private BufferedImage image;     private int imageWidth = 750;  //图片的宽度     private int imageHeight = 1350; //图片的高度     @Override     public String queryFindEntityGoodPictureDetail(Long id, Long groupId, Long memberId, String url) throws Exception {
          int H_title = 300;     //头部高度         int H_activity = 430;  //活动高度         int H_mainPic = 700;   //广告高度         int H_tip = 300;       //商品价格栏         int tip_2_top = (H_title+H_mainPic);         MallEntityGood mallEntityGood=mallEntityGoodMapper.queryFindEntityGoodPictureDetail(id,groupId);         image = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);         //设置图片的背景色         Graphics2D main = image.createGraphics();         main.setColor(Color.white);         main.fillRect(0, 0, imageWidth, imageHeight);         //***********************页面头部         Graphics title = image.createGraphics();         title.setColor(Color.BLACK);         // 设置字体         Font titleFont = new Font("宋体", Font.BOLD, 52);         title.setFont(titleFont);         // 如果商品名大于12个字符,截取12个字符在第一行中显示,剩余的在第二行显示         // 完成之后优化 考虑用户在使用英文的前提下 每行字数乘两倍         if(mallEntityGood.getName().length()>14) {
              String goodName1=mallEntityGood.getName().substring(0,14);             if(mallEntityGood.getName().length()>14 && mallEntityGood.getName().length()<27){
                  String goodName2=mallEntityGood.getName().substring(14);                 title.drawString(URLDecoder.decode(goodName2, "UTF-8"), 20, (H_title)/3+80);             }else if(mallEntityGood.getName().length()>27){
                  String goodName2=mallEntityGood.getName().substring(14,27);                 title.drawString(URLDecoder.decode(goodName2, "UTF-8")+"...", 20, (H_title)/3+80);             }             title.drawString(URLDecoder.decode(goodName1, "UTF-8"), 20, (H_title)/3+5);         }else {
              title.drawString(URLDecoder.decode(mallEntityGood.getName(), "UTF-8"), 20, (H_title)/3+5);         }         // 获取商品所参加的活动         // 标题之下(商品所属活动)         Graphics activity = image.createGraphics();         activity.setColor(Color.red);         Font activityFont = new Font("宋体", Font.BOLD, 38);         activity.setFont(activityFont);         String goodid=String.valueOf(id);         List
    
      activityUnroutineList = activityUnroutineMapper.queryActivityListById(goodid);         if(activityUnroutineList != null){
                  for (int i=0;i
     
      20){
                              activity.drawString( "活动:"+URLDecoder.decode(activityNames, "UTF-8").substring(0,21)+"...", 20, (H_activity)/2);                         }else {
                              activity.drawString( "活动:"+URLDecoder.decode(activityNames, "UTF-8"), 20, (H_activity)/2);                         }                         break;                     }                 }         }else{
              String activityName="";             activity.drawString( activityName, 20, (H_activity)/2);         }         //***********************插入中间广告图         Graphics mainPic = image.getGraphics();         BufferedImage bimg = null;         // 获取商品图片         if(mallEntityGood.getPicture()!=null) {
              String[] picture = mallEntityGood.getPicture().trim().split(",");             for(int i=0;i
      
       0){
                      bimg=ImageIO.read(new URL(picture[i]).openStream());                     mainPic.drawImage(bimg, 0, H_title, imageWidth, H_mainPic, null);                     mainPic.dispose();                     break;                 }             }         }         // 价格以及小图标的排布         Graphics2D tip = image.createGraphics();         tip.setColor(Color.red);         Font tipFont = new Font("宋体", Font.BOLD, 52);         tip.setFont(tipFont);         DecimalFormat df = new DecimalFormat(".00");         tip.drawString("¥"+ df.format(mallEntityGood.getPromotionPrice()/100), 300, tip_2_top+(H_tip)/2-40);         Font btnFont = new Font("宋体", Font.PLAIN, 26);         Graphics2D btn1 = image.createGraphics();         btn1.setColor(Color.red);         btn1.setFont(btnFont);         Graphics mainPic3 = image.getGraphics();         BufferedImage bimg3 = null;         String imgurl3="http://ebank007.oss-cn-hangzhou.aliyuncs.com/20180731173813D9PJ9Q.jpg";         bimg3=ImageIO.read(new URL(imgurl3).openStream());         int width = bimg3.getWidth();         int height = bimg3.getHeight();         mainPic3.drawImage(bimg3, 580, tip_2_top+(H_tip)/2-80, width, height, null);         mainPic3.dispose();         Font btnFont2 = new Font("宋体", Font.PLAIN, 36);         Graphics2D btn2 = image.createGraphics();         btn2.setColor(Color.black);         btn2.setFont(btnFont2);         String salePrice="原价";         btn2.drawString(URLDecoder.decode(salePrice, "UTF-8")+": ¥"+df.format(mallEntityGood.getSalePrice()/100), 300, tip_2_top+(H_tip)/2+30);         btn2.drawString("------------", 300, tip_2_top+(H_tip)/2+30);         // 确定二维码所在的位置         Graphics2D tip1 = image.createGraphics();         tip1.setColor(Color.black);         Font tipFont2 = new Font("宋体", Font.PLAIN, 28);         tip1.setFont(tipFont2);         String ccLog="长按识别二维码";         tip1.drawString("["+URLDecoder.decode(ccLog, "UTF-8")+"]", 35, tip_2_top+(H_tip)/2+180);         //  用户分享链接二维码         String shareGoodQRcode=url+"/api/oAuth2/goodDetailShare?gid="+id+"&"+"memberid="+memberId+"&"+"groupId="+groupId;         int qrcode_height=250;         int qrcode_width=250;         BufferedImage image = createImage1(shareGoodQRcode, qrcode_width, qrcode_height);         //  确定二维码在图中的位置         Graphics mainPic1 = this.image.getGraphics();         if(image!=null){
              mainPic1.drawImage(image, 20, tip_2_top+30, qrcode_width, qrcode_height, null);             mainPic1.dispose();         }         String  uuid = UUID.randomUUID().toString();         createImage(uuid+".png");         //   内存中文件存储的文件夹的位置      /* File dir=new File(uuid+".png");         File[] lst=dir.listFiles();         for (File f:lst){
              // 三天自动清除文件(失效处理)             if (new Date().getTime()-f.lastModified()>24*60*60*1000*3){
                  f.delete();             }         }*/         File dir=new File(uuid+".png");         if (new Date().getTime()-dir.lastModified()>24*60*60*1000*3){
              dir.delete();         }         InputStream in = null;         byte[] data = null;         //读取图片字节数组         try {
              in = new FileInputStream(uuid+".png");             data = new byte[in.available()];             in.read(data);             in.close();         } catch (IOException e) {
              e.printStackTrace();         }         //对字节数组Base64编码         BASE64Encoder encoder = new BASE64Encoder();         return encoder.encode(data); //返回Base64编码过的字节数组字符串 //        FileImageInputStream   input = new FileImageInputStream(new File("1.png")); //        ByteArrayOutputStream output = new ByteArrayOutputStream(); //        byte[] buf = new byte[1024]; //        int numBytesRead = 0; //        while ((numBytesRead = input.read(buf)) != -1) {
  //            output.write(buf, 0, numBytesRead); //        } //        byte[] data = output.toByteArray(); //        output.close(); //        input.close(); //        return data;     }     /**      * 二维码图片的生成      * @param content        链接      * @param qrcode_width    二维码宽      * @param qrcode_height       二维码高      * @return      * @throws Exception      */     public static BufferedImage createImage1(String content, int qrcode_width, int qrcode_height) throws Exception {
          Hashtable
       
         hints = new Hashtable
        
         ();         hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);         hints.put(EncodeHintType.CHARACTER_SET, "utf-8");         hints.put(EncodeHintType.MARGIN, 1);         BitMatrix bitMatrix = new MultiFormatWriter().encode(content,                 BarcodeFormat.QR_CODE, qrcode_width, qrcode_height, hints);         int width = bitMatrix.getWidth();         int height = bitMatrix.getHeight();         BufferedImage image = new BufferedImage(width, height,                 BufferedImage.TYPE_INT_RGB);         for (int x = 0; x < width; x++) {
              for (int y = 0; y < height; y++) {
                  image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000                         : 0xFFFFFFFF);             }         }         return image;     }     //生成图片文件     @SuppressWarnings("restriction")     public void createImage(String fileLocation) {
          BufferedOutputStream bos = null;         if(image != null) {
              try {
                  FileOutputStream fos = new FileOutputStream(fileLocation);                 bos = new BufferedOutputStream(fos);                 JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(bos);                 encoder.encode(image);                 fos.close();                 bos.close();             } catch (Exception e) {
                  e.printStackTrace();             } finally {
                  if (bos != null) {//关闭输出流                     try {
                          bos.close();                     } catch (IOException e) {
                          e.printStackTrace();                     }                 }             }         }     } 需要注意的是:后台数据合成的图片后  返回Base64 String时 前端微信显示会出现中文乱码 　　　　　　 这一点是因为,开发时window本地下,系统中含有宋体.楷体等资源,而在服务器上 　　　　　　 是没有这些字体的需要导入TTF相匹配的肢体文件,之后重启nginx中tomcat.    还有一点:后台代码中调用方法生成的图片,并不是保存到本地,还是服务器内存需要定时清除