使用xhtmlrenderer将html转成图片
1、pom.xml新增xhtmlrenderer依赖
<dependency>
<groupId>org.xhtmlrenderer</groupId>
<artifactId>core-renderer</artifactId>
<version>R8</version>
</dependency>
2、模板 template.xhtml 一定要是标准的HTML，否则会报错
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head lang="en">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></meta>
</head>
<body style="font-family:SimSun;">
...
</body>
</html>
3、核心代码
int width = 600, height = 800;
File template = new File("xxx/template.xhtml");
Java2DRenderer renderer = new Java2DRenderer(template, width, height);
// 自动装载字体..
// 这样就不需要服务器安装字体了..(跳过第4步..
AWTFontResolver fontResolver = (AWTFontResolver) renderer.getSharedContext().getFontResolver();
fontResolver.setFontMapping(FontEnums.SIMSUN.getName(), FontEnums.SIMSUN.getFont());
BufferedImage image = renderer.getImage();
FSImageWriter imageWriter = new FSImageWriter();
imageWriter.write(img, "xxx/xxx.png");
4、Linux服务器缺乏中文字库，导致中文乱码
// 4.1 查看系统字体..
fc-list
// fc-list:command not found...
// 说明没有安装字体库..
// 4.2 安装字体库..
yum -y install fontconfig
// 4.3 将字体.ttf文件拷贝到/usr/share/fonts/文件夹下
// 4.5 重启服务器
5、将字体.ttf文件拷贝到/resources/资源文件下，自动装载字体，部署环境时，就不用操心字体了
public enum FontEnums {
SIMSUN("SimSun", "simsun.ttf"),
;
private String name;
private String path;
private Font font;
FontEnums(String name, String path) {
this.name = name;
this.path = path;
}
public String getName() {
return this.name;
}
public Font getFont() {
if (null == font) {
InputStream is = null;
BufferedInputStream bis = null;
try {
is = Resources.getResourceAsStream(path);
bis = new BufferedInputStream(is);
// 可能会报 "java.awt.FontFormatException: bad table, tag=23592960" 错误..
font = Font.createFont(Font.TRUETYPE_FONT, bis);
} catch (Exception e) {
} finally {
try {
if (bis != null) {
bis.close();
}
} catch (Exception e) {
}
try {
if (is != null) {
is.close();
}
} catch (Exception e) {
}
}
}
}
}
6、解决 “java.awt.FontFormatException: bad table, tag=23592960” 问题
发现本地运行时与使用maven打包之后的ttf文件大小不一致
以下摘自maven文档
Warning: Do not filter files with binary content like images! This will most likely result in corrupt output.
警告:不要过滤含有二进制内容的文件，如图像！这很可能导致输出损坏。
If you have both text files and binary files as resources it is recommended to have two separated folders. One folder src/main/resources (default) for the resources which are not filtered and another folder src/main/resources-filtered for the resources which are filtered.
如果您同时拥有文本文件和二进制文件作为资源，建议使用两个独立的文件夹。一个文件夹src/main/resources(默认)用于未过滤的资源，另一个文件夹src/main/resources-filtered用于已过滤的资源。
在pom.xml文件中，添加maven-resources-plugin插件，通过nonFilteredFileExtension过滤后缀为ttf的文件
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.6</version>
<configuration>
<encoding>UTF-8</encoding>
<nonFilteredFileExtensions>
<nonFilteredFileExtension>ttf</nonFilteredFileExtension>
</nonFilteredFileExtensions>
</configuration>
</plugin>