1.海报显示的速度比较慢。
原因：图片过大。
解决：在数据库中增加字段，存压缩后的图片。在上传图片的时候，对图片进行压缩处理，存两份，一份原图，一份压缩图。
显示图片列表的时候查询压缩图，查看详情的时候，去查原图。
压缩图片的工具类：
import java.awt.Image;import java.awt.image.BufferedImage;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.Iterator;import javax.imageio.IIOImage;import javax.imageio.ImageIO;import javax.imageio.ImageWriteParam;import javax.imageio.ImageWriter;/** * ?* @ClassName: ImageBiz * @Description:压缩图片方法 */public class ImageBizUtil { ???/** ????* ?????* @Title: imageZip ????* @Description: 根据分辨率压缩图片 ????* @param oldByte 源图片字节 ????* @param width 压缩图片的宽 ????* @param height 压缩图片的高 ????* @return ????* @throws IOException ????* @return: byte[] ????* @throws ????*/ ???public static byte[] imageZip(byte[] oldByte, int width, int height) throws IOException { ???????ByteArrayOutputStream os = null; ???????InputStream inputStream = null; ???????try { ???????????inputStream = new ByteArrayInputStream(oldByte); ???????????// 用系统缓存 ???????????ImageIO.setUseCache(false); ???????????// 或者设定一个缓存路径 ???????????// ImageIO.setCacheDirectory(File cacheDirectory); ???????????BufferedImage image = ImageIO.read(inputStream); ???????????// 为等比缩放计算输出的图片宽度及高度 ???????????int imageWidth = image.getWidth(null); ???????????int imageHeight = image.getHeight(null); ???????????float ratio = getRatio(imageWidth, imageHeight, width, height); ???????????int newWidth = (int) (ratio * imageWidth); ???????????int newHeight = (int) (ratio * imageHeight); ???????????BufferedImage newBufferedImage = ???????????????????new BufferedImage((int) newWidth, (int) newHeight, BufferedImage.TYPE_INT_RGB); ???????????newBufferedImage.getGraphics().drawImage( ???????????????????image.getScaledInstance(newWidth, newHeight, Image.SCALE_SMOOTH), 0, 0, null); ???????????Iterator<ImageWriter> iter = ImageIO.getImageWritersByFormatName("jpeg"); ???????????ImageWriter imageWriter = iter.next(); ???????????ImageWriteParam iwp = imageWriter.getDefaultWriteParam(); ???????????iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT); ???????????os = new ByteArrayOutputStream(oldByte.length); ???????????imageWriter.setOutput(ImageIO.createImageOutputStream(os)); ???????????IIOImage iio_image = new IIOImage(newBufferedImage, null, null); ???????????imageWriter.write(null, iio_image, iwp); ???????????os.flush(); ???????????byte[] newBytes = os.toByteArray(); ???????????return newBytes; ???????} catch (IOException e) { ???????????throw e; ???????} finally { ???????????if (os != null) { ???????????????os.close(); ???????????} ???????????if (inputStream != null) { ???????????????inputStream.close(); ???????????} ???????} ???} ???/** ????* ?????* @Title: getRatio ????* @Description: 压缩比例算法 ????* @param imageWidth 原图片宽 ????* @param imageHeight 原图片高 ????* @param width 压缩后的图片宽 ????* @param height 压缩后的图片高 ????* @return ????* @return: float ????*/ ???public static float getRatio(int imageWidth, int imageHeight, int width, int height) { ???????float Ratio = 1.0f; ???????float widthRatio = (float) width / imageWidth; ???????float heightRatio = (float) height / imageHeight; ???????if (widthRatio < 1.0 || heightRatio < 1.0) { ???????????Ratio = widthRatio <= heightRatio ? widthRatio : heightRatio; ???????} ???????return Ratio; ???}}核心代码：
//海报上传 ?public BaseResult uploadPosterInfomation(List<GoPhosterInfomationPo> list){ ???????//创建返参对象 ???BaseResult baseResult = new BaseResult(); ???????????for (int i = 0; i < list.size(); i++) { ???????????if (StringUtils.isBlank(list.get(i).getTypeCode())) { ???????baseResult.setRet(BaseResult.BIZ_ERROR); ???????baseResult.setMsg("请录入海报类型"); ???????return baseResult; ?????} ???????????if (StringUtils.isBlank(list.get(i).getPhosterImage())) { ???????baseResult.setRet(BaseResult.BIZ_ERROR); ???????baseResult.setMsg("请选择要保存的海报模板"); ???????return baseResult; ?????} ???????????//设置海报唯一标识 ?????list.get(i).setPhosterId(UUIDUtil.genUUID2()); ???????????//设置海报序号 ?????Integer maxNum = posterMakeFunctionMapper.queryMaxNum(); ?????if (maxNum == null || maxNum == 0) { ???????list.get(i).setOrderNumber(1); ?????}else{ ???????list.get(i).setOrderNumber(maxNum+1); ?????} ???????//将base64图片转为二进制 ?????byte[] imgByt = ImageUtil.getImageByte(list.get(i).getPhosterImage()); ?????byte[] imgZip = null;//压缩之后的图片 ?????try { ?????????imgZip = ImageBizUtil.imageZip(imgByt, 200, 200); ?????} catch (IOException e) { ?????????e.printStackTrace(); ?????} ?????String imgStr = ImageUtil.getImageStr(imgZip); ??????????list.get(i).setPhosterImageZip("data:image/png;base64,"+imgStr); ???????????//保存海报 ?????posterMakeFunctionMapper.uploadPosterInfomation(list.get(i)); ?????????}2.在制作海报的时候，设置微软雅黑字体，在本地测试，生成的海报上的字体是微软雅黑，但是在服务器上却显示宋体。
原因：服务器没有微软雅黑字体。
解决：
01.在服务器上安装微软雅黑字体
1.到windows环境下找到微软雅黑字体库，C:\Windows\Fonts。msyf.ttf（微软雅黑）)2.到linux环境下创建目录mkdir -pv /usr/share/fonts/chinese/TrueType使用rz命令，将字体放入目录下rz cd /usr/share/fonts/chinese/TrueTypechmod 755 * 为字体赋予可执行权限3.建立字体缓存# mkfontscale （如果提示 mkfontscale: command not found，需自行安装 # yum install mkfontscale ）# mkfontdir# fc-cache -fv （如果提示 fc-cache: command not found，则需要安装# yum install fontconfig ）4.reboot重启系统
02.将微软雅黑字体文件放在项目中
工作总结02（海报上传模块）
原文地址：https://www.cnblogs.com/lyb0103/p/9732586.html