutil(bufimg)), "gb2312");
  } catch (ioexception e) {
   system.out.println("error: " + e.getmessage());
   e.printstacktrace();
  } catch (decodingfailedexception dfe) {
   system.out.println("error: " + dfe.getmessage());
   dfe.printstacktrace();
  }
  return decodeddata;
 }

}


3、最后贴测试代码：

package test;

import java.awt.image.bufferedimage;
import java.io.inputstream;
import java.net.url;

import javax.imageio.imageio;

import common.imageutil;
import common.qrcodeutil;

import jp.sourceforge.qrcode.qrcodedecoder;

/**
 * 二维码生成测试类
 * @author cloud
 * @data 2016-11-21
 * qrcodetest
 */

public class qrcodetest {

 public static void main(string[] args) throws exception {
  /**
   * qrcode 二维码生成测试
   * qrcodeutil.qrcodecreate("http://blog.csdn.net/u014266877", "e://qrcode.jpg", 15, "e://icon.png");
   */
  /**
   *  qrcode 二维码解析测试
   * string qrcodeanalyze = qrcodeutil.qrcodeanalyze("e://qrcode.jpg");
   */
  /**
   * zxingcode 二维码生成测试
   * qrcodeutil.zxingcodecreate("http://blog.csdn.net/u014266877", 300, 300, "e://zxingcode.jpg", "jpg");
   */
  /**
   * zxingcode 二维码解析
   * string zxinganalyze = qrcodeutil.zxingcodeanalyze("e://zxingcode.jpg").tostring();
   */
  system.out.println("success");
 }
}

原文链接：https://blog.csdn.net/u014266877/article/details/53665729