java中springboot将html网页生成PDF文件的方法分享
下文笔者讲述html网页生成pdf的方法分享,如下所示
SpringBoot框架实现HTML转PDF
pdf简介
PDF是可移植文档格式
是一种电子文件格式
PDF文件格式可以将文字、字型、格式、颜色及独立于设备和分辨率的图形图像等放入一个文件中
pdf文件包含超文本链接、声音和动态影像等电子信息
支持特长文件,集成度和安全可靠性都较高
在日常开发中,我们经常使用pdf文件作为合同文件打印
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实现思路：
1.引入相应的jar包
2.生成相应的html文件
3.输出相应的pdf文件
例:SpringBoot框架实现HTML转PDF
引入jar包依赖
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.5.13.2</version>
</dependency>
<dependency>
<groupId>com.itextpdf.tool</groupId>
<artifactId>xmlworker</artifactId>
<version>5.5.13.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>
创建html模板pdftest_template
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8"/>
<title>Title</title>
<style>
body{font-family:SimSun;}
.title{align-content: center;text-align: center;}
.signature{float:right }
</style>
</head>
<body>
<div>
<h1 class="title">pdfTest</h1>
<h4 class="title"> </h4>
<span>当前时间: ${date_time} </span>
<div class="signature">日期：${date}</div>
</div>
</body>
</html>
例
import com.itextpdf.text.Document; import com.itextpdf.text.pdf.PdfWriter; import com.itextpdf.tool.xml.XMLWorkerHelper; import freemarker.template.Configuration; import freemarker.template.Template; import java.io.*; import java.net.URL; import java.nio.charset.Charset; import java.time.LocalDateTime; import java.time.format.DateTimeFormatter; import java.util.HashMap; import java.util.Map; public class PdfUtilTest { /** * 获取模板内容 * @param templateDirectory 模板文件夹 * @param templateName 模板文件名 * @param paramMap 模板参数 * @return * @throws Exception */ private static String getTemplateContent(String templateDirectory, String templateName, Map<String, Object> paramMap) throws Exception { Configuration configuration = new Configuration(Configuration.DEFAULT_INCOMPATIBLE_IMPROVEMENTS); try { configuration.setDirectoryForTemplateLoading(new File(templateDirectory)); } catch (Exception e) { System.out.println("-- exception --"); } Writer out = new StringWriter(); Template template = configuration.getTemplate(templateName,"UTF-8"); template.process(paramMap, out); out.flush(); out.close(); return out.toString(); } public static void main(String[] args) throws Exception { Map<String, Object> paramMap = new HashMap<>(); DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"); paramMap.put("date_time", dateTimeFormatter.format(LocalDateTime.now())); paramMap.put("date", dateTimeFormatter.format(LocalDateTime.now()).substring(0, 10)); //获取html文件路径 ClassLoader classLoader = PdfUtilTest.class.getClassLoader(); URL resource = classLoader.getResource("templates"); String templateDirectory =resource.toURI().getPath(); String templateContent = PdfUtilTest.getTemplateContent(templateDirectory, "pdftest_template.html", paramMap); System.out.println(templateContent); } }
生成PDF文档
public static boolean html2Pdf(String content, String outPath) {
try {
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(outPath));
document.open();
XMLWorkerHelper.getInstance().parseXHtml(writer, document,
new ByteArrayInputStream(content.getBytes()), null, Charset.forName("UTF-8"));
document.close();
} catch (Exception e) {
System.out.println("生成模板内容失败"+e.fillInStackTrace());
return false;
}
return true;
}
/**
* HTML 转 PDF
* @param content html内容
* @return PDF字节数组
*/
public static byte[] html2Pdf(String content) {
ByteArrayOutputStream outputStream = null;
try {
Document document = new Document();
outputStream = new ByteArrayOutputStream();
PdfWriter writer = PdfWriter.getInstance(document, outputStream);
document.open();
XMLWorkerHelper.getInstance().parseXHtml(writer, document,
new ByteArrayInputStream(content.getBytes()), null, Charset.forName("UTF-8"));
document.close();
} catch (Exception e) {
System.out.println("------生成pdf失败-------");
}
return outputStream.toByteArray();
}
public static void main(String[] args) throws Exception {
Map<String, Object> paramMap = new HashMap<>();
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
paramMap.put("date_time", dateTimeFormatter.format(LocalDateTime.now()));
paramMap.put("date", dateTimeFormatter.format(LocalDateTime.now()).substring(0, 10));
String outPath = "D:\\Test.pdf";
String templateDirectory = "D:\\";
String templateContent = PdfUtilTest.getTemplateContent(templateDirectory, "pdftest_template.html", paramMap);
PdfUtilTest.html2Pdf(templateContent, outPath);
}
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