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SpreadJS 导出PDF是一个强大的功能,解决了很多用户的实际问题,但是在导出PDF时有些问题始终困扰着很多开发者,例如排版、字体乱码等问题。
有很多刚接触SpreadJS的朋友就会对导出pdf乱码以及要注册中文字体这个问题非常不解。这是PDF文件的特殊性造成的。PDF是Portable Document Format的简称,意为“便携式文档格式”,它原生仅仅带有英文字体,不包含任何中文字体,因此当导出的内容中含有中文字体编码时,一定会显示乱码,所以通常情况下,我们都需要为PDF进行字体注册操作。
链接:https://pan.baidu.com/s/1Cw33CHC-aE9YmGyhLBlYlw 密码:sq4v
注意,整个工程需要部署到服务器来运行,否则可能因为跨域问题访问不到字体文件。
部署方法:https://blog.csdn.net/u014255803/article/details/73832072
注册分为服务器端注册和前端注册。
确认我们的表单需要用到哪些字体
去找对应字体的ttf文件(电脑上或者是一些字体网站上都有,需注意版权问题)。
找到之后将其转为base64格式的文件。具体如何转,可以找一些在线的文件转换器,不过在线的有可能会因为字体文件太大而崩溃,或者有能力的大佬可以自己写一个转换的工具。然后通过下面的方式去把我们的字体文件存储为一个js文件去等待引用。
将字体的ttf文件转为base64编码后通过js引入来导入,下面代码中 fontsObj["simkai.ttf"]就是对应的ttf字体base64编码
function registerCustomFont(fontsObj) {
var fonts = {
normal: fontsObj["simkai.ttf"]
};
GC.Spread.Sheets.PDF.PDFFontsManager.registerFont('simkai', fonts);
}
由于字体文件通常比较大,而前端注册字体的方法要求在页面加载时就要加载进来,这会导致前端加载时间长,影响性能。而且字体文件的base64编码通常也需要事先生成,这给开发同学们带来了不小的麻烦。
后台字体文件注册可以解决这些问题,字体文件在服务器上存储,只有当需要导出PDF时才执行加载操作。
代码如下,serverPath为服务器端指定PDF字体位置:
function registerServerFont(name, type, serverPath) {
var xhr = new XMLHttpRequest();
xhr.open('GET', serverPath, true);
xhr.responseType = 'blob';
xhr.onload = function (e) {
if (this.status == 200) {
// get binary data as a response
var blob = this.response;
//将Blob 对象转换成 ArrayBuffer
var reader = new FileReader();
reader.onload = function (e) {
var fontrrayBuffer = reader.result;
var fonts = GC.Spread.Sheets.PDF.PDFFontsManager.getFont(name) || {};
fonts[type] = fontrrayBuffer;
GC.Spread.Sheets.PDF.PDFFontsManager.registerFont(name, fonts);
}
reader.readAsArrayBuffer(blob);
}
};
xhr.send();
}
OK,熟悉Ajax的同学就明白了这里实际上采用了XMLHttpRequest对象的数据流读取了blob格式的字体文件,然后把这个流直接注册到PDFFontsManager中,实现了字体注册操作。
调用方法很简单,如下:
registerServerFont('微软雅黑', 'normal', 'font/msyh.ttf');
第一个参数对应了PDF中的字体名称,最后一个参数指定了字体文件的相对路径。
如果设置的字体在后台字体库中没有怎么办?其实解决方法也很简单,我们的客户需要的首先应该是一个能够阅读的PDF文件,当服务器端没有对应的字体文件时,可以指定别的字体库来代替,例如:
registerServerFont('Times New Roman', 'normal', 'font/simsun.ttf');
作者: Grapecity.China | 审核:Ellia.Duan | 更新时间:2023.12.13